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BindingTestPanel.java
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2000-09-01
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/**
Company: Eyematic Interfaces
Project: Shout3D 2.0 Sample Code
Class: BindingTestPanel
Date: April 26, 1999
Description: Class for panel that shows a test for binding viewpoints & backgrounds
(C) Copyright Eyematic Interfaces, Inc. - 1997-2000 - All rights reserved
*/
package applets;
import java.applet.*;
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import java.util.Date;
import java.net.URL;
import shout3d.*;
import shout3d.core.*;
/**
* Panel that tests the changing of viewpoint and background bindings.
*
* Press the 'v' key to cycle through three viewpoints.
* The change is made just by setting the isBound field of
* the viewpoints and letting the library's mechanism respond
*
* Press the 'b' key to change between 4 backgrounds, also through
* the binding mechanism
*
* @author Paul Isaacs
* @author Jim Stewartson
* @author Dave Westwood
*/
public class BindingTestPanel extends Shout3DPanel implements DeviceObserver {
// The viewpoint and background nodes that will be bound
Viewpoint vp0, vp1, vp2;
Background bk0, bk1, bk2, bk3;
//{{ Shout3DApplet methods
/**
* Constructor
*/
public BindingTestPanel(Shout3DApplet applet){
super(applet);
}
/**
*
* This method is automatically called by the parent class Shout3DPanel
* at the correct time during initialize().
*
* Subclasses should implement this to perform any custom initialization tasks.
*/
public void customInitialize() {
// Register to observe the keyboard
addDeviceObserver(this,"KeyboardInput", null);
// Create 3 viewpoints and bind to the first
createViewpointNodes();
vp0.isBound.setValue(true);
// Create 4 backgrounds and bind to the first
createBackgroundNodes();
bk0.isBound.setValue(true);
}
/**
* Finalize
*/
protected void finalize() throws Throwable {
// Clean up by unregistering observers
removeDeviceObserver(this,"KeyboardInput");
super.finalize();
}
//}} Shout3DApplet methods
//{{ DeviceObserver methods
/**
*
* When keyboard input is received:
*
* If 'v' or 'V' cycles through viewpoints
* If 'b' or 'B' cycles through backgrounds
*/
public boolean onDeviceInput(DeviceInput di, Object userData) {
if (!(di instanceof KeyboardInput))
return false;
KeyboardInput ki = (KeyboardInput) di;
if (ki.which == KeyboardInput.PRESS) {
if (ki.key == 'v' || ki.key == 'V') {
// V key pressed. Cycle to next viewpoint.
Viewpoint curVP = (Viewpoint)getCurrentBindableNode("Viewpoint");
if (curVP == vp0)
vp1.isBound.setValue(true);
else if (curVP == vp1)
vp2.isBound.setValue(true);
else if (curVP == vp2)
vp0.isBound.setValue(true);
return true;
}
if (ki.key == 'b' || ki.key == 'B') {
// B key pressed. Toggle between backgrounds
Background curBG = (Background) getCurrentBindableNode("Background");
if (curBG == bk0)
bk1.isBound.setValue(true);
else if (curBG == bk1)
bk2.isBound.setValue(true);
else if (curBG == bk2)
bk3.isBound.setValue(true);
else
bk0.isBound.setValue(true);
return true;
}
}
return false;
}
//}} DeviceObserver methods
// Field values for the viewpoints
float[] pos0 = { 0, 10, -75 };
float[] pos1 = { 40, 10, -40 };
float[] pos2 = { 0, 50, -10 };
float[] rot0 = { 0, 1, 0, 3.14159f };
float[] rot1 = { 0, 1, 0, 2.36f };
float[] rot2 = { 1, 0, 0, -1.57079f };
void createViewpointNodes() {
// Create three viewpoints, add to the scene,
// and give them different POVs.
vp0 = new Viewpoint(this);
vp1 = new Viewpoint(this);
vp2 = new Viewpoint(this);
vp0.isBound.setValue(false);
vp1.isBound.setValue(false);
vp2.isBound.setValue(false);
Node[] newKids = new Node[3];
newKids[0] = vp0;
newKids[1] = vp1;
newKids[2] = vp2;
if ((getScene() != null) && (getScene() instanceof Group)) {
((Group)getScene()).addChildren(newKids);
}
else {
throw new Shout3DException("BindingTestPanel got null scene");
}
// Set positions and orientations
vp0.position.setValue(pos0);
vp1.position.setValue(pos1);
vp2.position.setValue(pos2);
vp0.orientation.setValue(rot0);
vp1.orientation.setValue(rot1);
vp2.orientation.setValue(rot2);
}
void createBackgroundNodes(){
// bk0 is the starting background, bk1 is one we make right here
bk0 = (Background) getCurrentBindableNode("Background");
ImageTexture bkTexture = new ImageTexture(applet);
String[] urlVals1 = {"images/shared/sky_starry_bg.gif" };
bkTexture.url.setValue(urlVals1 );
bk1 = new Background(this);
bk1.texture.setValue(bkTexture);
ImageTexture bkTexture2 = new ImageTexture(applet);
String[] urlVals2 = {"images/shared/partly_transparent_bg.gif"};
bkTexture2.url.setValue(urlVals2);
bk2 = new Background(this);
bk2.texture.setValue(bkTexture2);
bk3 = new Background(this);
bk3.texture.setValue(bkTexture2);
bk3.stretchToFit.setValue(true);
}
}