Hi Allistair,
I'm not a Java3D engineer, but this is how I would do this,
* The behaviour should wake up on the following AWT events:
MouseEvent.MOUSE_PRESSED, KeyEvent.KEY_PRESSED, KeyEvent.KEY_RELEASED
* In the processStimulus method:
~ On receiving a KEY_PRESSED record the key code of the
KeyEvent in some variable (say keyCode).
~ On receiving a KEY_RELEASED make the keyCode = -1, to signify
that nothing is pressed.
~ On receiving a MOUSE_PRESSED do something depending on keyCode.
I've attached some source code.
Regards,
Renoir
"Crossley, Allistair" wrote:
> Will you all join me in asking a Java3D engineer(s) to demonstrate with code
> how to write a picking behaviour that only wakes up on left click whist a
> character key "A-Z" is depressed.
>
> All the examples with Java3D are with Alt or Control but these are useless
> for big applications except for zoom and translate. Besides, there are
> special functions in the events classes that can detect these being down at
> the time of the click too which makes these easier.
>
> Anyone in favour of a concrete example from the makers of J3D say "Aye".
>
> Cheers,
>
> Allistair Crossley
> Web/New Media Consultant
> Logica UK Ltd
> Tel: 02074 463267
> Mob: 07884 056274
>
> -----Original Message-----
> From: Karsten Fries [mailto:[EMAIL PROTECTED]]
> Sent: 22 May 2001 09:24
> To: [EMAIL PROTECTED]
> Subject: [JAVA3D] Mouse events
>
> Hi there,
>
> another mouse question.
> I have the problem that I use left mouse click for selecting objects and
> left mouse double-click for zooming
> in. In big complex scenes the picking stuff is very computation
> intensive and therefore takes a while (in the range of a second is
> the max we can tolerate), but anyway the double click is not produced if
> it takes too long.
>
> Rephrased: if i double-click on a complex object (say build of 30000
> triangles) I get two mouse click events with
> clickCount() == 1 instead of one with cC==1 and a secong with cC == 2.
>
> Pitty!!
>
> Is there any way of getting around this. I already rearranged the mouse
> controls, but I'm always running in some
> problems concering this issue.
>
> Any help is appreciated!!
>
> Thanks and cheers,
> Karsten
>
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--
Renoir Sewjee
Software Engineer
ISS International (Welkom)
Tel: +27 (0)57 912 2702
Fax: +27 (0)57 912 2652
--
/**
* Picks a point in the virtual world.
*
*/
import java.awt.AWTEvent;
import java.awt.event.ActionEvent;
import java.awt.event.MouseEvent;
import java.awt.event.KeyEvent;
import java.util.Enumeration;
import java.util.ArrayList;
import com.sun.j3d.utils.picking.PickCanvas;
import com.sun.j3d.utils.picking.PickResult;
import com.sun.j3d.utils.picking.PickIntersection;
import javax.media.j3d.Behavior;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.WakeupOnAWTEvent;
import javax.media.j3d.WakeupCriterion;
import javax.media.j3d.WakeupCondition;
import javax.media.j3d.WakeupOr;
import javax.media.j3d.Canvas3D;
import javax.vecmath.Point3d;
import javax.vecmath.Point3f;
import java.util.ArrayList;
import java.util.Iterator;
import com.sun.j3d.utils.picking.PickTool;
public class Picker extends Behavior
{
private PickCanvas pickCanvas;
private WakeupCondition wakeupCondition;
private int currentKeyPressed = -1;
public Picker(Canvas3D canvas, BranchGroup scene)
{
pickCanvas = new PickCanvas(canvas, scene);
pickCanvas.setTolerance(3.0f);
pickCanvas.setMode(PickCanvas.GEOMETRY_INTERSECT_INFO);
}
public void initialize()
{
WakeupCriterion[] wakeups = new WakeupCriterion[3];
wakeups[0] = new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED);
wakeups[1] = new WakeupOnAWTEvent(KeyEvent.KEY_RELEASED);
wakeups[2] = new WakeupOnAWTEvent(MouseEvent.MOUSE_PRESSED);
wakeupCondition = new WakeupOr(wakeups);
wakeupOn(wakeupCondition);
}
public void processStimulus(Enumeration criteria)
{
while (criteria.hasMoreElements())
{
WakeupCriterion wakeup = (WakeupCriterion)criteria.nextElement();
if (wakeup instanceof WakeupOnAWTEvent)
{
AWTEvent[] events = ((WakeupOnAWTEvent)wakeup).getAWTEvent();
if (events.length > 0)
{
if (events[events.length-1] instanceof KeyEvent)
{
KeyEvent event =
(KeyEvent)events[events.length-1];
int id = event.getID();
if (id == KeyEvent.KEY_PRESSED)
{
currentKeyPressed = event.getKeyCode();
}
else
{
currentKeyPressed = -1;
}
}
else if (events[events.length-1] instanceof MouseEvent
&& currentKeyPressed != -1)
{
MouseEvent event =
(MouseEvent)events[events.length-1];
int id = event.getID();
int mod = event.getModifiers();
if (mod == MouseEvent.BUTTON1_MASK)
{
if (id == MouseEvent.MOUSE_PRESSED)
{
pickCanvas.setShapeLocation(event.getX(), event.getY());
Point3d eyePos =
pickCanvas.getStartPosition();
PickResult pickResult =
pickCanvas.pickClosest();
if (pickResult != null)
{
PickIntersection
pickIntersection =
pickResult.getClosestIntersection(eyePos);
Point3d pickedPoint =
pickIntersection.getPointCoordinatesVW();
if (currentKeyPressed
== KeyEvent.VK_A)
System.err.println("Pressed A");
else if
(currentKeyPressed == KeyEvent.VK_B)
System.err.println("Pressed B");
else
System.err.println("Pressed Something Else");
System.err.println(pickedPoint);
System.err.println();
}
else
{
System.err.println("No
point picked");
System.err.println();
}
}
}
}
}
}
}
wakeupOn(wakeupCondition);
}
}
