例 6.22 MouseRotate、MouseTranslate、MouseWheelZoom、MouseZoom 类及 setupCallback()方法、transformChanged()方法的编程应用实例。 import java.applet.Applet; import java.awt.BorderLayout; import com.sun.j3d.utils.applet.MainFrame; import com.sun.j3d.utils.geometry.*; import com.sun.j3d.utils.universe.*; import javax.media.j3d.*; import javax.vecmath.*; import com.sun.j3d.utils.behaviors.mouse.*; import java.awt.GraphicsConfiguration; public class MouseBehaviorsC extends Applet implements MouseBehaviorCallback public BranchGroup createBranchGroupSceneGraph() BranchGroup BranchGroupRoot = new BranchGroup(); BoundingSphere bounds=new BoundingSphere(new Point3d(0.0,0.0,0.0),100); Color3f bgColor = new Color3f(1.0f,1.0f,1.0f); Background bg = new Background(bgColor); bg.setApplicationBounds(bounds); BranchGroupRoot.addChild(bg); /定义平行光 Color3f directionalColor = new Color3f(1.f,1.f,0.9f); Vector3f vec = new Vector3f(4.0f, -7.0f, -12.0f); DirectionalLight directionalLight = new DirectionalLight(directionalColor,vec); directionalLight.setInfluencingBounds(bounds); BranchGroupRoot.addChild(directionalLight); /定义总的变换 Transform3D t1 = new Transform3D(); t1.setScale(3); TransformGroup transformGroup = new TransformGroup(t1); transformGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE); transformGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_READ); BranchGroupRoot.addChild(transformGroup); /定义鼠标旋转、平移、变比对象及设置 setupCallback（）方法 MouseRotate mouseRotate = new MouseRotate(); mouseRotate.setTransformGroup(transformGroup); mouseRotate.setupCallback(this); BranchGroupRoot.addChild(mouseRotate); mouseRotate.setSchedulingBounds(bounds); MouseZoom mousezoom = new MouseZoom(); mousezoom.setTransformGroup(transformGroup); mousezoom.setupCallback(this); BranchGroupRoot.addChild(mousezoom); mousezoom.setSchedulingBounds(bounds); MouseWheelZoom mousewheelzoom = new MouseWheelZoom(); mousewheelzoom.setTransformGroup(transformGroup); mousewheelzoom.setupCallback(this); BranchGroupRoot.addChild(mousewheelzoom); mousewheelzoom.setSchedulingBounds(bounds); MouseTranslate mousetranslate = new MouseTranslate(); mousetranslate.setTransformGroup(transformGroup); mousetranslate.setupCallback(this); BranchGroupRoot.addChild(mousetranslate); mousetranslate.setSchedulingBounds(bounds); Appearance app1 = new Appearance(); Material material1 = new Material(); material1.setDiffuseColor(new Color3f(1.0f,0.0f,0.0f);material1.setCapability(Material.ALLOW_COMPONENT_WRITE); app1.setMaterial(material1); Appearance app2 = new Appearance(); Material material2 = new Material(); material2.setDiffuseColor(new Color3f(0.f,1.f,0.f); material2.setCapability(Material.ALLOW_COMPONENT_WRITE); app2.setMaterial(material2); Appearance app3 = new Appearance(); Material material3 = new Material(); material3.setDiffuseColor(new Color3f(1.f,1.f,0.f); material3.setCapability(Material.ALLOW_COMPONENT_WRITE); app3.setMaterial(material3); Appearance app4 = new Appearance(); Material material4 = new Material(); material4.setDiffuseColor(new Color3f(1.f,0.f,1.f); material4.setCapability(Material.ALLOW_COMPONENT_WRITE); app4.setMaterial(material4); /定义基本体及外观属性与坐标变换 Transform3D t = new Transform3D(); TransformGroup transformGroup1 = new TransformGroup(t); transformGroup1.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE); transformGroup1.setCapability(TransformGroup.ALLOW_TRANSFORM_READ); transformGroup1.addChild(new Sphere(0.2f, Sphere.GENERATE_NORMALS,1000,app1); Alpha colorAlpha1 = new Alpha(-1, Alpha.INCREASING_ENABLE| Alpha.DECREASING_ENABLE,0,0,3000,0,0,3000,0,0); ColorInterpolator color1 =new ColorInterpolator(colorAlpha1, material1,new Color3f(1.f,0.f,0.f),new Color3f(0.f,1.f,0.f); color1.setSchedulingBounds(bounds); transformGroup1.addChild(color1); t = new Transform3D(); TransformGroup transformGroup2 = new TransformGroup(t); transformGroup2.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE); transformGroup2.setCapability(TransformGroup.ALLOW_TRANSFORM_READ); transformGroup2.addChild(new Cylinder(0.1f,0.5f, Cylinder.GENERATE_NORMALS,120, 120,app2); Alpha colorAlpha2 = new Alpha(-1, Alpha.INCREASING_ENABLE| Alpha.DECREASING_ENABLE,0,0,3000,0,0,3000,0,0); ColorInterpolator color2=new ColorInterpolator(colorAlpha2, material2,new Color3f(0.f,1.f,0.f),new Color3f(0.f,0.f,1.f); color2.setSchedulingBounds(bounds); transformGroup2.addChild(color2); t = new Transform3D(); t.rotX(Math.PI/2); TransformGroup transformGroup3 = new TransformGroup(t); transformGroup3.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE); transformGroup3.setCapability(TransformGroup.ALLOW_TRANSFORM_READ); transformGroup3.addChild(new Cylinder(0.1f,.5f, Cylinder.GENERATE_NORMALS,120, 120,app3); Alpha colorAlpha3 = new Alpha(-1, Alpha.INCREASING_ENABLE| Alpha.DECREASING_ENABLE,0,0,3000,0,0,3000,0,0); ColorInterpolator color3=new ColorInterpolator(colorAlpha3, material3,new Color3f(0.f,0.f,1.f),new Color3f(1.f,0.f,0.f); color3.setSchedulingBounds(bounds); transformGroup3.addChild(color3); t = new Trans