Hi Dave,
Here is an exmaple of how start/stopRenderer() works.
(works fine with v1.2.1 release)
It is a bug if startRendering() fail to start once stop.
In this case please send us a test case.
Thanks.
- Kelvin
---------------
Java 3D Team
Sun Microsystems Inc.
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>Date: Wed, 14 Mar 2001 19:52:17 -0500
>From: David <[EMAIL PROTECTED]>
>Subject: [JAVA3D] Stopping rendering and restarting
>To: [EMAIL PROTECTED]
>
>I am trying to figure out the best way to stop rendering, do some
>loading/etc and then restart rendering. I want to do this at startup and
>for certain situations. Specifically I want to free up the CPU cycles and
>not show partially built scenegraphs while loading. I also want to replace
>the canvas with some other components during this time (a swing 2d animation
>for example, or splash image).
>
>I tried using canvas.stopRenderer() and canvas.startRenderer() but I can't
>seem to get it started once I stop it. I looked at view.stopView() and the
>docs say this should not be used for flow control. Detaching the main
>branchgroup is not what I want to do, since that leaves the renderer running
>flat out.
>
>Suggestions?
>
>Dave Yazel
>
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/*
* @(#)StartStopRenderer.java 1.3 99/09/15 13:38:26
*
* Copyright (c) 1996-1999 Sun Microsystems, Inc. All Rights Reserved.
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* which is disparaging to Sun.
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*/
import java.awt.*;
import java.awt.event.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.*;
class StartStopRendererPanel extends Panel implements ActionListener {
private StartStopRenderer startStop;
private Button stopButton;
private Button startButton;
private Button quitButton;
public void actionPerformed (ActionEvent event) {
Object target = event.getSource();
if (target == stopButton) {
startStop.stopInterpolators();
}
else if (target == startButton) {
startStop.startInterpolators();
}
else if (target == quitButton) {
System.exit(0);
}
}
public void paint(Graphics g) {
Dimension d = getSize();
g.drawRect(0, 0, d.width - 1, d.height - 1);
}
public StartStopRendererPanel(StartStopRenderer startStop) {
this.startStop = startStop;
stopButton = new Button("Stop");
startButton = new Button("Start");
quitButton = new Button("Quit");
stopButton.addActionListener(this);
startButton.addActionListener(this);
quitButton.addActionListener(this);
setLayout(new FlowLayout());
add(stopButton);
add(startButton);
add(quitButton);
}
}
public class StartStopRenderer extends Frame {
Canvas3D canvas = null;
public BranchGroup createSceneGraph() {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
// Create a Transformgroup to scale all objects so they
// appear in the scene.
TransformGroup objScale = new TransformGroup();
Transform3D t3d = new Transform3D();
t3d.setScale(0.4);
objScale.setTransform(t3d);
objRoot.addChild(objScale);
// 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);
objScale.addChild(objTrans);
// Create a simple shape leaf node, add it to the scene graph.
objTrans.addChild(new ColorCube());
// 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);
return objRoot;
}
public void stopInterpolators() {
canvas.stopRenderer();
}
public void startInterpolators() {
canvas.startRenderer();
}
public StartStopRenderer() {
canvas = new Canvas3D(SimpleUniverse.getPreferredConfiguration());
// Handle the close event
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent winEvent) {
System.exit(0);
}
});
StartStopRendererPanel startStopPanel
= new StartStopRendererPanel(this);
startStopPanel.setSize(0, 100);
add("North", startStopPanel);
add("Center", canvas);
setTitle("Java3D: Canvas Start Stop Renderer Test");
setSize(256, 256);
setVisible(true);
// Create a simple scene and attach it to the virtual universe
BranchGroup scene = createSceneGraph();
SimpleUniverse u = new SimpleUniverse(canvas);
// This will move the ViewPlatform back a bit so the
// objects in the scene can be viewed.
u.getViewingPlatform().setNominalViewingTransform();
u.addBranchGraph(scene);
}
public static void main(String[] args) {
new StartStopRenderer();
}
}
