public void Form1_MouseWheel(object sender, MouseEventArgs e)
{
if (!IsMouseEventNeeded(e.X, e.Y))
{
return;
}
if (helperDevice == null)
{
return;
}
using (Teigha.GraphicsSystem.View pView = helperDevice.ActiveView)
{
// camera position in world coordinates
Point3d pos = pView.Position;
// TransformBy() returns a transformed copy
pos = pos.TransformBy(pView.WorldToDeviceMatrix);
int vx = (int)pos.X;
int vy = (int)pos.Y;
vx = e.X - vx;
vy = e.Y - vy;
// we move point of view to the mouse location, to create an illusion of scrolling in/out there
dolly(pView, -vx, -vy);
// note that we essentially ignore delta value (sign is enough for illustrative purposes)
pView.Zoom(e.Delta > 0 ? 1.0 / 0.9 : 0.9);
dolly(pView, vx, vy);
//
Invalidate();
}
}
public static void ZoomMap(Teigha.GraphicsSystem.View pView, Point2d centerPoint, double zoomFactor)
{
// camera position in world coordinates
Point3d pos = pView.Position;
// TransformBy() returns a transformed copy
pos = pos.TransformBy(pView.WorldToDeviceMatrix);
double vx = (int)pos.X;
double vy = (int)pos.Y;
vx = centerPoint.X - vx;
vy = centerPoint.Y - vy;
// we move point of view to the mouse location, to create an illusion of scrolling in/out there
Transform(pView, -vx, -vy);
// note that we essentially ignore delta value (sign is enough for illustrative purposes)
pView.Zoom(zoomFactor);
Transform(pView, vx, vy);
}
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();
}
}
}
}
