画布图形实例

package swt_jface.demo10; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.CLabel; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class GCCreation Display display = new Display(); Shell shell = new Shell(display); public GCCreation() Image image = new Image(display, C:/icons/eclipse.gif); Image image2 = new Image(display, image.getImageData(); GC gc = new GC(image2); gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE); gc.drawOval(10, 10, 90, 40); gc.dispose(); CLabel label = new CLabel(shell, SWT.NULL); label.setImage(image); label.setBounds(10, 10, 130, 130); CLabel label2 = new CLabel(shell, SWT.NULL); label2.setImage(image2); label2.setBounds(150, 10, 130, 130); shell.pack(); shell.open(); while (!shell.isDisposed() if (!display.readAndDispatch() display.sleep(); display.dispose(); public static void main(String args) new GCCreation(); package swt_jface.demo10;import org.eclipse.swt.SWT;import org.eclipse.swt.custom.CLabel;import org.eclipse.swt.graphics.GC;import org.eclipse.swt.graphics.Image;import org.eclipse.swt.widgets.Display;import org.eclipse.swt.widgets.Shell;public class GCCreation Display display = new Display();Shell shell = new Shell(display);public GCCreation() Image image = new Image(display, C:/icons/eclipse.gif);Image image2 = new Image(display, image.getImageData();GC gc = new GC(image2);gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE);gc.drawOval(10, 10, 90, 40);gc.dispose();CLabel label = new CLabel(shell, SWT.NULL);label.setImage(image);label.setBounds(10, 10, 130, 130);CLabel label2 = new CLabel(shell, SWT.NULL);label2.setImage(image2);label2.setBounds(150, 10, 130, 130);shell.pack();shell.open();while (!shell.isDisposed() if (!display.readAndDispatch() display.sleep();display.dispose();public static void main(String args) new GCCreation(); 接下来请参看以下示例：演示代码1：view plaincopy to clipboardprint?package swt_jface.demo10; import org.eclipse.swt.SWT; import org.eclipse.swt.events.PaintEvent; import org.eclipse.swt.events.PaintListener; import org.eclipse.swt.widgets.Canvas; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class CanvasExample Display display = new Display(); Shell shell = new Shell(display); public CanvasExample() Canvas canvas = new Canvas(shell, SWT.NULL); canvas.setBounds(10, 10, 200, 100); canvas.addPaintListener(new PaintListener() public void paintControl(PaintEvent e) e.gc.drawRoundRectangle(10, 10, 180, 80, 10, 10); ); shell.pack(); shell.open(); while (!shell.isDisposed() if (!display.readAndDispatch() display.sleep(); display.dispose(); public static void main(String args) new CanvasExample(); package swt_jface.demo10;import org.eclipse.swt.SWT;import org.eclipse.swt.events.PaintEvent;import org.eclipse.swt.events.PaintListener;import org.eclipse.swt.widgets.Canvas;import org.eclipse.swt.widgets.Display;import org.eclipse.swt.widgets.Shell;public class CanvasExample Display display = new Display();Shell shell = new Shell(display);public CanvasExample() Canvas canvas = new Canvas(shell, SWT.NULL);canvas.setBounds(10, 10, 200, 100);canvas.addPaintListener(new PaintListener() public void paintControl(PaintEvent e) e.gc.drawRoundRectangle(10, 10, 180, 80, 10, 10););shell.pack();shell.open();while (!shell.isDisposed() if (!display.readAndDispatch() display.sleep();display.dispose();public static void main(String args) new CanvasExample(); 演示代码2：(三角)view plaincopy to clipboardprint?package swt_jface.demo10; import org.eclipse.swt.SWT; import org.eclipse.swt.events.PaintEvent; import org.eclipse.swt.events.PaintListener; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Region; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Canvas; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class Clipping Display display = new Display(); Shell shell = new Shell(display); public Clipping() shell.setLayout(new FillLayout(); final Canvas canvas = new Canvas(shell, SWT.NULL); final Image image = new Image(display, C:/icons/eclipse.gif); canvas.addPaintListener(new PaintListener() public void paintControl(PaintEvent e) Region region = new Region(); region.add(new int60, 10, 10, 100, 110, 100); e.gc.setClipping(region); e.gc.drawImage(image, 0, 0); ); shell.setSize(200, 140); shell.open(); while (!shell.isDisposed() if (!display.readAndDispatch() display.sleep(); display.dispose(); public static void main(String args) new Clipping(); package swt_jface.demo10;import org.eclipse.swt.SWT;import org.eclipse.swt.events.PaintEvent;import org.eclipse.swt.events.PaintListener;import org.eclipse.swt.graphics.Image;import org.eclipse.swt.graphics.Region;import org.eclipse.swt.layout.FillLayout;import org.eclipse.swt.widgets.Canvas;import org.eclipse.swt.widgets.Display;import org.eclipse.swt.widgets.Shell;public class Clipping Display display = new Display();Shell shell = new Shell(display);public Clipping() shell.setLayout(new FillLayout();final Canvas canvas = new Canvas(shell, SWT.NULL);final Image image = new Image(display, C:/icons/eclipse.gif);canvas.addPaintListener(new PaintListener() public void paintControl(PaintEvent e) Region region = new Region();region.add(new int60, 10, 10, 100, 110, 100);e.gc.setClipping(region);e.gc.drawImage(image, 0, 0););shell.setSize(200, 140);shell.open();while (!shell.isDisposed() if (!display.readAndDispatch() display.sleep();display.dispose();public static void main(String args) new Clipping(); 演示代码3：（动态画布）view plaincopy to clipboardprint?package swt_jface.demo10; import org.eclipse.swt.SWT; import org.eclipse.swt.events.PaintEvent; import org.eclipse.swt.events.PaintListener; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Canvas; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class DoubleBuffer Display display = new Display(); Shell shell = new Shell(display); public DoubleBuffer() shell.setLayout(new FillLayout(); final Canvas canvas = new Canvas(shell, SWT.NULL); canvas.addPaintListener(new PaintListener() public void paintControl(PaintEvent e) Point size = canvas.getSize(); int x1 = (int) (Math.random() * size.x); int y1 = (int) (Math.random() * size.y); int x2 = Math.max(canvas.getBounds().width - x1 - 10, 50); int y2 = Math.max(canvas.getBounds().height - y1 - 10, 50); e.gc.drawRoundRectangle(x1, y1, x2, y2, 5, 5); display.timerExec(100, new Runnable() public void run() canvas.redraw(); ); ); final Canvas doubleBufferedCanvas = new Canvas(shell, SWT.NO_BACKGROUND); doubleBufferedCanvas.addPaintListener(new PaintListener() public void paintControl(PaintEvent e) Image image = (Image) doubleBufferedCanvas.getData(double-buffer-image); if (image = null | image.getBounds().width != doubleBufferedCanvas.getSize().x | image.getBounds().height != doubleBufferedCanvas.getSize().y) image = new Image( display, doubleBufferedCanvas.getSize().x, doubleBufferedCanvas.getSize().y); doubleBufferedCanvas.setData(double-buffer-image, image); GC imageGC = new GC(image); imageGC.setBackground(e.gc.getBackground(); imageGC.setForeground(e.gc.getForeground(); imageGC.setFont(e.gc.getFont(); Rectangle imageSize = image.getBounds(); imageGC.fillRectangle(0, 0, imageSize.width + 1, imageSize.height + 1); Point size = doubleBufferedCanvas.getSize(); int x1 = (int) (Math.random() * size.x); int y1 = (int) (Math.random() * size.y); int x2 = Math.max(doubleBufferedCanvas.getBounds().width - x1 - 10, 50); int y2 = Math.max(doubleBufferedCanvas.getBounds().height - y1 - 10, 50); imageGC.drawRoundRectangle(x1, y1, x2, y2, 5, 5); e.gc.drawImage(image, 0, 0); imageGC.dispose(); display.timerExec(100, new Runnable() public void run() doubleBufferedCanvas.redraw(); ); ); shell.setSize(300, 200); shell.open(); while (!shell.isDisposed() if (!display.readAndDispatch() display.sleep(); display.dispose(); public static void main(String args) new DoubleBuffer(); package swt_jface.demo10;import org.eclipse.swt.SWT;import org.eclipse.swt.events.PaintEvent;import org.eclipse.swt.events.PaintListener;import org.eclipse.swt.graphics.GC;import org.eclipse.swt.graphics.Image;import org.eclipse.swt.graphics.Point;import org.eclipse.swt.graphics.Rectangle;import org.eclipse.swt.layout.FillLayout;import org.eclipse.swt.widgets.Canvas;import org.eclipse.swt.widgets.Display;import org.eclipse.swt.widgets.Shell;public class DoubleBuffer Display display = new Display();Shell shell = new Shell(display);public DoubleBuffer() shell.setLayout(new FillLayout();final Canvas canvas = new Canvas(shell, SWT.NULL);canvas.addPaintListener(new PaintListener() public void paintControl(PaintEvent e) Point size = canvas.getSize();int x1 = (int) (Math.random() * size.x);int y1 = (int) (Math.random() * size.y);int x2 = Math.max(canvas.getBounds().width - x1 - 10, 50);int y2 = Math.max(canvas.getBounds().height - y1 - 10, 50);e.gc.drawRoundRectangle(x1, y1, x2, y2, 5, 5);display.timerExec(100, new Runnable() public void run() canvas.redraw();););final Canvas doubleBufferedCanvas = new Canvas(shell, SWT.NO_BACKGROUND);doubleBufferedCanvas.addPaintListener(new PaintListener() public void paintControl(PaintEvent e) Image image = (Image) doubleBufferedCanvas.getData(double-buffer-image);if (image = null| image.getBounds().width != doubleBufferedCanvas.getSize().x| image.getBounds().height != doubleBufferedCanvas.getSize().y) image =new Image(display,doubleBufferedCanvas.getSize().x,doubleBufferedCanvas.getSize().y);doubleBufferedCanvas.setData(double-buffer-image, image);GC imageGC = new GC(image);imageGC.setBackground(e.gc.getBackground();imageGC.setForeground(e.gc.getForeground();imageGC.setFont(e.gc.getFont();Rectangle imageSize = image.getBounds();imageGC.fillRectangle(0, 0, imageSize.width + 1, imageSize.height + 1);Point size = doubleBufferedCanvas.getSize();int x1 = (int) (Math.random() * size.x);int y1 = (int) (Math.random() * size.y);int x2 = Math.max(doubleBufferedCanvas.getBounds().width - x1 - 10, 50);int y2 = Math.max(doubleBufferedCanvas.getBounds().height - y1 - 10, 50);imageGC.drawRoundRectangle(x1, y1, x2, y2, 5, 5);e.gc.drawImage(image, 0, 0);imageGC.dispose();display.timerExec(100, new Runnable() public void run() doubleBufferedCanvas.redraw();););shell.setSize(300, 200);shell.open();while (!shell.isDisposed() if (!display.readAndDispatch() display.sleep();display.dispose();public static void main(String args) new DoubleBuffer(); 演示代码4：（图片）view plaincopy to clipboardprint?package swt_jface.demo10; import org.eclipse.swt.SWT; import org.eclipse.swt.events.PaintEvent; import org.eclipse.swt.events.PaintListener; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.ImageData; import org.eclipse.swt.graphics.ImageLoader; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Canvas; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class DrawImages Display display = new Display(); Shell shell = new Shell(display); public DrawImages() shell.setLayout(new FillLayout(); Canvas canvas = new Canvas(shell, SWT.NULL); final Image image = new Image(display, C:/icons/eclipse.gif); canvas.addPaintListener(new PaintListener() public void paintControl(PaintEvent e) e.gc.drawImage(image, 10, 10); e.gc.drawImage(image, 0, 0, 100, 100, 200, 10, 200, 50); ); shell.setSize(430, 200); shell.open(); captureControl(canvas, canvas.bmp); while (!shell.isDisposed() if (!display.readAndDispatch() display.sleep(); display.dispose(); public static void captureControl(Control control, String file) GC gc = new GC(control); Image image = new Image(control.getDisplay(), control.getSize().x, control.getSize().y); gc.copyArea(image, 0, 0); ImageLoader loader = new ImageLoader(); loader.data = new ImageData image.getImageData() ; loader.save(file, SWT.IMAGE_BMP); gc.dispose(); public static void main(String args) new DrawImages(); package swt_jface.demo10;import org.eclipse.swt.SWT;import org.eclipse.swt.events.PaintEvent;import org.eclipse.swt.events.PaintListener;import org.eclipse.swt.graphics.GC;import org.eclipse.swt.graphics.Image;import org.eclipse.swt.graphics.ImageData;import org.eclipse.swt.graphics.ImageLoader;import org.eclipse.swt.layout.FillLayout;import org.eclipse.swt.widgets.Canvas;import org.eclipse.swt.widgets.Control;import org.eclipse.swt.widgets.Display;import org.eclipse.swt.widgets.Shell;public class DrawImages Display display = new Display();Shell shell = new Shell(display);public DrawImages() shell.setLayout(new FillLayout();Canvas canvas = new Canvas(shell, SWT.NULL);final Image image = new Image(display, C:/icons/eclipse.gif);canvas.addPaintListener(new PaintListener() public void paintControl(PaintEvent e) e.gc.drawImage(image, 10, 10);e.gc.drawImage(image, 0, 0, 100, 100, 200, 10, 200, 50););shell.setSize(430, 200);shell.open();captureControl(canvas, canvas.bmp);while (!shell.isDisposed() if (!display.readAndDispatch() display.sleep();display.dispose();public static void captureControl(Control control, String file) GC gc = new GC(control);Image image = new Image(control.getDisplay(), control.getSize().x, control