physics3dthread.java

运用java3D模拟刚体间的碰撞,爆炸及在万有引力作用下的运动轨迹,设置适当的参数可以模拟天体运动等多种物理现象.

		back.setGeometry(bgGeometry);
		backgroundGroup.addChild(back);
		
		return backgroundGroup;
	}
	////////////////////////////////////////////////
	
	//Get the bounding sphere for the scene
	public static BoundingSphere getBoundingSphere()
	{
		return new BoundingSphere(new Point3d(0.0,0.0,0.0), 1E13);
	}
	
	
	//Add a new particle to the system at the default position etc.
	public void addParticle()
	{
		//Unselect current selected particle
		if(lastShape != null)
			lastShape.setAppearance((Appearance)app.cloneNodeComponent(true));
		//////////////////////////
		
		//Create the new sphere
		Sphere sphere = new Sphere(0.1f, Primitive.GENERATE_NORMALS, SPHERE_DETAIL,  (Appearance)app.cloneNodeComponent(true));
		sphere.getShape().setBoundsAutoCompute(true);
		//Set all the capability bits
		sphere.getShape().setCapability(Shape3D.ALLOW_APPEARANCE_WRITE);
		sphere.getShape().setCapability(Shape3D.ALLOW_APPEARANCE_READ);
		sphere.getShape().setCapability(Shape3D.ALLOW_GEOMETRY_WRITE);
		sphere.getShape().setCapability(Shape3D.ALLOW_GEOMETRY_READ);
		sphere.getShape().setCapability(Shape3D.ALLOW_BOUNDS_READ);
		
		//Set the sphere geometry to be unique (for exploding purposes, otherwise everything explodes...)
		try
		{
			sphere.getShape().setGeometry((Geometry)sphere.getShape().getGeometry().cloneNodeComponent(true));
			sphere.getShape().getGeometry().setCapability( GeometryArray.ALLOW_COORDINATE_READ );
			sphere.getShape().getGeometry().setCapability( GeometryArray.ALLOW_COORDINATE_WRITE );
			sphere.getShape().getGeometry().setCapability( GeometryArray.ALLOW_COUNT_READ );
			
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		////////////////////////////////////////////////
		
		//Set the appearance and selectedShape
		sphere.getShape().setAppearance((Appearance)selectedApp.cloneNodeComponent(true));
		lastShape = sphere.getShape();
		
		//Create main transform group
		TransformGroup tg = new TransformGroup();
		Transform3D t3d = new Transform3D();
		tg.setTransform(t3d);
		tg.addChild(sphere);
		tg.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
		tg.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
		tg.setCapability(TransformGroup.ALLOW_BOUNDS_READ);
		//////////////////////////////////////
		
		//Create branch group
		BranchGroup bg = new BranchGroup();
		bg.setCapability(BranchGroup.ALLOW_CHILDREN_EXTEND);
		bg.setCapability(BranchGroup.ALLOW_DETACH);
		bg.setCapability(BranchGroup.ALLOW_CHILDREN_WRITE);
		bg.addChild(tg);
		////////////////////////
		
		//Finally create the particle3D
		Particle3D p3d = new Particle3D("Unamed Particle", tg, new Vector3d(0.0,0.0,0.0), 100.0, new Vector3d(0.0,0.0,0.0), bg, sphere.getShape(), 1);
		////////////////////////////////
		
		//Set the userdata to that p3d (for picking purposes)
		sphere.getShape().setUserData(p3d);
		
		//Add the new particle to the bgroot
		bgRoot.addChild(bg);
		
		//Set the selected object in the properties frame
		pframe.setObject(p3d);
	
	}
	
	//Add a new particle to the system with specified positon etc.
	public void addParticle(String name, Vector3d position, Vector3d velocity, double mass, double radius, double elasticity)
	{
//Unselect current selected particle
		if(lastShape != null)
			lastShape.setAppearance((Appearance)app.cloneNodeComponent(true));
		//////////////////////////
		
		//Create the new sphere
		Sphere sphere = new Sphere(0.1f, Primitive.GENERATE_NORMALS, SPHERE_DETAIL,  (Appearance)app.cloneNodeComponent(true));
		sphere.getShape().setBoundsAutoCompute(true);
		//Set all the capability bits
		sphere.getShape().setCapability(Shape3D.ALLOW_APPEARANCE_WRITE);
		sphere.getShape().setCapability(Shape3D.ALLOW_APPEARANCE_READ);
		sphere.getShape().setCapability(Shape3D.ALLOW_GEOMETRY_WRITE);
		sphere.getShape().setCapability(Shape3D.ALLOW_GEOMETRY_READ);
		sphere.getShape().setCapability(Shape3D.ALLOW_BOUNDS_READ);
		
		
		//Set the sphere geometry to be unique (for exploding purposes, otherwise everything explodes...)
		try
		{
			sphere.getShape().setGeometry((Geometry)sphere.getShape().getGeometry().cloneNodeComponent(true));
			sphere.getShape().getGeometry().setCapability( GeometryArray.ALLOW_COORDINATE_READ );
			sphere.getShape().getGeometry().setCapability( GeometryArray.ALLOW_COORDINATE_WRITE );
			sphere.getShape().getGeometry().setCapability( GeometryArray.ALLOW_COUNT_READ );
			
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		////////////////////////////////////////////////
		
		//Set the appearance and selectedShape
		sphere.getShape().setAppearance((Appearance)selectedApp.cloneNodeComponent(true));
		lastShape = sphere.getShape();
		
		//Create main transform group
		TransformGroup tg = new TransformGroup();
		Transform3D t3d = new Transform3D();
		tg.setTransform(t3d);
		tg.addChild(sphere);
		tg.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
		tg.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
		tg.setCapability(TransformGroup.ALLOW_BOUNDS_READ);
		//////////////////////////////////////
		
		//Create branch group
		BranchGroup bg = new BranchGroup();
		bg.setCapability(BranchGroup.ALLOW_CHILDREN_EXTEND);
		bg.setCapability(BranchGroup.ALLOW_DETACH);
		bg.setCapability(BranchGroup.ALLOW_CHILDREN_WRITE);
		bg.addChild(tg);
		////////////////////////
		
		//Finally create the particle3D
		Particle3D p3d = new Particle3D("Unamed Particle", tg, new Vector3d(0.0,0.0,0.0), 100.0, new Vector3d(0.0,0.0,0.0), bg, sphere.getShape(), 1);
		p3d.setMass(mass);
		p3d.setRadius(radius);
		p3d.setSpeed(velocity);
		p3d.setPosition(position);
		////////////////////////////////
		
		//Set the userdata to that p3d (for picking purposes)
		sphere.getShape().setUserData(p3d);
		
		//Add the new particle to the bgroot
		bgRoot.addChild(bg);
		
		//Set the selected object in the properties frame
		pframe.setObject(p3d);	
	}
	
	//Ste the view to zoomDistance away from 0.0,0.0,0.0 looking down the z axis
	public void setView(double zoomDistance)
	{
		TransformGroup tg = u.getViewingPlatform().getViewPlatformTransform();
		Transform3D t3d = new Transform3D();
		t3d.setTranslation(new Vector3d(0.0, 0.0, zoomDistance));
		tg.setTransform(t3d);
	}
	
	
	
	//Mouse Listeners for the Canvas 3D
	
	//Shape selection
	public void mouseClicked(MouseEvent e)
	{
		//Set last shape appearance back to normal
		if(lastShape != null)
			lastShape.setAppearance((Appearance)app.cloneNodeComponent(true));
		//////////////////////////////////////////
		
		//Tell the pick canvas where the click happened
		pickCanvas.setShapeLocation(e);
		
		//Get the result
     	PickResult result = pickCanvas.pickClosest();
     	
     	//if the result exists..
     	if(result != null && (Particle3D)result.getObject().getUserData() != null)
	    { 	
	    	//Get the shape
	    	lastShape = (Shape3D)result.getObject();
	    	System.out.println("We have got a match..");
	    	System.out.flush();
	    	
	    	lastShape.setAppearance((Appearance)selectedApp.cloneNodeComponent(true));
	    	
	    	//Get the particle3d from the user data	
	    	Particle3D currentParticle = ((Particle3D)result.getObject().getUserData());
	    
	    	//Set the object in the pframe
	    	pframe.setObject(currentParticle);
	    }
	    else
	    {
	    	//Clear selected object
	    	lastShape = null;
			//Clear Properties Frame
	    	pframe.setObject(null);
     	}
	}
	
	//Sets the last shape
	public void setLastShape(Shape3D shape)
	{
		lastShape = shape;
	}
	/////////////////////////
	
	//Remove the selected object from the system
	public void removeSelectedObject()
	{
		pframe.setObject(null);
		if(lastShape != null)
			Particle3D.removeParticle((Particle3D)lastShape.getUserData());
	}
	////////////////////////////////
	
	//Step forward/back one step
	public void step()
	{
		Particle3D.updateAll((rewinding ? -1 : 1) * timeMultiplier * accuracy / 1000.0f);
	}
	/////////////////////////////////
	
	//Accesor functions///////////////
	public static Appearance getNormalAppearance()
	{
		return (Appearance)app.cloneNodeComponent(true);
	}
	
	public static Appearance getSelectedAppearance()
	{
		return (Appearance)selectedApp.cloneNodeComponent(true);
	}
	
	public static void setAccuracy(int newAccuracy)
	{
		accuracy = newAccuracy;
	}
	
	public static int getAccuracy()
	{
		return accuracy;
	}
	
	public static void setTimeMultiplier(float newTimeMultiplier)
	{
		timeMultiplier = newTimeMultiplier;
	}
	
	public static float getTimeMultiplier()
	{
		return timeMultiplier;
	}
	////////////////////////////////////
	
	//Unused Mouse Events
	public void mousePressed(MouseEvent e){	}
	
	public void mouseEntered(MouseEvent e){	}

	public void mouseExited(MouseEvent e){	}

	public void mouseReleased(MouseEvent e){ }
	
	
}