iphone - Filling color in closed image

Question

I'm trying to create an app for children. It will have different images. And those images will have different closed shapes like stars, balls or any other similar images. I am aware of how to draw on iphone. I know how to select a color, how to change the brush size etc.

What I want to know is to select a color and on touch of image, it has to flood fill the closed area around touched co-ordinate. Is it possible? How can I do it? (For example, if I touch inside the ball, the ball must be filled with one color)

Answer 1

I think you need to use blending for that, see this answer:

http://stackoverflow.com/questions/3921548/iphone-app-how-to-fill-an-image-with-empty-areas-with-coregraphics