com.itextpdf.kernel.pdf.canvas.PdfCanvas Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2023 Apryse Group NV
Authors: Apryse Software.
This program is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://itextpdf.com/sales. For AGPL licensing, see below.
AGPL licensing:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see gsStack = new Stack<>();
/**
* the current graphics state.
*/
protected CanvasGraphicsState currentGs = new CanvasGraphicsState();
/**
* the content stream for this canvas object.
*/
protected PdfStream contentStream;
/**
* the resources for the page that this canvas belongs to.
*
* @see PdfResources
*/
protected PdfResources resources;
/**
* the document that the resulting content stream of this canvas will be written to.
*/
protected PdfDocument document;
/**
* a counter variable for the marked content stack.
*/
protected int mcDepth;
/**
* The list where we save/restore the layer depth.
*/
protected List layerDepth;
/**
* Creates PdfCanvas from content stream of page, form XObject, pattern etc.
*
* @param contentStream The content stream
* @param resources The resources, a specialized dictionary that can be used by PDF instructions in the content stream
* @param document The document that the resulting content stream will be written to
*/
public PdfCanvas(PdfStream contentStream, PdfResources resources, PdfDocument document) {
this.contentStream = ensureStreamDataIsReadyToBeProcessed(contentStream);
this.resources = resources;
this.document = document;
}
/**
* Convenience method for fast PdfCanvas creation by a certain page.
*
* @param page page to create canvas from.
*/
public PdfCanvas(PdfPage page) {
this(page, (page.getDocument().getReader() != null && page.getDocument().getWriter() != null
&& page.getContentStreamCount() > 0 && page.getLastContentStream().getLength() > 0)
|| (page.getRotation() != 0 && page.isIgnorePageRotationForContent()));
}
/**
* Convenience method for fast PdfCanvas creation by a certain page.
*
* @param page page to create canvas from.
* @param wrapOldContent true to wrap all old content streams into q/Q operators so that the state of old
* content streams would not affect the new one
*/
public PdfCanvas(PdfPage page, boolean wrapOldContent) {
this(getPageStream(page), page.getResources(), page.getDocument());
if (wrapOldContent) {
// Wrap old content in q/Q in order not to get unexpected results because of the CTM
page.newContentStreamBefore().getOutputStream().writeBytes(ByteUtils.getIsoBytes("q\n"));
contentStream.getOutputStream().writeBytes(ByteUtils.getIsoBytes("Q\n"));
}
if (page.getRotation() != 0 && page.isIgnorePageRotationForContent()
&& (wrapOldContent || !page.isPageRotationInverseMatrixWritten())) {
applyRotation(page);
page.setPageRotationInverseMatrixWritten();
}
}
/**
* Creates a PdfCanvas from a PdfFormXObject.
*
* @param xObj the PdfFormXObject used to create the PdfCanvas
* @param document the document to which the resulting content stream will be written
*/
public PdfCanvas(PdfFormXObject xObj, PdfDocument document) {
this(xObj.getPdfObject(), xObj.getResources(), document);
}
/**
* Convenience method for fast PdfCanvas creation by a certain page.
*
* @param doc The document
* @param pageNum The page number
*/
public PdfCanvas(PdfDocument doc, int pageNum) {
this(doc.getPage(pageNum));
}
/**
* Get the resources of the page that this canvas belongs to..
*
* @return PdfResources of the page that this canvas belongs to..
*/
public PdfResources getResources() {
return resources;
}
/**
* Get the document this canvas belongs to
*
* @return PdfDocument the document that this canvas belongs to
*/
public PdfDocument getDocument() {
return document;
}
/**
* Attaches new content stream to the canvas.
* This method is supposed to be used when you want to write in different PdfStream keeping context (gsStack, currentGs, ...) the same.
*
* @param contentStream a content stream to attach.
*/
public void attachContentStream(PdfStream contentStream) {
this.contentStream = contentStream;
}
/**
* Gets current {@link CanvasGraphicsState}.
*
* @return container containing properties for the current state of the canvas.
*/
public CanvasGraphicsState getGraphicsState() {
return currentGs;
}
/**
* Releases the canvas.
* Use this method after you finished working with canvas.
*/
public void release() {
gsStack = null;
currentGs = null;
contentStream = null;
resources = null;
}
/**
* Saves graphics state.
*
* @return current canvas.
*/
public PdfCanvas saveState() {
document.checkIsoConformance('q', IsoKey.CANVAS_STACK);
gsStack.push(currentGs);
currentGs = new CanvasGraphicsState(currentGs);
contentStream.getOutputStream().writeBytes(q);
return this;
}
/**
* Restores graphics state.
*
* @return current canvas.
*/
public PdfCanvas restoreState() {
document.checkIsoConformance('Q', IsoKey.CANVAS_STACK);
if (gsStack.isEmpty()) {
throw new PdfException(KernelExceptionMessageConstant.UNBALANCED_SAVE_RESTORE_STATE_OPERATORS);
}
currentGs = gsStack.pop();
contentStream.getOutputStream().writeBytes(Q);
return this;
}
/**
* Concatenates the 2x3 affine transformation matrix to the current matrix
* in the content stream managed by this Canvas.
* Contrast with {@link PdfCanvas#setTextMatrix}
*
* @param a operand 1,1 in the matrix.
* @param b operand 1,2 in the matrix.
* @param c operand 2,1 in the matrix.
* @param d operand 2,2 in the matrix.
* @param e operand 3,1 in the matrix.
* @param f operand 3,2 in the matrix.
* @return current canvas
*/
public PdfCanvas concatMatrix(double a, double b, double c, double d, double e, double f) {
currentGs.updateCtm((float) a, (float) b, (float) c, (float) d, (float) e, (float) f);
contentStream.getOutputStream().writeDouble(a).writeSpace().
writeDouble(b).writeSpace().
writeDouble(c).writeSpace().
writeDouble(d).writeSpace().
writeDouble(e).writeSpace().
writeDouble(f).writeSpace().writeBytes(cm);
return this;
}
/**
* Concatenates the 2x3 affine transformation matrix to the current matrix
* in the content stream managed by this Canvas.
* If an array not containing the 6 values of the matrix is passed,
* The current canvas is returned unchanged.
*
* @param array affine transformation stored as a PdfArray with 6 values
* @return current canvas
*/
public PdfCanvas concatMatrix(PdfArray array) {
if (array.size() != 6) {
//Throw exception or warning here
return this;
}
for (int i = 0; i < array.size(); i++) {
if (!array.get(i).isNumber()) {
return this;
}
}
return concatMatrix(array.getAsNumber(0).doubleValue(), array.getAsNumber(1).doubleValue(), array.getAsNumber(2).doubleValue(), array.getAsNumber(3).doubleValue(), array.getAsNumber(4).doubleValue(), array.getAsNumber(5).doubleValue());
}
/**
* Concatenates the affine transformation matrix to the current matrix
* in the content stream managed by this Canvas.
*
* @param transform affine transformation matrix to be concatenated to the current matrix
* @return current canvas
* @see #concatMatrix(double, double, double, double, double, double)
*/
public PdfCanvas concatMatrix(AffineTransform transform) {
float[] matrix = new float[6];
transform.getMatrix(matrix);
return concatMatrix(matrix[0], matrix[1], matrix[2], matrix[3], matrix[4], matrix[5]);
}
/**
* Begins text block (PDF BT operator).
*
* @return current canvas.
*/
public PdfCanvas beginText() {
contentStream.getOutputStream().writeBytes(BT);
return this;
}
/**
* Ends text block (PDF ET operator).
*
* @return current canvas.
*/
public PdfCanvas endText() {
contentStream.getOutputStream().writeBytes(ET);
return this;
}
/**
* Begins variable text block
*
* @return current canvas
*/
public PdfCanvas beginVariableText() {
return beginMarkedContent(PdfName.Tx);
}
/**
* Ends variable text block
*
* @return current canvas
*/
public PdfCanvas endVariableText() {
return endMarkedContent();
}
/**
* Sets font and size (PDF Tf operator).
*
* @param font The font
* @param size The font size.
* @return The edited canvas.
*/
public PdfCanvas setFontAndSize(PdfFont font, float size) {
currentGs.setFontSize(size);
PdfName fontName = resources.addFont(document, font);
currentGs.setFont(font);
contentStream.getOutputStream()
.write(fontName)
.writeSpace()
.writeFloat(size).writeSpace()
.writeBytes(Tf);
return this;
}
/**
* Moves text by shifting text line matrix (PDF Td operator).
*
* @param x x coordinate.
* @param y y coordinate.
* @return current canvas.
*/
public PdfCanvas moveText(double x, double y) {
contentStream.getOutputStream()
.writeDouble(x)
.writeSpace()
.writeDouble(y).writeSpace()
.writeBytes(Td);
return this;
}
/**
* Sets the text leading parameter.
*
* The leading parameter is measured in text space units. It specifies the vertical distance
* between the baselines of adjacent lines of text.
*
*
* @param leading the new leading.
* @return current canvas.
*/
public PdfCanvas setLeading(float leading) {
currentGs.setLeading(leading);
contentStream.getOutputStream()
.writeFloat(leading)
.writeSpace()
.writeBytes(TL);
return this;
}
/**
* Moves to the start of the next line, offset from the start of the current line.
*
* As a side effect, this sets the leading parameter in the text state.
*
*
* @param x offset of the new current point
* @param y y-coordinate of the new current point
* @return current canvas.
*/
public PdfCanvas moveTextWithLeading(float x, float y) {
currentGs.setLeading(-y);
contentStream.getOutputStream()
.writeFloat(x)
.writeSpace()
.writeFloat(y)
.writeSpace()
.writeBytes(TD);
return this;
}
/**
* Moves to the start of the next line.
*
* @return current canvas.
*/
public PdfCanvas newlineText() {
contentStream.getOutputStream()
.writeBytes(TStar);
return this;
}
/**
* Moves to the next line and shows {@code text}.
*
* @param text the text to write
* @return current canvas.
*/
public PdfCanvas newlineShowText(String text) {
checkDefaultDeviceGrayBlackColor(getColorKeyForText());
showTextInt(text);
contentStream.getOutputStream()
.writeByte('\'')
.writeNewLine();
return this;
}
/**
* Moves to the next line and shows text string, using the given values of the character and word spacing parameters.
*
* @param wordSpacing a parameter
* @param charSpacing a parameter
* @param text the text to write
* @return current canvas.
*/
public PdfCanvas newlineShowText(float wordSpacing, float charSpacing, String text) {
checkDefaultDeviceGrayBlackColor(getColorKeyForText());
contentStream.getOutputStream()
.writeFloat(wordSpacing)
.writeSpace()
.writeFloat(charSpacing);
showTextInt(text);
contentStream.getOutputStream()
.writeByte('"')
.writeNewLine();
// The " operator sets charSpace and wordSpace into graphics state
// (cfr PDF reference v1.6, table 5.6)
currentGs.setCharSpacing(charSpacing);
currentGs.setWordSpacing(wordSpacing);
return this;
}
/**
* Sets text rendering mode.
*
* @param textRenderingMode text rendering mode @see PdfCanvasConstants.
* @return current canvas.
*/
public PdfCanvas setTextRenderingMode(int textRenderingMode) {
currentGs.setTextRenderingMode(textRenderingMode);
contentStream.getOutputStream()
.writeInteger(textRenderingMode).writeSpace()
.writeBytes(Tr);
return this;
}
/**
* Sets the text rise parameter.
*
* This allows to write text in subscript or superscript mode.
*
*
* @param textRise a parameter
* @return current canvas.
*/
public PdfCanvas setTextRise(float textRise) {
currentGs.setTextRise(textRise);
contentStream.getOutputStream()
.writeFloat(textRise).writeSpace()
.writeBytes(Ts);
return this;
}
/**
* Sets the word spacing parameter.
*
* @param wordSpacing a parameter
* @return current canvas.
*/
public PdfCanvas setWordSpacing(float wordSpacing) {
currentGs.setWordSpacing(wordSpacing);
contentStream.getOutputStream()
.writeFloat(wordSpacing).writeSpace()
.writeBytes(Tw);
return this;
}
/**
* Sets the character spacing parameter.
*
* @param charSpacing a parameter
* @return current canvas.
*/
public PdfCanvas setCharacterSpacing(float charSpacing) {
currentGs.setCharSpacing(charSpacing);
contentStream.getOutputStream()
.writeFloat(charSpacing).writeSpace()
.writeBytes(Tc);
return this;
}
/**
* Sets the horizontal scaling parameter.
*
* @param scale a parameter.
* @return current canvas.
*/
public PdfCanvas setHorizontalScaling(float scale) {
currentGs.setHorizontalScaling(scale);
contentStream.getOutputStream()
.writeFloat(scale)
.writeSpace()
.writeBytes(Tz);
return this;
}
/**
* Replaces the text matrix. Contrast with {@link PdfCanvas#concatMatrix}
*
* @param a operand 1,1 in the matrix.
* @param b operand 1,2 in the matrix.
* @param c operand 2,1 in the matrix.
* @param d operand 2,2 in the matrix.
* @param x operand 3,1 in the matrix.
* @param y operand 3,2 in the matrix.
* @return current canvas.
*/
public PdfCanvas setTextMatrix(float a, float b, float c, float d, float x, float y) {
contentStream.getOutputStream()
.writeFloat(a)
.writeSpace()
.writeFloat(b)
.writeSpace()
.writeFloat(c)
.writeSpace()
.writeFloat(d)
.writeSpace()
.writeFloat(x)
.writeSpace()
.writeFloat(y).writeSpace()
.writeBytes(Tm);
return this;
}
/**
* Replaces the text matrix. Contrast with {@link PdfCanvas#concatMatrix}
*
* @param transform new textmatrix as transformation
* @return current canvas
*/
public PdfCanvas setTextMatrix(AffineTransform transform) {
float[] matrix = new float[6];
transform.getMatrix(matrix);
return setTextMatrix(matrix[0], matrix[1], matrix[2], matrix[3], matrix[4], matrix[5]);
}
/**
* Changes the text matrix.
*
* @param x operand 3,1 in the matrix.
* @param y operand 3,2 in the matrix.
* @return current canvas.
*/
public PdfCanvas setTextMatrix(float x, float y) {
return setTextMatrix(1, 0, 0, 1, x, y);
}
/**
* Shows text (operator Tj).
*
* @param text text to show.
* @return current canvas.
*/
public PdfCanvas showText(String text) {
checkDefaultDeviceGrayBlackColor(getColorKeyForText());
showTextInt(text);
contentStream.getOutputStream().writeBytes(Tj);
return this;
}
/**
* Shows text (operator Tj).
*
* @param text text to show.
* @return current canvas.
*/
public PdfCanvas showText(GlyphLine text) {
return showText(text, new ActualTextIterator(text));
}
/**
* Shows text (operator Tj).
*
* @param text text to show.
* @param iterator iterator over parts of the glyph line that should be wrapped into some marked content groups,
* e.g. /ActualText or /ReversedChars
* @return current canvas.
*/
public PdfCanvas showText(GlyphLine text, Iterator iterator) {
checkDefaultDeviceGrayBlackColor(getColorKeyForText());
document.checkIsoConformance(currentGs, IsoKey.FONT_GLYPHS, null, contentStream);
PdfFont font;
if ((font = currentGs.getFont()) == null) {
throw new PdfException(
KernelExceptionMessageConstant.FONT_AND_SIZE_MUST_BE_SET_BEFORE_WRITING_ANY_TEXT, currentGs);
}
document.checkIsoConformance(text.toString(), IsoKey.FONT, null, null, currentGs.getFont());
final float fontSize = FontProgram.convertTextSpaceToGlyphSpace(currentGs.getFontSize());
float charSpacing = currentGs.getCharSpacing();
float scaling = currentGs.getHorizontalScaling() / 100f;
List glyphLineParts = iteratorToList(iterator);
for (int partIndex = 0; partIndex < glyphLineParts.size(); ++partIndex) {
GlyphLine.GlyphLinePart glyphLinePart = glyphLineParts.get(partIndex);
if (glyphLinePart.actualText != null) {
PdfDictionary properties = new PdfDictionary();
properties.put(PdfName.ActualText, new PdfString(glyphLinePart.actualText, PdfEncodings.UNICODE_BIG).setHexWriting(true));
beginMarkedContent(PdfName.Span, properties);
} else if (glyphLinePart.reversed) {
beginMarkedContent(PdfName.ReversedChars);
}
int sub = glyphLinePart.start;
for (int i = glyphLinePart.start; i < glyphLinePart.end; i++) {
Glyph glyph = text.get(i);
if (glyph.hasOffsets()) {
if (i - 1 - sub >= 0) {
font.writeText(text, sub, i - 1, contentStream.getOutputStream());
contentStream.getOutputStream().writeBytes(Tj);
contentStream.getOutputStream()
.writeFloat(getSubrangeWidth(text, sub, i - 1), true)
.writeSpace()
.writeFloat(0)
.writeSpace()
.writeBytes(Td);
}
float xPlacement = Float.NaN;
float yPlacement = Float.NaN;
if (glyph.hasPlacement()) {
{
float xPlacementAddition = 0;
int currentGlyphIndex = i;
Glyph currentGlyph = text.get(i);
// if xPlacement is not zero, anchorDelta is expected to be non-zero as well
while (currentGlyph != null && (currentGlyph.getAnchorDelta() != 0)) {
xPlacementAddition += currentGlyph.getXPlacement();
if (currentGlyph.getAnchorDelta() == 0) {
break;
} else {
currentGlyphIndex += currentGlyph.getAnchorDelta();
currentGlyph = text.get(currentGlyphIndex);
}
}
xPlacement = -getSubrangeWidth(text, currentGlyphIndex, i) + xPlacementAddition * fontSize * scaling;
}
{
float yPlacementAddition = 0;
int currentGlyphIndex = i;
Glyph currentGlyph = text.get(i);
while (currentGlyph != null && currentGlyph.getYPlacement() != 0) {
yPlacementAddition += currentGlyph.getYPlacement();
if (currentGlyph.getAnchorDelta() == 0) {
break;
} else {
currentGlyphIndex += currentGlyph.getAnchorDelta();
currentGlyph = text.get(currentGlyphIndex);
}
}
yPlacement = -getSubrangeYDelta(text, currentGlyphIndex, i) + yPlacementAddition * fontSize;
}
contentStream.getOutputStream()
.writeFloat(xPlacement, true)
.writeSpace()
.writeFloat(yPlacement, true)
.writeSpace()
.writeBytes(Td);
}
font.writeText(text, i, i, contentStream.getOutputStream());
contentStream.getOutputStream().writeBytes(Tj);
if (!Float.isNaN(xPlacement)) {
contentStream.getOutputStream()
.writeFloat(-xPlacement, true)
.writeSpace()
.writeFloat(-yPlacement, true)
.writeSpace()
.writeBytes(Td);
}
if (glyph.hasAdvance()) {
contentStream.getOutputStream()
// Let's explicitly ignore width of glyphs with placement if they also have xAdvance, since their width doesn't affect text cursor position.
.writeFloat((((glyph.hasPlacement() ? 0 : glyph.getWidth()) + glyph.getXAdvance()) * fontSize + charSpacing + getWordSpacingAddition(glyph)) * scaling, true)
.writeSpace()
.writeFloat(glyph.getYAdvance() * fontSize, true)
.writeSpace()
.writeBytes(Td);
}
sub = i + 1;
}
}
if (glyphLinePart.end - sub > 0) {
font.writeText(text, sub, glyphLinePart.end - 1, contentStream.getOutputStream());
contentStream.getOutputStream().writeBytes(Tj);
}
if (glyphLinePart.actualText != null) {
endMarkedContent();
} else if (glyphLinePart.reversed) {
endMarkedContent();
}
if (glyphLinePart.end > sub && partIndex + 1 < glyphLineParts.size()) {
contentStream.getOutputStream()
.writeFloat(getSubrangeWidth(text, sub, glyphLinePart.end - 1), true)
.writeSpace()
.writeFloat(0)
.writeSpace()
.writeBytes(Td);
}
}
return this;
}
/**
* Finds horizontal distance between the start of the `from` glyph and end of `to` glyph.
* Glyphs with placement are ignored.
* XAdvance is not taken into account neither before `from` nor after `to` glyphs.
*/
private float getSubrangeWidth(GlyphLine text, int from, int to) {
final float fontSize = FontProgram.convertTextSpaceToGlyphSpace(currentGs.getFontSize());
float charSpacing = currentGs.getCharSpacing();
float scaling = currentGs.getHorizontalScaling() / 100f;
float width = 0;
for (int iter = from; iter <= to; iter++) {
Glyph glyph = text.get(iter);
if (!glyph.hasPlacement()) {
width += (glyph.getWidth() * fontSize + charSpacing + getWordSpacingAddition(glyph)) * scaling;
}
if (iter > from) {
width += text.get(iter - 1).getXAdvance() * fontSize * scaling;
}
}
return width;
}
private float getSubrangeYDelta(GlyphLine text, int from, int to) {
final float fontSize = FontProgram.convertTextSpaceToGlyphSpace(currentGs.getFontSize());
float yDelta = 0;
for (int iter = from; iter < to; iter++) {
yDelta += text.get(iter).getYAdvance() * fontSize;
}
return yDelta;
}
private float getWordSpacingAddition(Glyph glyph) {
// From the spec: Word spacing is applied to every occurrence of the single-byte character code 32 in
// a string when using a simple font or a composite font that defines code 32 as a single-byte code.
// It does not apply to occurrences of the byte value 32 in multiple-byte codes.
return !(currentGs.getFont() instanceof PdfType0Font) && glyph.hasValidUnicode() && glyph.getCode() == ' ' ? currentGs.getWordSpacing() : 0;
}
/**
* Shows text (operator TJ)
*
* @param textArray the text array. Each element of array can be a string or a number.
* If the element is a string, this operator shows the string.
* If it is a number, the operator adjusts the text position by that amount.
* The number is expressed in thousandths of a unit of text space.
* This amount is subtracted from the current horizontal or vertical coordinate, depending on the writing mode.
* @return current canvas.
*/
public PdfCanvas showText(PdfArray textArray) {
checkDefaultDeviceGrayBlackColor(getColorKeyForText());
document.checkIsoConformance(currentGs, IsoKey.FONT_GLYPHS, null, contentStream);
if (currentGs.getFont() == null) {
throw new PdfException(
KernelExceptionMessageConstant.FONT_AND_SIZE_MUST_BE_SET_BEFORE_WRITING_ANY_TEXT, currentGs);
}
// Take text part to process
StringBuilder text = new StringBuilder();
for (PdfObject obj : textArray) {
if (obj instanceof PdfString) {
text.append(obj);
}
}
document.checkIsoConformance(text.toString(), IsoKey.FONT, null, null, currentGs.getFont());
contentStream.getOutputStream().writeBytes(ByteUtils.getIsoBytes("["));
for (PdfObject obj : textArray) {
if (obj.isString()) {
StreamUtil.writeEscapedString(contentStream.getOutputStream(), ((PdfString) obj).getValueBytes());
} else if (obj.isNumber()) {
contentStream.getOutputStream().writeFloat(((PdfNumber) obj).floatValue());
}
}
contentStream.getOutputStream().writeBytes(ByteUtils.getIsoBytes("]"));
contentStream.getOutputStream().writeBytes(TJ);
return this;
}
/**
* Move the current point (x, y), omitting any connecting line segment.
*
* @param x x coordinate.
* @param y y coordinate.
* @return current canvas.
*/
public PdfCanvas moveTo(double x, double y) {
contentStream.getOutputStream()
.writeDouble(x)
.writeSpace()
.writeDouble(y).writeSpace()
.writeBytes(m);
return this;
}
/**
* Appends a straight line segment from the current point (x, y). The new current
* point is (x, y).
*
* @param x x coordinate.
* @param y y coordinate.
* @return current canvas.
*/
public PdfCanvas lineTo(double x, double y) {
contentStream.getOutputStream()
.writeDouble(x)
.writeSpace()
.writeDouble(y).writeSpace()
.writeBytes(l);
return this;
}
/**
* Appends a Bêzier curve to the path, starting from the current point.
*
* @param x1 x coordinate of the first control point.
* @param y1 y coordinate of the first control point.
* @param x2 x coordinate of the second control point.
* @param y2 y coordinate of the second control point.
* @param x3 x coordinate of the ending point.
* @param y3 y coordinate of the ending point.
* @return current canvas.
*/
public PdfCanvas curveTo(double x1, double y1, double x2, double y2, double x3, double y3) {
contentStream.getOutputStream()
.writeDouble(x1)
.writeSpace()
.writeDouble(y1)
.writeSpace()
.writeDouble(x2)
.writeSpace()
.writeDouble(y2)
.writeSpace()
.writeDouble(x3)
.writeSpace()
.writeDouble(y3)
.writeSpace()
.writeBytes(c);
return this;
}
/**
* Appends a Bezier curve to the path, starting from the current point.
*
* @param x2 x coordinate of the second control point.
* @param y2 y coordinate of the second control point.
* @param x3 x coordinate of the ending point.
* @param y3 y coordinate of the ending point.
* @return current canvas.
*/
public PdfCanvas curveTo(double x2, double y2, double x3, double y3) {
contentStream.getOutputStream()
.writeDouble(x2)
.writeSpace()
.writeDouble(y2)
.writeSpace()
.writeDouble(x3)
.writeSpace()
.writeDouble(y3).writeSpace()
.writeBytes(v);
return this;
}
/**
* Appends a Bezier curve to the path, starting from the current point.
*
* @param x1 x coordinate of the first control point.
* @param y1 y coordinate of the first control point.
* @param x3 x coordinate of the ending point.
* @param y3 y coordinate of the ending point.
* @return current canvas.
*/
public PdfCanvas curveFromTo(double x1, double y1, double x3, double y3) {
contentStream.getOutputStream()
.writeDouble(x1)
.writeSpace()
.writeDouble(y1)
.writeSpace()
.writeDouble(x3)
.writeSpace()
.writeDouble(y3).writeSpace()
.writeBytes(y);
return this;
}
/**
* Draws a partial ellipse inscribed within the rectangle x1,y1,x2,y2,
* starting at startAng degrees and covering extent degrees. Angles
* start with 0 to the right (+x) and increase counter-clockwise.
*
* @param x1 a corner of the enclosing rectangle.
* @param y1 a corner of the enclosing rectangle.
* @param x2 a corner of the enclosing rectangle.
* @param y2 a corner of the enclosing rectangle.
* @param startAng starting angle in degrees.
* @param extent angle extent in degrees.
* @return current canvas.
*/
public PdfCanvas arc(double x1, double y1, double x2, double y2,
double startAng, double extent) {
return drawArc(x1, y1, x2, y2, startAng, extent, false);
}
/**
* Draws a partial ellipse with the preceding line to the start of the arc to prevent path
* broking. The target arc is inscribed within the rectangle x1,y1,x2,y2, starting
* at startAng degrees and covering extent degrees. Angles start with 0 to the right (+x)
* and increase counter-clockwise.
*
* @param x1 a corner of the enclosing rectangle
* @param y1 a corner of the enclosing rectangle
* @param x2 a corner of the enclosing rectangle
* @param y2 a corner of the enclosing rectangle
* @param startAng starting angle in degrees
* @param extent angle extent in degrees
*
* @return the current canvas
*/
public PdfCanvas arcContinuous(double x1, double y1, double x2, double y2,
double startAng, double extent) {
return drawArc(x1, y1, x2, y2, startAng, extent, true);
}
/**
* Draws an ellipse inscribed within the rectangle x1,y1,x2,y2.
*
* @param x1 a corner of the enclosing rectangle
* @param y1 a corner of the enclosing rectangle
* @param x2 a corner of the enclosing rectangle
* @param y2 a corner of the enclosing rectangle
* @return current canvas.
*/
public PdfCanvas ellipse(double x1, double y1, double x2, double y2) {
return arc(x1, y1, x2, y2, 0f, 360f);
}
/**
* Generates an array of bezier curves to draw an arc.
*
* (x1, y1) and (x2, y2) are the corners of the enclosing rectangle.
* Angles, measured in degrees, start with 0 to the right (the positive X
* axis) and increase counter-clockwise. The arc extends from startAng
* to startAng+extent. i.e. startAng=0 and extent=180 yields an openside-down
* semi-circle.
*
* The resulting coordinates are of the form double[]{x1,y1,x2,y2,x3,y3, x4,y4}
* such that the curve goes from (x1, y1) to (x4, y4) with (x2, y2) and
* (x3, y3) as their respective Bezier control points.
*
* Note: this code was taken from ReportLab (www.reportlab.org), an excellent
* PDF generator for Python (BSD license: http://www.reportlab.org/devfaq.html#1.3 ).
*
* @param x1 a corner of the enclosing rectangle.
* @param y1 a corner of the enclosing rectangle.
* @param x2 a corner of the enclosing rectangle.
* @param y2 a corner of the enclosing rectangle.
* @param startAng starting angle in degrees.
* @param extent angle extent in degrees.
* @return a list of double[] with the bezier curves.
*/
public static List bezierArc(double x1, double y1, double x2, double y2, double startAng, double extent) {
double tmp;
if (x1 > x2) {
tmp = x1;
x1 = x2;
x2 = tmp;
}
if (y2 > y1) {
tmp = y1;
y1 = y2;
y2 = tmp;
}
double fragAngle;
int Nfrag;
if (Math.abs(extent) <= 90f) {
fragAngle = extent;
Nfrag = 1;
} else {
Nfrag = (int) Math.ceil(Math.abs(extent) / 90f);
fragAngle = extent / Nfrag;
}
double x_cen = (x1 + x2) / 2f;
double y_cen = (y1 + y2) / 2f;
double rx = (x2 - x1) / 2f;
double ry = (y2 - y1) / 2f;
double halfAng = (fragAngle * Math.PI / 360.0);
double kappa = Math.abs(4.0 / 3.0 * (1.0 - Math.cos(halfAng)) / Math.sin(halfAng));
List pointList = new ArrayList<>();
for (int iter = 0; iter < Nfrag; ++iter) {
double theta0 = ((startAng + iter * fragAngle) * Math.PI / 180.0);
double theta1 = ((startAng + (iter + 1) * fragAngle) * Math.PI / 180.0);
double cos0 = Math.cos(theta0);
double cos1 = Math.cos(theta1);
double sin0 = Math.sin(theta0);
double sin1 = Math.sin(theta1);
if (fragAngle > 0.0) {
pointList.add(new double[]{x_cen + rx * cos0,
y_cen - ry * sin0,
x_cen + rx * (cos0 - kappa * sin0),
y_cen - ry * (sin0 + kappa * cos0),
x_cen + rx * (cos1 + kappa * sin1),
y_cen - ry * (sin1 - kappa * cos1),
x_cen + rx * cos1,
y_cen - ry * sin1});
} else {
pointList.add(new double[]{x_cen + rx * cos0,
y_cen - ry * sin0,
x_cen + rx * (cos0 + kappa * sin0),
y_cen - ry * (sin0 - kappa * cos0),
x_cen + rx * (cos1 - kappa * sin1),
y_cen - ry * (sin1 + kappa * cos1),
x_cen + rx * cos1,
y_cen - ry * sin1});
}
}
return pointList;
}
/**
* Draws a rectangle.
*
* @param x x coordinate of the starting point.
* @param y y coordinate of the starting point.
* @param width width.
* @param height height.
* @return current canvas.
*/
public PdfCanvas rectangle(double x, double y, double width, double height) {
contentStream.getOutputStream().writeDouble(x).
writeSpace().
writeDouble(y).
writeSpace().
writeDouble(width).
writeSpace().
writeDouble(height).
writeSpace().
writeBytes(re);
return this;
}
/**
* Draws a rectangle.
*
* @param rectangle a rectangle to be drawn
* @return current canvas.
*/
public PdfCanvas rectangle(Rectangle rectangle) {
return rectangle(rectangle.getX(), rectangle.getY(), rectangle.getWidth(), rectangle.getHeight());
}
/**
* Draws rounded rectangle.
*
* @param x x coordinate of the starting point.
* @param y y coordinate of the starting point.
* @param width width.
* @param height height.
* @param radius radius of the arc corner.
* @return current canvas.
*/
public PdfCanvas roundRectangle(double x, double y, double width, double height, double radius) {
if (width < 0) {
x += width;
width = -width;
}
if (height < 0) {
y += height;
height = -height;
}
if (radius < 0)
radius = -radius;
final double curv = 0.4477f;
moveTo(x + radius, y);
lineTo(x + width - radius, y);
curveTo(x + width - radius * curv, y, x + width, y + radius * curv, x + width, y + radius);
lineTo(x + width, y + height - radius);
curveTo(x + width, y + height - radius * curv, x + width - radius * curv, y + height, x + width - radius, y + height);
lineTo(x + radius, y + height);
curveTo(x + radius * curv, y + height, x, y + height - radius * curv, x, y + height - radius);
lineTo(x, y + radius);
curveTo(x, y + radius * curv, x + radius * curv, y, x + radius, y);
return this;
}
/**
* Draws a circle. The endpoint will (x+r, y).
*
* @param x x center of circle.
* @param y y center of circle.
* @param r radius of circle.
* @return current canvas.
*/
public PdfCanvas circle(double x, double y, double r) {
final double curve = 0.5523f;
moveTo(x + r, y);
curveTo(x + r, y + r * curve, x + r * curve, y + r, x, y + r);
curveTo(x - r * curve, y + r, x - r, y + r * curve, x - r, y);
curveTo(x - r, y - r * curve, x - r * curve, y - r, x, y - r);
curveTo(x + r * curve, y - r, x + r, y - r * curve, x + r, y);
return this;
}
/**
* Paints a shading object and adds it to the resources of this canvas
*
* @param shading a shading object to be painted
* @return current canvas.
*/
public PdfCanvas paintShading(PdfShading shading) {
PdfName shadingName = resources.addShading(shading);
contentStream.getOutputStream().write((PdfObject) shadingName).writeSpace().writeBytes(sh);
return this;
}
/**
* Closes the current subpath by appending a straight line segment from the current point
* to the starting point of the subpath.
*
* @return current canvas.
*/
public PdfCanvas closePath() {
contentStream.getOutputStream().writeBytes(h);
return this;
}
/**
* Closes the path, fills it using the even-odd rule to determine the region to fill and strokes it.
*
* @return current canvas.
*/
public PdfCanvas closePathEoFillStroke() {
checkDefaultDeviceGrayBlackColor(CheckColorMode.FILL_AND_STROKE);
contentStream.getOutputStream().writeBytes(bStar);
return this;
}
/**
* Closes the path, fills it using the non-zero winding number rule to determine the region to fill and strokes it.
*
* @return current canvas.
*/
public PdfCanvas closePathFillStroke() {
checkDefaultDeviceGrayBlackColor(CheckColorMode.FILL_AND_STROKE);
contentStream.getOutputStream().writeBytes(b);
return this;
}
/**
* Ends the path without filling or stroking it.
*
* @return current canvas.
*/
public PdfCanvas endPath() {
contentStream.getOutputStream().writeBytes(n);
return this;
}
/**
* Strokes the path.
*
* @return current canvas.
*/
public PdfCanvas stroke() {
checkDefaultDeviceGrayBlackColor(CheckColorMode.STROKE);
contentStream.getOutputStream().writeBytes(S);
return this;
}
/**
* Modify the current clipping path by intersecting it with the current path, using the
* nonzero winding rule to determine which regions lie inside the clipping path.
*
* @return current canvas.
*/
public PdfCanvas clip() {
contentStream.getOutputStream().writeBytes(W);
return this;
}
/**
* Modify the current clipping path by intersecting it with the current path, using the
* even-odd rule to determine which regions lie inside the clipping path.
*
* @return current canvas.
*/
public PdfCanvas eoClip() {
contentStream.getOutputStream().writeBytes(WStar);
return this;
}
/**
* Closes the path and strokes it.
*
* @return current canvas.
*/
public PdfCanvas closePathStroke() {
contentStream.getOutputStream().writeBytes(s);
return this;
}
/**
* Fills current path.
*
* @return current canvas.
*/
public PdfCanvas fill() {
checkDefaultDeviceGrayBlackColor(CheckColorMode.FILL);
contentStream.getOutputStream().writeBytes(f);
return this;
}
/**
* Fills the path using the non-zero winding number rule to determine the region to fill and strokes it.
*
* @return current canvas.
*/
public PdfCanvas fillStroke() {
checkDefaultDeviceGrayBlackColor(CheckColorMode.FILL_AND_STROKE);
contentStream.getOutputStream().writeBytes(B);
return this;
}
/**
* EOFills current path.
*
* @return current canvas.
*/
public PdfCanvas eoFill() {
checkDefaultDeviceGrayBlackColor(CheckColorMode.FILL);
contentStream.getOutputStream().writeBytes(fStar);
return this;
}
/**
* Fills the path, using the even-odd rule to determine the region to fill and strokes it.
*
* @return current canvas.
*/
public PdfCanvas eoFillStroke() {
checkDefaultDeviceGrayBlackColor(CheckColorMode.FILL_AND_STROKE);
contentStream.getOutputStream().writeBytes(BStar);
return this;
}
/**
* Sets line width.
*
* @param lineWidth line width.
* @return current canvas.
*/
public PdfCanvas setLineWidth(float lineWidth) {
if (currentGs.getLineWidth() == lineWidth) {
return this;
}
currentGs.setLineWidth(lineWidth);
contentStream.getOutputStream()
.writeFloat(lineWidth).writeSpace()
.writeBytes(w);
return this;
}
/**
* Sets the line cap style, the shape to be used at the ends of open subpaths
* when they are stroked.
*
* @param lineCapStyle a line cap style to be set
* @return current canvas.
* @see PdfCanvasConstants.LineCapStyle for possible values.
*/
public PdfCanvas setLineCapStyle(int lineCapStyle) {
if (currentGs.getLineCapStyle() == lineCapStyle)
return this;
currentGs.setLineCapStyle(lineCapStyle);
contentStream.getOutputStream()
.writeInteger(lineCapStyle).writeSpace()
.writeBytes(J);
return this;
}
/**
* Sets the line join style, the shape to be used at the corners of paths
* when they are stroked.
*
* @param lineJoinStyle a line join style to be set
* @return current canvas.
* @see PdfCanvasConstants.LineJoinStyle for possible values.
*/
public PdfCanvas setLineJoinStyle(int lineJoinStyle) {
if (currentGs.getLineJoinStyle() == lineJoinStyle)
return this;
currentGs.setLineJoinStyle(lineJoinStyle);
contentStream.getOutputStream()
.writeInteger(lineJoinStyle).writeSpace()
.writeBytes(j);
return this;
}
/**
* Sets the miter limit, a parameter specifying the maximum length a miter join
* may extend beyond the join point, relative to the angle of the line segments.
*
* @param miterLimit a miter limit to be set
* @return current canvas.
*/
public PdfCanvas setMiterLimit(float miterLimit) {
if (currentGs.getMiterLimit() == miterLimit)
return this;
currentGs.setMiterLimit(miterLimit);
contentStream.getOutputStream()
.writeFloat(miterLimit).writeSpace()
.writeBytes(M);
return this;
}
/**
* Changes the value of the line dash pattern.
*
* The line dash pattern controls the pattern of dashes and gaps used to stroke paths.
* It is specified by an array and a phase. The array specifies the length
* of the alternating dashes and gaps. The phase specifies the distance into the dash
* pattern to start the dash.
*
* @param phase the value of the phase
* @return current canvas.
*/
public PdfCanvas setLineDash(float phase) {
currentGs.setDashPattern(getDashPatternArray(phase));
contentStream.getOutputStream().writeByte('[').writeByte(']').writeSpace()
.writeFloat(phase).writeSpace()
.writeBytes(d);
return this;
}
/**
* Changes the value of the line dash pattern.
*
* The line dash pattern controls the pattern of dashes and gaps used to stroke paths.
* It is specified by an array and a phase. The array specifies the length
* of the alternating dashes and gaps. The phase specifies the distance into the dash
* pattern to start the dash.
*
* @param phase the value of the phase
* @param unitsOn the number of units that must be 'on' (equals the number of units that must be 'off').
* @return current canvas.
*/
public PdfCanvas setLineDash(float unitsOn, float phase) {
currentGs.setDashPattern(getDashPatternArray(new float[]{unitsOn}, phase));
contentStream.getOutputStream().writeByte('[').writeFloat(unitsOn).writeByte(']').writeSpace()
.writeFloat(phase).writeSpace()
.writeBytes(d);
return this;
}
/**
* Changes the value of the line dash pattern.
*
* The line dash pattern controls the pattern of dashes and gaps used to stroke paths.
* It is specified by an array and a phase. The array specifies the length
* of the alternating dashes and gaps. The phase specifies the distance into the dash
* pattern to start the dash.
*
* @param phase the value of the phase
* @param unitsOn the number of units that must be 'on'
* @param unitsOff the number of units that must be 'off'
* @return current canvas.
*/
public PdfCanvas setLineDash(float unitsOn, float unitsOff, float phase) {
currentGs.setDashPattern(getDashPatternArray(new float[]{unitsOn, unitsOff}, phase));
contentStream.getOutputStream().writeByte('[').writeFloat(unitsOn).writeSpace()
.writeFloat(unitsOff).writeByte(']').writeSpace()
.writeFloat(phase).writeSpace()
.writeBytes(d);
return this;
}
/**
* Changes the value of the line dash pattern.
*
* The line dash pattern controls the pattern of dashes and gaps used to stroke paths.
* It is specified by an array and a phase. The array specifies the length
* of the alternating dashes and gaps. The phase specifies the distance into the dash
* pattern to start the dash.
*
* @param array length of the alternating dashes and gaps
* @param phase the value of the phase
* @return current canvas.
*/
public PdfCanvas setLineDash(float[] array, float phase) {
currentGs.setDashPattern(getDashPatternArray(array, phase));
PdfOutputStream out = contentStream.getOutputStream();
out.writeByte('[');
for (int iter = 0; iter < array.length; iter++) {
out.writeFloat(array[iter]);
if (iter < array.length - 1)
out.writeSpace();
}
out.writeByte(']').writeSpace().writeFloat(phase).writeSpace().writeBytes(d);
return this;
}
/**
* Set the rendering intent. possible values are: PdfName.AbsoluteColorimetric,
* PdfName.RelativeColorimetric, PdfName.Saturation, PdfName.Perceptual.
*
* @param renderingIntent a PdfName containing a color metric
* @return current canvas.
*/
public PdfCanvas setRenderingIntent(PdfName renderingIntent) {
document.checkIsoConformance(renderingIntent, IsoKey.RENDERING_INTENT);
if (renderingIntent.equals(currentGs.getRenderingIntent()))
return this;
currentGs.setRenderingIntent(renderingIntent);
contentStream.getOutputStream()
.write(renderingIntent).writeSpace()
.writeBytes(ri);
return this;
}
/**
* Changes the Flatness.
*
* Flatness sets the maximum permitted distance in device pixels between the
* mathematically correct path and an approximation constructed from straight line segments.
*
* @param flatnessTolerance a value
* @return current canvas.
*/
public PdfCanvas setFlatnessTolerance(float flatnessTolerance) {
if (currentGs.getFlatnessTolerance() == flatnessTolerance)
return this;
currentGs.setFlatnessTolerance(flatnessTolerance);
contentStream.getOutputStream()
.writeFloat(flatnessTolerance).writeSpace()
.writeBytes(i);
return this;
}
/**
* Changes the current color for filling paths.
*
* @param color fill color.
* @return current canvas.
*/
public PdfCanvas setFillColor(Color color) {
return setColor(color, true);
}
/**
* Changes the current color for stroking paths.
*
* @param color stroke color.
* @return current canvas.
*/
public PdfCanvas setStrokeColor(Color color) {
return setColor(color, false);
}
/**
* Changes the current color for paths.
*
* @param color the new color.
* @param fill set fill color (true) or stroke color (false)
* @return current canvas.
*/
public PdfCanvas setColor(Color color, boolean fill) {
if (color instanceof PatternColor) {
return setColor(color.getColorSpace(), color.getColorValue(), ((PatternColor) color).getPattern(), fill);
} else {
return setColor(color.getColorSpace(), color.getColorValue(), fill);
}
}
/**
* Changes the current color for paths.
*
* @param colorSpace the color space of the new color
* @param colorValue a list of numerical values with a length corresponding to the specs of the color space. Values should be in the range [0,1]
* @param fill set fill color (true) or stroke color (false)
* @return current canvas.
*/
public PdfCanvas setColor(PdfColorSpace colorSpace, float[] colorValue, boolean fill) {
return setColor(colorSpace, colorValue, null, fill);
}
/**
* Changes the current color for paths with an explicitly defined pattern.
*
* @param colorSpace the color space of the new color
* @param colorValue a list of numerical values with a length corresponding to the specs of the color space. Values should be in the range [0,1]
* @param pattern a pattern for the colored line or area
* @param fill set fill color (true) or stroke color (false)
* @return current canvas.
*/
public PdfCanvas setColor(PdfColorSpace colorSpace, float[] colorValue, PdfPattern pattern, boolean fill) {
boolean setColorValueOnly = false;
Color oldColor = fill ? currentGs.getFillColor() : currentGs.getStrokeColor();
Color newColor = createColor(colorSpace, colorValue, pattern);
if (oldColor.equals(newColor))
return this;
else {
if (fill) {
currentGs.setFillColor(newColor);
} else {
currentGs.setStrokeColor(newColor);
}
if (oldColor.getColorSpace().getPdfObject().equals(colorSpace.getPdfObject())) {
setColorValueOnly = true;
}
}
if (colorSpace instanceof PdfDeviceCs.Gray)
contentStream.getOutputStream().writeFloats(colorValue).writeSpace().writeBytes(fill ? g : G);
else if (colorSpace instanceof PdfDeviceCs.Rgb)
contentStream.getOutputStream().writeFloats(colorValue).writeSpace().writeBytes(fill ? rg : RG);
else if (colorSpace instanceof PdfDeviceCs.Cmyk)
contentStream.getOutputStream().writeFloats(colorValue).writeSpace().writeBytes(fill ? k : K);
else if (colorSpace instanceof PdfSpecialCs.UncoloredTilingPattern)
contentStream.getOutputStream().write(resources.addColorSpace(colorSpace)).writeSpace().writeBytes(fill ? cs : CS).
writeNewLine().writeFloats(colorValue).writeSpace().write(resources.addPattern(pattern)).writeSpace().writeBytes(fill ? scn : SCN);
else if (colorSpace instanceof PdfSpecialCs.Pattern)
contentStream.getOutputStream().write(PdfName.Pattern).writeSpace().writeBytes(fill ? cs : CS).
writeNewLine().write(resources.addPattern(pattern)).writeSpace().writeBytes(fill ? scn : SCN);
else if (colorSpace.getPdfObject().isIndirect()) {
if (!setColorValueOnly) {
PdfName name = resources.addColorSpace(colorSpace);
contentStream.getOutputStream().write(name).writeSpace().writeBytes(fill ? cs : CS);
}
contentStream.getOutputStream().writeFloats(colorValue).writeSpace().writeBytes(fill ? scn : SCN);
}
document.checkIsoConformance(currentGs, fill ? IsoKey.FILL_COLOR : IsoKey.STROKE_COLOR, resources, contentStream);
return this;
}
/**
* Changes the current color for filling paths to a grayscale value.
*
* @param g a grayscale value in the range [0,1]
* @return current canvas.
*/
public PdfCanvas setFillColorGray(float g) {
return setColor(gray, new float[]{g}, true);
}
/**
* Changes the current color for stroking paths to a grayscale value.
*
* @param g a grayscale value in the range [0,1]
* @return current canvas.
*/
public PdfCanvas setStrokeColorGray(float g) {
return setColor(gray, new float[]{g}, false);
}
/**
* Changes the current color for filling paths to black.
*
* @return current canvas.
*/
public PdfCanvas resetFillColorGray() {
return setFillColorGray(0);
}
/**
* Changes the current color for stroking paths to black.
*
* @return current canvas.
*/
public PdfCanvas resetStrokeColorGray() {
return setStrokeColorGray(0);
}
/**
* Changes the current color for filling paths to an RGB value.
*
* @param r a red value in the range [0,1]
* @param g a green value in the range [0,1]
* @param b a blue value in the range [0,1]
* @return current canvas.
*/
public PdfCanvas setFillColorRgb(float r, float g, float b) {
return setColor(rgb, new float[]{r, g, b}, true);
}
/**
* Changes the current color for stroking paths to an RGB value.
*
* @param r a red value in the range [0,1]
* @param g a green value in the range [0,1]
* @param b a blue value in the range [0,1]
* @return current canvas.
*/
public PdfCanvas setStrokeColorRgb(float r, float g, float b) {
return setColor(rgb, new float[]{r, g, b}, false);
}
/**
* Adds or changes the shading of the current fill color path.
*
* @param shading the shading
* @return current canvas.
*/
public PdfCanvas setFillColorShading(PdfPattern.Shading shading) {
return setColor(pattern, null, shading, true);
}
/**
* Adds or changes the shading of the current stroke color path.
*
* @param shading the shading
* @return current canvas.
*/
public PdfCanvas setStrokeColorShading(PdfPattern.Shading shading) {
return setColor(pattern, null, shading, false);
}
/**
* Changes the current color for filling paths to black.
*
* @return current canvas.
*/
public PdfCanvas resetFillColorRgb() {
return resetFillColorGray();
}
/**
* Changes the current color for stroking paths to black.
*
* @return current canvas.
*/
public PdfCanvas resetStrokeColorRgb() {
return resetStrokeColorGray();
}
/**
* Changes the current color for filling paths to a CMYK value.
*
* @param c a cyan value in the range [0,1]
* @param m a magenta value in the range [0,1]
* @param y a yellow value in the range [0,1]
* @param k a key (black) value in the range [0,1]
* @return current canvas.
*/
public PdfCanvas setFillColorCmyk(float c, float m, float y, float k) {
return setColor(cmyk, new float[]{c, m, y, k}, true);
}
/**
* Changes the current color for stroking paths to a CMYK value.
*
* @param c a cyan value in the range [0,1]
* @param m a magenta value in the range [0,1]
* @param y a yellow value in the range [0,1]
* @param k a key (black) value in the range [0,1]
* @return current canvas.
*/
public PdfCanvas setStrokeColorCmyk(float c, float m, float y, float k) {
return setColor(cmyk, new float[]{c, m, y, k}, false);
}
/**
* Changes the current color for filling paths to black.
*
* @return current canvas.
*/
public PdfCanvas resetFillColorCmyk() {
return setFillColorCmyk(0, 0, 0, 1);
}
/**
* Changes the current color for stroking paths to black.
*
* @return current canvas.
*/
public PdfCanvas resetStrokeColorCmyk() {
return setStrokeColorCmyk(0, 0, 0, 1);
}
/**
* Begins a graphic block whose visibility is controlled by the layer.
* Blocks can be nested. Each block must be terminated by an {@link #endLayer()}.
* Note that nested layers with {@link PdfLayer#addChild(PdfLayer)} only require a single
* call to this method and a single call to {@link #endLayer()}; all the nesting control
* is built in.
*
* @param layer The layer to begin
* @return The edited canvas.
*/
public PdfCanvas beginLayer(IPdfOCG layer) {
if (layer instanceof PdfLayer && ((PdfLayer) layer).getTitle() != null)
throw new IllegalArgumentException("Illegal layer argument.");
if (layerDepth == null)
layerDepth = new ArrayList<>();
if (layer instanceof PdfLayerMembership) {
layerDepth.add(1);
addToPropertiesAndBeginLayer(layer);
} else if (layer instanceof PdfLayer) {
int num = 0;
PdfLayer la = (PdfLayer) layer;
while (la != null) {
if (la.getTitle() == null) {
addToPropertiesAndBeginLayer(la);
num++;
}
la = la.getParent();
}
layerDepth.add(num);
} else
throw new UnsupportedOperationException("Unsupported type for operand: layer");
return this;
}
/**
* Ends OCG layer.
*
* @return current canvas.
*/
public PdfCanvas endLayer() {
int num;
if (layerDepth != null && !layerDepth.isEmpty()) {
num = (int) layerDepth.get(layerDepth.size() - 1);
layerDepth.remove(layerDepth.size() - 1);
} else {
throw new PdfException(KernelExceptionMessageConstant.UNBALANCED_LAYER_OPERATORS);
}
while (num-- > 0)
contentStream.getOutputStream().writeBytes(EMC).writeNewLine();
return this;
}
/**
* Creates {@link PdfImageXObject} from image and adds it to canvas.
*
*
* The float arguments will be used in concatenating the transformation matrix as operands.
*
* @param image the image from which {@link PdfImageXObject} will be created
* @param a an element of the transformation matrix
* @param b an element of the transformation matrix
* @param c an element of the transformation matrix
* @param d an element of the transformation matrix
* @param e an element of the transformation matrix
* @param f an element of the transformation matrix
* @return the created imageXObject or null in case of in-line image (asInline = true)
* @see #concatMatrix(double, double, double, double, double, double)
*/
public PdfXObject addImageWithTransformationMatrix(ImageData image, float a, float b, float c, float d, float e, float f) {
return addImageWithTransformationMatrix(image, a, b, c, d, e, f, false);
}
/**
* Creates {@link PdfImageXObject} from image and adds it to canvas.
*
*
* The float arguments will be used in concatenating the transformation matrix as operands.
*
* @param image the image from which {@link PdfImageXObject} will be created
* @param a an element of the transformation matrix
* @param b an element of the transformation matrix
* @param c an element of the transformation matrix
* @param d an element of the transformation matrix
* @param e an element of the transformation matrix
* @param f an element of the transformation matrix
* @param asInline true if to add image as in-line
* @return the created imageXObject or null in case of in-line image (asInline = true)
* @see #concatMatrix(double, double, double, double, double, double)
*/
public PdfXObject addImageWithTransformationMatrix(ImageData image, float a, float b, float c, float d, float e, float f, boolean asInline) {
if (image.getOriginalType() == ImageType.WMF) {
WmfImageHelper wmf = new WmfImageHelper(image);
PdfXObject xObject = wmf.createFormXObject(document);
addXObjectWithTransformationMatrix(xObject, a, b, c, d, e, f);
return xObject;
} else {
PdfImageXObject imageXObject = new PdfImageXObject(image);
if (asInline && image.canImageBeInline()) {
addInlineImage(imageXObject, a, b, c, d, e, f);
return null;
} else {
addImageWithTransformationMatrix(imageXObject, a, b, c, d, e, f);
return imageXObject;
}
}
}
/**
* Creates {@link PdfImageXObject} from image and fitted into specific rectangle on canvas.
* The created imageXObject will be fit inside on the specified rectangle without preserving aspect ratio.
*
*
* The x, y, width and height parameters of the rectangle will be used in concatenating
* the transformation matrix as operands.
*
* @param image the image from which {@link PdfImageXObject} will be created
* @param rect the rectangle in which the created imageXObject will be fit
* @param asInline true if to add image as in-line
* @return the created imageXObject or null in case of in-line image (asInline = true)
* @see #concatMatrix(double, double, double, double, double, double)
* @see PdfXObject#calculateProportionallyFitRectangleWithWidth(PdfXObject, float, float, float)
* @see PdfXObject#calculateProportionallyFitRectangleWithHeight(PdfXObject, float, float, float)
*/
public PdfXObject addImageFittedIntoRectangle(ImageData image, Rectangle rect, boolean asInline) {
return addImageWithTransformationMatrix(image, rect.getWidth(), 0, 0, rect.getHeight(),
rect.getX(), rect.getY(), asInline);
}
/**
* Creates {@link PdfImageXObject} from image and adds it to the specified position.
*
* @param image the image from which {@link PdfImageXObject} will be created
* @param x the horizontal position of the imageXObject
* @param y the vertical position of the imageXObject
* @param asInline true if to add image as in-line
* @return the created imageXObject or null in case of in-line image (asInline = true)
*/
public PdfXObject addImageAt(ImageData image, float x, float y, boolean asInline) {
if (image.getOriginalType() == ImageType.WMF) {
WmfImageHelper wmf = new WmfImageHelper(image);
PdfXObject xObject = wmf.createFormXObject(document);
//For FormXObject args "a" and "d" will become multipliers and will not set the size, as for ImageXObject
addXObjectWithTransformationMatrix(xObject, 1, 0, 0, 1, x, y);
return xObject;
} else {
PdfImageXObject imageXObject = new PdfImageXObject(image);
if (asInline && image.canImageBeInline()) {
addInlineImage(imageXObject, image.getWidth(), 0, 0, image.getHeight(), x, y);
return null;
} else {
addImageWithTransformationMatrix(imageXObject, image.getWidth(), 0, 0, image.getHeight(), x, y);
return imageXObject;
}
}
}
/**
* Adds {@link PdfXObject} to canvas.
*
*
* The float arguments will be used in concatenating the transformation matrix as operands.
*
* @param xObject the xObject to add
* @param a an element of the transformation matrix
* @param b an element of the transformation matrix
* @param c an element of the transformation matrix
* @param d an element of the transformation matrix
* @param e an element of the transformation matrix
* @param f an element of the transformation matrix
* @return the current canvas
* @see #concatMatrix(double, double, double, double, double, double)
*/
public PdfCanvas addXObjectWithTransformationMatrix(PdfXObject xObject, float a, float b, float c, float d, float e, float f) {
if (xObject instanceof PdfFormXObject) {
return addFormWithTransformationMatrix((PdfFormXObject) xObject, a, b, c, d, e, f, true);
} else if (xObject instanceof PdfImageXObject) {
return addImageWithTransformationMatrix(xObject, a, b, c, d, e, f);
} else {
throw new IllegalArgumentException("PdfFormXObject or PdfImageXObject expected.");
}
}
/**
* Adds {@link PdfXObject} to the specified position.
*
* @param xObject the xObject to add
* @param x the horizontal position of the xObject
* @param y the vertical position of the xObject
* @return the current canvas
*/
public PdfCanvas addXObjectAt(PdfXObject xObject, float x, float y) {
if (xObject instanceof PdfFormXObject) {
return addFormAt((PdfFormXObject) xObject, x, y);
} else if (xObject instanceof PdfImageXObject) {
return addImageAt((PdfImageXObject) xObject, x, y);
} else {
throw new IllegalArgumentException("PdfFormXObject or PdfImageXObject expected.");
}
}
/**
* Adds {@link PdfXObject} fitted into specific rectangle on canvas.
*
* @param xObject the xObject to add
* @param rect the rectangle in which the xObject will be fitted
* @return the current canvas
* @see PdfXObject#calculateProportionallyFitRectangleWithWidth(PdfXObject, float, float, float)
* @see PdfXObject#calculateProportionallyFitRectangleWithHeight(PdfXObject, float, float, float)
*/
public PdfCanvas addXObjectFittedIntoRectangle(PdfXObject xObject, Rectangle rect) {
if (xObject instanceof PdfFormXObject) {
return addFormFittedIntoRectangle((PdfFormXObject) xObject, rect);
} else if (xObject instanceof PdfImageXObject) {
return addImageFittedIntoRectangle((PdfImageXObject) xObject, rect);
} else {
throw new IllegalArgumentException("PdfFormXObject or PdfImageXObject expected.");
}
}
/**
* Adds {@link PdfXObject} on canvas.
*
*
* Note: the {@link PdfImageXObject} will be placed at coordinates (0, 0) with its
* original width and height, the {@link PdfFormXObject} will be fitted in its bBox.
*
* @param xObject the xObject to add
* @return the current canvas
*/
public PdfCanvas addXObject(PdfXObject xObject) {
if (xObject instanceof PdfFormXObject) {
return addFormWithTransformationMatrix((PdfFormXObject) xObject, 1, 0, 0, 1, 0, 0, false);
} else if (xObject instanceof PdfImageXObject) {
return addImageAt((PdfImageXObject) xObject, 0, 0);
} else {
throw new IllegalArgumentException("PdfFormXObject or PdfImageXObject expected.");
}
}
/**
* Sets the ExtGState dictionary for the current graphics state
*
* @param extGState a dictionary that maps resource names to graphics state parameter dictionaries
* @return current canvas.
*/
public PdfCanvas setExtGState(PdfExtGState extGState) {
if (!extGState.isFlushed())
currentGs.updateFromExtGState(extGState, document);
PdfName name = resources.addExtGState(extGState);
contentStream.getOutputStream().write(name).writeSpace().writeBytes(gs);
document.checkIsoConformance(currentGs, IsoKey.EXTENDED_GRAPHICS_STATE, null, contentStream);
return this;
}
/**
* Sets the ExtGState dictionary for the current graphics state
*
* @param extGState a dictionary that maps resource names to graphics state parameter dictionaries
* @return current canvas.
*/
public PdfExtGState setExtGState(PdfDictionary extGState) {
PdfExtGState egs = new PdfExtGState(extGState);
setExtGState(egs);
return egs;
}
/**
* Manually start a Marked Content sequence. Used primarily for Tagged PDF
*
* @param tag the type of content contained
* @return current canvas
*/
public PdfCanvas beginMarkedContent(PdfName tag) {
return beginMarkedContent(tag, null);
}
/**
* Manually start a Marked Content sequence with properties. Used primarily for Tagged PDF
*
* @param tag the type of content that will be contained
* @param properties the properties of the content, including Marked Content ID. If null, the PDF marker is BMC, else it is BDC
* @return current canvas
*/
public PdfCanvas beginMarkedContent(PdfName tag, PdfDictionary properties) {
mcDepth++;
PdfOutputStream out = contentStream.getOutputStream().write(tag).writeSpace();
if (properties == null) {
out.writeBytes(BMC);
} else if (properties.getIndirectReference() == null) {
out.write(properties).writeSpace().writeBytes(BDC);
} else {
out.write(resources.addProperties(properties)).writeSpace().writeBytes(BDC);
}
return this;
}
/**
* Manually end a Marked Content sequence. Used primarily for Tagged PDF
*
* @return current canvas
*/
public PdfCanvas endMarkedContent() {
if (--mcDepth < 0)
throw new PdfException(KernelExceptionMessageConstant.UNBALANCED_BEGIN_END_MARKED_CONTENT_OPERATORS);
contentStream.getOutputStream().writeBytes(EMC);
return this;
}
/**
* Manually open a canvas tag, beginning a Marked Content sequence. Used primarily for Tagged PDF
*
* @param tag the type of content that will be contained
* @return current canvas
*/
public PdfCanvas openTag(CanvasTag tag) {
if (tag.getRole() == null)
return this;
return beginMarkedContent(tag.getRole(), tag.getProperties());
}
/**
* Open a tag, beginning a Marked Content sequence. This MC sequence will belong to the tag from the document
* logical structure.
*
* CanvasTag will be automatically created with assigned mcid(Marked Content id) to it. Mcid serves as a reference
* between Marked Content sequence and logical structure element.
*
* @param tagReference reference to the tag from the document logical structure
* @return current canvas
*/
public PdfCanvas openTag(TagReference tagReference) {
if (tagReference.getRole() == null)
return this;
CanvasTag tag = new CanvasTag(tagReference.getRole());
tag.setProperties(tagReference.getProperties())
.addProperty(PdfName.MCID, new PdfNumber(tagReference.createNextMcid()));
return openTag(tag);
}
/**
* Manually close a tag, ending a Marked Content sequence. Used primarily for Tagged PDF
*
* @return current canvas
*/
public PdfCanvas closeTag() {
return endMarkedContent();
}
/**
* Outputs a {@code String} directly to the content.
*
* @param s the {@code String}
* @return current canvas.
*/
public PdfCanvas writeLiteral(String s) {
contentStream.getOutputStream().writeString(s);
return this;
}
/**
* Outputs a {@code char} directly to the content.
*
* @param c the {@code char}
* @return current canvas.
*/
public PdfCanvas writeLiteral(char c) {
contentStream.getOutputStream().writeInteger((int) c);
return this;
}
/**
* Outputs a {@code float} directly to the content.
*
* @param n the {@code float}
* @return current canvas.
*/
public PdfCanvas writeLiteral(float n) {
contentStream.getOutputStream().writeFloat(n);
return this;
}
/**
* Please, use this method with caution and only if you know what you are doing.
* Manipulating with underlying stream object of canvas could lead to corruption of it's data.
*
* @return the content stream to which this canvas object writes.
*/
public PdfStream getContentStream() {
return contentStream;
}
/**
* Adds {@code PdfImageXObject} to canvas.
*
* @param imageXObject the {@code PdfImageXObject} object
* @param a an element of the transformation matrix
* @param b an element of the transformation matrix
* @param c an element of the transformation matrix
* @param d an element of the transformation matrix
* @param e an element of the transformation matrix
* @param f an element of the transformation matrix
*/
protected void addInlineImage(PdfImageXObject imageXObject, float a, float b, float c, float d, float e, float f) {
document.checkIsoConformance(imageXObject.getPdfObject(), IsoKey.INLINE_IMAGE, resources, contentStream);
saveState();
concatMatrix(a, b, c, d, e, f);
PdfOutputStream os = contentStream.getOutputStream();
os.writeBytes(BI);
byte[] imageBytes = imageXObject.getPdfObject().getBytes(false);
for (Map.Entry entry : imageXObject.getPdfObject().entrySet()) {
PdfName key = entry.getKey();
if (!PdfName.Type.equals(key) && !PdfName.Subtype.equals(key) && !PdfName.Length.equals(key)) {
os.write(entry.getKey()).writeSpace();
os.write(entry.getValue()).writeNewLine();
}
}
if (document.getPdfVersion().compareTo(PdfVersion.PDF_2_0) >= 0) {
os.write(PdfName.Length).writeSpace();
os.write(new PdfNumber(imageBytes.length)).writeNewLine();
}
os.writeBytes(ID);
os.writeBytes(imageBytes).writeNewLine().writeBytes(EI).writeNewLine();
restoreState();
}
/**
* Adds {@link PdfFormXObject} to canvas.
*
* @param form the formXObject to add
* @param a an element of the transformation matrix
* @param b an element of the transformation matrix
* @param c an element of the transformation matrix
* @param d an element of the transformation matrix
* @param e an element of the transformation matrix
* @param f an element of the transformation matrix
* @param writeIdentityMatrix true if the matrix is written in any case, otherwise if the
* {@link #isIdentityMatrix(float, float, float, float, float, float)} method indicates
* that the matrix is identity, the matrix will not be written
* @return current canvas
*/
private PdfCanvas addFormWithTransformationMatrix(PdfFormXObject form, float a, float b, float c,
float d, float e, float f, boolean writeIdentityMatrix) {
saveState();
if (writeIdentityMatrix || !PdfCanvas.isIdentityMatrix(a, b, c, d, e, f)) {
concatMatrix(a, b, c, d, e, f);
}
PdfName name = resources.addForm(form);
contentStream.getOutputStream().write(name).writeSpace().writeBytes(Do);
restoreState();
return this;
}
/**
* Adds {@link PdfFormXObject} to the specified position.
*
* @param form the formXObject to add
* @param x the horizontal position of the formXObject
* @param y the vertical position of the formXObject
* @return the current canvas
*/
private PdfCanvas addFormAt(PdfFormXObject form, float x, float y) {
Rectangle bBox = PdfFormXObject.calculateBBoxMultipliedByMatrix(form);
Vector bBoxMin = new Vector(bBox.getLeft(), bBox.getBottom(), 1);
Vector bBoxMax = new Vector(bBox.getRight(), bBox.getTop(), 1);
Vector rectMin = new Vector(x, y, 1);
Vector rectMax = new Vector(x + bBoxMax.get(Vector.I1) - bBoxMin.get(Vector.I1),
y + bBoxMax.get(Vector.I2) - bBoxMin.get(Vector.I2), 1);
float[] result = PdfCanvas.calculateTransformationMatrix(rectMin, rectMax, bBoxMin, bBoxMax);
return addFormWithTransformationMatrix(form, result[0], result[1], result[2], result[3], result[4], result[5], false);
}
/**
* Adds {@link PdfFormXObject} fitted into specific rectangle on canvas.
*
* @param form the formXObject to add
* @param rect the rectangle in which the formXObject will be fitted
* @return the current canvas
*/
private PdfCanvas addFormFittedIntoRectangle(PdfFormXObject form, Rectangle rect) {
Rectangle bBox = PdfFormXObject.calculateBBoxMultipliedByMatrix(form);
Vector bBoxMin = new Vector(bBox.getLeft(), bBox.getBottom(), 1);
Vector bBoxMax = new Vector(bBox.getRight(), bBox.getTop(), 1);
Vector rectMin = new Vector(rect.getLeft(), rect.getBottom(), 1);
Vector rectMax = new Vector(rect.getRight(), rect.getTop(), 1);
float[] result = PdfCanvas.calculateTransformationMatrix(rectMin, rectMax, bBoxMin, bBoxMax);
return addFormWithTransformationMatrix(form, result[0], result[1], result[2], result[3], result[4], result[5], false);
}
/**
* Adds {@link PdfXObject} to canvas.
*
* @param xObject the xObject to add
* @param a an element of the transformation matrix
* @param b an element of the transformation matrix
* @param c an element of the transformation matrix
* @param d an element of the transformation matrix
* @param e an element of the transformation matrix
* @param f an element of the transformation matrix
* @return current canvas
*/
private PdfCanvas addImageWithTransformationMatrix(PdfXObject xObject, float a, float b, float c, float d, float e, float f) {
saveState();
concatMatrix(a, b, c, d, e, f);
PdfName name;
if (xObject instanceof PdfImageXObject) {
name = resources.addImage((PdfImageXObject) xObject);
} else {
name = resources.addImage(xObject.getPdfObject());
}
contentStream.getOutputStream().write(name).writeSpace().writeBytes(Do);
restoreState();
return this;
}
/**
* Adds {@link PdfImageXObject} to the specified position.
*
* @param image the imageXObject to add
* @param x the horizontal position of the imageXObject
* @param y the vertical position of the imageXObject
* @return the current canvas
*/
private PdfCanvas addImageAt(PdfImageXObject image, float x, float y) {
return addImageWithTransformationMatrix(image, image.getWidth(), 0, 0, image.getHeight(), x, y);
}
/**
* Adds {@link PdfImageXObject} fitted into specific rectangle on canvas.
*
* @param image the imageXObject to add
* @param rect the rectangle in which the imageXObject will be fitted
* @return current canvas
*/
private PdfCanvas addImageFittedIntoRectangle(PdfImageXObject image, Rectangle rect) {
return addImageWithTransformationMatrix(image, rect.getWidth(), 0, 0, rect.getHeight(), rect.getX(), rect.getY());
}
private PdfStream ensureStreamDataIsReadyToBeProcessed(PdfStream stream) {
if (!stream.isFlushed()) {
if (stream.getOutputStream() == null || stream.containsKey(PdfName.Filter)) {
try {
stream.setData(stream.getBytes());
} catch (Exception ex) {
// ignore
}
}
}
return stream;
}
/**
* A helper to insert into the content stream the {@code text}
* converted to bytes according to the font's encoding.
*
* @param text the text to write.
*/
private void showTextInt(String text) {
document.checkIsoConformance(currentGs, IsoKey.FONT_GLYPHS, null, contentStream);
if (currentGs.getFont() == null) {
throw new PdfException(
KernelExceptionMessageConstant.FONT_AND_SIZE_MUST_BE_SET_BEFORE_WRITING_ANY_TEXT, currentGs);
}
document.checkIsoConformance(text, IsoKey.FONT, null, null, currentGs.getFont());
currentGs.getFont().writeText(text, contentStream.getOutputStream());
}
private void addToPropertiesAndBeginLayer(IPdfOCG layer) {
PdfName name = resources.addProperties(layer.getPdfObject());
contentStream.getOutputStream().write(PdfName.OC).writeSpace()
.write(name).writeSpace().writeBytes(BDC).writeNewLine();
}
private Color createColor(PdfColorSpace colorSpace, float[] colorValue, PdfPattern pattern) {
if (colorSpace instanceof PdfSpecialCs.UncoloredTilingPattern) {
return new PatternColor((PdfPattern.Tiling) pattern, ((PdfSpecialCs.UncoloredTilingPattern) colorSpace).getUnderlyingColorSpace(), colorValue);
} else if (colorSpace instanceof PdfSpecialCs.Pattern) {
return new PatternColor(pattern);
}
return Color.makeColor(colorSpace, colorValue);
}
private PdfArray getDashPatternArray(float phase) {
return getDashPatternArray(null, phase);
}
private PdfArray getDashPatternArray(float[] dashArray, float phase) {
PdfArray dashPatternArray = new PdfArray();
PdfArray dArray = new PdfArray();
if (dashArray != null) {
for (float fl : dashArray) {
dArray.add(new PdfNumber(fl));
}
}
dashPatternArray.add(dArray);
dashPatternArray.add(new PdfNumber(phase));
return dashPatternArray;
}
private void applyRotation(PdfPage page) {
Rectangle rectangle = page.getPageSizeWithRotation();
int rotation = page.getRotation();
switch (rotation) {
case 90:
concatMatrix(0, 1, -1, 0, rectangle.getTop(), 0);
break;
case 180:
concatMatrix(-1, 0, 0, -1, rectangle.getRight(), rectangle.getTop());
break;
case 270:
concatMatrix(0, -1, 1, 0, 0, rectangle.getRight());
break;
}
}
private PdfCanvas drawArc(double x1, double y1, double x2, double y2,
double startAng, double extent, boolean continuous) {
List ar = bezierArc(x1, y1, x2, y2, startAng, extent);
if (ar.isEmpty()) {
return this;
}
double[] pt = ar.get(0);
if (continuous) {
lineTo(pt[0], pt[1]);
} else {
moveTo(pt[0], pt[1]);
}
for (int index = 0; index < ar.size(); ++index) {
pt = ar.get(index);
curveTo(pt[2], pt[3], pt[4], pt[5], pt[6], pt[7]);
}
return this;
}
private void checkDefaultDeviceGrayBlackColor(CheckColorMode checkColorMode) {
if (defaultDeviceGrayBlackColorCheckRequired) {
// It's enough to check DeviceGray.BLACK once for fill color or stroke color
// But it's still important to do not check fill color if it's not used and vice versa
if (currentGs.getFillColor() == DeviceGray.BLACK &&
(checkColorMode == CheckColorMode.FILL || checkColorMode == CheckColorMode.FILL_AND_STROKE)) {
document.checkIsoConformance(currentGs, IsoKey.FILL_COLOR, resources, contentStream);
defaultDeviceGrayBlackColorCheckRequired = false;
} else if (currentGs.getStrokeColor() == DeviceGray.BLACK &&
(checkColorMode == CheckColorMode.STROKE || checkColorMode == CheckColorMode.FILL_AND_STROKE)) {
document.checkIsoConformance(currentGs, IsoKey.STROKE_COLOR, resources, contentStream);
defaultDeviceGrayBlackColorCheckRequired = false;
} else {
// Nothing
}
}
}
private CheckColorMode getColorKeyForText() {
switch (currentGs.getTextRenderingMode()) {
case PdfCanvasConstants.TextRenderingMode.FILL:
case PdfCanvasConstants.TextRenderingMode.FILL_CLIP:
return CheckColorMode.FILL;
case PdfCanvasConstants.TextRenderingMode.STROKE:
case PdfCanvasConstants.TextRenderingMode.STROKE_CLIP:
return CheckColorMode.STROKE;
case PdfCanvasConstants.TextRenderingMode.FILL_STROKE:
case PdfCanvasConstants.TextRenderingMode.FILL_STROKE_CLIP:
return CheckColorMode.FILL_AND_STROKE;
default:
return CheckColorMode.NONE;
}
}
private static PdfStream getPageStream(PdfPage page) {
PdfStream stream = page.getLastContentStream();
return stream == null || stream.getOutputStream() == null || stream.containsKey(PdfName.Filter) ? page.newContentStreamAfter() : stream;
}
private static List iteratorToList(Iterator iterator) {
List list = new ArrayList<>();
while (iterator.hasNext()) {
list.add(iterator.next());
}
return list;
}
private static float[] calculateTransformationMatrix(Vector expectedMin, Vector expectedMax, Vector actualMin, Vector actualMax) {
// Calculates a matrix such that if you multiply the actual vertices by it, you get the expected vertices
float[] result = new float[6];
result[0] = (expectedMin.get(Vector.I1) - expectedMax.get(Vector.I1)) / (actualMin.get(Vector.I1) - actualMax.get(Vector.I1));
result[1] = 0;
result[2] = 0;
result[3] = (expectedMin.get(Vector.I2) - expectedMax.get(Vector.I2)) / (actualMin.get(Vector.I2) - actualMax.get(Vector.I2));
result[4] = expectedMin.get(Vector.I1) - actualMin.get(Vector.I1) * result[0];
result[5] = expectedMin.get(Vector.I2) - actualMin.get(Vector.I2) * result[3];
return result;
}
private static boolean isIdentityMatrix(float a, float b, float c, float d, float e, float f) {
return Math.abs(1 - a) < IDENTITY_MATRIX_EPS && Math.abs(b) < IDENTITY_MATRIX_EPS && Math.abs(c) < IDENTITY_MATRIX_EPS &&
Math.abs(1 - d) < IDENTITY_MATRIX_EPS && Math.abs(e) < IDENTITY_MATRIX_EPS && Math.abs(f) < IDENTITY_MATRIX_EPS;
}
private enum CheckColorMode {
NONE,
FILL,
STROKE,
FILL_AND_STROKE
}
}