Hello!
Please explain this. I am sending it for second time.
I am stuck for last three days and I have no clues
about it. See this part of the prgram, I have attached
comments in this if loop:
if (node instanceof Box && event1.getClickCount()==2 )
I am facing a very peculiar problem:
I am trying to detach a branchgroup from a
transformgroup. When I use removeChild(int) method
of TransformGroup, i can detach the Branchgroup but
when I use detach() method of BranchGroup, I can't. it
is also not throwing any exception but there is no
effect of using detach() method.
I really want to use detach() method because with
this i can identify a particular branchgroup, which is
not possible with removeChild(), as I am attaching
BranchGroups randomly every time I run the
application, so their order wil be different.
Can somebody gives me any tips. I am attaching
behavior class with this mail for quick reference.
thanks
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class slbehavior extends Behavior
{
private TransformGroup targetTG;
private BranchGroup scene;
private Canvas3D canvas;
public static int count=0;
public static Point3d cg[]=new Point3d[2];
public BranchGroup bgbox,bgcone,bgcyl,bgsph;
slbehavior (TransformGroup targetTG,Canvas3D canvas, BranchGroup scene)
{
this.targetTG=targetTG;
this.scene=scene;
this.canvas=canvas;
}
public void initialize()
{
this.wakeupOn(new WakeupOnAWTEvent(MouseEvent.MOUSE_CLICKED));
}
WakeupOnAWTEvent trigger = new WakeupOnAWTEvent(MouseEvent.MOUSE_CLICKED);
public void processStimulus (Enumeration criteria)
{
PickShape shape=null;
PickObject obj = new PickObject(canvas,scene);
if ( obj != null )
{
AWTEvent myEvent[] = trigger.getAWTEvent();
int xpos = 0;
int ypos = 0;
MouseEvent event1=null;
try
{
event1 = (MouseEvent) myEvent[0];
}
catch (ArrayIndexOutOfBoundsException a){}
if ( event1 != null )
{
xpos = event1.getX();
ypos = event1.getY();
System.out.println(xpos + " " + ypos);
}
SceneGraphPath closest = obj.pickClosest(xpos, ypos);
if ( closest != null )
{
Primitive myShape=null;
try
{
Node node = closest.getNode(1);
int nodeCount = closest.nodeCount();
System.out.println(nodeCount);
if (node instanceof Primitive)
{
myShape = (Primitive) node;
}
bgbox = new BranchGroup();
bgbox.setCapability(BranchGroup.ALLOW_DETACH);
bgbox.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
bgbox.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
bgcyl=new BranchGroup();
bgcyl.setCapability(BranchGroup.ALLOW_DETACH);
bgcyl.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
bgcyl.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
bgcone=new BranchGroup();
bgcone.setCapability(BranchGroup.ALLOW_DETACH);
bgcone.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
bgcone.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
bgsph=new BranchGroup();
bgsph.setCapability(BranchGroup.ALLOW_DETACH);
bgsph.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
bgsph.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
if (myShape!=null && event1.getClickCount()==1)
{
System.out.println(count);
cg[count++] = (Point3d)myShape.getUserData();
if (count==2 && node instanceof Sphere)
{
LineArray la=new LineArray(2,LineArray.COORDINATES);
la.setCoordinates(0,cg);
Shape3D shapesph = new Shape3D(la);
bgsph.addChild(shapesph);
System.out.println("Number of Children of TargetTG before bgsph is attached to it:" +
targetTG.numChildren());
targetTG.addChild(bgsph);
System.out.println("Number of Children of TargetTG after bgsph is attached to it:" +
targetTG.numChildren());
count=0;
}
if (count==2 && node instanceof Box )
{
LineArray la=new LineArray(2,LineArray.COORDINATES);
la.setCoordinates(0,cg);
Shape3D shapebox = new Shape3D(la);
bgbox.addChild(shapebox);
System.out.println("Number of Children of TargetTG before bgbox is attached to it:" +
targetTG.numChildren());
targetTG.addChild(bgbox);
System.out.println("Number of Children of TargetTG after bgbox is attached to it:" +
targetTG.numChildren());
count=0;
}
if (count==2 && node instanceof Cylinder )
{
LineArray la=new LineArray(2,LineArray.COORDINATES);
la.setCoordinates(0,cg);
Shape3D shapecyl = new Shape3D(la);
bgcyl.addChild(shapecyl);
System.out.println("Number of Children of TargetTG before bgcyl is attached to it:" +
targetTG.numChildren());
targetTG.addChild(bgcyl);
System.out.println("Number of Children of TargetTG after bgcyl is attached to it:" +
targetTG.numChildren());
count=0;
}
if (count==2 && node instanceof Cone)
{
LineArray la=new LineArray(2,LineArray.COORDINATES);
la.setCoordinates(0,cg);
Shape3D shapecone = new Shape3D(la);
bgcone.addChild(shapecone);
System.out.println("Number of Children of TargetTG before bgcone is attached to it:" +
targetTG.numChildren());
targetTG.addChild(bgcone);
System.out.println("Number of Children of TargetTG after bgcone is attached to it:" +
targetTG.numChildren());
count=0;
}
} // end of myshape!=null
else
{
System.out.println("No Primitive is being Picked Up");
}
if (node instanceof Box && event1.getClickCount()==2 )
{
System.out.println("Touched a Box");
System.out.println("Number of Children of TargetTG before bg is detached from it:" +
targetTG.numChildren());
//targetTG.removeChild(6); // working well, but I don't need it
bgbox.detach(); //doesn't work, no clue, I need it
System.out.println("Number of Children of TargetTG after bg is detached from it:" +
targetTG.numChildren());
}
if (node instanceof Cylinder && event1.getClickCount()==2 )
{
System.out.println("Touched a Cylinder");
System.out.println("Number of Children of TargetTG before bg is detached from it:" +
targetTG.numChildren());
bgcyl.detach();
System.out.println("Number of Children of TargetTG after bg is detached from it:" +
targetTG.numChildren());
}
if (node instanceof Cone && event1.getClickCount()==2 )
{
System.out.println("Touched a Cone");
//Box box=(Box)node;
//Point3d x = (Point3d)box.getUserData();
System.out.println("Number of Children of TargetTG before bg is detached from it:" +
targetTG.numChildren());
bgcone.detach();
System.out.println("Number of Children of TargetTG after bg is detached from it:" +
targetTG.numChildren());
}
if (node instanceof Sphere && event1.getClickCount()==2 )
{
System.out.println("Touched a Sphere");
System.out.println("Number of Children of TargetTG before bg is detached from it:" +
targetTG.numChildren());
bgsph.detach();
System.out.println("Number of Children of TargetTG after bg is detached from it:" +
targetTG.numChildren());
}
}//end of try
catch (ArrayIndexOutOfBoundsException a)
{
System.out.println("Exception Loop...");
}
}// end of closest!=null
else
{
System.out.println("scenegraph path is null...");
}
}//end of obj!=null
this.wakeupOn(trigger);
}
}
