图形学中元的生成画法：中点画圆算法.中点画圆算法理解与实现；显示圆弧上的八个对称点的算法: void CirclePoints(int x,int y,int color) { drawpixel(x,y,color); drawpixel(y,x,color); drawpixel(-x,y,color); drawpixel(y,-x,color); drawpixel(x,-y,color); drawpixel(-y,x,color); drawpixel(-x,-y,color);