//SimpleMorph.java
//演示如何使用Morph對象
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Frame;
import com.sun.j3d.utils.applet.MainFrame; 
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;

import java.util.Enumeration;

public class SimpleMorph extends Applet {
	//創建自己的MorphBehavior對象
    public class MorphBehavior extends Behavior{
		
        private Morph targetMorph;
        private Alpha alpha;
        // the following two members are here for effciency (no memory burn)
        private double[] weights = {0, 0}; 
        private WakeupCondition trigger = new WakeupOnElapsedFrames(0);
        // create MorphBehavior
        MorphBehavior(Morph targetMorph, Alpha alpha){
            this.targetMorph = targetMorph;
            this.alpha = alpha;
        }
        public void initialize(){
            // set initial wakeup condition
            this.wakeupOn(trigger);
        }
        public void processStimulus(Enumeration criteria){
   
            weights[0] = 0;
            weights[1] = 1;

            

            float alphaValue = alpha.value();
            
                weights[0] = 1.0 - alphaValue;
                weights[1] = alphaValue;
            targetMorph.setWeights(weights);
            // set next wakeup condition
            this.wakeupOn(trigger);
        }

    } 

    public GeometryArray createGeomArray0(){
         int[] counts = {2,2,2,2,2,2};
         LineStripArray geom = new LineStripArray(12, GeometryArray.COORDINATES | GeometryArray.COLOR_3, counts);
         float[] coordinates = { -0.30f,0.00f,0f, -0.20f,0.20f,0f,
								-0.20f, 0.20f, 0f,  0.20f, 0.20f, 0f,  
								  0.20f, 0.20f, 0f,  0.30f, 0.00f, 0f, 
                                  
                                  0.20f, -0.20f, 0f, -0.20f, -0.20f, 0f,
								 0.30f, 0.00f, 0f,  0.20f, -0.20f, 0f,
								 -0.20f, -0.20f, 0f, -0.30f,0.00f, 0f
								 };
								 
         geom.setCoordinates(0, coordinates);

         return geom;
    }

    public GeometryArray createGeomArray1(){
         int[] counts = {2,2,2,2,2,2};
         LineStripArray geom = new LineStripArray(12, GeometryArray.COORDINATES | GeometryArray.COLOR_3, counts);
         float[] coordinates = {-0.20f,-0.20f,0f,-0.20f,0.20f,0f, 
								-0.20f,0.20f,0f,  0.20f,0.20f,0f,
								0.20f,0.20f,0f,  0.20f,-0.20f,0f,
								0.20f,-0.20f,0f, -0.20f,-0.20f,0f,
								
								-0.20f,0.20f,0f,  0.20f,-0.20f,0f,
								0.20f,0.20f,0f,-0.20f,-0.20f,0};
         geom.setCoordinates(0, coordinates);

	     return geom;
    }


    public BranchGroup createSceneGraph() {
	// Create the root of the branch graph
	BranchGroup objRoot = new BranchGroup();

        Transform3D t3d = new Transform3D();
        t3d.setScale(2);
        TransformGroup translate = new TransformGroup(t3d);

        // create GeometryArray[] (array of GeometryArray objects)
        GeometryArray[] geomArray = new GeometryArray[2];
        geomArray[0] = createGeomArray0();
        geomArray[1] = createGeomArray1();

        // create morph object
        Morph morphObj = new Morph(geomArray);
        morphObj.setCapability(Morph.ALLOW_WEIGHTS_WRITE);

        // create alpha object
        Alpha alpha = new Alpha(-1, 1, 0, 0, 2000, 100, 0, 0, 0, 0);

        // create morph driving behavior
        MorphBehavior morphBehav = new MorphBehavior(morphObj, alpha);
        morphBehav.setSchedulingBounds(new BoundingSphere());

        //assemble scene graph
        objRoot.addChild(translate);
        translate.addChild(morphObj);
        objRoot.addChild(morphBehav);

        Background background = new Background();
        background.setColor(1f, 1f, 1f);
        background.setApplicationBounds(new BoundingSphere());
        objRoot.addChild(background);

	// Let Java 3D perform optimizations on this scene graph.
        objRoot.compile();

	return objRoot;
    } 

    // Create a simple scene and attach it to the virtual universe

    public SimpleMorph() {
        setLayout(new BorderLayout());
        Canvas3D canvas3D = new Canvas3D(null);
        add("Center", canvas3D);

        BranchGroup scene = createSceneGraph();

        // SimpleUniverse is a Convenience Utility class
        SimpleUniverse simpleU = new SimpleUniverse(canvas3D);

	// This will move the ViewPlatform back a bit so the
	// objects in the scene can be viewed.
        simpleU.getViewingPlatform().setNominalViewingTransform();

        simpleU.addBranchGraph(scene);
    } 

    public static void main(String[] args) {
        Frame frame = new MainFrame(new SimpleMorph(), 256, 256);
    } 

}