import java.util.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.awt.*;
import java.awt.event.*;
import com.sun.j3d.utils.geometry.*;
import com.sun.j3d.utils.picking.*;
import com.sun.j3d.utils.picking.behaviors.*;
Can someone please help with this? I have a translate behavior that
successfully moves a shape through a scene while the user drags the
mouse with the right mouse button, it works fine until you try and do it
a second time, at which point the shape returns to its original position
and translates from there. I am calling setTransform where I think I
should be, I'm totally stuck, would really appreciate any help.
Here is some sample output from the program:
mouse pressed : MODEL TRANS: 1.0, 0.0, 0.0, 2.5
0.0, 1.0, 0.0, 0.0
0.0, 0.0, 1.0, 2.5
0.0, 0.0, 0.0, 1.0
mouse dragged : MODEL TRANS: 1.0, 0.0, 0.0, 2.5
0.0, 1.0, 0.0, 0.0
0.0, 0.0, 1.0, 2.5
0.0, 0.0, 0.0, 1.0
CALLING UPDATE SCENE
CURRENT SHAPE TRANSFORM: 1.0, 0.0, 0.0, 2.5
0.0, 1.0, 0.0, 0.0
0.0, 0.0, 1.0, 2.5
0.0, 0.0, 0.0, 1.0
CURRENT SHAPE TRANSFORM: 1.0, 0.0, 0.0, 2.508
0.0, 1.0, 0.0, 0.0
0.0, 0.0, 1.0, 2.5
0.0, 0.0, 0.0, 1.0
CURRENT SHAPE TRANSFORM: 1.0, 0.0, 0.0, 2.516
0.0, 1.0, 0.0, 0.0
0.0, 0.0, 1.0, 2.5
0.0, 0.0, 0.0, 1.0
CURRENT SHAPE TRANSFORM: 1.0, 0.0, 0.0, 2.524
0.0, 1.0, 0.0, 0.0
0.0, 0.0, 1.0, 2.5
0.0, 0.0, 0.0, 1.0
mouse dragged : MODEL TRANS: 1.0, 0.0, 0.0, 2.532
0.0, 1.0, 0.0, 0.0
0.0, 0.0, 1.0, 2.5
0.0, 0.0, 0.0, 1.0
CALLING UPDATE SCENE
CURRENT SHAPE TRANSFORM: 1.0, 0.0, 0.0, 2.532
0.0, 1.0, 0.0, 0.0
0.0, 0.0, 1.0, 2.5
0.0, 0.0, 0.0, 1.0
Etc etc etc :)
Then, the second time you try and do it:
mouse pressed : MODEL TRANS: 1.0, 0.0, 0.0, 2.5
0.0, 1.0, 0.0, 0.0
0.0, 0.0, 1.0, 2.5
0.0, 0.0, 0.0, 1.0
mouse dragged : MODEL TRANS: 1.0, 0.0, 0.0, 2.5
0.0, 1.0, 0.0, 0.0
0.0, 0.0, 1.0, 2.5
0.0, 0.0, 0.0, 1.0
CALLING UPDATE SCENE
CURRENT SHAPE TRANSFORM: 1.0, 0.0, 0.0, 2.5
0.0, 1.0, 0.0, 0.0
0.0, 0.0, 1.0, 2.5
0.0, 0.0, 0.0, 1.0
CURRENT SHAPE TRANSFORM: 1.0, 0.0, 0.0, 2.508
0.0, 1.0, 0.0, 0.0
0.0, 0.0, 1.0, 2.5
0.0, 0.0, 0.0, 1.0
It starts again from the shapes original starting position.
I would really appreciate some help, thanks in advance, Ben
public class MyPickTranslateBehavior
extends PickTranslateBehavior
implements Constants {
protected WakeupCondition m_WakeupCondition = null;
private int x = 0;
private int y = 0;
private int x_last = 0;
private int y_last = 0;
private double y_angle = 0.0;
private double x_factor = 0.02;
int changeX;
int changeY;
Appearance appear;
ColoringAttributes ca;
private Transform3D modelTrans = null;
private Transform3D transformY = null;
private PickResult pickResult = null;
private Node pickNode = null;
private TransformGroup transformGroup = null;
Canvas3D canvas;
BranchGroup objRoot;
Java3DFrame frame;
BranchGroup guideShape;
double step = 0.008;
public MyPickTranslateBehavior(Java3DFrame f, BranchGroup objRoot,
Canvas3D canvas,
BoundingSphere bounds) {
super(objRoot, canvas, bounds);
this.frame = f;
this.setBounds(bounds);
this.canvas = canvas;
this.objRoot = objRoot;
modelTrans = new Transform3D();
transformY = new Transform3D();
transformGroup = new TransformGroup();
transformGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
transformGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
transformGroup.setCapability(TransformGroup.ALLOW_CHILDREN_WRITE);
//create the wakeupCriterion for the behavior
WakeupCriterion criterionArray[] = new WakeupCriterion[2];
criterionArray[0] = new WakeupOnAWTEvent(MouseEvent.MOUSE_PRESSED);
criterionArray[1] = new WakeupOnAWTEvent(MouseEvent.MOUSE_DRAGGED);
//save the WakeupCriterion for the behavior
m_WakeupCondition = new WakeupOr(criterionArray);
}
public void initialize() { // initialize
wakeupOn(m_WakeupCondition); //Apply the initial WakeupCriterion
}
public void processStimulus(Enumeration criteria) { // processStimulus
while (criteria.hasMoreElements()) {
WakeupCriterion wakeUp = (WakeupCriterion) criteria.nextElement();
if (wakeUp instanceof WakeupOnAWTEvent) {
AWTEvent[] evt = ( (WakeupOnAWTEvent) wakeUp).getAWTEvent();
try {
processAWTEvent(evt);
}
catch (Exception e) {
}
}
}
//Assign the next WakeupCondition, so we are notified again
wakeupOn(m_WakeupCondition);
}
private void processAWTEvent(AWTEvent[] events) {
for (int n = 0; n < events.length; n++) {
if (events[n] instanceof MouseEvent) {
MouseEvent eventPress = (MouseEvent) events[n];
if (eventPress.getModifiers() == MouseEvent.BUTTON3_MASK) {
//System.out.println("RIGHT MOUSE PRESSED _ DOING
TRANSLATION");
if (eventPress.getID() == MouseEvent.MOUSE_PRESSED) {
pickCanvas.setShapeLocation(eventPress);
pickResult = pickCanvas.pickClosest();
if (pickResult != null) {
pickNode = pickResult.getObject();
transformGroup = (TransformGroup) pickResult.getNode(
PickResult.
TRANSFORM_GROUP);
transformGroup.getTransform(modelTrans);
System.out.println("mouse pressed : MODEL TRANS: " +
modelTrans.toString());
x = x_last = eventPress.getX();
y = y_last = eventPress.getY();
}
}
if ( (eventPress.getID() == MouseEvent.MOUSE_DRAGGED)) {
System.out.println("mouse dragged : MODEL TRANS: " +
modelTrans.toString());
transformGroup.setTransform(modelTrans);
//transformGroup.getTransform(modelTrans);
//System.out.println("mouse dragged 2 : MODEL TRANS: " +
modelTrans.toString());
// Translating the object on both the X and Y axis
x = eventPress.getX();
y = eventPress.getY();
changeX = x - x_last;
changeY = y - y_last;
updateScene();
x_last = x;
y_last = y;
}
}
}
}
}
public void updateScene() {
System.out.println("CALLING UPDATE SCENE");
int loopCount = changeX;
if (changeX < 0) {
loopCount = changeX * -1; //make pos
}
loopCount = loopCount * 4;
boolean rightCollision = false;
boolean leftCollision = false;
int stepCountRight = 0;
int stepCountLeft = 0;
for (int i = 0; i < loopCount; i++) {
//transformGroup.getTransform(modelTrans);
System.out.println("CURRENT SHAPE TRANSFORM: " +
modelTrans.toString());
Vector3d temp = new Vector3d();
modelTrans.get(temp);
Vector3d temp2 = new Vector3d();
if (frame.inCollision() && (leftCollision == false) &&
(rightCollision == false)) {
if (changeX < 0) {
temp2 = new Vector3d(step, 0.0, 0.0);
leftCollision = true;
}
else {
temp2 = new Vector3d( -step, 0.0, 0.0);
rightCollision = true;
}
}
else {
if (changeX > 0) {
if ( (rightCollision == true) && (stepCountRight == 0)) {
temp2 = new Vector3d( -step, 0.0, 0.0);
stepCountRight--;
}
else {
temp2 = new Vector3d(step, 0.0, 0.0);
}
if (rightCollision && (stepCountRight != 0)) {
stepCountRight++;
}
}
else {
if ( (leftCollision == true) && (stepCountLeft == 0)) {
temp2 = new Vector3d(step, 0.0, 0.0);
stepCountLeft--;
}
else {
temp2 = new Vector3d( -step, 0.0, 0.0);
}
if (leftCollision && (stepCountLeft != 0)) {
stepCountLeft++;
}
}
}
Transform3D t2 = new Transform3D();
t2.setTranslation(temp2);
modelTrans.mul(modelTrans, t2);
transformGroup.setTransform(modelTrans);
}
}
}
********************************************
Ben Logan - Graduate Software Engineer
RCID
Stephenson Building
Newcastle Upon Tyne
NE1 7RU
www.rcid.ncl.ac.uk
********************************************
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