Chris Cai's Tech Blog

摘要： This small operation calcuates the distance between two points. The routine can work in any number of dimensions, so you cold apply it to 2D or 3D. In 2D Define your two points. Point 1 at (x1, y1) a... 阅读全文

摘要： Separating axis theorem:http://en.wikipedia.org/wiki/Separating_axis_theoremPolygon Collision: http://gpwiki.org/index.php/Polygon_Collision 阅读全文

摘要： Dot Prodcut The dot product (inner product) of two vectors is a measure of how similar the two vectors are (how much one is projected onto the other), multiplied by the magnitudes. Two vectors that ar... 阅读全文

摘要： The concept of personalizing for customers is certainly not new. But the Web elevates it to a near art form. The Web is the perfect marketing environment for precision marketing, because individuals c... 阅读全文