Hello Dean,
Thursday, 27 January 00, you wrote:
DK> Hi,
DK> I want to be able to orbit my view around the center of object in 3D space.
Currently I am rotating my view which causes my object to disappear from view and so I
have to pan over to where the object is. I want to be able to orbit my view around an
DK> object so that the object never leaves my view. I do not want to rotate the
object, I want it to stay in its true position when it was read in. Can anyone tell
me how to do this and what math is involved? Can I establish an anchor or pivot point
DK> for my view to rotate around? Please help if you can, I'm trying to resolve this
ASAP.
DK> Thanks,
DK> Dean
try this one...should work.
but well, its early in the morning...don't
bother me with the mathematical stuff :o)
//***************************************************************************
/**
Responsible for the ability to rotate the camera 360 degrees vertical
and horizontal around a point (0,1,0)
@param vertical
@param horizontal
@param radius
*/
//***************************************************************************
public void changeView(double vertical, double horizontal, double radius){
double angleH = horizontal / 180.0 * Math.PI;
double angleV = vertical / 180.0 * Math.PI;
eyeX = radius * Math.sin(angleH);
eyeZ = radius * Math.cos(angleH);
eyeY = radius * Math.cos(angleV);
eyeX = eyeX * Math.sin(angleV);
eyeZ = eyeZ * Math.sin(angleV);
Point3d eyeLocation = new Point3d(eyeX, eyeY, eyeZ);
Point3d lookingAt = new Point3d(eyeX / 2, eyeY / 2, eyeZ / 2);
Vector3d up = new Vector3d(0.0d, (vertical > 180 ? -1.0d : 1.0d), 0.0d);
viewpoint.lookAt(eyeLocation, lookingAt, up);
viewpoint.invert();
vpTrans.setTransform(viewpoint);
}
public void mouseDragged(MouseEvent e) {
int newX = e.getX();
int newY = e.getY() - 90;
posX -= (newX - startX) / 2;
posX = posX % 360;
if (posX < 1) posX = 360 - posX;
posY -= (newY - startY) / 2;
posY = posY % 360;
if (posY < 1) posY = 360 - posY;
changeView(posY,posX,distance);
startX = newX;
startY = newY;
}
public void mousePressed(MouseEvent e) {
startX = e.getX();
startY = e.getY();
}
Best regards,
Uwe mailto:[EMAIL PROTECTED]
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