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I have a led panel which looks like this. This is built with a canvas object that contains a grid with columns and rows. Each field of that matrix contains a LED control which contains an ellipse.
Now I want to draw a line on the canvas. I think I am able to do that but how can I get all LED controls which are on that line?
Provided that you draw a System.Windows.Shapes.Line, you could get the Geometry of the Line by the RenderedGeometry property and use that Geometry as input for a geometry hit-test.
Such a hit-test would be done by a call to VisualTreeHelper.HitTest with a GeometryHitTestParameters argument. HitTest would call your HitTestResultCallback for every ellipse that is covered by the line’s geometry.
I am not completely sure whether geometry hit-testing would work with “empty” geometries like a line with zero width. But you could give it a try and in case it doesn’t work use for example a tilted rectangle geometry instead of the line. Or you could simulate the use of a Pen with a certain thickness by creating a “widened” geometry with Geometry.GetWidenedPathGeometry.