Circle.IntersectsWith

[gnjunge]

Hi, On my C# winforms project I have received some fairly large rounded buttons from the graphics department. Since they are large I cannot cheat and take their rectangular outline as "hotspot" area for mouse enter/leave (to change cursor to hand, and back) and click. So with other words the code Rectangle.IntersectsWith(Control.MousePosition) doesn't do it for me. I need some code that is Circle.IntersectsWith(Control.MousePosition). Did anybody encounter this problem, and has a simple solution for it? Or can give me tips how to handle this problem? Tnx.

[leppie]

Look at Region and/or GraphicsPath :) xacc.ide-0.1.1 released! :) Download and screenshots

[gnjunge]

Tnx, I created a GraphicsPath, added an ellipse. From that I created a new Region, and on mouseover I check if the mouseposition is Visible (Region.IsVisible)

[Robert Rohde]

If its a real circle than Pythagoras could help:

public bool IsWithin(Button button, int x, int y) {
//assuming x and y are relative within the button rect
//which is totally filled by the circle
int halfButtonSize = button.Width / 2;
int distFromCenterX = x - halfButtonSize;
int distFromCenterY = y - halfButtonSize;
int distFromCenterTotal = Math.Sqrt(distFromCenterX * distFromCenterX
+ distFromCenterY * distFromCenterY);
if (distFromCenterTotal <= halfButtonSize)
OnButtonClick(EventArgs.Empty);
}