Introduction - If you have any usage issues, please Google them yourself
//The following is a drawcircle procedures,// drawing line, circle, drawing a variety of curve is actually very simple, in the final analysis is the x, y of the dual equation嘛//of the proposed algorithm interested to find this computer graphics, look, rather than hedge Oh. It is not clear a few words, huh, huh//----------------------------------------------// byte void circleDot (unsigned char x, unsigned char y, char xx, char yy)// internal function, Symmetry drawcircle mirror points of the 8 (//Symmetry drawcircle the 8 image points