Color schemes generation - theory and algorithms [closed]

Question

I will be generating charts and diagrams and I am looking for some theory on color schemes and algorithm examples.

Example questions:

• How to generate complementary or analogous colors?
• How to generate pastel, cold and warm colors?
• How to generate any number of random but distinct colors?
• How to translate all that to the hex triplet (web color)?

My implementation will be in AS3 but any examples in pseudocode are welcome.