n是旋转的角度.将原坐标系旋转角度n后,形成新的坐标系.X'和Y'为新坐标系下点的坐标.而x和y为该点在原来坐标系下的坐标.
直角坐标系的旋转公式X'=x*cos(n)+y*sin(n)Y'=-x*sin(n)+y*cos(n)X' ,Y' ,X
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