Picking for Web-Based 3D Experiment - Interactive Web-Based Virtual Reality with Java 3D - page 425

// Mouse drag event //

if ((eventId == MouseEvent.MOUSE_DRAGGED) &&

!((MouseEvent)event[i]).isAltDown() &&

!((MouseEvent)event[i]).isMetaDown())

{

float delta;

int x_d = ((MouseEvent)event[i]).getX();

int y_d = ((MouseEvent)event[i]).getY();

pickCanvas.setShapeLocation(x_d, y_d);

Point3d eyePos = pickCanvas.getStartPosition ();

pickResult = pickCanvas.pickClosest();

if (pickResult != null)

{

// Get closest intersection results

PickIntersection pi = pickResult.getClosestIntersection(eyePos);

Point3d []pt = pi.getPrimitiveCoordinates();

if (pt.length==3)

{

if (pt[0].z>KNOBFACE&&pt[1].z>KNOBFACE&&pt[2].z>KNOBFACE)

{

Point3d intPt = pi.getPointCoordinatesVW();

CurrentPt = new Point3f(intPt);

setPosition(sphTrans, CurrentPt);

}

else

{

setPosition(sphTrans, sphposi);

MouseRelease(obj);

trans = null;

obj = 0;

}
}
else
{
if (pt[0].z>BUTTONFACE&&pt[1].z>BUTTONFACE&&pt[2].z>BUTTONFACE&&pt[3].z>BUTTONFACE)

{

Point3d intPt = pi.getPointCoordinatesVW();

CurrentPt = new Point3f(intPt);

setPosition(sphTrans, CurrentPt);

}

else

{

setPosition(sphTrans, sphposi);

MouseRelease(obj);

trans = null;

obj = 0;

}

}

}

else