Displaying PathGeometry into canvas take too long time

Question

Hi every one,
I am working on spatial data with an application WPF and I would like to draw a map from data queries.
I got my data and I am able to draw them on a canvas with scroll bar and zoom.
My problem is when I want to zoom or scroll the canvas take a long time before draw the map.
The big problem is there :
Dim poly As New Polygon
poly.Stroke = Brushes.Red
poly.Fill = Brushes.Orange
poly.StrokeThickness = 5
Dim colPoint As New PointCollection
For i = 1 To geo.STNumPoints
Dim ls As New LineSegment()
colPoint.Add(New Point(geo.STPointN(i).STX.Value - extentA, geo.STPointN(i).STY.Value - extentB))
Next
colPoint.Add(New Point(geo.STPointN(1).STX.Value - extentA, geo.STPointN(1).STY.Value - extentB))
poly.Points = colPoint
masterCanvas.Children.Add(poly)
so the canvas is "masterCanvas" and i add each Polygon one by one. I would like if it is possible to gather all polygon into one "image" and then when it will refresh the canvas it will draw only one thing. 
Regards.

Answer 1

Hi,
I found that you have posted it in the forum Acamar suggested.
http://social.msdn.microsoft.com/Forums/vstudio/en-US/e2d50b4e-0d76-4a3c-b229-521b648b54b3/displaying-pathgeometry-into-canvas-take-too-long-time?forum=wpf#e2d50b4e-0d76-4a3c-b229-521b648b54b3
Please just focus on that thread, and you could mark if any reply which is helpful as answer.
Thanks for your understanding.
Regards.
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