Greg Huang wrote:
>Thank for your response.
>I found the problem is if there are more than one Canvas3D in on Virtual
>Universe, the Mouse behavior cannot work. The solution is a subclass of
>Behavior must implement MouseListener or MouseMotionListener and then Canvas
>also add this listener.
>My conclusion is multiple canvases can accept mouse events if the behavior
>implements mouse - listeners and deals with WakeupOnBehaviorPost instead of
>WakeupOnAWTEvent.
>I don't sure it is right , but it is my observation at least.
>
>Thanks again!
>Greg
>
>
That's incorrect.
Attach is an example the construct 3 Canvas3D, all use the
same universe. The second canvas is offscreen so it will not display.
When the mouse drag on it, you will see both 1st and 3rd cube move in the
canvas.
- Kelvin
---------
Java 3D Team
Sun Microsystems Inc.
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import java.applet.Applet;
import java.awt.FlowLayout;
import java.awt.GraphicsEnvironment;
import java.awt.GraphicsConfiguration;
import java.awt.event.*;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import com.sun.j3d.utils.geometry.ColorCube;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.behaviors.mouse.*;
public class MultiCanvases extends Applet {
public BranchGroup createSceneGraph() {
// Create the root of the subgraph
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);
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
objRoot.addChild(objTrans);
// Create a simple shape leaf node and add it into the scene graph.
objTrans.addChild(new ColorCube(0.4));
// 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 rotation = new Alpha(-1, Alpha.INCREASING_ENABLE,
0, 0,
4000, 0, 0,
0, 0, 0);
BoundingSphere bounds =
new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
// Create the rotate behavior node
MouseRotate behavior = new MouseRotate();
behavior.setTransformGroup(objTrans);
objTrans.addChild(behavior);
behavior.setSchedulingBounds(bounds);
// Create the zoom behavior node
MouseZoom behavior2 = new MouseZoom();
behavior2.setTransformGroup(objTrans);
objTrans.addChild(behavior2);
behavior2.setSchedulingBounds(bounds);
// Create the translate behavior node
MouseTranslate behavior3 = new MouseTranslate();
behavior3.setTransformGroup(objTrans);
objTrans.addChild(behavior3);
behavior3.setSchedulingBounds(bounds);
/*
RotationInterpolator rotator =
new RotationInterpolator(rotation,
objTrans, yAxis,
0.0f, (float) Math.PI*2.0f);
rotator.setSchedulingBounds(bounds);
objTrans.addChild(rotator);
*/
// Have Java 3D perform optimizations on this scene graph.
objRoot.compile();
return objRoot;
}
public MultiCanvases(int numCanvases) {
setLayout(new FlowLayout());
GraphicsConfigTemplate3D template = new GraphicsConfigTemplate3D();
GraphicsConfiguration gConfig =
GraphicsEnvironment.getLocalGraphicsEnvironment().
getDefaultScreenDevice().getBestConfiguration(template);
Canvas3D c = new Canvas3D(gConfig);
c.setSize(200, 200);
add(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();
View view = u.getViewer().getView();
for (int i = 1; i < numCanvases; i++) {
// Create a new canvas and add it to the view
if (i == 1) {
c = new Canvas3D(SimpleUniverse.getPreferredConfiguration(), true);
} else {
c = new Canvas3D(SimpleUniverse.getPreferredConfiguration(), false);
}
c.setSize(200, 200);
add(c);
view.addCanvas3D(c);
}
u.addBranchGraph(scene);
}
void removeFirstCanvas() {
}
//
// The following allows MultiCanvases to be run as an application
// as well as an applet
//
public static void main(String[] args) {
int nCanvases = 3;
if (args.length > 0) {
try {
nCanvases = Integer.parseInt(args[0]);
}
catch (NumberFormatException e) {
System.out.println("Usage: java MultiCanvases [#canvases]");
System.exit(1);
}
}
MultiCanvases mc = new MultiCanvases(nCanvases);
new MainFrame(mc, 700, 700);
try {
Thread.sleep(5000);
} catch (Exception e){};
mc.removeFirstCanvas();
}
}
