/** Translate specified camera view */
public void translateView(vtkCamera c, vtkRenderer r, double dx, double dy) {
// translation mode
double FPoint[];
double PPoint[];
double APoint[] = new double[3];
double RPoint[];
double focalDepth;
lock();
try {
// get the current focal point and position
FPoint = c.GetFocalPoint();
PPoint = c.GetPosition();
// calculate the focal depth since we'll be using it a lot
r.SetWorldPoint(FPoint[0], FPoint[1], FPoint[2], 1.0);
r.WorldToDisplay();
focalDepth = r.GetDisplayPoint()[2];
final int[] size = rw.GetSize();
APoint[0] = (size[0] / 2.0) + dx;
APoint[1] = (size[1] / 2.0) + dy;
APoint[2] = focalDepth;
r.SetDisplayPoint(APoint);
r.DisplayToWorld();
RPoint = r.GetWorldPoint();
if (RPoint[3] != 0.0) {
RPoint[0] = RPoint[0] / RPoint[3];
RPoint[1] = RPoint[1] / RPoint[3];
RPoint[2] = RPoint[2] / RPoint[3];
}
/*
* Compute a translation vector, moving everything 1/2 the distance
* to the cursor. (Arbitrary scale factor)
*/
c.SetFocalPoint(
(FPoint[0] - RPoint[0]) / 2.0 + FPoint[0],
(FPoint[1] - RPoint[1]) / 2.0 + FPoint[1],
(FPoint[2] - RPoint[2]) / 2.0 + FPoint[2]);
c.SetPosition(
(FPoint[0] - RPoint[0]) / 2.0 + PPoint[0],
(FPoint[1] - RPoint[1]) / 2.0 + PPoint[1],
(FPoint[2] - RPoint[2]) / 2.0 + PPoint[2]);
r.ResetCameraClippingRange();
} finally {
unlock();
}
}
/** Set the specified light at the same position than the specified camera */
public static void setLightToCameraPosition(vtkLight l, vtkCamera c) {
l.SetPosition(c.GetPosition());
l.SetFocalPoint(c.GetFocalPoint());
}