Re: [java3d] How to display Points with a certain color ?

[Dan Petersen]

> 
> Hi All,
> 
> How to display points in Canvas3D ?  Thanks !
> 
> 
> -WuGang

Attached is a simple example program that does what you want.  There
aren't many comments but hopefully you can see what is going on from
the code.

Dan Petersen
Java 3D Team
Sun Microsystems

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

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

        // Create the transform group node and initialize it to the
        // identity.  Enable the TRANSFORM_WRITE capability so that
        // our behavior code can modify it at runtime.  Add it to the
        // root of the subgraph.
        TransformGroup objTrans = new TransformGroup();
        objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
        objRoot.addChild(objTrans);

        // Create a simple shape leaf node, add it to the scene graph.
        int stripCount[] = { 5 };
        PointArray pa =
          new PointArray(5, PointArray.COORDINATES);
        float coords[] = { -0.5f, -0.5f, 0.0f,
                           -0.5f,  0.5f, 0.0f,
                            0.5f,  0.5f, 0.0f,
                            0.5f, -0.5f, 0.0f,
                           -0.5f, -0.5f, 0.0f };

        pa.setCoordinates(0, coords);
        Appearance app = new Appearance();
        PointAttributes pointAttrs = new PointAttributes();
        pointAttrs.setPointSize(3.0f);
        ColoringAttributes colorAttrs = new ColoringAttributes();
        colorAttrs.setColor(1.0f, 0.0f, 1.0f);
        app.setPointAttributes(pointAttrs);
        app.setColoringAttributes(colorAttrs);
        Shape3D s3d = new Shape3D(pa, app);

        objTrans.addChild(s3d);

        // 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,
                                        4000, 0, 0,
                                        0, 0, 0);

        RotationInterpolator rotator =
            new RotationInterpolator(rotationAlpha, objTrans, 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);
        objTrans.addChild(rotator);

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

        return objRoot;
    }

    public HelloUniverse() {
        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();
        SimpleUniverse 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);
    }

    //
    // The following allows HelloUniverse to be run as an application
    // as well as an applet
    //
    public static void main(String[] args) {
        new MainFrame(new HelloUniverse(), 256, 256);
    }
}