patches and overlapping alpha values

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Matthew 2012-6-1

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https://ww2.mathworks.cn/matlabcentral/answers/40086-patches-and-overlapping-alpha-values

Hello,

I wrote code that creates two patch objects which overlap each other. Basically, two circles, one (circle A) at the center of the other (circle B). Both have a face value of .35. Circle A is red and circle B is blue. However, when I set’ facealpha’ property while using the patch command, the colors add up, meaning that circle B is the alpha blue that I want, but circle A is an alpha purple (the alpha red and alpha blue added together). Is there a way to get circle A looking red again? My original plan is to "cut out" circle A then patch circle B, followed by patching circle A.

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Ryan 2012-6-5

The blue element is being placed on top of the other two elements. if you view just the blue circle and the non-transparent white circle, you'll note it still has a blue hue. I am unsure of how to order patches or if it is even possible.

Matthew 2012-6-6

I ended up find a color that would simulate the light blue and red I was looking for, then plotted grid lines using Xtick and Ytick to get the effect I was looking for. Thanks to everyone for their advice and help.

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