Click on NSBezierPath

Question

I'm drawing a NSBezierPath line on my NSImageView. I'm creating NSBezierPath object, setting moveToPoint, setting lineToPoint, setting setLineWidth: and after that in drawRect of my NSImageView subclass I'm calling [myNSBezierPath stroke]. It all works just like I want, but I can't seem to use containsPoint: method... I tried implementing

if([myNSBezierPath containsPoint:[theEvent locationInWindow]]{
   //do something
}

in -(void)mouseUp:(NSEvent*)theEvent of my NSImageView subclass but it's never reacting and I'm sure I'm hitting that line... Am I doing something wrong? I just need to detect if NSBezierPath is being clicked.

Cheers.

Answer 1

Make sure to transform the mouse click location into the coordinate system of your image view subclass, not into the one of the window (unless they are the same). Your bezier path doesn't know about the offset it's drawn into, so you have to take that into account when performing a hit test.

Also, from the containsPoint: documentation:

This method checks the point against the path itself and the area it encloses. When determining hits in the enclosed area, this method uses the non-zero winding rule (NSNonZeroWindingRule). It does not take into account the line width used to stroke the path.

Emphasis mine.