Java tutorial
/* * @(#)OffScreenTest.java 1.13 02/10/21 13:46:49 * * Copyright (c) 1996-2002 Sun Microsystems, Inc. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistribution in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * Neither the name of Sun Microsystems, Inc. or the names of * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * This software is provided "AS IS," without a warranty of any * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR * DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN * OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR * FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR * PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. * * You acknowledge that Software is not designed,licensed or intended * for use in the design, construction, operation or maintenance of * any nuclear facility. */ import java.applet.Applet; import java.awt.BorderLayout; import java.awt.GraphicsConfiguration; import java.awt.image.BufferedImage; import javax.media.j3d.BranchGroup; import javax.media.j3d.Canvas3D; import javax.media.j3d.ImageComponent; import javax.media.j3d.ImageComponent2D; import javax.media.j3d.Raster; import javax.media.j3d.Screen3D; import javax.media.j3d.Shape3D; import javax.media.j3d.Transform3D; import javax.media.j3d.TransformGroup; import javax.media.j3d.View; import javax.vecmath.Point3f; import javax.vecmath.Vector3d; import com.sun.j3d.utils.applet.MainFrame; import com.sun.j3d.utils.geometry.ColorCube; import com.sun.j3d.utils.universe.SimpleUniverse; /** * OffScreenTest issues renderOffScreenBuffer from the postSwap callback of the * OnScreen canvas. */ public class OffScreenTest extends Applet { private SimpleUniverse u = null; public BranchGroup createSceneGraph(Raster drawRaster) { // Create the root of the branch graph BranchGroup objRoot = new BranchGroup(); // spin object has composited transformation matrix Transform3D spin = new Transform3D(); Transform3D tempspin = new Transform3D(); spin.rotX(Math.PI / 4.0d); tempspin.rotY(Math.PI / 5.0d); spin.mul(tempspin); spin.setScale(0.7); spin.setTranslation(new Vector3d(-0.4, 0.3, 0.0)); TransformGroup objTrans = new TransformGroup(spin); objRoot.addChild(objTrans); // Create a simple shape leaf node, add it to the scene graph. // ColorCube is a Convenience Utility class objTrans.addChild(new ColorCube(0.4)); //Create a raster Shape3D shape = new Shape3D(drawRaster); objRoot.addChild(shape); // Let Java 3D perform optimizations on this scene graph. objRoot.compile(); return objRoot; } public OffScreenTest() { } public void init() { setLayout(new BorderLayout()); GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration(); BufferedImage bImage = new BufferedImage(200, 200, BufferedImage.TYPE_INT_ARGB); ImageComponent2D buffer = new ImageComponent2D(ImageComponent.FORMAT_RGBA, bImage); buffer.setCapability(ImageComponent2D.ALLOW_IMAGE_READ); Raster drawRaster = new Raster(new Point3f(0.0f, 0.0f, 0.0f), Raster.RASTER_COLOR, 0, 0, 200, 200, buffer, null); drawRaster.setCapability(Raster.ALLOW_IMAGE_WRITE); // create the main scene graph BranchGroup scene = createSceneGraph(drawRaster); // create the on-screen canvas OnScreenCanvas3D d = new OnScreenCanvas3D(config, false); add("Center", d); // create a simple universe u = new SimpleUniverse(d); // This will move the ViewPlatform back a bit so the // objects in the scene can be viewed. u.getViewingPlatform().setNominalViewingTransform(); // create an off Screen Canvas OffScreenCanvas3D c = new OffScreenCanvas3D(config, true, drawRaster); // set the offscreen to match the onscreen Screen3D sOn = d.getScreen3D(); Screen3D sOff = c.getScreen3D(); sOff.setSize(sOn.getSize()); sOff.setPhysicalScreenWidth(sOn.getPhysicalScreenWidth()); sOff.setPhysicalScreenHeight(sOn.getPhysicalScreenHeight()); // attach the same view to the offscreen canvas View v = u.getViewer().getView(); v.addCanvas3D(c); // tell onscreen about the offscreen so it knows to // render to the offscreen at postswap d.setOffScreenCanvas(c); u.addBranchGraph(scene); v.stopView(); // Make sure that image are render completely // before grab it in postSwap(). d.setImageReady(); v.startView(); } public void destroy() { u.cleanup(); } public static void main(String argv[]) { new MainFrame(new OffScreenTest(), 500, 500); } } class OffScreenCanvas3D extends Canvas3D { Raster drawRaster; boolean printing = false; public OffScreenCanvas3D(GraphicsConfiguration gconfig, boolean offscreenflag, Raster drawRaster) { super(gconfig, offscreenflag); this.drawRaster = drawRaster; } public void print(boolean toWait) { if (!toWait) printing = true; BufferedImage bImage = new BufferedImage(200, 200, BufferedImage.TYPE_INT_ARGB); ImageComponent2D buffer = new ImageComponent2D(ImageComponent.FORMAT_RGBA, bImage); buffer.setCapability(ImageComponent2D.ALLOW_IMAGE_READ); this.setOffScreenBuffer(buffer); this.renderOffScreenBuffer(); if (toWait) { this.waitForOffScreenRendering(); drawOffScreenBuffer(); } } public void postSwap() { if (printing) { super.postSwap(); drawOffScreenBuffer(); printing = false; } } void drawOffScreenBuffer() { BufferedImage bImage = this.getOffScreenBuffer().getImage(); ImageComponent2D newImageComponent = new ImageComponent2D(ImageComponent.FORMAT_RGBA, bImage); drawRaster.setImage(newImageComponent); } } class OnScreenCanvas3D extends Canvas3D { OffScreenCanvas3D c; boolean print = false; boolean imageReady = false; public OnScreenCanvas3D(GraphicsConfiguration gconfig, boolean offscreenflag) { super(gconfig, offscreenflag); } public void setOffScreenCanvas(OffScreenCanvas3D c) { this.c = c; } public void setImageReady() { imageReady = true; } public void postSwap() { if (imageReady && !print) { c.print(false); print = true; } } }