java3D 箭头

msh24

public class Pos extends Applet {private static final long serialVersionUID = 1L;float knot[] = { 0.0f,  1.0f };Color3f color = new Color3f(0.0f, 0.0f, 1.0f);Color3f c[] = { color,  color };private BranchGroup createSceneGraph() {BranchGroup objRoot = new BranchGroup();BoundingSphere bound = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 50.);Color3f color = new Color3f(0f, 0f, 255f);Point3f pos[] = { new Point3f(-1f, 0.4f, 0.0f), new Point3f(1f, 0.4f, 0.0f),};Point3f pos1[] = { new Point3f(-1f, -0.4f, 0.0f), new Point3f(1f, -0.4f, 0.0f),};Point3f pos2[] = { new Point3f(-3f, 0.4f, 0.0f), new Point3f(-1.f, 0.4f, 0.0f),};Point3f pos3[] = { new Point3f(-3f, -0.4f, 0.0f), new Point3f(-1.f, -0.4f, 0.0f),};Point3f pos4[] = { new Point3f(1f, 0.4f, 0.0f), new Point3f(3f, 0.4f, 0.0f),};Point3f pos5[] = { new Point3f(1f, -0.4f, 0.0f), new Point3f(3f, -0.4f, 0.0f),};draw(objRoot, bound, 0d, 0d, 170d, color, pos,  2000, 0);draw(objRoot, bound, 0d, 0d, 170d, color, pos1, 2000, 0);draw(objRoot, bound, 0d, 0d, 170d, color, pos2, 2000, 0);draw(objRoot, bound, 0d, 0d, 170d, color, pos3, 2000, 0);draw(objRoot, bound, 0d, 0d, 170d, color, pos4, 2000, 0);draw(objRoot, bound, 0d, 0d, 170d, color, pos5, 2000, 0);//draw(objRoot, bound1, Math.PI/3, Math.PI/3, Math.PI/3, color, 1.f, 3.f, rotate, rotate2, 2000, 0);Color3f bgColor = new Color3f(1.0f, 1.0f, 1.0f);Background bg = new Background(bgColor);bg.setApplicationBounds(bound);objRoot.addChild(bg);return objRoot;}public Pos() {setLayout(new BorderLayout());Canvas3D c = new Canvas3D(SimpleUniverse.getPreferredConfiguration());add("Center", c);Viewer viewer = new Viewer(c);Vector3d viewpoint = new Vector3d(0.0, 0.0, 10.0);Transform3D t = new Transform3D();t.set(viewpoint);ViewingPlatform v = new ViewingPlatform();v.getViewPlatformTransform().setTransform(t);BranchGroup scene = createSceneGraph();SimpleUniverse u = new SimpleUniverse(v, viewer);u.getViewingPlatform();u.addBranchGraph(scene);}/** *  * @param objRoot * @param bound * @param directX 箭头方向 * @param directY * @param directZ * @param color3f 箭头颜色 * @param pos 运动轨迹 * @param forward 正向时间 * @param reverse 逆向时间 */public void draw(BranchGroup objRoot, BoundingSphere bound, Double directX, Double directY, Double directZ,Color3f color3f, Point3f pos[],long forward, long reverse) {Transform3D rotate = new Transform3D();rotate.rotY(Math.toRadians(directY));rotate.rotX(Math.toRadians(directX));rotate.rotZ(Math.toRadians(directZ));rotate.setScale(1.0f);rotate.setTranslation(new Vector3f(0.0f, 0.0f, 0.0f));//渲染外围动画路径Transform3D tr = new Transform3D();//tr.rotX(Math.PI/4);//tr.rotZ(Math.PI/4);tr.rotX((90+directX)*Math.PI/180);tr.rotY((90+directY)*Math.PI/180);tr.rotZ((90+directZ)*Math.PI/180);tr.setTranslation(new Vector3f(10f, 5.f, 5.0f));TransformGroup group = new TransformGroup(tr);group.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);//渲染箭头Appearance app = new Appearance();Material material = new Material();//颜色material.setEmissiveColor(color3f);app.setMaterial(material);TransformGroup transformGroup = new TransformGroup();transformGroup.setTransform(rotate);TransformGroup transformGroup1 = new TransformGroup();transformGroup1.addChild(new Cone(0.1f, 0.4f, 3, app));Transform3D rotate2 = new Transform3D();rotate2.setScale(1.0f);rotate2.setTranslation(new Vector3f(0.0f, -0.2f, 0.0f));TransformGroup transformGroup2 = new TransformGroup();transformGroup2.setTransform(rotate2);transformGroup2.addChild(new Cylinder(0.01f, 0.6f, 3, app));transformGroup.addChild(transformGroup1);transformGroup.addChild(transformGroup2);group.addChild(transformGroup);Alpha xtranAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE | Alpha.DECREASING_ENABLE, 100, 100, forward, 100, 200, reverse, 100, 0);PositionPathInterpolator tran = new PositionPathInterpolator(xtranAlpha, group, tr,  knot, pos);tran.setSchedulingBounds(bound);objRoot.addChild(group);group.addChild(tran);}public static void main(String[] args) {new MainFrame(new Pos(), 400, 400);}}

用锥形和圆柱体 组成的箭头。