// helper function transforming parameters from screen to world coordinates
void dolly(Teigha.GraphicsSystem.View pView, int x, int y)
{
Vector3d vec = new Vector3d(-x, -y, 0.0);
vec = vec.TransformBy((pView.ScreenMatrix * pView.ProjectionMatrix).Inverse());
pView.Dolly(vec);
}
// helper function transforming parameters from screen to world coordinates
public static void Transform(this Teigha.GraphicsSystem.View pView, double x, double y)
{
Vector3d vec = new Vector3d(-x, -y, 0.0);
vec = vec.TransformBy((pView.ScreenMatrix * pView.ProjectionMatrix).Inverse());
pView.Dolly(vec);
}
private void ZoomWindow(Point3d pt1, Point3d pt2)
{
using (Teigha.GraphicsSystem.View pView = helperDevice.ActiveView)
{
using (AbstractViewPE pVpPE = new AbstractViewPE(pView))
{
pt1 = pt1.TransformBy(pVpPE.WorldToEye);
pt2 = pt2.TransformBy(pVpPE.WorldToEye);
Vector3d eyeVec = pt2 - pt1;
if (((eyeVec.X < -1E-10) || (eyeVec.X > 1E-10)) && ((eyeVec.Y < -1E-10) || (eyeVec.Y > 1E-10)))
{
Point3d newPos = pt1 + eyeVec / 2.0;
pView.Dolly(newPos.GetAsVector());
double wf = pView.FieldWidth / Math.Abs(eyeVec.X);
double hf = pView.FieldHeight / Math.Abs(eyeVec.Y);
pView.Zoom(wf < hf ? wf : hf);
Invalidate();
}
}
}
}