Mega Code Archive
Tick Tock Picking
<![CDATA[
/*
* @(#)TickTockPicking.java 1.28 02/10/21 13:58:21
*
* 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
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* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
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*/
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;
import javax.media.j3d.Alpha;
import javax.media.j3d.AmbientLight;
import javax.media.j3d.Appearance;
import javax.media.j3d.Background;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.Bounds;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.ColoringAttributes;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.Geometry;
import javax.media.j3d.Group;
import javax.media.j3d.Material;
import javax.media.j3d.PointAttributes;
import javax.media.j3d.PolygonAttributes;
import javax.media.j3d.QuadArray;
import javax.media.j3d.RotationInterpolator;
import javax.media.j3d.Shape3D;
import javax.media.j3d.TextureAttributes;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.media.j3d.TransparencyAttributes;
import javax.media.j3d.TriangleArray;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Point3f;
import javax.vecmath.TexCoord2f;
import javax.vecmath.Vector3d;
import javax.vecmath.Vector3f;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.image.TextureLoader;
import com.sun.j3d.utils.picking.PickResult;
import com.sun.j3d.utils.picking.PickTool;
import com.sun.j3d.utils.picking.behaviors.PickMouseBehavior;
import com.sun.j3d.utils.universe.SimpleUniverse;
public class TickTockPicking extends Applet {
// path the the texture map image
private java.net.URL texImage = null;
private SimpleUniverse u = null;
public BranchGroup createSceneGraph(Canvas3D c) {
// 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 behaviors
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);
// Set up the global lights
Color3f lColor1 = new Color3f(0.7f, 0.7f, 0.7f);
Vector3f lDir1 = new Vector3f(-1.0f, -1.0f, -1.0f);
Color3f alColor = new Color3f(0.2f, 0.2f, 0.2f);
AmbientLight aLgt = new AmbientLight(alColor);
aLgt.setInfluencingBounds(bounds);
DirectionalLight lgt1 = new DirectionalLight(lColor1, lDir1);
lgt1.setInfluencingBounds(bounds);
objScale.addChild(aLgt);
objScale.addChild(lgt1);
// Create a pair of transform group nodes and initialize them to
// identity. Enable the TRANSFORM_WRITE capability so that
// our behaviors can modify them at runtime. Add them to the
// root of the subgraph.
TransformGroup objTrans1 = new TransformGroup();
objTrans1.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objScale.addChild(objTrans1);
TransformGroup objTrans2 = new TransformGroup();
objTrans2.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objTrans1.addChild(objTrans2);
// Create the positioning and scaling transform group node.
Transform3D t = new Transform3D();
t.set(0.3, new Vector3d(0.0, -1.5, 0.0));
TransformGroup objTrans3 = new TransformGroup(t);
objTrans2.addChild(objTrans3);
// Create a simple shape leaf node, set it's appearance, and
// add it to the scene graph.
Shape3D shape = new Cube();
Appearance a = new Appearance();
Color3f black = new Color3f(0.0f, 0.0f, 0.0f);
Color3f white = new Color3f(1.0f, 1.0f, 1.0f);
Color3f objColor = new Color3f(0.8f, 0.0f, 0.0f);
a.setMaterial(new Material(objColor, black, objColor, white, 80.0f));
shape.setAppearance(a);
shape.setCapability(shape.ALLOW_APPEARANCE_READ);
shape.setCapability(shape.ALLOW_APPEARANCE_WRITE);
objTrans3.addChild(shape);
// Create a new Behavior object that will perform the desired
// rotation on the specified transform object and add it into
// the scene graph.
Transform3D yAxis1 = new Transform3D();
yAxis1.rotX(Math.PI / 2.0);
Alpha tickTockAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE
| Alpha.DECREASING_ENABLE, 0, 0, 5000, 2500, 200, 5000, 2500,
200);
RotationInterpolator tickTock = new RotationInterpolator(tickTockAlpha,
objTrans1, yAxis1, -(float) Math.PI / 2.0f,
(float) Math.PI / 2.0f);
tickTock.setSchedulingBounds(bounds);
objTrans2.addChild(tickTock);
// Create a new Behavior object that will perform the desired
// rotation on the specified transform object and add it into
// the scene graph.
Transform3D yAxis2 = new Transform3D();
Alpha rotationAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE, 0, 0,
4000, 0, 0, 0, 0, 0);
RotationInterpolator rotator = new RotationInterpolator(rotationAlpha,
objTrans2, yAxis2, 0.0f, (float) Math.PI * 2.0f);
rotator.setSchedulingBounds(bounds);
objTrans2.addChild(rotator);
// Now create the simple picking behavior
PickHighlightBehavior pickBeh = new PickHighlightBehavior(c, objRoot,
bounds);
// Create a bunch of objects with a behavior and add them
// into the scene graph.
int row, col;
Appearance[][] app = new Appearance[3][3];
for (row = 0; row < 3; row++)
for (col = 0; col < 3; col++)
app[row][col] = createAppearance(row * 3 + col);
for (int i = 0; i < 3; i++) {
double ypos = (double) (i - 1) * 1.5;
for (int j = 0; j < 3; j++) {
double xpos = (double) (j - 1) * 1.5;
objScale.addChild(createObject(app[i][j], 0.3, xpos, ypos));
}
}
// Have Java 3D perform optimizations on this scene graph.
objRoot.compile();
return objRoot;
}
private Appearance createAppearance(int idx) {
Appearance app = new Appearance();
// Globally used colors
Color3f black = new Color3f(0.0f, 0.0f, 0.0f);
Color3f white = new Color3f(1.0f, 1.0f, 1.0f);
switch (idx) {
// Unlit solid
case 0: {
// Set up the coloring properties
Color3f objColor = new Color3f(1.0f, 0.2f, 0.4f);
ColoringAttributes ca = new ColoringAttributes();
ca.setColor(objColor);
app.setColoringAttributes(ca);
break;
}
// Unlit wire frame
case 1: {
// Set up the coloring properties
Color3f objColor = new Color3f(1.0f, 0.4f, 0.0f);
ColoringAttributes ca = new ColoringAttributes();
ca.setColor(objColor);
app.setColoringAttributes(ca);
// Set up the polygon attributes
PolygonAttributes pa = new PolygonAttributes();
pa.setPolygonMode(pa.POLYGON_LINE);
pa.setCullFace(pa.CULL_NONE);
app.setPolygonAttributes(pa);
break;
}
// Unlit points
case 2: {
// Set up the coloring properties
Color3f objColor = new Color3f(1.0f, 1.0f, 0.0f);
ColoringAttributes ca = new ColoringAttributes();
ca.setColor(objColor);
app.setColoringAttributes(ca);
// Set up the polygon attributes
PolygonAttributes pa = new PolygonAttributes();
pa.setPolygonMode(pa.POLYGON_POINT);
pa.setCullFace(pa.CULL_NONE);
app.setPolygonAttributes(pa);
// Set up point attributes
PointAttributes pta = new PointAttributes();
pta.setPointSize(5.0f);
app.setPointAttributes(pta);
break;
}
// Lit solid
case 3: {
// Set up the material properties
Color3f objColor = new Color3f(0.8f, 0.0f, 0.0f);
app.setMaterial(new Material(objColor, black, objColor, white,
80.0f));
break;
}
// Texture mapped, lit solid
case 4: {
// Set up the texture map
TextureLoader tex = new TextureLoader(texImage, this);
app.setTexture(tex.getTexture());
TextureAttributes texAttr = new TextureAttributes();
texAttr.setTextureMode(TextureAttributes.MODULATE);
app.setTextureAttributes(texAttr);
// Set up the material properties
app.setMaterial(new Material(white, black, white, black, 1.0f));
break;
}
// Transparent, lit solid
case 5: {
// Set up the transparency properties
TransparencyAttributes ta = new TransparencyAttributes();
ta.setTransparencyMode(ta.BLENDED);
ta.setTransparency(0.6f);
app.setTransparencyAttributes(ta);
// Set up the polygon attributes
PolygonAttributes pa = new PolygonAttributes();
pa.setCullFace(pa.CULL_NONE);
app.setPolygonAttributes(pa);
// Set up the material properties
Color3f objColor = new Color3f(0.7f, 0.8f, 1.0f);
app
.setMaterial(new Material(objColor, black, objColor, black,
1.0f));
break;
}
// Lit solid, no specular
case 6: {
// Set up the material properties
Color3f objColor = new Color3f(0.8f, 0.0f, 0.0f);
app.setMaterial(new Material(objColor, black, objColor, black,
80.0f));
break;
}
// Lit solid, specular only
case 7: {
// Set up the material properties
Color3f objColor = new Color3f(0.8f, 0.0f, 0.0f);
app.setMaterial(new Material(black, black, black, white, 80.0f));
break;
}
// Another lit solid with a different color
case 8: {
// Set up the material properties
Color3f objColor = new Color3f(0.8f, 0.8f, 0.0f);
app.setMaterial(new Material(objColor, black, objColor, white,
80.0f));
break;
}
default: {
ColoringAttributes ca = new ColoringAttributes();
ca.setColor(new Color3f(0.0f, 1.0f, 0.0f));
app.setColoringAttributes(ca);
}
}
return app;
}
private Group createObject(Appearance app, double scale, double xpos,
double ypos) {
// Create a transform group node to scale and position the object.
Transform3D t = new Transform3D();
t.set(scale, new Vector3d(xpos, ypos, 0.0));
TransformGroup objTrans = new TransformGroup(t);
// Create a second transform group node and initialize it to the
// identity. Enable the TRANSFORM_WRITE capability so that
// our behavior code can modify it at runtime.
TransformGroup spinTg = new TransformGroup();
spinTg.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
spinTg.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
// Create a simple shape leaf node and set the appearance
Shape3D shape = new Tetrahedron();
shape.setAppearance(app);
shape.setCapability(shape.ALLOW_APPEARANCE_READ);
shape.setCapability(shape.ALLOW_APPEARANCE_WRITE);
// add it to the scene graph.
spinTg.addChild(shape);
// Create a new Behavior object that will perform the desired
// operation on the specified transform object and add it into
// the scene graph.
Transform3D yAxis = new Transform3D();
Alpha rotationAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE, 0, 0,
5000, 0, 0, 0, 0, 0);
RotationInterpolator rotator = new RotationInterpolator(rotationAlpha,
spinTg, 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);
// Add the behavior and the transform group to the object
objTrans.addChild(rotator);
objTrans.addChild(spinTg);
return objTrans;
}
public TickTockPicking() {
}
public TickTockPicking(java.net.URL url) {
texImage = url;
}
public void init() {
if (texImage == null) {
// the path to the image for an applet
try {
texImage = new java.net.URL(getCodeBase().toString()
+ "/apimage.jpg");
} catch (java.net.MalformedURLException ex) {
System.out.println(ex.getMessage());
System.exit(1);
}
}
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(c);
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();
}
//
// The following allows TickTockPicking to be run as an application
// as well as an applet
//
public static void main(String[] args) {
// the path the the texture map for an application
java.net.URL url = null;
try {
url = new java.net.URL("file:apimage.jpg");
} catch (java.net.MalformedURLException ex) {
System.out.println(ex.getMessage());
System.exit(1);
}
new MainFrame(new TickTockPicking(url), 700, 700);
}
}
class Tetrahedron extends Shape3D {
private static final float sqrt3 = (float) Math.sqrt(3.0);
private static final float sqrt3_3 = sqrt3 / 3.0f;
private static final float sqrt24_3 = (float) Math.sqrt(24.0) / 3.0f;
private static final float ycenter = 0.5f * sqrt24_3;
private static final float zcenter = -sqrt3_3;
private static final Point3f p1 = new Point3f(-1.0f, -ycenter, -zcenter);
private static final Point3f p2 = new Point3f(1.0f, -ycenter, -zcenter);
private static final Point3f p3 = new Point3f(0.0f, -ycenter, -sqrt3
- zcenter);
private static final Point3f p4 = new Point3f(0.0f, sqrt24_3 - ycenter,
0.0f);
private static final Point3f[] verts = { p1, p2, p4, // front face
p1, p4, p3, // left, back face
p2, p3, p4, // right, back face
p1, p3, p2, // bottom face
};
private TexCoord2f texCoord[] = { new TexCoord2f(0.0f, 0.0f),
new TexCoord2f(1.0f, 0.0f), new TexCoord2f(0.5f, sqrt3 / 2.0f), };
public Tetrahedron() {
int i;
TriangleArray tetra = new TriangleArray(12, TriangleArray.COORDINATES
| TriangleArray.NORMALS | TriangleArray.TEXTURE_COORDINATE_2);
tetra.setCoordinates(0, verts);
for (i = 0; i < 12; i++) {
tetra.setTextureCoordinate(0, i, texCoord[i % 3]);
}
int face;
Vector3f normal = new Vector3f();
Vector3f v1 = new Vector3f();
Vector3f v2 = new Vector3f();
Point3f[] pts = new Point3f[3];
for (i = 0; i < 3; i++)
pts[i] = new Point3f();
for (face = 0; face < 4; face++) {
tetra.getCoordinates(face * 3, pts);
v1.sub(pts[1], pts[0]);
v2.sub(pts[2], pts[0]);
normal.cross(v1, v2);
normal.normalize();
for (i = 0; i < 3; i++) {
tetra.setNormal((face * 3 + i), normal);
}
}
tetra.setCapability(Geometry.ALLOW_INTERSECT);
this.setGeometry(tetra);
this.setAppearance(new Appearance());
}
}
class Cube extends Shape3D {
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 Vector3f[] normals = { new Vector3f(0.0f, 0.0f, 1.0f), // front
// face
new Vector3f(0.0f, 0.0f, -1.0f), // back face
new Vector3f(1.0f, 0.0f, 0.0f), // right face
new Vector3f(-1.0f, 0.0f, 0.0f), // left face
new Vector3f(0.0f, 1.0f, 0.0f), // top face
new Vector3f(0.0f, -1.0f, 0.0f), // bottom face
};
public Cube() {
super();
int i;
QuadArray cube = new QuadArray(24, QuadArray.COORDINATES
| QuadArray.NORMALS);
cube.setCoordinates(0, verts);
for (i = 0; i < 24; i++) {
cube.setNormal(i, normals[i / 4]);
}
cube.setCapability(Geometry.ALLOW_INTERSECT);
setGeometry(cube);
setAppearance(new Appearance());
}
}
class PickHighlightBehavior extends PickMouseBehavior {
Appearance savedAppearance = null;
Shape3D oldShape = null;
Appearance highlightAppearance;
public PickHighlightBehavior(Canvas3D canvas, BranchGroup root,
Bounds bounds) {
super(canvas, root, bounds);
this.setSchedulingBounds(bounds);
root.addChild(this);
Color3f white = new Color3f(1.0f, 1.0f, 1.0f);
Color3f black = new Color3f(0.0f, 0.0f, 0.0f);
Color3f highlightColor = new Color3f(0.0f, 1.0f, 0.0f);
Material highlightMaterial = new Material(highlightColor, black,
highlightColor, white, 80.0f);
highlightAppearance = new Appearance();
highlightAppearance.setMaterial(new Material(highlightColor, black,
highlightColor, white, 80.0f));
pickCanvas.setMode(PickTool.BOUNDS);
}
public void updateScene(int xpos, int ypos) {
PickResult pickResult = null;
Shape3D shape = null;
pickCanvas.setShapeLocation(xpos, ypos);
pickResult = pickCanvas.pickClosest();
if (pickResult != null) {
shape = (Shape3D) pickResult.getNode(PickResult.SHAPE3D);
}
if (oldShape != null) {
oldShape.setAppearance(savedAppearance);
}
if (shape != null) {
savedAppearance = shape.getAppearance();
oldShape = shape;
shape.setAppearance(highlightAppearance);
}
}
}
]]>