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Java GUI (AWT,SWING,SWT,JFACE) Use of Java2D on SWT or Draw2D graphical context : 2D « SWT JFace Eclipse « Java
2015.07.28 21:39
Use of Java2D on SWT or Draw2D graphical context
Use of Java2D on SWT or Draw2D graphical context : 2D « SWT JFace Eclipse « Java
| /* * ----------------------------------------------------------------------------- * (c) Copyright IBM Corp. 2004 All rights reserved. * * The sample program(s) is/are owned by International Business Machines * Corporation or one of its subsidiaries ("IBM") and is/are copyrighted and * licensed, not sold. * * You may copy, modify, and distribute this/these sample program(s) in any form * without payment to IBM, for any purpose including developing, using, * marketing or distributing programs that include or are derivative works of * the sample program(s). * * The sample program(s) is/are provided to you on an "AS IS" basis, without * warranty of any kind. IBM HEREBY EXPRESSLY DISCLAIMS ALL WARRANTIES, EITHER * EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do * not allow for the exclusion or limitation of implied warranties, so the above * limitations or exclusions may not apply to you. IBM shall not be liable for * any damages you suffer as a result of using, modifying or distributing the * sample program(s) or its/their derivatives. * * Each copy of any portion of this/these sample program(s) or any derivative * work, must include the above copyright notice and disclaimer of warranty. * * ----------------------------------------------------------------------------- */ import java.awt.GradientPaint; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.image.BufferedImage; 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.PaletteData; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; 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 SWTTest { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setSize(350, 350); shell.setLayout(new GridLayout()); Canvas canvas = new Canvas(shell, SWT.NO_BACKGROUND); GridData data = new GridData(GridData.FILL_BOTH); canvas.setLayoutData(data); final Graphics2DRenderer renderer = new Graphics2DRenderer(); canvas.addPaintListener(new PaintListener() { public void paintControl(PaintEvent e) { Point controlSize = ((Control) e.getSource()).getSize(); GC gc = e.gc; // gets the SWT graphics context from the event renderer.prepareRendering(gc); // prepares the Graphics2D // renderer // gets the Graphics2D context and switch on the antialiasing Graphics2D g2d = renderer.getGraphics2D(); g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON); // paints the background with a color gradient g2d.setPaint(new GradientPaint(0.0f, 0.0f, java.awt.Color.yellow, (float) controlSize.x, (float) controlSize.y, java.awt.Color.white)); g2d.fillRect(0, 0, controlSize.x, controlSize.y); // draws rotated text g2d.setFont(new java.awt.Font("SansSerif", java.awt.Font.BOLD, 16)); g2d.setColor(java.awt.Color.blue); g2d.translate(controlSize.x / 2, controlSize.y / 2); int nbOfSlices = 18; for (int i = 0; i < nbOfSlices; i++) { g2d.drawString("Angle = " + (i * 360 / nbOfSlices) + "\u00B0", 30, 0); g2d.rotate(-2 * Math.PI / nbOfSlices); } // now that we are done with Java2D, renders Graphics2D // operation // on the SWT graphics context renderer.render(gc); // now we can continue with pure SWT paint operations gc.drawOval(0, 0, controlSize.x, controlSize.y); } }); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); renderer.dispose(); System.exit(0); } } /* * ----------------------------------------------------------------------------- * (c) Copyright IBM Corp. 2004 All rights reserved. * * The sample program(s) is/are owned by International Business Machines * Corporation or one of its subsidiaries ("IBM") and is/are copyrighted and * licensed, not sold. * * You may copy, modify, and distribute this/these sample program(s) in any form * without payment to IBM, for any purpose including developing, using, * marketing or distributing programs that include or are derivative works of * the sample program(s). * * The sample program(s) is/are provided to you on an "AS IS" basis, without * warranty of any kind. IBM HEREBY EXPRESSLY DISCLAIMS ALL WARRANTIES, EITHER * EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do * not allow for the exclusion or limitation of implied warranties, so the above * limitations or exclusions may not apply to you. IBM shall not be liable for * any damages you suffer as a result of using, modifying or distributing the * sample program(s) or its/their derivatives. * * Each copy of any portion of this/these sample program(s) or any derivative * work, must include the above copyright notice and disclaimer of warranty. * * ----------------------------------------------------------------------------- */ /** * Helper class allowing the use of Java2D on SWT or Draw2D graphical context. * * @author Yannick Saillet */ class Graphics2DRenderer { private static final PaletteData PALETTE_DATA = new PaletteData(0xFF0000, 0xFF00, 0xFF); private BufferedImage awtImage; private Image swtImage; private ImageData swtImageData; private int[] awtPixels; /** RGB value to use as transparent color */ private static final int TRANSPARENT_COLOR = 0x123456; /** * Prepare to render on a SWT graphics context. */ public void prepareRendering(GC gc) { org.eclipse.swt.graphics.Rectangle clip = gc.getClipping(); prepareRendering(clip.x, clip.y, clip.width, clip.height); } /** * Prepare to render on a Draw2D graphics context. */ public void prepareRendering(org.eclipse.draw2d.Graphics graphics) { org.eclipse.draw2d.geometry.Rectangle clip = graphics .getClip(new org.eclipse.draw2d.geometry.Rectangle()); prepareRendering(clip.x, clip.y, clip.width, clip.height); } /** * Prepare the AWT offscreen image for the rendering of the rectangular * region given as parameter. */ private void prepareRendering(int clipX, int clipY, int clipW, int clipH) { // check that the offscreen images are initialized and large enough checkOffScreenImages(clipW, clipH); // fill the region in the AWT image with the transparent color java.awt.Graphics awtGraphics = awtImage.getGraphics(); awtGraphics.setColor(new java.awt.Color(TRANSPARENT_COLOR)); awtGraphics.fillRect(clipX, clipY, clipW, clipH); } /** * Returns the Graphics2D context to use. */ public Graphics2D getGraphics2D() { if (awtImage == null) return null; return (Graphics2D) awtImage.getGraphics(); } /** * Complete the rendering by flushing the 2D renderer on a SWT graphical * context. */ public void render(GC gc) { if (awtImage == null) return; org.eclipse.swt.graphics.Rectangle clip = gc.getClipping(); transferPixels(clip.x, clip.y, clip.width, clip.height); gc.drawImage(swtImage, clip.x, clip.y, clip.width, clip.height, clip.x, clip.y, clip.width, clip.height); } /** * Complete the rendering by flushing the 2D renderer on a Draw2D graphical * context. */ public void render(org.eclipse.draw2d.Graphics graphics) { if (awtImage == null) return; org.eclipse.draw2d.geometry.Rectangle clip = graphics .getClip(new org.eclipse.draw2d.geometry.Rectangle()); transferPixels(clip.x, clip.y, clip.width, clip.height); graphics.drawImage(swtImage, clip.x, clip.y, clip.width, clip.height, clip.x, clip.y, clip.width, clip.height); } /** * Transfer a rectangular region from the AWT image to the SWT image. */ private void transferPixels(int clipX, int clipY, int clipW, int clipH) { int step = swtImageData.depth / 8; byte[] data = swtImageData.data; awtImage.getRGB(clipX, clipY, clipW, clipH, awtPixels, 0, clipW); for (int i = 0; i < clipH; i++) { int idx = (clipY + i) * swtImageData.bytesPerLine + clipX * step; for (int j = 0; j < clipW; j++) { int rgb = awtPixels[j + i * clipW]; for (int k = swtImageData.depth - 8; k >= 0; k -= 8) { data[idx++] = (byte) ((rgb >> k) & 0xFF); } } } if (swtImage != null) swtImage.dispose(); swtImage = new Image(Display.getDefault(), swtImageData); } /** * Dispose the resources attached to this 2D renderer. */ public void dispose() { if (awtImage != null) awtImage.flush(); if (swtImage != null) swtImage.dispose(); awtImage = null; swtImageData = null; awtPixels = null; } /** * Ensure that the offscreen images are initialized and are at least as * large as the size given as parameter. */ private void checkOffScreenImages(int width, int height) { int currentImageWidth = 0; int currentImageHeight = 0; if (swtImage != null) { currentImageWidth = swtImage.getImageData().width; currentImageHeight = swtImage.getImageData().height; } // if the offscreen images are too small, recreate them if (width > currentImageWidth || height > currentImageHeight) { dispose(); width = Math.max(width, currentImageWidth); height = Math.max(height, currentImageHeight); awtImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB); swtImageData = new ImageData(width, height, 24, PALETTE_DATA); swtImageData.transparentPixel = TRANSPARENT_COLOR; awtPixels = new int[width * height]; } } } |
[출처] http://www.java2s.com/Code/Java/SWT-JFace-Eclipse/UseofJava2DonSWTorDraw2Dgraphicalcontext.htm
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