How to draw shape element faster and make them scale in wpf?
I have this problem.
So I have a bunch of data that must be visualized on a canvas (say more than 5000 items). So I draw them as a bunch of vertical rectangles over a horizontal line, some thing like this:
Now, because the canvas is small, I only draw a different amount of rectangles at different zoom level. So if I zoom in more, the line get longer, and more rectangles I can see.
Problem is every time I zoom in, I have to clear the whole canvas, and redaw everything with the new zoom scale. And it is really suck, the drawing is slow and scaling not really nice.
So I wondering is there a way I can achieve a faster drawing, and good zooming (like those vector graph, you can zoom in unlimited)??
Have you tried ScaleTransform Class?
<Canvas.RenderTransform> <ScaleTransform ScaleX="2" ScaleY="2" /> </Canvas.RenderTransform>
See How to: Scale an Element too. For performance reasons:
Freeze your Freezables.
Update Rather than Replace a RenderTransform
You may be able to update a Transform rather than replacing it as the value of a RenderTransform property. This is particularly true in scenarios that involve animation. By updating an existing Transform, you avoid initiating an unnecessary layout calculation.
Have you looked at the ZoomableCanvas? I haven't used it, but it looks like it's designed to do exactly what you want.