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XNA icon cooldown clock effect

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In blizzard games, when a spell or item is on cooldown there is a clock effect over the icon. What would be the best way to do this in XNA? I tried using solutions from other posts but they didn't touch directly on XNA, and I couldn't figure out how to implement the solutions.

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In XNA you can use SpriteBatch with an AlphaTestEffect. Set the Alpha value to set the threshold above which something is drawn.

If you have a "disc" image with the alpha varying at different angles around the disc, then you could use this to display different "angle ranges" of the disc, so to speak.

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Take 5 vertices and make a square clock. Place vertices at 12, 3, 6 and 9 o'clock and one in the center.

The top and center vertex never moves.

The 3, 6 and 9 o'clock vertices you move in a circle using sin(tx+b) and cos(tx+b), where t is time, x is the scale and b is the phase/offset. Edited by Tispe

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That's not the alpha mask technique though, I want to do what phil said and use an alpha channel texture... but I don't how to use AlphaTestEffect properly with the spritebatch in XNA

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Set up an instance of AlphaTestEffect with the parameters set properly, and then pass it to SpriteBatch.Draw in one of the overloaded functions.

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