Re: Path gradient/shading

Hello,

I am trying to implement a complicated gradient/shading filling using

Quartz.

I need something like path gradient in GDI+ on Windows. The examples of path

gradient are:

<http://msdn.microsoft.com/library/en-us/gdicpp/GDIPlus/graphics/pathgradien

t4.png>

<http://www.functionx.com/vcsharp/gdi/images/path1.gif>

I would like to divide the shape into triangles with one corner in the

center point of the shape and other 2 corners in the shape path. In the

first example it would be 3 triangles inside the big triangle, in the 2nd

example it would be 4 triangles inside the rectangle.

Each triangle would use the regular linear shading created with

CGShadingCreateAxial().

But the problem is when you draw 2 shaded triangles side by side, they do

not "stick" together nicely. There is an antialiased edge between them. So

the end effect is that you see the lines where those triangles are

connected. I tried to turn off antialiasing by calling

CGContextSetShouldAntialias(context, false) and the effect is that the edges

of neighbor triangles overlap. It looks OK with opaque colors but

unfortunately it shows edge when you use transparency (the same happens if I

try to expand the triangle size by 1 pixel so  the edges overlap).

Any advice how to glue shaded shapes together in a way that the edges don't

show?

Thanks,

Tom

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