[Mono-list] System.Drawing.Drawing2D.GraphicsPath

Cedric Marcone marcone@mdeo.fr
Mon, 19 Jul 2004 14:34:21 +0200


Thank you for your answer.

But as you pointed out, I was looking for a more mathematical/integrated
option.
System.Drawing as the ability to apply boolean ops on GraphicsPath. As
my problem is to find the intersection between two paths, I thought the
API could expose the underlying mechanism... but maybe it's not the
case...

I could do it by myself, relying on System.Drawing for drawing ops and
on my own geometrical implementation for hit testing and intersection
detection... but that's a pita as it means recoding b-spline, line and
ellipses... 

cheers,
--
C├ędric

On Mon, 2004-07-19 at 02:59 -0700, Jon Watte wrote:
> > - Should I render in an offline buffer using a special 
> > compositing mode and lookup afterward ?
> 
> The good-old hit-test function used since the '80s is to 
> allocate a 1-pixel bitmap to render into, and make sure 
> that that pixel is the point you're interested in 
> intersecting with (using 2D offset/changing the origin). 
> Clear it to white, render your thing in black, and then 
> see if the pixel changed color.
> 
> If you want a mathematical intersection, this won't 
> help, of course.