Off Screen Test
/*
* @(#)OffScreenTest.java 1.13 02/10/21 13:46:49
*
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import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;
import java.awt.image.BufferedImage;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.ImageComponent;
import javax.media.j3d.ImageComponent2D;
import javax.media.j3d.Raster;
import javax.media.j3d.Screen3D;
import javax.media.j3d.Shape3D;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.media.j3d.View;
import javax.vecmath.Point3f;
import javax.vecmath.Vector3d;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.SimpleUniverse;
/**
* OffScreenTest issues renderOffScreenBuffer from the postSwap callback of the
* OnScreen canvas.
*/
public class OffScreenTest extends Applet {
private SimpleUniverse u = null;
public BranchGroup createSceneGraph(Raster drawRaster) {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
// spin object has composited transformation matrix
Transform3D spin = new Transform3D();
Transform3D tempspin = new Transform3D();
spin.rotX(Math.PI / 4.0d);
tempspin.rotY(Math.PI / 5.0d);
spin.mul(tempspin);
spin.setScale(0.7);
spin.setTranslation(new Vector3d(-0.4, 0.3, 0.0));
TransformGroup objTrans = new TransformGroup(spin);
objRoot.addChild(objTrans);
// Create a simple shape leaf node, add it to the scene graph.
// ColorCube is a Convenience Utility class
objTrans.addChild(new ColorCube(0.4));
//Create a raster
Shape3D shape = new Shape3D(drawRaster);
objRoot.addChild(shape);
// Let Java 3D perform optimizations on this scene graph.
objRoot.compile();
return objRoot;
}
public OffScreenTest() {
}
public void init() {
setLayout(new BorderLayout());
GraphicsConfiguration config = SimpleUniverse
.getPreferredConfiguration();
BufferedImage bImage = new BufferedImage(200, 200,
BufferedImage.TYPE_INT_ARGB);
ImageComponent2D buffer = new ImageComponent2D(
ImageComponent.FORMAT_RGBA, bImage);
buffer.setCapability(ImageComponent2D.ALLOW_IMAGE_READ);
Raster drawRaster = new Raster(new Point3f(0.0f, 0.0f, 0.0f),
Raster.RASTER_COLOR, 0, 0, 200, 200, buffer, null);
drawRaster.setCapability(Raster.ALLOW_IMAGE_WRITE);
// create the main scene graph
BranchGroup scene = createSceneGraph(drawRaster);
// create the on-screen canvas
OnScreenCanvas3D d = new OnScreenCanvas3D(config, false);
add("Center", d);
// create a simple universe
u = new SimpleUniverse(d);
// This will move the ViewPlatform back a bit so the
// objects in the scene can be viewed.
u.getViewingPlatform().setNominalViewingTransform();
// create an off Screen Canvas
OffScreenCanvas3D c = new OffScreenCanvas3D(config, true, drawRaster);
// set the offscreen to match the onscreen
Screen3D sOn = d.getScreen3D();
Screen3D sOff = c.getScreen3D();
sOff.setSize(sOn.getSize());
sOff.setPhysicalScreenWidth(sOn.getPhysicalScreenWidth());
sOff.setPhysicalScreenHeight(sOn.getPhysicalScreenHeight());
// attach the same view to the offscreen canvas
View v = u.getViewer().getView();
v.addCanvas3D(c);
// tell onscreen about the offscreen so it knows to
// render to the offscreen at postswap
d.setOffScreenCanvas(c);
u.addBranchGraph(scene);
v.stopView();
// Make sure that image are render completely
// before grab it in postSwap().
d.setImageReady();
v.startView();
}
public void destroy() {
u.cleanup();
}
public static void main(String argv[]) {
new MainFrame(new OffScreenTest(), 500, 500);
}
}
class OffScreenCanvas3D extends Canvas3D {
Raster drawRaster;
boolean printing = false;
public OffScreenCanvas3D(GraphicsConfiguration gconfig,
boolean offscreenflag, Raster drawRaster) {
super(gconfig, offscreenflag);
this.drawRaster = drawRaster;
}
public void print(boolean toWait) {
if (!toWait)
printing = true;
BufferedImage bImage = new BufferedImage(200, 200,
BufferedImage.TYPE_INT_ARGB);
ImageComponent2D buffer = new ImageComponent2D(
ImageComponent.FORMAT_RGBA, bImage);
buffer.setCapability(ImageComponent2D.ALLOW_IMAGE_READ);
this.setOffScreenBuffer(buffer);
this.renderOffScreenBuffer();
if (toWait) {
this.waitForOffScreenRendering();
drawOffScreenBuffer();
}
}
public void postSwap() {
if (printing) {
super.postSwap();
drawOffScreenBuffer();
printing = false;
}
}
void drawOffScreenBuffer() {
BufferedImage bImage = this.getOffScreenBuffer().getImage();
ImageComponent2D newImageComponent = new ImageComponent2D(
ImageComponent.FORMAT_RGBA, bImage);
drawRaster.setImage(newImageComponent);
}
}
class OnScreenCanvas3D extends Canvas3D {
OffScreenCanvas3D c;
boolean print = false;
boolean imageReady = false;
public OnScreenCanvas3D(GraphicsConfiguration gconfig, boolean offscreenflag) {
super(gconfig, offscreenflag);
}
public void setOffScreenCanvas(OffScreenCanvas3D c) {
this.c = c;
}
public void setImageReady() {
imageReady = true;
}
public void postSwap() {
if (imageReady && !print) {
c.print(false);
print = true;
}
}
}
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