Ah, a little tease; I've known cats like that!
Pull up a cushion on a nice day, sit down (makes you look smaller and less likely to make a sudden move), chill out, and let the cat come to you in it's own time. You have to make them think that they're the one doing the choosing! [What was I thinking? A human bending the will of cat? Stupidest thing I've said all day. ] And like, naturalplastic said, watch your body-language and don't hold direct eye-contact - just be as unthreatening as possible, basically.
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When you are fighting an invisible monster, first throw a bucket of paint over it.