Java tutorial
/* Essential Java 3D Fast Ian Palmer Publisher: Springer-Verlag ISBN: 1-85233-394-4 */ import java.awt.BorderLayout; import java.awt.Button; import java.awt.Frame; import java.awt.Panel; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.media.j3d.AmbientLight; import javax.media.j3d.BoundingSphere; import javax.media.j3d.BranchGroup; import javax.media.j3d.Canvas3D; import javax.media.j3d.DirectionalLight; import javax.media.j3d.Locale; import javax.media.j3d.PhysicalBody; import javax.media.j3d.PhysicalEnvironment; import javax.media.j3d.Transform3D; import javax.media.j3d.TransformGroup; import javax.media.j3d.View; import javax.media.j3d.ViewPlatform; import javax.media.j3d.VirtualUniverse; import javax.vecmath.Color3f; import javax.vecmath.Point3d; import javax.vecmath.Vector3f; /** * This creates a rotation interpolator and applies it to a shape. * * @author I.J.Palmer * @version 1.0 */ public class SimpleRotator extends Frame implements ActionListener { protected Canvas3D myCanvas3D = new Canvas3D(null); protected Button exitButton = new Button("Exit"); /** * This function builds the view branch of the scene graph. It creates a * branch group and then creates the necessary view elements to give a * useful view of our content. * * @param c * Canvas3D that will display the view * @return BranchGroup that is the root of the view elements */ protected BranchGroup buildViewBranch(Canvas3D c) { BranchGroup viewBranch = new BranchGroup(); Transform3D viewXfm = new Transform3D(); viewXfm.set(new Vector3f(0.0f, 0.0f, 10.0f)); TransformGroup viewXfmGroup = new TransformGroup(viewXfm); ViewPlatform myViewPlatform = new ViewPlatform(); PhysicalBody myBody = new PhysicalBody(); PhysicalEnvironment myEnvironment = new PhysicalEnvironment(); viewXfmGroup.addChild(myViewPlatform); viewBranch.addChild(viewXfmGroup); View myView = new View(); myView.addCanvas3D(c); myView.attachViewPlatform(myViewPlatform); myView.setPhysicalBody(myBody); myView.setPhysicalEnvironment(myEnvironment); return viewBranch; } /** * Add some lights so that we can illuminate the scene. This adds one * ambient light to bring up the overall lighting level and one directional * shape to show the shape of the objects in the scene. * * @param b * BranchGroup that the lights are to be added to. */ protected void addLights(BranchGroup b) { BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0); Color3f ambLightColour = new Color3f(0.5f, 0.5f, 0.5f); AmbientLight ambLight = new AmbientLight(ambLightColour); ambLight.setInfluencingBounds(bounds); Color3f dirLightColour = new Color3f(1.0f, 1.0f, 1.0f); Vector3f dirLightDir = new Vector3f(-1.0f, -1.0f, -1.0f); DirectionalLight dirLight = new DirectionalLight(dirLightColour, dirLightDir); dirLight.setInfluencingBounds(bounds); b.addChild(ambLight); b.addChild(dirLight); } /** * This builds the content branch of our scene graph. The root of the shapes * supplied as a parameter is slightly tilted to reveal its 3D shape. It * also uses the addLights function to add some lights to the scene. We also * create the alpha generator and the rotation interpolator to perform the * animation. * * @param shape * Node that represents the geometry for the content * @return BranchGroup that is the root of the content branch / protected * BranchGroup buildContentBranch(Node shape) { BranchGroup * contentBranch = new BranchGroup(); //Create the transform and * group used for the rotation Transform3D rotateCube = new * Transform3D( ); TransformGroup rotationGroup = new * TransformGroup(rotateCube); //Set the capability so we can write * the transform rotationGroup.setCapability( * TransformGroup.ALLOW_TRANSFORM_WRITE); //Create the alpha * generator Alpha rotationAlpha = new Alpha( * -1,Alpha.INCREASING_ENABLE,0,0,4000,0,0,0,0,0); //Build the * interpolator Transform3D yAxis = new Transform3D(); * RotationInterpolator rotator = new * RotationInterpolator(rotationAlpha, rotationGroup, yAxis, 0.0f, * (float) Math.PI*2.0f); BoundingSphere bounds = new * BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0); * rotator.setSchedulingBounds(bounds); //Put all this together * contentBranch.addChild(rotationGroup); * rotationGroup.addChild(shape); rotationGroup.addChild(rotator); * addLights(contentBranch); return contentBranch; } /** This * creates the shape used in the program. * @return Node that is the switch node / protected Node buildShape() { * Appearance app = new Appearance(); Color3f ambientColour = new * Color3f(1.0f,0.0f,0.0f); Color3f emissiveColour = new * Color3f(0.0f,0.0f,0.0f); Color3f specularColour = new * Color3f(1.0f,1.0f,1.0f); Color3f diffuseColour = new * Color3f(1.0f,0.0f,0.0f); float shininess = 20.0f; * app.setMaterial(new Material(ambientColour,emissiveColour, * diffuseColour,specularColour,shininess)); return new Box(2.0f, * 2.0f, 2.0f, app); } /** Process the button action to exit the * program. */ public void actionPerformed(ActionEvent e) { if (e.getSource() == exitButton) { dispose(); System.exit(0); } } public SimpleRotator() { VirtualUniverse myUniverse = new VirtualUniverse(); Locale myLocale = new Locale(myUniverse); myLocale.addBranchGraph(buildViewBranch(myCanvas3D)); // myLocale.addBranchGraph(buildContentBranch(buildShape())); setTitle("SimpleRotator"); setSize(400, 400); setLayout(new BorderLayout()); Panel bottom = new Panel(); bottom.add(exitButton); add(BorderLayout.CENTER, myCanvas3D); add(BorderLayout.SOUTH, bottom); exitButton.addActionListener(this); setVisible(true); } public static void main(String[] args) { SimpleRotator sr = new SimpleRotator(); } }