title: What is a good source for geometric algorithms?
body: <p>I am looking for any good sources for geometric algorithms specifically; </p>
  
  <p>The simple stuff like when two lines cross and so on is easy enough (and easy to find), but I would like to find somewhere with algorithms for the more tricky things, such as finding the shape formed by expanding a given polygon by some amount; fast algorithms for shapes with curved sides, etc.</p>
  
  <p>Any good tips? Thanks!</p>