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From: d Milthon on 7 Jun 2010 10:10
I have a polygon inside a polygon (polygon with a 'hole') and
I'm trying to use the patch command (in my GUI) to color only the big polygon without the inner hole so i need to color the bigger one (doesn't matter what color) and the smaller polygon needs to be white (or background color) so it would look like a hole inside a polygon.

i tried:
p=patch(x,y,z,'w');
clear z
z = [3 37];
set(p,'FaceColor','flat','CData',z,'CDataMapping','scaled')

but i can only give strange colors to the faces, not white as i need.

Does anyone know a fast way with patch ?
From: Walter Roberson on 7 Jun 2010 11:02
d Milthon wrote:
> I have a polygon inside a polygon (polygon with a 'hole') and
> I'm trying to use the patch command (in my GUI) to color only the big
> polygon without the inner hole so i need to color the bigger one
> (doesn't matter what color) and the smaller polygon needs to be white
> (or background color) so it would look like a hole inside a polygon.
>
> i tried:
> p=patch(x,y,z,'w');
> clear z
> z = [3 37];
> set(p,'FaceColor','flat','CData',z,'CDataMapping','scaled')
>
> but i can only give strange colors to the faces, not white as i need.
>
> Does anyone know a fast way with patch ?

I suggest you see
http://www.mathworks.com/access/helpdesk/help/techdoc/ref/patch.html#br92bi7-17

and look at the examples for "Specifying Face Colors Using x-, y-, and
z-Coordinate Input"
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