org.apache.xmlgraphics.java2d.AbstractGraphics2D Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id: AbstractGraphics2D.java 1739071 2016-04-14 12:30:21Z ssteiner $ */
package org.apache.xmlgraphics.java2d;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Paint;
import java.awt.Polygon;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;
import java.awt.font.TextLayout;
import java.awt.geom.AffineTransform;
import java.awt.geom.Arc2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.awt.geom.NoninvertibleTransformException;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import java.awt.image.ImageObserver;
import java.text.AttributedCharacterIterator;
import java.util.Map;
// CSOFF: NeedBraces
// CSOFF: ParameterName
// CSOFF: WhitespaceAround
/**
* This extension of the java.awt.Graphics2D abstract class
* is still abstract, but it implements a lot of the Graphics2D
* method in a way that concrete implementations can reuse.
*
* This class uses a GraphicContext to store the state of
* its various attributes that control the rendering, such as the
* current Font, Paint or clip.
*
* Concrete implementations can focus on implementing the rendering
* methods, such as drawShape. As a convenience, rendering
* methods that can be expressed with other rendering methods (e.g.,
* drawRect can be expressed as draw(new Rectangle(..))),
* are implemented by AbstractGraphics2D
*
* @version $Id: AbstractGraphics2D.java 1739071 2016-04-14 12:30:21Z ssteiner $
* @see org.apache.xmlgraphics.java2d.GraphicContext
*
* Originally authored by Vincent Hardy.
*/
public abstract class AbstractGraphics2D extends Graphics2D implements Cloneable {
/**
* Current state of the Graphic Context. The GraphicsContext
* class manages the state of this Graphics2D graphic context
* attributes.
*/
protected GraphicContext gc;
/**
* Text handling strategy.
*/
protected boolean textAsShapes;
/**
* Protection agains infinite recursion
*/
protected boolean inPossibleRecursion;
/**
* @param textAsShapes if true, all text is turned into shapes in the
* convertion. No text is output.
*
*/
public AbstractGraphics2D(boolean textAsShapes) {
this.textAsShapes = textAsShapes;
}
/**
* Creates a new AbstractGraphics2D from an existing instance.
* @param g the AbstractGraphics2D whose properties should be copied
*/
public AbstractGraphics2D(AbstractGraphics2D g) {
this.gc = (GraphicContext)g.gc.clone();
this.gc.validateTransformStack();
this.textAsShapes = g.textAsShapes;
}
/**
* Translates the origin of the graphics context to the point
* (x, y) in the current coordinate system.
* Modifies this graphics context so that its new origin corresponds
* to the point (x, y) in this graphics context's
* original coordinate system. All coordinates used in subsequent
* rendering operations on this graphics context will be relative
* to this new origin.
* @param x the x coordinate.
* @param y the y coordinate.
*/
public void translate(int x, int y) {
gc.translate(x, y);
}
/**
* Gets this graphics context's current color.
* @return this graphics context's current color.
* @see java.awt.Color
* @see java.awt.Graphics#setColor
*/
public Color getColor() {
return gc.getColor();
}
/**
* Sets this graphics context's current color to the specified
* color. All subsequent graphics operations using this graphics
* context use this specified color.
* @param c the new rendering color.
* @see java.awt.Color
* @see java.awt.Graphics#getColor
*/
public void setColor(Color c) {
gc.setColor(c);
}
/**
* Sets the paint mode of this graphics context to overwrite the
* destination with this graphics context's current color.
* This sets the logical pixel operation function to the paint or
* overwrite mode. All subsequent rendering operations will
* overwrite the destination with the current color.
*/
public void setPaintMode() {
gc.setComposite(AlphaComposite.SrcOver);
}
/**
* Gets the current font.
* @return this graphics context's current font.
* @see java.awt.Font
* @see java.awt.Graphics#setFont
*/
public Font getFont() {
return gc.getFont();
}
/**
* Sets this graphics context's font to the specified font.
* All subsequent text operations using this graphics context
* use this font.
* @param font the font.
* @see java.awt.Graphics#getFont
*/
public void setFont(Font font) {
gc.setFont(font);
}
/**
* Returns the bounding rectangle of the current clipping area.
* This method refers to the user clip, which is independent of the
* clipping associated with device bounds and window visibility.
* If no clip has previously been set, or if the clip has been
* cleared using setClip(null), this method returns
* null.
* The coordinates in the rectangle are relative to the coordinate
* system origin of this graphics context.
* @return the bounding rectangle of the current clipping area,
* or null if no clip is set.
* @see java.awt.Graphics#getClip
* @see java.awt.Graphics#clipRect
* @see java.awt.Graphics#setClip(int, int, int, int)
* @see java.awt.Graphics#setClip(Shape)
* @since JDK1.1
*/
public Rectangle getClipBounds() {
return gc.getClipBounds();
}
/**
* Intersects the current clip with the specified rectangle.
* The resulting clipping area is the intersection of the current
* clipping area and the specified rectangle. If there is no
* current clipping area, either because the clip has never been
* set, or the clip has been cleared using setClip(null),
* the specified rectangle becomes the new clip.
* This method sets the user clip, which is independent of the
* clipping associated with device bounds and window visibility.
* This method can only be used to make the current clip smaller.
* To set the current clip larger, use any of the setClip methods.
* Rendering operations have no effect outside of the clipping area.
* @param x the x coordinate of the rectangle to intersect the clip with
* @param y the y coordinate of the rectangle to intersect the clip with
* @param width the width of the rectangle to intersect the clip with
* @param height the height of the rectangle to intersect the clip with
* @see #setClip(int, int, int, int)
* @see #setClip(Shape)
*/
public void clipRect(int x, int y, int width, int height) {
gc.clipRect(x, y, width, height);
}
/**
* Sets the current clip to the rectangle specified by the given
* coordinates. This method sets the user clip, which is
* independent of the clipping associated with device bounds
* and window visibility.
* Rendering operations have no effect outside of the clipping area.
* @param x the x coordinate of the new clip rectangle.
* @param y the y coordinate of the new clip rectangle.
* @param width the width of the new clip rectangle.
* @param height the height of the new clip rectangle.
* @see java.awt.Graphics#clipRect
* @see java.awt.Graphics#setClip(Shape)
* @since JDK1.1
*/
public void setClip(int x, int y, int width, int height) {
gc.setClip(x, y, width, height);
}
/**
* Gets the current clipping area.
* This method returns the user clip, which is independent of the
* clipping associated with device bounds and window visibility.
* If no clip has previously been set, or if the clip has been
* cleared using setClip(null), this method returns
* null.
* @return a Shape object representing the
* current clipping area, or null if
* no clip is set.
* @see java.awt.Graphics#getClipBounds()
* @see java.awt.Graphics#clipRect(int, int, int, int)
* @see java.awt.Graphics#setClip(int, int, int, int)
* @see java.awt.Graphics#setClip(Shape)
* @since JDK1.1
*/
public Shape getClip() {
return gc.getClip();
}
/**
* Sets the current clipping area to an arbitrary clip shape.
* Not all objects that implement the Shape
* interface can be used to set the clip. The only
* Shape objects that are guaranteed to be
* supported are Shape objects that are
* obtained via the getClip method and via
* Rectangle objects. This method sets the
* user clip, which is independent of the clipping associated
* with device bounds and window visibility.
* @param clip the Shape to use to set the clip
* @see java.awt.Graphics#getClip()
* @see java.awt.Graphics#clipRect
* @see java.awt.Graphics#setClip(int, int, int, int)
* @since JDK1.1
*/
public void setClip(Shape clip) {
gc.setClip(clip);
}
/**
* Draws a line, using the current color, between the points
* (x1, y1) and (x2, y2)
* in this graphics context's coordinate system.
* @param x1 the first point's x coordinate.
* @param y1 the first point's y coordinate.
* @param x2 the second point's x coordinate.
* @param y2 the second point's y coordinate.
*/
public void drawLine(int x1, int y1, int x2, int y2) {
Line2D line = new Line2D.Float(x1, y1, x2, y2);
draw(line);
}
/**
* Fills the specified rectangle.
* The left and right edges of the rectangle are at
* x and x + width - 1.
* The top and bottom edges are at
* y and y + height - 1.
* The resulting rectangle covers an area
* width pixels wide by
* height pixels tall.
* The rectangle is filled using the graphics context's current color.
* @param x the x coordinate
* of the rectangle to be filled.
* @param y the y coordinate
* of the rectangle to be filled.
* @param width the width of the rectangle to be filled.
* @param height the height of the rectangle to be filled.
* @see java.awt.Graphics#clearRect
* @see java.awt.Graphics#drawRect
*/
public void fillRect(int x, int y, int width, int height) {
Rectangle rect = new Rectangle(x, y, width, height);
fill(rect);
}
public void drawRect(int x, int y, int width, int height) {
Rectangle rect = new Rectangle(x, y, width, height);
draw(rect);
}
/**
* Clears the specified rectangle by filling it with the background
* color of the current drawing surface. This operation does not
* use the current paint mode.
*
* Beginning with Java 1.1, the background color
* of offscreen images may be system dependent. Applications should
* use setColor followed by fillRect to
* ensure that an offscreen image is cleared to a specific color.
* @param x the x coordinate of the rectangle to clear.
* @param y the y coordinate of the rectangle to clear.
* @param width the width of the rectangle to clear.
* @param height the height of the rectangle to clear.
* @see java.awt.Graphics#fillRect(int, int, int, int)
* @see java.awt.Graphics#drawRect
* @see java.awt.Graphics#setColor(java.awt.Color)
* @see java.awt.Graphics#setPaintMode
* @see java.awt.Graphics#setXORMode(java.awt.Color)
*/
public void clearRect(int x, int y, int width, int height) {
Paint paint = gc.getPaint();
gc.setColor(gc.getBackground());
fillRect(x, y, width, height);
gc.setPaint(paint);
}
/**
* Draws an outlined round-cornered rectangle using this graphics
* context's current color. The left and right edges of the rectangle
* are at x and x + width,
* respectively. The top and bottom edges of the rectangle are at
* y and y + height.
* @param x the x coordinate of the rectangle to be drawn.
* @param y the y coordinate of the rectangle to be drawn.
* @param width the width of the rectangle to be drawn.
* @param height the height of the rectangle to be drawn.
* @param arcWidth the horizontal diameter of the arc
* at the four corners.
* @param arcHeight the vertical diameter of the arc
* at the four corners.
* @see java.awt.Graphics#fillRoundRect
*/
public void drawRoundRect(int x, int y, int width, int height,
int arcWidth, int arcHeight) {
RoundRectangle2D rect = new RoundRectangle2D.Float(x, y, width, height, arcWidth, arcHeight);
draw(rect);
}
/**
* Fills the specified rounded corner rectangle with the current color.
* The left and right edges of the rectangle
* are at x and x + width - 1,
* respectively. The top and bottom edges of the rectangle are at
* y and y + height - 1.
* @param x the x coordinate of the rectangle to be filled.
* @param y the y coordinate of the rectangle to be filled.
* @param width the width of the rectangle to be filled.
* @param height the height of the rectangle to be filled.
* @param arcWidth the horizontal diameter
* of the arc at the four corners.
* @param arcHeight the vertical diameter
* of the arc at the four corners.
* @see java.awt.Graphics#drawRoundRect
*/
public void fillRoundRect(int x, int y, int width, int height,
int arcWidth, int arcHeight) {
RoundRectangle2D rect = new RoundRectangle2D.Float(x, y, width, height, arcWidth, arcHeight);
fill(rect);
}
/**
* Draws the outline of an oval.
* The result is a circle or ellipse that fits within the
* rectangle specified by the x, y,
* width, and height arguments.
*
* The oval covers an area that is
* width + 1 pixels wide
* and height + 1 pixels tall.
* @param x the x coordinate of the upper left
* corner of the oval to be drawn.
* @param y the y coordinate of the upper left
* corner of the oval to be drawn.
* @param width the width of the oval to be drawn.
* @param height the height of the oval to be drawn.
* @see java.awt.Graphics#fillOval
*/
public void drawOval(int x, int y, int width, int height) {
Ellipse2D oval = new Ellipse2D.Float(x, y, width, height);
draw(oval);
}
/**
* Fills an oval bounded by the specified rectangle with the
* current color.
* @param x the x coordinate of the upper left corner
* of the oval to be filled.
* @param y the y coordinate of the upper left corner
* of the oval to be filled.
* @param width the width of the oval to be filled.
* @param height the height of the oval to be filled.
* @see java.awt.Graphics#drawOval
*/
public void fillOval(int x, int y, int width, int height) {
Ellipse2D oval = new Ellipse2D.Float(x, y, width, height);
fill(oval);
}
/**
* Draws the outline of a circular or elliptical arc
* covering the specified rectangle.
*
* The resulting arc begins at startAngle and extends
* for arcAngle degrees, using the current color.
* Angles are interpreted such that 0 degrees
* is at the 3 o'clock position.
* A positive value indicates a counter-clockwise rotation
* while a negative value indicates a clockwise rotation.
*
* The center of the arc is the center of the rectangle whose origin
* is (x, y) and whose size is specified by the
* width and height arguments.
*
* The resulting arc covers an area
* width + 1 pixels wide
* by height + 1 pixels tall.
*
* The angles are specified relative to the non-square extents of
* the bounding rectangle such that 45 degrees always falls on the
* line from the center of the ellipse to the upper right corner of
* the bounding rectangle. As a result, if the bounding rectangle is
* noticeably longer in one axis than the other, the angles to the
* start and end of the arc segment will be skewed farther along the
* longer axis of the bounds.
* @param x the x coordinate of the
* upper-left corner of the arc to be drawn.
* @param y the y coordinate of the
* upper-left corner of the arc to be drawn.
* @param width the width of the arc to be drawn.
* @param height the height of the arc to be drawn.
* @param startAngle the beginning angle.
* @param arcAngle the angular extent of the arc,
* relative to the start angle.
* @see java.awt.Graphics#fillArc
*/
public void drawArc(int x, int y, int width, int height,
int startAngle, int arcAngle) {
Arc2D arc = new Arc2D.Float(x, y, width, height, startAngle, arcAngle, Arc2D.OPEN);
draw(arc);
}
/**
* Fills a circular or elliptical arc covering the specified rectangle.
*
* The resulting arc begins at startAngle and extends
* for arcAngle degrees.
* Angles are interpreted such that 0 degrees
* is at the 3 o'clock position.
* A positive value indicates a counter-clockwise rotation
* while a negative value indicates a clockwise rotation.
*
* The center of the arc is the center of the rectangle whose origin
* is (x, y) and whose size is specified by the
* width and height arguments.
*
* The resulting arc covers an area
* width + 1 pixels wide
* by height + 1 pixels tall.
*
* The angles are specified relative to the non-square extents of
* the bounding rectangle such that 45 degrees always falls on the
* line from the center of the ellipse to the upper right corner of
* the bounding rectangle. As a result, if the bounding rectangle is
* noticeably longer in one axis than the other, the angles to the
* start and end of the arc segment will be skewed farther along the
* longer axis of the bounds.
* @param x the x coordinate of the
* upper-left corner of the arc to be filled.
* @param y the y coordinate of the
* upper-left corner of the arc to be filled.
* @param width the width of the arc to be filled.
* @param height the height of the arc to be filled.
* @param startAngle the beginning angle.
* @param arcAngle the angular extent of the arc,
* relative to the start angle.
* @see java.awt.Graphics#drawArc
*/
public void fillArc(int x, int y, int width, int height,
int startAngle, int arcAngle) {
Arc2D arc = new Arc2D.Float(x, y, width, height, startAngle, arcAngle, Arc2D.PIE);
fill(arc);
}
/**
* Draws a sequence of connected lines defined by
* arrays of x and y coordinates.
* Each pair of (x, y) coordinates defines a point.
* The figure is not closed if the first point
* differs from the last point.
* @param xPoints an array of x points
* @param yPoints an array of y points
* @param nPoints the total number of points
* @see java.awt.Graphics#drawPolygon(int[], int[], int)
* @since JDK1.1
*/
public void drawPolyline(int[] xPoints, int[] yPoints,
int nPoints) {
if (nPoints > 0) {
GeneralPath path = new GeneralPath();
path.moveTo(xPoints[0], yPoints[0]);
for (int i = 1; i < nPoints; i++) {
path.lineTo(xPoints[i], yPoints[i]);
}
draw(path);
}
}
/**
* Draws a closed polygon defined by
* arrays of x and y coordinates.
* Each pair of (x, y) coordinates defines a point.
*
* This method draws the polygon defined by nPoint line
* segments, where the first nPoint - 1
* line segments are line segments from
* (xPoints[i - 1], yPoints[i - 1])
* to (xPoints[i], yPoints[i]), for
* 1 ≤ i ≤ nPoints.
* The figure is automatically closed by drawing a line connecting
* the final point to the first point, if those points are different.
* @param xPoints a an array of x coordinates.
* @param yPoints a an array of y coordinates.
* @param nPoints a the total number of points.
* @see java.awt.Graphics#fillPolygon(int[],int[],int)
* @see java.awt.Graphics#drawPolyline
*/
public void drawPolygon(int[] xPoints, int[] yPoints,
int nPoints) {
Polygon polygon = new Polygon(xPoints, yPoints, nPoints);
draw(polygon);
}
/**
* Fills a closed polygon defined by
* arrays of x and y coordinates.
*
* This method draws the polygon defined by nPoint line
* segments, where the first nPoint - 1
* line segments are line segments from
* (xPoints[i - 1], yPoints[i - 1])
* to (xPoints[i], yPoints[i]), for
* 1 ≤ i ≤ nPoints.
* The figure is automatically closed by drawing a line connecting
* the final point to the first point, if those points are different.
*
* The area inside the polygon is defined using an
* even-odd fill rule, also known as the alternating rule.
* @param xPoints a an array of x coordinates.
* @param yPoints a an array of y coordinates.
* @param nPoints a the total number of points.
* @see java.awt.Graphics#drawPolygon(int[], int[], int)
*/
public void fillPolygon(int[] xPoints, int[] yPoints,
int nPoints) {
Polygon polygon = new Polygon(xPoints, yPoints, nPoints);
fill(polygon);
}
/**
* Draws the text given by the specified string, using this
* graphics context's current font and color. The baseline of the
* first character is at position (x, y) in this
* graphics context's coordinate system.
* @param str the string to be drawn.
* @param x the x coordinate.
* @param y the y coordinate.
* @see java.awt.Graphics#drawBytes
* @see java.awt.Graphics#drawChars
*/
public void drawString(String str, int x, int y) {
drawString(str, (float)x, (float)y);
}
/**
* Generic implementation for drawing attributed strings using TextLayout.
*
* @param iterator the iterator whose text is to be rendered
* @param x the x coordinate where the iterator's text is to be rendered
* @param y the y coordinate where the iterator's text is to be rendered
* @see java.awt.Graphics2D#drawString (java.text.AttributedCharacterIterator,
* float, float)
*/
public void drawString(AttributedCharacterIterator iterator, float x, float y) {
if (inPossibleRecursion) {
System.err.println("Called itself: drawString(AttributedCharacterIterator)");
} else {
inPossibleRecursion = true;
TextLayout layout = new TextLayout(iterator, getFontRenderContext());
layout.draw(this, x, y);
inPossibleRecursion = false;
}
}
/**
* Draws the text given by the specified iterator, using this
* graphics context's current color. The iterator has to specify a font
* for each character. The baseline of the
* first character is at position (x, y) in this
* graphics context's coordinate system.
* @param iterator the iterator whose text is to be drawn
* @param x the x coordinate.
* @param y the y coordinate.
* @see java.awt.Graphics#drawBytes
* @see java.awt.Graphics#drawChars
*/
public void drawString(AttributedCharacterIterator iterator,
int x, int y) {
drawString(iterator, (float)x, (float)y);
}
/**
* Draws as much of the specified image as is currently available.
* The image is drawn with its top-left corner at
* (x, y) in this graphics context's coordinate
* space. Transparent pixels are drawn in the specified
* background color.
*
* This operation is equivalent to filling a rectangle of the
* width and height of the specified image with the given color and then
* drawing the image on top of it, but possibly more efficient.
*
* This method returns immediately in all cases, even if the
* complete image has not yet been loaded, and it has not been dithered
* and converted for the current output device.
*
* If the image has not yet been completely loaded, then
* drawImage returns false. As more of
* the image becomes available, the process that draws the image notifies
* the specified image observer.
* @param img the specified image to be drawn.
* @param x the x coordinate.
* @param y the y coordinate.
* @param bgcolor the background color to paint under the
* non-opaque portions of the image.
* @param observer object to be notified as more of
* the image is converted.
* @see java.awt.Image
* @see java.awt.image.ImageObserver
* @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
*/
public boolean drawImage(Image img, int x, int y,
Color bgcolor,
ImageObserver observer) {
return drawImage(img, x, y, img.getWidth(null), img.getHeight(null),
bgcolor, observer);
}
/**
* Draws as much of the specified image as has already been scaled
* to fit inside the specified rectangle.
*
* The image is drawn inside the specified rectangle of this
* graphics context's coordinate space, and is scaled if
* necessary. Transparent pixels are drawn in the specified
* background color.
* This operation is equivalent to filling a rectangle of the
* width and height of the specified image with the given color and then
* drawing the image on top of it, but possibly more efficient.
*
* This method returns immediately in all cases, even if the
* entire image has not yet been scaled, dithered, and converted
* for the current output device.
* If the current output representation is not yet complete then
* drawImage returns false. As more of
* the image becomes available, the process that draws the image notifies
* the specified image observer.
*
* A scaled version of an image will not necessarily be
* available immediately just because an unscaled version of the
* image has been constructed for this output device. Each size of
* the image may be cached separately and generated from the original
* data in a separate image production sequence.
* @param img the specified image to be drawn.
* @param x the x coordinate.
* @param y the y coordinate.
* @param width the width of the rectangle.
* @param height the height of the rectangle.
* @param bgcolor the background color to paint under the
* non-opaque portions of the image.
* @param observer object to be notified as more of
* the image is converted.
* @see java.awt.Image
* @see java.awt.image.ImageObserver
* @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
*/
public boolean drawImage(Image img, int x, int y,
int width, int height,
Color bgcolor,
ImageObserver observer) {
Paint paint = gc.getPaint();
gc.setPaint(bgcolor);
fillRect(x, y, width, height);
gc.setPaint(paint);
drawImage(img, x, y, width, height, observer);
return true;
}
/**
* Draws as much of the specified area of the specified image as is
* currently available, scaling it on the fly to fit inside the
* specified area of the destination drawable surface. Transparent pixels
* do not affect whatever pixels are already there.
*
* This method returns immediately in all cases, even if the
* image area to be drawn has not yet been scaled, dithered, and converted
* for the current output device.
* If the current output representation is not yet complete then
* drawImage returns false. As more of
* the image becomes available, the process that draws the image notifies
* the specified image observer.
*
* This method always uses the unscaled version of the image
* to render the scaled rectangle and performs the required
* scaling on the fly. It does not use a cached, scaled version
* of the image for this operation. Scaling of the image from source
* to destination is performed such that the first coordinate
* of the source rectangle is mapped to the first coordinate of
* the destination rectangle, and the second source coordinate is
* mapped to the second destination coordinate. The subimage is
* scaled and flipped as needed to preserve those mappings.
* @param img the specified image to be drawn
* @param dx1 the x coordinate of the first corner of the
* destination rectangle.
* @param dy1 the y coordinate of the first corner of the
* destination rectangle.
* @param dx2 the x coordinate of the second corner of the
* destination rectangle.
* @param dy2 the y coordinate of the second corner of the
* destination rectangle.
* @param sx1 the x coordinate of the first corner of the
* source rectangle.
* @param sy1 the y coordinate of the first corner of the
* source rectangle.
* @param sx2 the x coordinate of the second corner of the
* source rectangle.
* @param sy2 the y coordinate of the second corner of the
* source rectangle.
* @param observer object to be notified as more of the image is
* scaled and converted.
* @see java.awt.Image
* @see java.awt.image.ImageObserver
* @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
* @since JDK1.1
*/
public boolean drawImage(Image img,
int dx1, int dy1, int dx2, int dy2,
int sx1, int sy1, int sx2, int sy2,
ImageObserver observer) {
BufferedImage src = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_ARGB);
Graphics2D g = src.createGraphics();
g.drawImage(img, 0, 0, null);
g.dispose();
src = src.getSubimage(sx1, sy1, sx2 - sx1, sy2 - sy1);
return drawImage(src, dx1, dy1, dx2 - dx1, dy2 - dy1, observer);
}
/**
* Draws as much of the specified area of the specified image as is
* currently available, scaling it on the fly to fit inside the
* specified area of the destination drawable surface.
*
* Transparent pixels are drawn in the specified background color.
* This operation is equivalent to filling a rectangle of the
* width and height of the specified image with the given color and then
* drawing the image on top of it, but possibly more efficient.
*
* This method returns immediately in all cases, even if the
* image area to be drawn has not yet been scaled, dithered, and converted
* for the current output device.
* If the current output representation is not yet complete then
* drawImage returns false. As more of
* the image becomes available, the process that draws the image notifies
* the specified image observer.
*
* This method always uses the unscaled version of the image
* to render the scaled rectangle and performs the required
* scaling on the fly. It does not use a cached, scaled version
* of the image for this operation. Scaling of the image from source
* to destination is performed such that the first coordinate
* of the source rectangle is mapped to the first coordinate of
* the destination rectangle, and the second source coordinate is
* mapped to the second destination coordinate. The subimage is
* scaled and flipped as needed to preserve those mappings.
* @param img the specified image to be drawn
* @param dx1 the x coordinate of the first corner of the
* destination rectangle.
* @param dy1 the y coordinate of the first corner of the
* destination rectangle.
* @param dx2 the x coordinate of the second corner of the
* destination rectangle.
* @param dy2 the y coordinate of the second corner of the
* destination rectangle.
* @param sx1 the x coordinate of the first corner of the
* source rectangle.
* @param sy1 the y coordinate of the first corner of the
* source rectangle.
* @param sx2 the x coordinate of the second corner of the
* source rectangle.
* @param sy2 the y coordinate of the second corner of the
* source rectangle.
* @param bgcolor the background color to paint under the
* non-opaque portions of the image.
* @param observer object to be notified as more of the image is
* scaled and converted.
* @see java.awt.Image
* @see java.awt.image.ImageObserver
* @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
* @since JDK1.1
*/
public boolean drawImage(Image img,
int dx1, int dy1, int dx2, int dy2,
int sx1, int sy1, int sx2, int sy2,
Color bgcolor,
ImageObserver observer) {
Paint paint = gc.getPaint();
gc.setPaint(bgcolor);
fillRect(dx1, dy1, dx2 - dx1, dy2 - dy1);
gc.setPaint(paint);
return drawImage(img, dx1, dy1, dx2, dy2, sx1, sy1, sx2, sy2, observer);
}
/**
* Renders an image, applying a transform from image space into user space
* before drawing.
* The transformation from user space into device space is done with
* the current Transform in the Graphics2D.
* The specified transformation is applied to the image before the
* transform attribute in the Graphics2D context is applied.
* The rendering attributes applied include the Clip,
* Transform, and Composite attributes.
* Note that no rendering is done if the specified transform is
* noninvertible.
* @param img the Image to be rendered
* @param xform the transformation from image space into user space
* @param obs the {@link ImageObserver}
* to be notified as more of the Image
* is converted
* @return true if the Image is
* fully loaded and completely rendered;
* false if the Image is still being loaded.
* @see #transform
* @see #setTransform
* @see #setComposite
* @see #clip
* @see #setClip(Shape)
*/
public boolean drawImage(Image img,
AffineTransform xform,
ImageObserver obs) {
boolean retVal = true;
if (xform == null) {
xform = new AffineTransform();
}
if (xform.getDeterminant() != 0) {
AffineTransform inverseTransform = null;
try {
inverseTransform = xform.createInverse();
} catch (NoninvertibleTransformException e) {
// Should never happen since we checked the
// matrix determinant
throw new RuntimeException(e);
}
gc.transform(xform);
retVal = drawImage(img, 0, 0, null);
gc.transform(inverseTransform);
} else {
AffineTransform savTransform = new AffineTransform(gc.getTransform());
gc.transform(xform);
retVal = drawImage(img, 0, 0, null);
gc.setTransform(savTransform);
}
return retVal;
}
/**
* Renders a BufferedImage that is
* filtered with a
* {@link BufferedImageOp}.
* The rendering attributes applied include the Clip,
* Transform
* and Composite attributes. This is equivalent to:
*
* img1 = op.filter(img, null);
* drawImage(img1, new AffineTransform(1f,0f,0f,1f,x,y), null);
*
* @param img the BufferedImage to be rendered
* @param op the filter to be applied to the image before rendering
* @param x the x coordinate in user space where the image is rendered
* @param y the y coordinate in user space where the image is rendered
* @see #transform
* @see #setTransform
* @see #setComposite
* @see #clip
* @see #setClip(Shape)
*/
public void drawImage(BufferedImage img,
BufferedImageOp op,
int x,
int y) {
img = op.filter(img, null);
drawImage(img, x, y, null);
}
/**
* Renders the text of the specified
* {@link GlyphVector} using
* the Graphics2D context's rendering attributes.
* The rendering attributes applied include the Clip,
* Transform, Paint, and
* Composite attributes. The GlyphVector
* specifies individual glyphs from a {@link Font}.
* The GlyphVector can also contain the glyph positions.
* This is the fastest way to render a set of characters to the
* screen.
*
* @param g the GlyphVector to be rendered
* @param x the x position in user space where the glyphs should be
* rendered
* @param y the y position in user space where the glyphs should be
* rendered
*
* @see java.awt.Font#createGlyphVector(FontRenderContext, char[])
* @see java.awt.font.GlyphVector
* @see #setPaint
* @see java.awt.Graphics#setColor
* @see #setTransform
* @see #setComposite
* @see #setClip(Shape)
*/
public void drawGlyphVector(GlyphVector g, float x, float y) {
Shape glyphOutline = g.getOutline(x, y);
fill(glyphOutline);
}
/**
* Checks whether or not the specified Shape intersects
* the specified {@link Rectangle}, which is in device
* space. If onStroke is false, this method checks
* whether or not the interior of the specified Shape
* intersects the specified Rectangle. If
* onStroke is true, this method checks
* whether or not the Stroke of the specified
* Shape outline intersects the specified
* Rectangle.
* The rendering attributes taken into account include the
* Clip, Transform, and Stroke
* attributes.
* @param rect the area in device space to check for a hit
* @param s the Shape to check for a hit
* @param onStroke flag used to choose between testing the
* stroked or the filled shape. If the flag is true, the
* Stroke oultine is tested. If the flag is
* false, the filled Shape is tested.
* @return true if there is a hit; false
* otherwise.
* @see #setStroke
* @see #fill(Shape)
* @see #draw(Shape)
* @see #transform
* @see #setTransform
* @see #clip
* @see #setClip(Shape)
*/
public boolean hit(Rectangle rect,
Shape s,
boolean onStroke) {
if (onStroke) {
s = gc.getStroke().createStrokedShape(s);
}
s = gc.getTransform().createTransformedShape(s);
return s.intersects(rect);
}
/**
* Sets the Composite for the Graphics2D context.
* The Composite is used in all drawing methods such as
* drawImage, drawString, draw,
* and fill. It specifies how new pixels are to be combined
* with the existing pixels on the graphics device during the rendering
* process.
* If this Graphics2D context is drawing to a
* Component on the display screen and the
* Composite is a custom object rather than an
* instance of the AlphaComposite class, and if
* there is a security manager, its checkPermission
* method is called with an AWTPermission("readDisplayPixels")
* permission.
* @param comp the Composite object to be used for rendering
* @throws SecurityException
* if a custom Composite object is being
* used to render to the screen and a security manager
* is set and its checkPermission method
* does not allow the operation.
* @see java.awt.Graphics#setXORMode
* @see java.awt.Graphics#setPaintMode
* @see java.awt.AlphaComposite
*/
public void setComposite(Composite comp) {
gc.setComposite(comp);
}
/**
* Sets the Paint attribute for the
* Graphics2D context. Calling this method
* with a null Paint object does
* not have any effect on the current Paint attribute
* of this Graphics2D.
* @param paint the Paint object to be used to generate
* color during the rendering process, or null
* @see java.awt.Graphics#setColor
*/
public void setPaint(Paint paint) {
gc.setPaint(paint);
}
/**
* Sets the Stroke for the Graphics2D context.
* @param s the Stroke object to be used to stroke a
* Shape during the rendering process
*/
public void setStroke(Stroke s) {
gc.setStroke(s);
}
/**
* Sets the value of a single preference for the rendering algorithms.
* Hint categories include controls for rendering quality and overall
* time/quality trade-off in the rendering process. Refer to the
* RenderingHints class for definitions of some common
* keys and values.
* @param hintKey the key of the hint to be set.
* @param hintValue the value indicating preferences for the specified
* hint category.
* @see RenderingHints
*/
public void setRenderingHint(RenderingHints.Key hintKey, Object hintValue) {
gc.setRenderingHint(hintKey, hintValue);
}
/**
* Returns the value of a single preference for the rendering algorithms.
* Hint categories include controls for rendering quality and overall
* time/quality trade-off in the rendering process. Refer to the
* RenderingHints class for definitions of some common
* keys and values.
* @param hintKey the key corresponding to the hint to get.
* @return an object representing the value for the specified hint key.
* Some of the keys and their associated values are defined in the
* RenderingHints class.
* @see RenderingHints
*/
public Object getRenderingHint(RenderingHints.Key hintKey) {
return gc.getRenderingHint(hintKey);
}
/**
* Replaces the values of all preferences for the rendering
* algorithms with the specified hints.
* The existing values for all rendering hints are discarded and
* the new set of known hints and values are initialized from the
* specified {@link Map} object.
* Hint categories include controls for rendering quality and
* overall time/quality trade-off in the rendering process.
* Refer to the RenderingHints class for definitions of
* some common keys and values.
* @param hints the rendering hints to be set
* @see RenderingHints
*/
public void setRenderingHints(Map hints) {
gc.setRenderingHints(hints);
}
/**
* Sets the values of an arbitrary number of preferences for the
* rendering algorithms.
* Only values for the rendering hints that are present in the
* specified Map object are modified.
* All other preferences not present in the specified
* object are left unmodified.
* Hint categories include controls for rendering quality and
* overall time/quality trade-off in the rendering process.
* Refer to the RenderingHints class for definitions of
* some common keys and values.
* @param hints the rendering hints to be set
* @see RenderingHints
*/
public void addRenderingHints(Map hints) {
gc.addRenderingHints(hints);
}
/**
* Gets the preferences for the rendering algorithms. Hint categories
* include controls for rendering quality and overall time/quality
* trade-off in the rendering process.
* Returns all of the hint key/value pairs that were ever specified in
* one operation. Refer to the
* RenderingHints class for definitions of some common
* keys and values.
* @return a reference to an instance of RenderingHints
* that contains the current preferences.
* @see RenderingHints
*/
public RenderingHints getRenderingHints() {
return gc.getRenderingHints();
}
/**
* Concatenates the current
* Graphics2D Transform
* with a translation transform.
* Subsequent rendering is translated by the specified
* distance relative to the previous position.
* This is equivalent to calling transform(T), where T is an
* AffineTransform represented by the following matrix:
*
* [ 1 0 tx ]
* [ 0 1 ty ]
* [ 0 0 1 ]
*
* @param tx the distance to translate along the x-axis
* @param ty the distance to translate along the y-axis
*/
public void translate(double tx, double ty) {
gc.translate(tx, ty);
}
/**
* Concatenates the current Graphics2D
* Transform with a rotation transform.
* Subsequent rendering is rotated by the specified radians relative
* to the previous origin.
* This is equivalent to calling transform(R), where R is an
* AffineTransform represented by the following matrix:
*
* [ cos(theta) -sin(theta) 0 ]
* [ sin(theta) cos(theta) 0 ]
* [ 0 0 1 ]
*
* Rotating with a positive angle theta rotates points on the positive
* x axis toward the positive y axis.
* @param theta the angle of rotation in radians
*/
public void rotate(double theta) {
gc.rotate(theta);
}
/**
* Concatenates the current Graphics2D
* Transform with a translated rotation
* transform. Subsequent rendering is transformed by a transform
* which is constructed by translating to the specified location,
* rotating by the specified radians, and translating back by the same
* amount as the original translation. This is equivalent to the
* following sequence of calls:
*
* translate(x, y);
* rotate(theta);
* translate(-x, -y);
*
* Rotating with a positive angle theta rotates points on the positive
* x axis toward the positive y axis.
* @param theta the angle of rotation in radians
* @param x the x coordinate of the origin of the rotation
* @param y the y coordinate of the origin of the rotation
*/
public void rotate(double theta, double x, double y) {
gc.rotate(theta, x, y);
}
/**
* Concatenates the current Graphics2D
* Transform with a scaling transformation
* Subsequent rendering is resized according to the specified scaling
* factors relative to the previous scaling.
* This is equivalent to calling transform(S), where S is an
* AffineTransform represented by the following matrix:
*
* [ sx 0 0 ]
* [ 0 sy 0 ]
* [ 0 0 1 ]
*
* @param sx the amount by which X coordinates in subsequent
* rendering operations are multiplied relative to previous
* rendering operations.
* @param sy the amount by which Y coordinates in subsequent
* rendering operations are multiplied relative to previous
* rendering operations.
*/
public void scale(double sx, double sy) {
gc.scale(sx, sy);
}
/**
* Concatenates the current Graphics2D
* Transform with a shearing transform.
* Subsequent renderings are sheared by the specified
* multiplier relative to the previous position.
* This is equivalent to calling transform(SH), where SH
* is an AffineTransform represented by the following
* matrix:
*
* [ 1 shx 0 ]
* [ shy 1 0 ]
* [ 0 0 1 ]
*
* @param shx the multiplier by which coordinates are shifted in
* the positive X axis direction as a function of their Y coordinate
* @param shy the multiplier by which coordinates are shifted in
* the positive Y axis direction as a function of their X coordinate
*/
public void shear(double shx, double shy) {
gc.shear(shx, shy);
}
/**
* Composes an AffineTransform object with the
* Transform in this Graphics2D according
* to the rule last-specified-first-applied. If the current
* Transform is Cx, the result of composition
* with Tx is a new Transform Cx'. Cx' becomes the
* current Transform for this Graphics2D.
* Transforming a point p by the updated Transform Cx' is
* equivalent to first transforming p by Tx and then transforming
* the result by the original Transform Cx. In other
* words, Cx'(p) = Cx(Tx(p)). A copy of the Tx is made, if necessary,
* so further modifications to Tx do not affect rendering.
* @param tx the AffineTransform object to be composed with
* the current Transform
* @see #setTransform
* @see AffineTransform
*/
public void transform(AffineTransform tx) {
gc.transform(tx);
}
/**
* Sets the Transform in the Graphics2D
* context.
* @param tx the AffineTransform object to be used in the
* rendering process
* @see #transform
* @see AffineTransform
*/
public void setTransform(AffineTransform tx) {
gc.setTransform(tx);
}
/**
* Returns a copy of the current Transform in the
* Graphics2D context.
* @return the current AffineTransform in the
* Graphics2D context.
* @see #transform
* @see #setTransform
*/
public AffineTransform getTransform() {
return gc.getTransform();
}
/**
* Returns the current Paint of the
* Graphics2D context.
* @return the current Graphics2D Paint,
* which defines a color or pattern.
* @see #setPaint
* @see java.awt.Graphics#setColor
*/
public Paint getPaint() {
return gc.getPaint();
}
/**
* Returns the current Composite in the
* Graphics2D context.
* @return the current Graphics2D Composite,
* which defines a compositing style.
* @see #setComposite
*/
public Composite getComposite() {
return gc.getComposite();
}
/**
* Sets the background color for the Graphics2D context.
* The background color is used for clearing a region.
* When a Graphics2D is constructed for a
* Component, the background color is
* inherited from the Component. Setting the background color
* in the Graphics2D context only affects the subsequent
* clearRect calls and not the background color of the
* Component. To change the background
* of the Component, use appropriate methods of
* the Component.
* @param color the background color that isused in
* subsequent calls to clearRect
* @see #getBackground
* @see java.awt.Graphics#clearRect
*/
public void setBackground(Color color) {
gc.setBackground(color);
}
/**
* Returns the background color used for clearing a region.
* @return the current Graphics2D Color,
* which defines the background color.
* @see #setBackground
*/
public Color getBackground() {
return gc.getBackground();
}
/**
* Returns the current Stroke in the
* Graphics2D context.
* @return the current Graphics2D Stroke,
* which defines the line style.
* @see #setStroke
*/
public Stroke getStroke() {
return gc.getStroke();
}
/**
* Intersects the current Clip with the interior of the
* specified Shape and sets the Clip to the
* resulting intersection. The specified Shape is
* transformed with the current Graphics2D
* Transform before being intersected with the current
* Clip. This method is used to make the current
* Clip smaller.
* To make the Clip larger, use setClip.
* The user clip modified by this method is independent of the
* clipping associated with device bounds and visibility. If no clip has
* previously been set, or if the clip has been cleared using
* {@link java.awt.Graphics#setClip(Shape) setClip} with a
* null argument, the specified Shape becomes
* the new user clip.
* @param s the Shape to be intersected with the current
* Clip. If s is null,
* this method clears the current Clip.
*/
public void clip(Shape s) {
gc.clip(s);
}
/**
* Get the rendering context of the Font within this
* Graphics2D context.
* The {@link FontRenderContext}
* encapsulates application hints such as anti-aliasing and
* fractional metrics, as well as target device specific information
* such as dots-per-inch. This information should be provided by the
* application when using objects that perform typographical
* formatting, such as Font and
* TextLayout. This information should also be provided
* by applications that perform their own layout and need accurate
* measurements of various characteristics of glyphs such as advance
* and line height when various rendering hints have been applied to
* the text rendering.
*
* @return a reference to an instance of FontRenderContext.
* @see java.awt.font.FontRenderContext
* @see java.awt.Font#createGlyphVector(FontRenderContext,char[])
* @see java.awt.font.TextLayout
* @since JDK1.2
*/
public FontRenderContext getFontRenderContext() {
return gc.getFontRenderContext();
}
/**
* @return the {@link GraphicContext} of this Graphics2D.
*/
public GraphicContext getGraphicContext() {
return gc;
}
}