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/*
* Copyright (c) 2009 Albert Kurucz.
*
* This file, TextUtilities.java is part of JTStand.
*
* JTStand is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* JTStand 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with GTStand. If not, see String. Line breaks
* are added where the String contains '\n' characters.
*
* @param text the text.
* @param font the font.
* @param paint the paint.
*
* @return A text block.
*/
public static TextBlock createTextBlock(final String text, final Font font,
final Paint paint) {
if (text == null) {
throw new IllegalArgumentException("Null 'text' argument.");
}
final TextBlock result = new TextBlock();
String input = text;
boolean moreInputToProcess = (text.length() > 0);
final int start = 0;
while (moreInputToProcess) {
final int index = input.indexOf("\n");
if (index > start) {
final String line = input.substring(start, index);
if (index < input.length() - 1) {
result.addLine(line, font, paint);
input = input.substring(index + 1);
}
else {
moreInputToProcess = false;
}
}
else if (index == start) {
if (index < input.length() - 1) {
input = input.substring(index + 1);
}
else {
moreInputToProcess = false;
}
}
else {
result.addLine(input, font, paint);
moreInputToProcess = false;
}
}
return result;
}
/**
* Creates a new text block from the given string, breaking the
* text into lines so that the maxWidth value is
* respected.
*
* @param text the text.
* @param font the font.
* @param paint the paint.
* @param maxWidth the maximum width for each line.
* @param measurer the text measurer.
*
* @return A text block.
*/
public static TextBlock createTextBlock(final String text, final Font font,
final Paint paint, final float maxWidth,
final TextMeasurer measurer) {
return createTextBlock(text, font, paint, maxWidth, Integer.MAX_VALUE,
measurer);
}
/**
* Creates a new text block from the given string, breaking the
* text into lines so that the maxWidth value is
* respected.
*
* @param text the text.
* @param font the font.
* @param paint the paint.
* @param maxWidth the maximum width for each line.
* @param maxLines the maximum number of lines.
* @param measurer the text measurer.
*
* @return A text block.
*/
public static TextBlock createTextBlock(final String text, final Font font,
final Paint paint, final float maxWidth, final int maxLines,
final TextMeasurer measurer) {
final TextBlock result = new TextBlock();
final BreakIterator iterator = BreakIterator.getLineInstance();
iterator.setText(text);
int current = 0;
int lines = 0;
final int length = text.length();
while (current < length && lines < maxLines) {
final int next = nextLineBreak(text, current, maxWidth, iterator,
measurer);
if (next == BreakIterator.DONE) {
result.addLine(text.substring(current), font, paint);
return result;
}
result.addLine(text.substring(current, next), font, paint);
lines++;
current = next;
while (current < text.length()&& text.charAt(current) == '\n') {
current++;
}
}
if (current < length) {
final TextLine lastLine = result.getLastLine();
final TextFragment lastFragment = lastLine.getLastTextFragment();
final String oldStr = lastFragment.getText();
String newStr = "...";
if (oldStr.length() > 3) {
newStr = oldStr.substring(0, oldStr.length() - 3) + "...";
}
lastLine.removeFragment(lastFragment);
final TextFragment newFragment = new TextFragment(newStr,
lastFragment.getFont(), lastFragment.getPaint());
lastLine.addFragment(newFragment);
}
return result;
}
/**
* Returns the character index of the next line break.
*
* @param text the text (null not permitted).
* @param start the start index.
* @param width the target display width.
* @param iterator the word break iterator.
* @param measurer the text measurer.
*
* @return The index of the next line break.
*/
private static int nextLineBreak(final String text, final int start,
final float width, final BreakIterator iterator,
final TextMeasurer measurer) {
// this method is (loosely) based on code in JFreeReport's
// TextParagraph class
int current = start;
int end;
float x = 0.0f;
boolean firstWord = true;
int newline = text.indexOf('\n', start);
if (newline < 0) {
newline = Integer.MAX_VALUE;
}
while (((end = iterator.next()) != BreakIterator.DONE)) {
x += measurer.getStringWidth(text, current, end);
if (x > width) {
if (firstWord) {
while (measurer.getStringWidth(text, start, end) > width) {
end--;
if (end <= start) {
return end;
}
}
return end;
}
else {
end = iterator.previous();
return end;
}
}
else {
if (end > newline) {
return newline;
}
}
// we found at least one word that fits ...
firstWord = false;
current = end;
}
return BreakIterator.DONE;
}
/**
* Returns the bounds for the specified text.
*
* @param text the text (null permitted).
* @param g2 the graphics context (not null).
* @param fm the font metrics (not null).
*
* @return The text bounds (null if the text
* argument is null).
*/
public static Rectangle2D getTextBounds(final String text,
final Graphics2D g2, final FontMetrics fm) {
final Rectangle2D bounds;
if (TextUtilities.useFontMetricsGetStringBounds) {
bounds = fm.getStringBounds(text, g2);
// getStringBounds() can return incorrect height for some Unicode
// characters...see bug parade 6183356, let's replace it with
// something correct
LineMetrics lm = fm.getFont().getLineMetrics(text,
g2.getFontRenderContext());
bounds.setRect(bounds.getX(), bounds.getY(), bounds.getWidth(),
lm.getHeight());
}
else {
final double width = fm.stringWidth(text);
final double height = fm.getHeight();
if (logger.isDebugEnabled()) {
logger.debug("Height = " + height);
}
bounds = new Rectangle2D.Double(0.0, -fm.getAscent(), width,
height);
}
return bounds;
}
/**
* Draws a string such that the specified anchor point is aligned to the
* given (x, y) location.
*
* @param text the text.
* @param g2 the graphics device.
* @param x the x coordinate (Java 2D).
* @param y the y coordinate (Java 2D).
* @param anchor the anchor location.
*
* @return The text bounds (adjusted for the text position).
*/
public static Rectangle2D drawAlignedString(final String text,
final Graphics2D g2, final float x, final float y,
final TextAnchor anchor) {
final Rectangle2D textBounds = new Rectangle2D.Double();
final float[] adjust = deriveTextBoundsAnchorOffsets(g2, text, anchor,
textBounds);
// adjust text bounds to match string position
textBounds.setRect(x + adjust[0], y + adjust[1] + adjust[2],
textBounds.getWidth(), textBounds.getHeight());
g2.drawString(text, x + adjust[0], y + adjust[1]);
return textBounds;
}
/**
* A utility method that calculates the anchor offsets for a string.
* Normally, the (x, y) coordinate for drawing text is a point on the
* baseline at the left of the text string. If you add these offsets to
* (x, y) and draw the string, then the anchor point should coincide with
* the (x, y) point.
*
* @param g2 the graphics device (not null).
* @param text the text.
* @param anchor the anchor point.
* @param textBounds the text bounds (if not null, this
* object will be updated by this method to match the
* string bounds).
*
* @return The offsets.
*/
private static float[] deriveTextBoundsAnchorOffsets(final Graphics2D g2,
final String text, final TextAnchor anchor,
final Rectangle2D textBounds) {
final float[] result = new float[3];
final FontRenderContext frc = g2.getFontRenderContext();
final Font f = g2.getFont();
final FontMetrics fm = g2.getFontMetrics(f);
final Rectangle2D bounds = TextUtilities.getTextBounds(text, g2, fm);
final LineMetrics metrics = f.getLineMetrics(text, frc);
final float ascent = metrics.getAscent();
result[2] = -ascent;
final float halfAscent = ascent / 2.0f;
final float descent = metrics.getDescent();
final float leading = metrics.getLeading();
float xAdj = 0.0f;
float yAdj = 0.0f;
if (anchor == TextAnchor.TOP_CENTER
|| anchor == TextAnchor.CENTER
|| anchor == TextAnchor.BOTTOM_CENTER
|| anchor == TextAnchor.BASELINE_CENTER
|| anchor == TextAnchor.HALF_ASCENT_CENTER) {
xAdj = (float) -bounds.getWidth() / 2.0f;
}
else if (anchor == TextAnchor.TOP_RIGHT
|| anchor == TextAnchor.CENTER_RIGHT
|| anchor == TextAnchor.BOTTOM_RIGHT
|| anchor == TextAnchor.BASELINE_RIGHT
|| anchor == TextAnchor.HALF_ASCENT_RIGHT) {
xAdj = (float) -bounds.getWidth();
}
if (anchor == TextAnchor.TOP_LEFT
|| anchor == TextAnchor.TOP_CENTER
|| anchor == TextAnchor.TOP_RIGHT) {
yAdj = -descent - leading + (float) bounds.getHeight();
}
else if (anchor == TextAnchor.HALF_ASCENT_LEFT
|| anchor == TextAnchor.HALF_ASCENT_CENTER
|| anchor == TextAnchor.HALF_ASCENT_RIGHT) {
yAdj = halfAscent;
}
else if (anchor == TextAnchor.CENTER_LEFT
|| anchor == TextAnchor.CENTER
|| anchor == TextAnchor.CENTER_RIGHT) {
yAdj = -descent - leading + (float) (bounds.getHeight() / 2.0);
}
else if (anchor == TextAnchor.BASELINE_LEFT
|| anchor == TextAnchor.BASELINE_CENTER
|| anchor == TextAnchor.BASELINE_RIGHT) {
yAdj = 0.0f;
}
else if (anchor == TextAnchor.BOTTOM_LEFT
|| anchor == TextAnchor.BOTTOM_CENTER
|| anchor == TextAnchor.BOTTOM_RIGHT) {
yAdj = -metrics.getDescent() - metrics.getLeading();
}
if (textBounds != null) {
textBounds.setRect(bounds);
}
result[0] = xAdj;
result[1] = yAdj;
return result;
}
/**
* Sets the flag that controls whether or not a workaround is used for
* drawing rotated strings. The related bug is on Sun's bug parade
* (id 4312117) and the workaround involves using a TextLayout
* instance to draw the text instead of calling the
* drawString() method in the Graphics2D class.
*
* @param use the new flag value.
*/
public static void setUseDrawRotatedStringWorkaround(final boolean use) {
useDrawRotatedStringWorkaround = use;
}
/**
* A utility method for drawing rotated text.
*
* A common rotation is -Math.PI/2 which draws text 'vertically' (with the
* top of the characters on the left).
*
* @param text the text.
* @param g2 the graphics device.
* @param angle the angle of the (clockwise) rotation (in radians).
* @param x the x-coordinate.
* @param y the y-coordinate.
*/
public static void drawRotatedString(final String text, final Graphics2D g2,
final double angle, final float x, final float y) {
drawRotatedString(text, g2, x, y, angle, x, y);
}
/**
* A utility method for drawing rotated text.
*
* A common rotation is -Math.PI/2 which draws text 'vertically' (with the
* top of the characters on the left).
*
* @param text the text.
* @param g2 the graphics device.
* @param textX the x-coordinate for the text (before rotation).
* @param textY the y-coordinate for the text (before rotation).
* @param angle the angle of the (clockwise) rotation (in radians).
* @param rotateX the point about which the text is rotated.
* @param rotateY the point about which the text is rotated.
*/
public static void drawRotatedString(final String text, final Graphics2D g2,
final float textX, final float textY, final double angle,
final float rotateX, final float rotateY) {
if ((text == null) || (text.equals(""))) {
return;
}
final AffineTransform saved = g2.getTransform();
// apply the rotation...
final AffineTransform rotate = AffineTransform.getRotateInstance(
angle, rotateX, rotateY);
g2.transform(rotate);
if (useDrawRotatedStringWorkaround) {
// workaround for JDC bug ID 4312117 and others...
final TextLayout tl = new TextLayout(text, g2.getFont(),
g2.getFontRenderContext());
tl.draw(g2, textX, textY);
}
else {
// replaces this code...
g2.drawString(text, textX, textY);
}
g2.setTransform(saved);
}
/**
* Draws a string that is aligned by one anchor point and rotated about
* another anchor point.
*
* @param text the text.
* @param g2 the graphics device.
* @param x the x-coordinate for positioning the text.
* @param y the y-coordinate for positioning the text.
* @param textAnchor the text anchor.
* @param angle the rotation angle.
* @param rotationX the x-coordinate for the rotation anchor point.
* @param rotationY the y-coordinate for the rotation anchor point.
*/
public static void drawRotatedString(final String text,
final Graphics2D g2, final float x, final float y,
final TextAnchor textAnchor, final double angle,
final float rotationX, final float rotationY) {
if (text == null || text.equals("")) {
return;
}
final float[] textAdj = deriveTextBoundsAnchorOffsets(g2, text,
textAnchor);
drawRotatedString(text, g2, x + textAdj[0], y + textAdj[1], angle,
rotationX, rotationY);
}
/**
* Draws a string that is aligned by one anchor point and rotated about
* another anchor point.
*
* @param text the text.
* @param g2 the graphics device.
* @param x the x-coordinate for positioning the text.
* @param y the y-coordinate for positioning the text.
* @param textAnchor the text anchor.
* @param angle the rotation angle (in radians).
* @param rotationAnchor the rotation anchor.
*/
public static void drawRotatedString(final String text, final Graphics2D g2,
final float x, final float y, final TextAnchor textAnchor,
final double angle, final TextAnchor rotationAnchor) {
if (text == null || text.equals("")) {
return;
}
final float[] textAdj = deriveTextBoundsAnchorOffsets(g2, text,
textAnchor);
final float[] rotateAdj = deriveRotationAnchorOffsets(g2, text,
rotationAnchor);
drawRotatedString(text, g2, x + textAdj[0], y + textAdj[1],
angle, x + textAdj[0] + rotateAdj[0],
y + textAdj[1] + rotateAdj[1]);
}
/**
* Returns a shape that represents the bounds of the string after the
* specified rotation has been applied.
*
* @param text the text (null permitted).
* @param g2 the graphics device.
* @param x the x coordinate for the anchor point.
* @param y the y coordinate for the anchor point.
* @param textAnchor the text anchor.
* @param angle the angle.
* @param rotationAnchor the rotation anchor.
*
* @return The bounds (possibly null).
*/
public static Shape calculateRotatedStringBounds(final String text,
final Graphics2D g2, final float x, final float y,
final TextAnchor textAnchor, final double angle,
final TextAnchor rotationAnchor) {
if (text == null || text.equals("")) {
return null;
}
final float[] textAdj = deriveTextBoundsAnchorOffsets(g2, text,
textAnchor);
if (logger.isDebugEnabled()) {
logger.debug("TextBoundsAnchorOffsets = " + textAdj[0] + ", "
+ textAdj[1]);
}
final float[] rotateAdj = deriveRotationAnchorOffsets(g2, text,
rotationAnchor);
if (logger.isDebugEnabled()) {
logger.debug("RotationAnchorOffsets = " + rotateAdj[0] + ", "
+ rotateAdj[1]);
}
final Shape result = calculateRotatedStringBounds(text, g2,
x + textAdj[0], y + textAdj[1], angle,
x + textAdj[0] + rotateAdj[0], y + textAdj[1] + rotateAdj[1]);
return result;
}
/**
* A utility method that calculates the anchor offsets for a string.
* Normally, the (x, y) coordinate for drawing text is a point on the
* baseline at the left of the text string. If you add these offsets to
* (x, y) and draw the string, then the anchor point should coincide with
* the (x, y) point.
*
* @param g2 the graphics device (not null).
* @param text the text.
* @param anchor the anchor point.
*
* @return The offsets.
*/
private static float[] deriveTextBoundsAnchorOffsets(final Graphics2D g2,
final String text, final TextAnchor anchor) {
final float[] result = new float[2];
final FontRenderContext frc = g2.getFontRenderContext();
final Font f = g2.getFont();
final FontMetrics fm = g2.getFontMetrics(f);
final Rectangle2D bounds = TextUtilities.getTextBounds(text, g2, fm);
final LineMetrics metrics = f.getLineMetrics(text, frc);
final float ascent = metrics.getAscent();
final float halfAscent = ascent / 2.0f;
final float descent = metrics.getDescent();
final float leading = metrics.getLeading();
float xAdj = 0.0f;
float yAdj = 0.0f;
if (anchor == TextAnchor.TOP_CENTER
|| anchor == TextAnchor.CENTER
|| anchor == TextAnchor.BOTTOM_CENTER
|| anchor == TextAnchor.BASELINE_CENTER
|| anchor == TextAnchor.HALF_ASCENT_CENTER) {
xAdj = (float) -bounds.getWidth() / 2.0f;
}
else if (anchor == TextAnchor.TOP_RIGHT
|| anchor == TextAnchor.CENTER_RIGHT
|| anchor == TextAnchor.BOTTOM_RIGHT
|| anchor == TextAnchor.BASELINE_RIGHT
|| anchor == TextAnchor.HALF_ASCENT_RIGHT) {
xAdj = (float) -bounds.getWidth();
}
if (anchor == TextAnchor.TOP_LEFT
|| anchor == TextAnchor.TOP_CENTER
|| anchor == TextAnchor.TOP_RIGHT) {
yAdj = -descent - leading + (float) bounds.getHeight();
}
else if (anchor == TextAnchor.HALF_ASCENT_LEFT
|| anchor == TextAnchor.HALF_ASCENT_CENTER
|| anchor == TextAnchor.HALF_ASCENT_RIGHT) {
yAdj = halfAscent;
}
else if (anchor == TextAnchor.CENTER_LEFT
|| anchor == TextAnchor.CENTER
|| anchor == TextAnchor.CENTER_RIGHT) {
yAdj = -descent - leading + (float) (bounds.getHeight() / 2.0);
}
else if (anchor == TextAnchor.BASELINE_LEFT
|| anchor == TextAnchor.BASELINE_CENTER
|| anchor == TextAnchor.BASELINE_RIGHT) {
yAdj = 0.0f;
}
else if (anchor == TextAnchor.BOTTOM_LEFT
|| anchor == TextAnchor.BOTTOM_CENTER
|| anchor == TextAnchor.BOTTOM_RIGHT) {
yAdj = -metrics.getDescent() - metrics.getLeading();
}
result[0] = xAdj;
result[1] = yAdj;
return result;
}
/**
* A utility method that calculates the rotation anchor offsets for a
* string. These offsets are relative to the text starting coordinate
* (BASELINE_LEFT).
*
* @param g2 the graphics device.
* @param text the text.
* @param anchor the anchor point.
*
* @return The offsets.
*/
private static float[] deriveRotationAnchorOffsets(final Graphics2D g2,
final String text, final TextAnchor anchor) {
final float[] result = new float[2];
final FontRenderContext frc = g2.getFontRenderContext();
final LineMetrics metrics = g2.getFont().getLineMetrics(text, frc);
final FontMetrics fm = g2.getFontMetrics();
final Rectangle2D bounds = TextUtilities.getTextBounds(text, g2, fm);
final float ascent = metrics.getAscent();
final float halfAscent = ascent / 2.0f;
final float descent = metrics.getDescent();
final float leading = metrics.getLeading();
float xAdj = 0.0f;
float yAdj = 0.0f;
if (anchor == TextAnchor.TOP_LEFT
|| anchor == TextAnchor.CENTER_LEFT
|| anchor == TextAnchor.BOTTOM_LEFT
|| anchor == TextAnchor.BASELINE_LEFT
|| anchor == TextAnchor.HALF_ASCENT_LEFT) {
xAdj = 0.0f;
}
else if (anchor == TextAnchor.TOP_CENTER
|| anchor == TextAnchor.CENTER
|| anchor == TextAnchor.BOTTOM_CENTER
|| anchor == TextAnchor.BASELINE_CENTER
|| anchor == TextAnchor.HALF_ASCENT_CENTER) {
xAdj = (float) bounds.getWidth() / 2.0f;
}
else if (anchor == TextAnchor.TOP_RIGHT
|| anchor == TextAnchor.CENTER_RIGHT
|| anchor == TextAnchor.BOTTOM_RIGHT
|| anchor == TextAnchor.BASELINE_RIGHT
|| anchor == TextAnchor.HALF_ASCENT_RIGHT) {
xAdj = (float) bounds.getWidth();
}
if (anchor == TextAnchor.TOP_LEFT
|| anchor == TextAnchor.TOP_CENTER
|| anchor == TextAnchor.TOP_RIGHT) {
yAdj = descent + leading - (float) bounds.getHeight();
}
else if (anchor == TextAnchor.CENTER_LEFT
|| anchor == TextAnchor.CENTER
|| anchor == TextAnchor.CENTER_RIGHT) {
yAdj = descent + leading - (float) (bounds.getHeight() / 2.0);
}
else if (anchor == TextAnchor.HALF_ASCENT_LEFT
|| anchor == TextAnchor.HALF_ASCENT_CENTER
|| anchor == TextAnchor.HALF_ASCENT_RIGHT) {
yAdj = -halfAscent;
}
else if (anchor == TextAnchor.BASELINE_LEFT
|| anchor == TextAnchor.BASELINE_CENTER
|| anchor == TextAnchor.BASELINE_RIGHT) {
yAdj = 0.0f;
}
else if (anchor == TextAnchor.BOTTOM_LEFT
|| anchor == TextAnchor.BOTTOM_CENTER
|| anchor == TextAnchor.BOTTOM_RIGHT) {
yAdj = metrics.getDescent() + metrics.getLeading();
}
result[0] = xAdj;
result[1] = yAdj;
return result;
}
/**
* Returns a shape that represents the bounds of the string after the
* specified rotation has been applied.
*
* @param text the text (null permitted).
* @param g2 the graphics device.
* @param textX the x coordinate for the text.
* @param textY the y coordinate for the text.
* @param angle the angle.
* @param rotateX the x coordinate for the rotation point.
* @param rotateY the y coordinate for the rotation point.
*
* @return The bounds (null if text is
*
null or has zero length).
*/
public static Shape calculateRotatedStringBounds(final String text,
final Graphics2D g2, final float textX, final float textY,
final double angle, final float rotateX, final float rotateY) {
if ((text == null) || (text.equals(""))) {
return null;
}
final FontMetrics fm = g2.getFontMetrics();
final Rectangle2D bounds = TextUtilities.getTextBounds(text, g2, fm);
final AffineTransform translate = AffineTransform.getTranslateInstance(
textX, textY);
final Shape translatedBounds = translate.createTransformedShape(bounds);
final AffineTransform rotate = AffineTransform.getRotateInstance(
angle, rotateX, rotateY);
final Shape result = rotate.createTransformedShape(translatedBounds);
return result;
}
/**
* Returns the flag that controls whether the FontMetrics.getStringBounds()
* method is used or not. If you are having trouble with label alignment
* or positioning, try changing the value of this flag.
*
* @return A boolean.
*/
public static boolean getUseFontMetricsGetStringBounds() {
return useFontMetricsGetStringBounds;
}
/**
* Sets the flag that controls whether the FontMetrics.getStringBounds()
* method is used or not. If you are having trouble with label alignment
* or positioning, try changing the value of this flag.
*
* @param use the flag.
*/
public static void setUseFontMetricsGetStringBounds(final boolean use) {
useFontMetricsGetStringBounds = use;
}
/**
* Returns the flag that controls whether or not a workaround is used for
* drawing rotated strings.
*
* @return A boolean.
*/
public static boolean isUseDrawRotatedStringWorkaround() {
return useDrawRotatedStringWorkaround;
}
}