texline.java

java 3d 系列源码

import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Frame;
import java.awt.event.*;
import com.sun.j3d.utils.applet.MainFrame; 
import com.sun.j3d.utils.universe.*;
import com.sun.j3d.utils.image.TextureLoader;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.awt.GraphicsConfiguration;

public class TexLine extends Applet {

	Shape3D createBand() {
		Shape3D band = new Shape3D();
		band.setGeometry(createBandGeometry());
		band.setAppearance(createAppearance());
		return band;
	}

	Geometry createBandGeometry(){

		TriangleStripArray bandStrip; 
		Color3f cyan  = new Color3f(0.0f, 1.0f, 1.0f);
		Point2f TexPnt1 = new Point2f(0.0f, 0.0f);
		Point2f TexPnt2 = new Point2f(1.0f, 1.0f);

		// create triangle strip for twist
		int n = 60;
		int counts[] = {n};
		bandStrip = new TriangleStripArray(n,
										   TriangleStripArray.COORDINATES  | TriangleStripArray.COLOR_3
										   | TriangleStripArray.TEXTURE_COORDINATE_2,
										   counts);

		double a;
		int v;
		for(v = 0, a=0.0; v < n; v+=2, a=v*2.0*Math.PI/(n-2)){
			bandStrip.setCoordinate(v, new Point3d(
												   0.7*Math.sin(a),
												   0.3,
												   0.7*Math.cos(a)));
			bandStrip.setCoordinate(v+1, new Point3d(
													 0.7*Math.sin(a),
													 -0.3,
													 0.7*Math.cos(a)));
			bandStrip.setColor(v, cyan);
			bandStrip.setColor(v+1, cyan);
			bandStrip.setTextureCoordinate(v, TexPnt1);
			bandStrip.setTextureCoordinate(v+1, TexPnt2);
		}
		return bandStrip;
	}
	
	Appearance createAppearance(){

		Appearance app = new Appearance();

		PolygonAttributes myPA = new PolygonAttributes();
		myPA.setCullFace(PolygonAttributes.CULL_NONE);
		myPA.setPolygonMode(PolygonAttributes.POLYGON_LINE);
		app.setPolygonAttributes(myPA);

		String filename = "grid4.gif";
		TextureLoader myTL = new TextureLoader(filename, this);
		ImageComponent2D image = myTL.getImage();
		Texture2D myTex=(Texture2D)myTL.getTexture();
		app.setTexture(myTex);

		return app;
	}

	/////////////////////////////////////////////////
	//
	// create scene graph branch group
	//
	public BranchGroup createSceneGraph() {

		BranchGroup sceneRoot = new BranchGroup();

		// Create the transform group node and initialize it to the
		// identity. Add it to the root of the subgraph.
		TransformGroup objSpin = new TransformGroup();
		objSpin.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
		sceneRoot.addChild(objSpin);

		Shape3D band = createBand();
		sceneRoot.addChild(band);
		
		// a bounding sphere specifies a region a behavior is active
		// create a sphere centered at the origin with radius of 1
		BoundingSphere bounds = new BoundingSphere();


		// make background white
		Background background = new Background(1.0f, 1.0f, 1.0f);
		background.setApplicationBounds(bounds);
		sceneRoot.addChild(background);

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

		return sceneRoot;
	}
	
	
	// Create a simple scene and attach it to the virtual universe

	public TexLine() {
		setLayout(new BorderLayout());
		GraphicsConfiguration config = 
               SimpleUniverse.getPreferredConfiguration();
    	Canvas3D canvas3D=new Canvas3D(config);
		add("Center", canvas3D);

		BranchGroup scene = createSceneGraph();

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

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

		u.addBranchGraph(scene);

	}
	
	//  The following method allows this to be run as an application

	public static void main(String[] args) {

		Frame frame = new MainFrame(new TexLine(), 256, 256);
	} 
}