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ZoomCanvas FlyTo

May 14, 2011 at 4:36 PM

Hi there,

I find the ZoomCanvas really helpful for my project - great work!

However, I am a bit puzzled by the FlyTo method: In what coordinate system does it expect the rect parameter to be?

I tried screen coordinates, but it did not produce the desired effect:
For example, specifying (0, 0, 640, 480) I would expect the resulting area to include the upper left area of what was displayed on the screen before. The scale is set correctly, but the position is not.

I played around with the ScreenToWorld and WorldToScreen method, without being too successful, though.

Many thanks,

May 15, 2011 at 2:24 PM

After experimenting and looking at the source code, I found the following to work - although it does not seem the most straight-forward approach:


// position and size of element to fly to and show fullscreen
double top, left, width, right;

double scale = 
  Math.Max(MyZoomCanvas.RenderSize.Width / width,  MyZoomCanvas.RenderSize.Height / height);

Point canvasCenter = 
  new Point(MyZoomCanvas.RenderSize.Width / 2, MyZoomCanvas.RenderSize.Height / 2);

Point center = new Point(
  canvasCenter.X + (canvasCenter.X - left - width / 2) * scale,
  canvasCenter.Y + (canvasCenter.Y - top - height / 2) * scale);

center = new Point(-center.X, -center.Y);
center = new Point(center.X - width / 2, center.Y - height / 2);

Vector size = new Vector(width, height);
MyZoomCanvas.FlyTo(rect, 0, TimeSpan.FromMilliseconds(500));