Java tutorial
/* * @(#)Pyramid2Cube.java 1.18 02/10/21 13:45:50 * * 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.util.Enumeration; import javax.media.j3d.Alpha; import javax.media.j3d.Appearance; import javax.media.j3d.Background; import javax.media.j3d.Behavior; import javax.media.j3d.BoundingSphere; import javax.media.j3d.BranchGroup; import javax.media.j3d.Canvas3D; import javax.media.j3d.GeometryArray; import javax.media.j3d.Morph; import javax.media.j3d.QuadArray; import javax.media.j3d.Shape3D; import javax.media.j3d.Transform3D; import javax.media.j3d.TransformGroup; import javax.media.j3d.WakeupOnElapsedFrames; import javax.vecmath.Color3f; import javax.vecmath.Point3d; import javax.vecmath.Vector3d; import com.sun.j3d.utils.applet.MainFrame; import com.sun.j3d.utils.universe.SimpleUniverse; public class Pyramid2Cube extends Applet { private SimpleUniverse u = null; private BranchGroup createSceneGraph() { // Create the root of the branch graph BranchGroup objRoot = new BranchGroup(); // Create a Transformgroup to scale all objects so they // appear in the scene. TransformGroup objScale = new TransformGroup(); Transform3D t3d = new Transform3D(); t3d.setScale(0.4); objScale.setTransform(t3d); objRoot.addChild(objScale); // Create a bounds for the background and behavior BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0); // Set up the background Color3f bgColor = new Color3f(0.05f, 0.05f, 0.2f); Background bg = new Background(bgColor); bg.setApplicationBounds(bounds); objScale.addChild(bg); // // Create the transform group nodes for the 3 original objects // and the morphed object. Add them to the root of the // branch graph. // TransformGroup objTrans[] = new TransformGroup[4]; for (int i = 0; i < 4; i++) { objTrans[i] = new TransformGroup(); objScale.addChild(objTrans[i]); } Transform3D tr = new Transform3D(); Transform3D rotY15 = new Transform3D(); rotY15.rotY(15.0 * Math.PI / 180.0); objTrans[0].getTransform(tr); tr.setTranslation(new Vector3d(-3.0, 1.5, -6.5)); tr.mul(rotY15); objTrans[0].setTransform(tr); objTrans[1].getTransform(tr); tr.setTranslation(new Vector3d(0.0, 1.5, -6.5)); tr.mul(rotY15); objTrans[1].setTransform(tr); objTrans[2].getTransform(tr); tr.setTranslation(new Vector3d(3.0, 1.5, -6.5)); tr.mul(rotY15); objTrans[2].setTransform(tr); objTrans[3].getTransform(tr); tr.setTranslation(new Vector3d(0.0, -2.0, -5.0)); tr.mul(rotY15); objTrans[3].setTransform(tr); // Now create simple geometries. QuadArray g[] = new QuadArray[3]; Shape3D shape[] = new Shape3D[3]; for (int i = 0; i < 3; i++) { g[i] = null; shape[i] = null; } g[0] = new ColorPyramidUp(); g[1] = new ColorCube(); g[2] = new ColorPyramidDown(); Appearance a = new Appearance(); for (int i = 0; i < 3; i++) { shape[i] = new Shape3D(g[i], a); objTrans[i].addChild(shape[i]); } // // Create a Morph node, and set the appearance and input geometry // arrays. Set the Morph node's capability bits to allow the weights // to be modified at runtime. // Morph morph = new Morph((GeometryArray[]) g, a); morph.setCapability(Morph.ALLOW_WEIGHTS_READ); morph.setCapability(Morph.ALLOW_WEIGHTS_WRITE); objTrans[3].addChild(morph); // Now create the Alpha object that controls the speed of the // morphing operation. Alpha morphAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE | Alpha.DECREASING_ENABLE, 0, 0, 4000, 1000, 500, 4000, 1000, 500); // Finally, create the morphing behavior MorphingBehavior mBeh = new MorphingBehavior(morphAlpha, morph); mBeh.setSchedulingBounds(bounds); objScale.addChild(mBeh); return objRoot; } public Pyramid2Cube() { } public void init() { setLayout(new BorderLayout()); GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration(); Canvas3D c = new Canvas3D(config); add("Center", c); // Create a simple scene and attach it to the virtual universe BranchGroup scene = createSceneGraph(); u = new SimpleUniverse(c); // This will move the ViewPlatform back a bit so the // objects in the scene can be viewed. u.getViewingPlatform().setNominalViewingTransform(); u.addBranchGraph(scene); } public void destroy() { u.cleanup(); } public static void main(String[] args) { new MainFrame(new Pyramid2Cube(), 700, 700); } } class ColorPyramidUp extends QuadArray { private static final float[] verts = { // front face 1.0f, -1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, -1.0f, -1.0f, 1.0f, // back face -1.0f, -1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, -1.0f, -1.0f, // right face 1.0f, -1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, -1.0f, 1.0f, // left face -1.0f, -1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, -1.0f, -1.0f, -1.0f, // top face 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // bottom face -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f, 1.0f, }; private static final float[] colors = { // front face (cyan) 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, // back face (magenta) 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, // right face (yellow) 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, // left face (blue) 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, // top face (green) 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // bottom face (red) 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, }; ColorPyramidUp() { super(24, QuadArray.COORDINATES | QuadArray.COLOR_3); setCoordinates(0, verts); setColors(0, colors); } } class ColorCube extends QuadArray { private static final float[] verts = { // front face 1.0f, -1.0f, 1.0f, 1.0f, 1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f, -1.0f, 1.0f, // back face -1.0f, -1.0f, -1.0f, -1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f, 1.0f, -1.0f, -1.0f, // right face 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, -1.0f, 1.0f, 1.0f, 1.0f, 1.0f, -1.0f, 1.0f, // left face -1.0f, -1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f, 1.0f, -1.0f, -1.0f, -1.0f, -1.0f, // top face 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, // bottom face -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f, 1.0f, }; private static final float[] colors = { // front face (red) 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // back face (green) 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // right face (blue) 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, // left face (yellow) 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, // top face (magenta) 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, // bottom face (cyan) 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, }; ColorCube() { super(24, QuadArray.COORDINATES | QuadArray.COLOR_3); setCoordinates(0, verts); setColors(0, colors); } } class ColorPyramidDown extends QuadArray { private static final float[] verts = { // front face 0.0f, -1.0f, 0.0f, 1.0f, 1.0f, 1.0f, -1.0f, 1.0f, 1.0f, 0.0f, -1.0f, 0.0f, // back face 0.0f, -1.0f, 0.0f, -1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f, 0.0f, -1.0f, 0.0f, // right face 0.0f, -1.0f, 0.0f, 1.0f, 1.0f, -1.0f, 1.0f, 1.0f, 1.0f, 0.0f, -1.0f, 0.0f, // left face 0.0f, -1.0f, 0.0f, -1.0f, 1.0f, 1.0f, -1.0f, 1.0f, -1.0f, 0.0f, -1.0f, 0.0f, // top face 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, // bottom face 0.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, }; private static final float[] colors = { // front face (green) 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // back face (red) 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // right face (yellow) 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, // left face (magenta) 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, // top face (blue) 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, // bottom face (cyan) 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, }; ColorPyramidDown() { super(24, QuadArray.COORDINATES | QuadArray.COLOR_3); setCoordinates(0, verts); setColors(0, colors); } } //User-defined morphing behavior class class MorphingBehavior extends Behavior { Alpha alpha; Morph morph; double weights[]; WakeupOnElapsedFrames w = new WakeupOnElapsedFrames(0); // Override Behavior's initialize method to setup wakeup criteria public void initialize() { alpha.setStartTime(System.currentTimeMillis()); // Establish initial wakeup criteria wakeupOn(w); } // Override Behavior's stimulus method to handle the event public void processStimulus(Enumeration criteria) { // NOTE: This assumes 3 objects. It should be generalized to // "n" objects. double val = alpha.value(); if (val < 0.5) { double a = val * 2.0; weights[0] = 1.0 - a; weights[1] = a; weights[2] = 0.0; } else { double a = (val - 0.5) * 2.0; weights[0] = 0.0; weights[1] = 1.0f - a; weights[2] = a; } morph.setWeights(weights); // Set wakeup criteria for next time wakeupOn(w); } public MorphingBehavior(Alpha a, Morph m) { alpha = a; morph = m; weights = morph.getWeights(); } }