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C# XNA4 2D Collision Detection

I am working on a 2D engine in Xna and am running in a bit of trouble with Collision implementation. What I want to do is have an interface ICollidable that I can add to GameObjects that are ...
5
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3answers
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Designing for multiple screen resolutions and aspect ratios, target one resolution then scale to meet others or use normalized values?

I feel like what I'm currently doing is stupid but would just like reaffirmation it is. Basically I'm writing games which target a certain screen resolution (800x480), so all positions, widths and ...