Draw Graphics2D stuff on a swt composite
/*
* JFreeChart : a free chart library for the Java(tm) platform
*
*
* (C) Copyright 2000-2009, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library 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 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------------
* SWTGraphics2D.java
* ------------------
* (C) Copyright 2006-2008, by Henry Proudhon and Contributors.
*
* Original Author: Henry Proudhon (henry.proudhon AT ensmp.fr);
* Contributor(s): Cedric Chabanois (cchabanois AT no-log.org);
* David Gilbert (for Object Refinery Limited);
* Ronnie Duan (see bug report 2583891);
*
* Changes
* -------
* 14-Jun-2006 : New class (HP);
* 29-Jan-2007 : Fixed the fillRect method (HP);
* 31-Jan-2007 : Moved the dummy JPanel to SWTUtils.java,
* implemented the drawLine method (HP);
* 07-Apr-2007 : Dispose some of the swt ressources,
* thanks to silent for pointing this out (HP);
* 23-May-2007 : Removed resource leaks by adding a resource pool (CC);
* 15-Jun-2007 : Fixed compile error for JDK 1.4 (DG);
* 22-Oct-2007 : Implemented clipping (HP);
* 22-Oct-2007 : Implemented some AlphaComposite support (HP);
* 23-Oct-2007 : Added mechanism for storing RenderingHints (which are
* still ignored at this point) (DG);
* 23-Oct-2007 : Implemented drawPolygon(), drawPolyline(), drawOval(),
* fillOval(), drawArc() and fillArc() (DG);
* 27-Nov-2007 : Implemented a couple of drawImage() methods (DG);
* 18-Nov-2008 : Check for GradientPaint in setPaint() method (DG);
* 27-Feb-2009 : Implemented fillPolygon() - see bug 2583891 (DG);
*
*/
import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.Image;
import java.awt.Paint;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.RenderingHints.Key;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;
import java.awt.geom.AffineTransform;
import java.awt.geom.PathIterator;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import java.awt.image.ImageObserver;
import java.awt.image.RenderedImage;
import java.awt.image.renderable.RenderableImage;
import java.text.AttributedCharacterIterator;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.Path;
import org.eclipse.swt.graphics.Resource;
import org.eclipse.swt.graphics.Transform;
/**
* This is a class utility to draw Graphics2D stuff on a swt composite.
* It is presently developed to use JFreeChart with the Standard
* Widget Toolkit but may be of a wider use later.
*/
public class SWTGraphics2D extends Graphics2D {
/** The swt graphic composite */
private GC gc;
/**
* The rendering hints. For now, these are not used, but at least the
* basic mechanism is present.
*/
private RenderingHints hints;
/** A reference to the compositing rule to apply. This is necessary
* due to the poor compositing interface of the SWT toolkit. */
private java.awt.Composite composite;
/** A HashMap to store the Swt color resources. */
private Map colorsPool = new HashMap();
/** A HashMap to store the Swt font resources. */
private Map fontsPool = new HashMap();
/** A HashMap to store the Swt transform resources. */
private Map transformsPool = new HashMap();
/** A List to store the Swt resources. */
private List resourcePool = new ArrayList();
/**
* Creates a new instance.
*
* @param gc the graphics context.
*/
public SWTGraphics2D(GC gc) {
super();
this.gc = gc;
this.hints = new RenderingHints(null);
this.composite = AlphaComposite.getInstance(AlphaComposite.SRC, 1.0f);
}
/**
* Not implemented yet - see {@link Graphics#create()}.
*
* @return <code>null</code>.
*/
public Graphics create() {
// TODO Auto-generated method stub
return null;
}
/**
* Not implemented yet - see {@link Graphics2D#getDeviceConfiguration()}.
*
* @return <code>null</code>.
*/
public GraphicsConfiguration getDeviceConfiguration() {
// TODO Auto-generated method stub
return null;
}
/**
* Returns the current value for the specified hint key, or
* <code>null</code> if no value is set.
*
* @param hintKey the hint key (<code>null</code> permitted).
*
* @return The hint value, or <code>null</code>.
*
* @see #setRenderingHint(RenderingHints.Key, Object)
*/
public Object getRenderingHint(Key hintKey) {
return this.hints.get(hintKey);
}
/**
* Sets the value for a rendering hint. For now, this graphics context
* ignores all hints.
*
* @param hintKey the key (<code>null</code> not permitted).
* @param hintValue the value (must be compatible with the specified key).
*
* @throws IllegalArgumentException if <code>hintValue</code> is not
* compatible with the <code>hintKey</code>.
*
* @see #getRenderingHint(RenderingHints.Key)
*/
public void setRenderingHint(Key hintKey, Object hintValue) {
this.hints.put(hintKey, hintValue);
}
/**
* Returns a copy of the hints collection for this graphics context.
*
* @return A copy of the hints collection.
*/
public RenderingHints getRenderingHints() {
return (RenderingHints) this.hints.clone();
}
/**
* Adds the hints in the specified map to the graphics context, replacing
* any existing hints. For now, this graphics context ignores all hints.
*
* @param hints the hints (<code>null</code> not permitted).
*
* @see #setRenderingHints(Map)
*/
public void addRenderingHints(Map hints) {
this.hints.putAll(hints);
}
/**
* Replaces the existing hints with those contained in the specified
* map. Note that, for now, this graphics context ignores all hints.
*
* @param hints the hints (<code>null</code> not permitted).
*
* @see #addRenderingHints(Map)
*/
public void setRenderingHints(Map hints) {
if (hints == null) {
throw new NullPointerException("Null 'hints' argument.");
}
this.hints = new RenderingHints(hints);
}
/**
* Returns the current paint for this graphics context.
*
* @return The current paint.
*
* @see #setPaint(Paint)
*/
public Paint getPaint() {
// TODO: it might be a good idea to keep a reference to the color
// specified in setPaint() or setColor(), rather than creating a
// new object every time getPaint() is called.
return SWTUtils.toAwtColor(this.gc.getForeground());
}
/**
* Sets the paint for this graphics context. For now, this graphics
* context only supports instances of {@link Color} or
* {@link GradientPaint} (in the latter case there is no real gradient
* support, the paint used is the <code>Color</code> returned by
* <code>getColor1()</code>).
*
* @param paint the paint (<code>null</code> not permitted).
*
* @see #getPaint()
* @see #setColor(Color)
*/
public void setPaint(Paint paint) {
if (paint instanceof Color) {
setColor((Color) paint);
}
else if (paint instanceof GradientPaint) {
GradientPaint gp = (GradientPaint) paint;
setColor(gp.getColor1());
}
else {
throw new RuntimeException("Can only handle 'Color' at present.");
}
}
/**
* Returns the current color for this graphics context.
*
* @return The current color.
*
* @see #setColor(Color)
*/
public Color getColor() {
// TODO: it might be a good idea to keep a reference to the color
// specified in setPaint() or setColor(), rather than creating a
// new object every time getPaint() is called.
return SWTUtils.toAwtColor(this.gc.getForeground());
}
/**
* Sets the current color for this graphics context.
*
* @param color the color.
*
* @see #getColor()
*/
public void setColor(Color color) {
org.eclipse.swt.graphics.Color swtColor = getSwtColorFromPool(color);
this.gc.setForeground(swtColor);
// handle transparency and compositing.
if (this.composite instanceof AlphaComposite) {
AlphaComposite acomp = (AlphaComposite) this.composite;
switch (acomp.getRule()) {
case AlphaComposite.SRC_OVER:
this.gc.setAlpha((int) (color.getAlpha() * acomp.getAlpha()));
break;
default:
this.gc.setAlpha(color.getAlpha());
break;
}
}
}
/**
* Sets the background colour.
*
* @param color the colour.
*/
public void setBackground(Color color) {
org.eclipse.swt.graphics.Color swtColor = getSwtColorFromPool(color);
this.gc.setBackground(swtColor);
}
/**
* Returns the background colour.
*
* @return The background colour.
*/
public Color getBackground() {
return SWTUtils.toAwtColor(this.gc.getBackground());
}
/**
* Not implemented - see {@link Graphics#setPaintMode()}.
*/
public void setPaintMode() {
// TODO Auto-generated method stub
}
/**
* Not implemented - see {@link Graphics#setXORMode(Color)}.
*
* @param color the colour.
*/
public void setXORMode(Color color) {
// TODO Auto-generated method stub
}
/**
* Returns the current composite.
*
* @return The current composite.
*
* @see #setComposite(Composite)
*/
public Composite getComposite() {
return this.composite;
}
/**
* Sets the current composite. This implementation currently supports
* only the {@link AlphaComposite} class.
*
* @param comp the composite.
*/
public void setComposite(Composite comp) {
this.composite = comp;
if (comp instanceof AlphaComposite) {
AlphaComposite acomp = (AlphaComposite) comp;
int alpha = (int) (acomp.getAlpha() * 0xFF);
this.gc.setAlpha(alpha);
}
else {
System.out.println("warning, can only handle alpha composite at the moment.");
}
}
/**
* Returns the current stroke for this graphics context.
*
* @return The current stroke.
*
* @see #setStroke(Stroke)
*/
public Stroke getStroke() {
return new BasicStroke(this.gc.getLineWidth(), this.gc.getLineCap(),
this.gc.getLineJoin());
}
/**
* Sets the stroke for this graphics context. For now, this implementation
* only recognises the {@link BasicStroke} class.
*
* @param stroke the stroke (<code>null</code> not permitted).
*
* @see #getStroke()
*/
public void setStroke(Stroke stroke) {
if (stroke instanceof BasicStroke) {
BasicStroke bs = (BasicStroke) stroke;
// linewidth
this.gc.setLineWidth((int) bs.getLineWidth());
// line join
switch (bs.getLineJoin()) {
case BasicStroke.JOIN_BEVEL :
this.gc.setLineJoin(SWT.JOIN_BEVEL);
break;
case BasicStroke.JOIN_MITER :
this.gc.setLineJoin(SWT.JOIN_MITER);
break;
case BasicStroke.JOIN_ROUND :
this.gc.setLineJoin(SWT.JOIN_ROUND);
break;
}
// line cap
switch (bs.getEndCap()) {
case BasicStroke.CAP_BUTT :
this.gc.setLineCap(SWT.CAP_FLAT);
break;
case BasicStroke.CAP_ROUND :
this.gc.setLineCap(SWT.CAP_ROUND);
break;
case BasicStroke.CAP_SQUARE :
this.gc.setLineCap(SWT.CAP_SQUARE);
break;
}
// set the line style to solid by default
this.gc.setLineStyle(SWT.LINE_SOLID);
// apply dash style if any
float[] dashes = bs.getDashArray();
if (dashes != null) {
int[] swtDashes = new int[dashes.length];
for (int i = 0; i < swtDashes.length; i++) {
swtDashes[i] = (int) dashes[i];
}
this.gc.setLineDash(swtDashes);
}
}
else {
throw new RuntimeException(
"Can only handle 'Basic Stroke' at present.");
}
}
/**
* Applies the specified clip.
*
* @param s the shape for the clip.
*/
public void clip(Shape s) {
Path path = toSwtPath(s);
this.gc.setClipping(path);
path.dispose();
}
/**
* Returns the clip bounds.
*
* @return The clip bounds.
*/
public Rectangle getClipBounds() {
org.eclipse.swt.graphics.Rectangle clip = this.gc.getClipping();
return new Rectangle(clip.x, clip.y, clip.width, clip.height);
}
/**
* Sets the clipping to the intersection of the current clip region and
* the specified rectangle.
*
* @param x the x-coordinate.
* @param y the y-coordinate.
* @param width the width.
* @param height the height.
*/
public void clipRect(int x, int y, int width, int height) {
org.eclipse.swt.graphics.Rectangle clip = this.gc.getClipping();
clip.intersects(x, y, width, height);
this.gc.setClipping(clip);
}
/**
* Returns the current clip.
*
* @return The current clip.
*/
public Shape getClip() {
return SWTUtils.toAwtRectangle(this.gc.getClipping());
}
/**
* Sets the clip region.
*
* @param clip the clip.
*/
public void setClip(Shape clip) {
if (clip == null) {
return;
}
Path clipPath = toSwtPath(clip);
this.gc.setClipping(clipPath);
clipPath.dispose();
}
/**
* Sets the clip region to the specified rectangle.
*
* @param x the x-coordinate.
* @param y the y-coordinate.
* @param width the width.
* @param height the height.
*/
public void setClip(int x, int y, int width, int height) {
this.gc.setClipping(x, y, width, height);
}
/**
* Returns the current transform.
*
* @return The current transform.
*/
public AffineTransform getTransform() {
Transform swtTransform = new Transform(this.gc.getDevice());
this.gc.getTransform(swtTransform);
AffineTransform awtTransform = toAwtTransform(swtTransform);
swtTransform.dispose();
return awtTransform;
}
/**
* Sets the current transform.
*
* @param t the transform.
*/
public void setTransform(AffineTransform t) {
Transform transform = getSwtTransformFromPool(t);
this.gc.setTransform(transform);
}
/**
* Concatenates the specified transform to the existing transform.
*
* @param t the transform.
*/
public void transform(AffineTransform t) {
Transform swtTransform = new Transform(this.gc.getDevice());
this.gc.getTransform(swtTransform);
swtTransform.multiply(getSwtTransformFromPool(t));
this.gc.setTransform(swtTransform);
swtTransform.dispose();
}
/**
* Applies a translation.
*
* @param x the translation along the x-axis.
* @param y the translation along the y-axis.
*/
public void translate(int x, int y) {
Transform swtTransform = new Transform(this.gc.getDevice());
this.gc.getTransform(swtTransform);
swtTransform.translate(x, y);
this.gc.setTransform(swtTransform);
swtTransform.dispose();
}
/**
* Applies a translation.
*
* @param tx the translation along the x-axis.
* @param ty the translation along the y-axis.
*/
public void translate(double tx, double ty) {
translate((int) tx, (int) ty);
}
/**
* Applies a rotation transform.
*
* @param theta the angle of rotation.
*/
public void rotate(double theta) {
Transform swtTransform = new Transform(this.gc.getDevice());
this.gc.getTransform(swtTransform);
swtTransform.rotate((float) (theta * 180 / Math.PI));
this.gc.setTransform(swtTransform);
swtTransform.dispose();
}
/**
* Not implemented - see {@link Graphics2D#rotate(double, double, double)}.
*
* @see java.awt.Graphics2D#rotate(double, double, double)
*/
public void rotate(double theta, double x, double y) {
// TODO Auto-generated method stub
}
/**
* Applies a scale transform.
*
* @param scaleX the scale factor along the x-axis.
* @param scaleY the scale factor along the y-axis.
*/
public void scale(double scaleX, double scaleY) {
Transform swtTransform = new Transform(this.gc.getDevice());
this.gc.getTransform(swtTransform);
swtTransform.scale((float) scaleX, (float) scaleY);
this.gc.setTransform(swtTransform);
swtTransform.dispose();
}
/**
* Applies a shear transform.
*
* @param shearX the x-factor.
* @param shearY the y-factor.
*/
public void shear(double shearX, double shearY) {
Transform swtTransform = new Transform(this.gc.getDevice());
this.gc.getTransform(swtTransform);
Transform shear = new Transform(this.gc.getDevice(), 1f, (float) shearX,
(float) shearY, 1f, 0, 0);
swtTransform.multiply(shear);
this.gc.setTransform(swtTransform);
swtTransform.dispose();
}
/**
* Draws the outline of the specified shape using the current stroke and
* paint settings.
*
* @param shape the shape (<code>null</code> not permitted).
*
* @see #getPaint()
* @see #getStroke()
* @see #fill(Shape)
*/
public void draw(Shape shape) {
Path path = toSwtPath(shape);
this.gc.drawPath(path);
path.dispose();
}
/**
* Draws a line from (x1, y1) to (x2, y2) using the current stroke
* and paint settings.
*
* @param x1 the x-coordinate for the starting point.
* @param y1 the y-coordinate for the starting point.
* @param x2 the x-coordinate for the ending point.
* @param y2 the y-coordinate for the ending point.
*
* @see #draw(Shape)
*/
public void drawLine(int x1, int y1, int x2, int y2) {
this.gc.drawLine(x1, y1, x2, y2);
}
/**
* Draws the outline of the polygon specified by the given points, using
* the current paint and stroke settings.
*
* @param xPoints the x-coordinates.
* @param yPoints the y-coordinates.
* @param npoints the number of points in the polygon.
*
* @see #draw(Shape)
*/
public void drawPolygon(int [] xPoints, int [] yPoints, int npoints) {
drawPolyline(xPoints, yPoints, npoints);
if (npoints > 1) {
this.gc.drawLine(xPoints[npoints - 1], yPoints[npoints - 1],
xPoints[0], yPoints[0]);
}
}
/**
* Draws a sequence of connected lines specified by the given points, using
* the current paint and stroke settings.
*
* @param xPoints the x-coordinates.
* @param yPoints the y-coordinates.
* @param npoints the number of points in the polygon.
*
* @see #draw(Shape)
*/
public void drawPolyline(int [] xPoints, int [] yPoints, int npoints) {
if (npoints > 1) {
int x0 = xPoints[0];
int y0 = yPoints[0];
int x1 = 0, y1 = 0;
for (int i = 1; i < npoints; i++) {
x1 = xPoints[i];
y1 = yPoints[i];
this.gc.drawLine(x0, y0, x1, y1);
x0 = x1;
y0 = y1;
}
}
}
/**
* Draws an oval that fits within the specified rectangular region.
*
* @param x the x-coordinate.
* @param y the y-coordinate.
* @param width the frame width.
* @param height the frame height.
*
* @see #fillOval(int, int, int, int)
* @see #draw(Shape)
*/
public void drawOval(int x, int y, int width, int height) {
this.gc.drawOval(x, y, width - 1, height - 1);
}
/**
* Draws an arc that is part of an ellipse that fits within the specified
* framing rectangle.
*
* @param x the x-coordinate.
* @param y the y-coordinate.
* @param width the frame width.
* @param height the frame height.
* @param arcStart the arc starting point, in degrees.
* @param arcAngle the extent of the arc.
*
* @see #fillArc(int, int, int, int, int, int)
*/
public void drawArc(int x, int y, int width, int height, int arcStart,
int arcAngle) {
this.gc.drawArc(x, y, width - 1, height - 1, arcStart, arcAngle);
}
/**
* Draws a rectangle with rounded corners that fits within the specified
* framing rectangle.
*
* @param x the x-coordinate.
* @param y the y-coordinate.
* @param width the frame width.
* @param height the frame height.
* @param arcWidth the width of the arc defining the roundedness of the
* rectangle's corners.
* @param arcHeight the height of the arc defining the roundedness of the
* rectangle's corners.
*
* @see #fillRoundRect(int, int, int, int, int, int)
*/
public void drawRoundRect(int x, int y, int width, int height,
int arcWidth, int arcHeight) {
this.gc.drawRoundRectangle(x, y, width - 1, height - 1, arcWidth,
arcHeight);
}
/**
* Fills the specified shape using the current paint.
*
* @param shape the shape (<code>null</code> not permitted).
*
* @see #getPaint()
* @see #draw(Shape)
*/
public void fill(Shape shape) {
Path path = toSwtPath(shape);
// Note that for consistency with the AWT implementation, it is
// necessary to switch temporarily the foreground and background
// colours
switchColors();
this.gc.fillPath(path);
switchColors();
path.dispose();
}
/**
* Fill a rectangle area on the swt graphic composite.
* The <code>fillRectangle</code> method of the <code>GC</code>
* class uses the background color so we must switch colors.
* @see java.awt.Graphics#fillRect(int, int, int, int)
*/
public void fillRect(int x, int y, int width, int height) {
this.switchColors();
this.gc.fillRectangle(x, y, width, height);
this.switchColors();
}
/**
* Fills the specified rectangle with the current background colour.
*
* @param x the x-coordinate for the rectangle.
* @param y the y-coordinate for the rectangle.
* @param width the width.
* @param height the height.
*
* @see #fillRect(int, int, int, int)
*/
public void clearRect(int x, int y, int width, int height) {
Paint saved = getPaint();
setPaint(getBackground());
fillRect(x, y, width, height);
setPaint(saved);
}
/**
* Fills the specified polygon.
*
* @param xPoints the x-coordinates.
* @param yPoints the y-coordinates.
* @param npoints the number of points.
*/
public void fillPolygon(int[] xPoints, int[] yPoints, int npoints) {
int[] pointArray = new int[npoints * 2];
for (int i = 0; i < npoints; i++) {
pointArray[2 * i] = xPoints[i];
pointArray[2 * i + 1] = yPoints[i];
}
switchColors();
this.gc.fillPolygon(pointArray);
switchColors();
}
/**
* Draws a rectangle with rounded corners that fits within the specified
* framing rectangle.
*
* @param x the x-coordinate.
* @param y the y-coordinate.
* @param width the frame width.
* @param height the frame height.
* @param arcWidth the width of the arc defining the roundedness of the
* rectangle's corners.
* @param arcHeight the height of the arc defining the roundedness of the
* rectangle's corners.
*
* @see #drawRoundRect(int, int, int, int, int, int)
*/
public void fillRoundRect(int x, int y, int width, int height,
int arcWidth, int arcHeight) {
switchColors();
this.gc.fillRoundRectangle(x, y, width - 1, height - 1, arcWidth,
arcHeight);
switchColors();
}
/**
* Fills an oval that fits within the specified rectangular region.
*
* @param x the x-coordinate.
* @param y the y-coordinate.
* @param width the frame width.
* @param height the frame height.
*
* @see #drawOval(int, int, int, int)
* @see #fill(Shape)
*/
public void fillOval(int x, int y, int width, int height) {
switchColors();
this.gc.fillOval(x, y, width - 1, height - 1);
switchColors();
}
/**
* Fills an arc that is part of an ellipse that fits within the specified
* framing rectangle.
*
* @param x the x-coordinate.
* @param y the y-coordinate.
* @param width the frame width.
* @param height the frame height.
* @param arcStart the arc starting point, in degrees.
* @param arcAngle the extent of the arc.
*
* @see #drawArc(int, int, int, int, int, int)
*/
public void fillArc(int x, int y, int width, int height, int arcStart,
int arcAngle) {
switchColors();
this.gc.fillArc(x, y, width - 1, height - 1, arcStart, arcAngle);
switchColors();
}
/**
* Returns the font in form of an awt font created
* with the parameters of the font of the swt graphic
* composite.
* @see java.awt.Graphics#getFont()
*/
public Font getFont() {
// retrieve the swt font description in an os indept way
FontData[] fontData = this.gc.getFont().getFontData();
// create a new awt font with the appropiate data
return SWTUtils.toAwtFont(this.gc.getDevice(), fontData[0], true);
}
/**
* Set the font swt graphic composite from the specified
* awt font. Be careful that the newly created swt font
* must be disposed separately.
* @see java.awt.Graphics#setFont(java.awt.Font)
*/
public void setFont(Font font) {
org.eclipse.swt.graphics.Font swtFont = getSwtFontFromPool(font);
this.gc.setFont(swtFont);
}
/**
* Returns the font metrics.
*
* @param font the font.
*
* @return The font metrics.
*/
public FontMetrics getFontMetrics(Font font) {
return SWTUtils.DUMMY_PANEL.getFontMetrics(font);
}
/**
* Returns the font render context.
*
* @return The font render context.
*/
public FontRenderContext getFontRenderContext() {
FontRenderContext fontRenderContext = new FontRenderContext(
new AffineTransform(), true, true);
return fontRenderContext;
}
/**
* Not implemented - see {@link Graphics2D#drawGlyphVector(GlyphVector,
* float, float)}.
*/
public void drawGlyphVector(GlyphVector g, float x, float y) {
// TODO Auto-generated method stub
}
/**
* Draws a string on the receiver. note that
* to be consistent with the awt method,
* the y has to be modified with the ascent of the font.
*
* @see java.awt.Graphics#drawString(java.lang.String, int, int)
*/
public void drawString(String text, int x, int y) {
float fm = this.gc.getFontMetrics().getAscent();
this.gc.drawString(text, x, (int) (y - fm), true);
}
/**
* Draws a string at the specified position.
*
* @param text the string.
* @param x the x-coordinate.
* @param y the y-coordinate.
*/
public void drawString(String text, float x, float y) {
float fm = this.gc.getFontMetrics().getAscent();
this.gc.drawString(text, (int) x, (int) (y - fm), true);
}
/**
* Draws a string at the specified position.
*
* @param iterator the string.
* @param x the x-coordinate.
* @param y the y-coordinate.
*/
public void drawString(AttributedCharacterIterator iterator, int x, int y) {
// TODO Auto-generated method stub
}
/**
* Draws a string at the specified position.
*
* @param iterator the string.
* @param x the x-coordinate.
* @param y the y-coordinate.
*/
public void drawString(AttributedCharacterIterator iterator, float x,
float y) {
// TODO Auto-generated method stub
}
/**
* Not implemented - see {@link Graphics2D#hit(Rectangle, Shape, boolean)}.
*
* @return <code>false</code>.
*/
public boolean hit(Rectangle rect, Shape text, boolean onStroke) {
// TODO Auto-generated method stub
return false;
}
/**
* Not implemented - see {@link Graphics#copyArea(int, int, int, int, int,
* int)}.
*/
public void copyArea(int x, int y, int width, int height, int dx, int dy) {
// TODO Auto-generated method stub
}
/**
* Not implemented - see {@link Graphics2D#drawImage(Image,
* AffineTransform, ImageObserver)}.
*
* @param image the image.
* @param xform the transform.
* @param obs an image observer.
*
* @return A boolean.
*/
public boolean drawImage(Image image, AffineTransform xform,
ImageObserver obs) {
// TODO Auto-generated method stub
return false;
}
/**
* Draws an image.
*
* @param image the image.
* @param op the image operation.
* @param x the x-coordinate.
* @param y the y-coordinate.
*/
public void drawImage(BufferedImage image, BufferedImageOp op, int x,
int y) {
org.eclipse.swt.graphics.Image im = new org.eclipse.swt.graphics.Image(
this.gc.getDevice(), SWTUtils.convertToSWT(image));
this.gc.drawImage(im, x, y);
im.dispose();
}
/**
* Draws an SWT image with the top left corner of the image aligned to the
* point (x, y).
*
* @param image the image.
* @param x the x-coordinate.
* @param y the y-coordinate.
*/
public void drawImage(org.eclipse.swt.graphics.Image image, int x, int y) {
this.gc.drawImage(image, x, y);
}
/**
* Not implemented - see {@link Graphics2D#drawRenderedImage(RenderedImage,
* AffineTransform)}.
*
* @param image the image.
* @param xform the transform.
*/
public void drawRenderedImage(RenderedImage image, AffineTransform xform) {
// TODO Auto-generated method stub
}
/**
* Not implemented - see {@link Graphics2D#drawRenderableImage(
* RenderableImage, AffineTransform)}.
*
* @param image the image.
* @param xform the transform.
*/
public void drawRenderableImage(RenderableImage image,
AffineTransform xform) {
// TODO Auto-generated method stub
}
/**
* Draws an image with the top left corner aligned to the point (x, y).
*
* @param image the image.
* @param x the x-coordinate.
* @param y the y-coordinate.
* @param observer ignored here.
*
* @return <code>true</code> if the image has been drawn.
*/
public boolean drawImage(Image image, int x, int y,
ImageObserver observer) {
ImageData data = SWTUtils.convertAWTImageToSWT(image);
if (data == null) {
return false;
}
org.eclipse.swt.graphics.Image im = new org.eclipse.swt.graphics.Image(
this.gc.getDevice(), data);
this.gc.drawImage(im, x, y);
im.dispose();
return true;
}
/**
* Draws an image with the top left corner aligned to the point (x, y),
* and scaled to the specified width and height.
*
* @param image the image.
* @param x the x-coordinate.
* @param y the y-coordinate.
* @param width the width for the rendered image.
* @param height the height for the rendered image.
* @param observer ignored here.
*
* @return <code>true</code> if the image has been drawn.
*/
public boolean drawImage(Image image, int x, int y, int width, int height,
ImageObserver observer) {
ImageData data = SWTUtils.convertAWTImageToSWT(image);
if (data == null) {
return false;
}
org.eclipse.swt.graphics.Image im = new org.eclipse.swt.graphics.Image(
this.gc.getDevice(), data);
org.eclipse.swt.graphics.Rectangle bounds = im.getBounds();
this.gc.drawImage(im, 0, 0, bounds.width, bounds.height, x, y, width,
height);
im.dispose();
return true;
}
/**
* Draws an image.
*
* @param image (<code>null</code> not permitted).
* @param x the x-coordinate.
* @param y the y-coordinate.
* @param bgcolor the background color.
* @param observer an image observer.
*
* @return A boolean.
*/
public boolean drawImage(Image image, int x, int y, Color bgcolor,
ImageObserver observer) {
if (image == null) {
throw new IllegalArgumentException("Null 'image' argument.");
}
int w = image.getWidth(null);
int h = image.getHeight(null);
if (w == -1 || h == -1) {
return false;
}
Paint savedPaint = getPaint();
fill(new Rectangle2D.Double(x, y, w, h));
setPaint(savedPaint);
return drawImage(image, x, y, observer);
}
/**
* Draws an image.
*
* @param image the image (<code>null</code> not permitted).
* @param x the x-coordinate.
* @param y the y-coordinate.
* @param width the width.
* @param height the height.
* @param bgcolor the background colour.
* @param observer an image observer.
*
* @return A boolean.
*/
public boolean drawImage(Image image, int x, int y, int width, int height,
Color bgcolor, ImageObserver observer) {
if (image == null) {
throw new IllegalArgumentException("Null 'image' argument.");
}
int w = image.getWidth(null);
int h = image.getHeight(null);
if (w == -1 || h == -1) {
return false;
}
Paint savedPaint = getPaint();
fill(new Rectangle2D.Double(x, y, w, h));
setPaint(savedPaint);
return drawImage(image, x, y, width, height, observer);
}
/**
* Not implemented - see {@link Graphics#drawImage(Image, int, int, int,
* int, int, int, int, int, ImageObserver)}.
*
* @param image the image.
* @param dx1
* @param dy1
* @param dx2
* @param dy2
* @param sx1
* @param sy1
* @param sx2
* @param sy2
* @param observer
*/
public boolean drawImage(Image image, int dx1, int dy1, int dx2, int dy2,
int sx1, int sy1, int sx2, int sy2, ImageObserver observer) {
// TODO Auto-generated method stub
return false;
}
/**
* Not implemented - see {@link Graphics#drawImage(Image, int, int, int,
* int, int, int, int, int, Color, ImageObserver)}.
*
* @param image the image.
* @param dx1
* @param dy1
* @param dx2
* @param dy2
* @param sx1
* @param sy1
* @param sx2
* @param sy2
* @param bgcolor
* @param observer
*/
public boolean drawImage(Image image, int dx1, int dy1, int dx2, int dy2,
int sx1, int sy1, int sx2, int sy2, Color bgcolor,
ImageObserver observer) {
// TODO Auto-generated method stub
return false;
}
/**
* Releases resources held by this instance (but note that the caller
* must dispose of the 'GC' passed to the constructor).
*
* @see java.awt.Graphics#dispose()
*/
public void dispose() {
// we dispose resources we own but user must dispose gc
disposeResourcePool();
}
/**
* Add given swt resource to the resource pool. All resources added
* to the resource pool will be disposed when {@link #dispose()} is called.
*
* @param resource the resource to add to the pool.
* @return the swt <code>Resource</code> just added.
*/
private Resource addToResourcePool(Resource resource) {
this.resourcePool.add(resource);
return resource;
}
/**
* Dispose the resource pool.
*/
private void disposeResourcePool() {
for (Iterator it = this.resourcePool.iterator(); it.hasNext();) {
Resource resource = (Resource) it.next();
resource.dispose();
}
this.fontsPool.clear();
this.colorsPool.clear();
this.transformsPool.clear();
this.resourcePool.clear();
}
/**
* Internal method to convert a AWT font object into
* a SWT font resource. If a corresponding SWT font
* instance is already in the pool, it will be used
* instead of creating a new one. This is used in
* {@link #setFont()} for instance.
*
* @param font The AWT font to convert.
* @return The SWT font instance.
*/
private org.eclipse.swt.graphics.Font getSwtFontFromPool(Font font) {
org.eclipse.swt.graphics.Font swtFont = (org.eclipse.swt.graphics.Font)
this.fontsPool.get(font);
if (swtFont == null) {
swtFont = new org.eclipse.swt.graphics.Font(this.gc.getDevice(),
SWTUtils.toSwtFontData(this.gc.getDevice(), font, true));
addToResourcePool(swtFont);
this.fontsPool.put(font, swtFont);
}
return swtFont;
}
/**
* Internal method to convert a AWT color object into
* a SWT color resource. If a corresponding SWT color
* instance is already in the pool, it will be used
* instead of creating a new one. This is used in
* {@link #setColor()} for instance.
*
* @param awtColor The AWT color to convert.
* @return A SWT color instance.
*/
private org.eclipse.swt.graphics.Color getSwtColorFromPool(Color awtColor) {
org.eclipse.swt.graphics.Color swtColor =
(org.eclipse.swt.graphics.Color)
// we can't use the following valueOf() method, because it
// won't compile with JDK1.4
// this.colorsPool.get(Integer.valueOf(awtColor.getRGB()));
this.colorsPool.get(new Integer(awtColor.getRGB()));
if (swtColor == null) {
swtColor = SWTUtils.toSwtColor(this.gc.getDevice(), awtColor);
addToResourcePool(swtColor);
// see comment above
//this.colorsPool.put(Integer.valueOf(awtColor.getRGB()), swtColor);
this.colorsPool.put(new Integer(awtColor.getRGB()), swtColor);
}
return swtColor;
}
/**
* Internal method to convert a AWT transform object into
* a SWT transform resource. If a corresponding SWT transform
* instance is already in the pool, it will be used
* instead of creating a new one. This is used in
* {@link #setTransform()} for instance.
*
* @param awtTransform The AWT transform to convert.
* @return A SWT transform instance.
*/
private Transform getSwtTransformFromPool(AffineTransform awtTransform) {
Transform t = (Transform) this.transformsPool.get(awtTransform);
if (t == null) {
t = new Transform(this.gc.getDevice());
double[] matrix = new double[6];
awtTransform.getMatrix(matrix);
t.setElements((float) matrix[0], (float) matrix[1],
(float) matrix[2], (float) matrix[3],
(float) matrix[4], (float) matrix[5]);
addToResourcePool(t);
this.transformsPool.put(awtTransform, t);
}
return t;
}
/**
* Perform a switch between foreground and background
* color of gc. This is needed for consistency with
* the awt behaviour, and is required notably for the
* filling methods.
*/
private void switchColors() {
org.eclipse.swt.graphics.Color bg = this.gc.getBackground();
org.eclipse.swt.graphics.Color fg = this.gc.getForeground();
this.gc.setBackground(fg);
this.gc.setForeground(bg);
}
/**
* Converts an AWT <code>Shape</code> into a SWT <code>Path</code>.
*
* @param shape the shape (<code>null</code> not permitted).
*
* @return The path.
*/
private Path toSwtPath(Shape shape) {
int type;
float[] coords = new float[6];
Path path = new Path(this.gc.getDevice());
PathIterator pit = shape.getPathIterator(null);
while (!pit.isDone()) {
type = pit.currentSegment(coords);
switch (type) {
case (PathIterator.SEG_MOVETO):
path.moveTo(coords[0], coords[1]);
break;
case (PathIterator.SEG_LINETO):
path.lineTo(coords[0], coords[1]);
break;
case (PathIterator.SEG_QUADTO):
path.quadTo(coords[0], coords[1], coords[2], coords[3]);
break;
case (PathIterator.SEG_CUBICTO):
path.cubicTo(coords[0], coords[1], coords[2],
coords[3], coords[4], coords[5]);
break;
case (PathIterator.SEG_CLOSE):
path.close();
break;
default:
break;
}
pit.next();
}
return path;
}
/**
* Converts an SWT transform into the equivalent AWT transform.
*
* @param swtTransform the SWT transform.
*
* @return The AWT transform.
*/
private AffineTransform toAwtTransform(Transform swtTransform) {
float[] elements = new float[6];
swtTransform.getElements(elements);
AffineTransform awtTransform = new AffineTransform(elements);
return awtTransform;
}
}
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