相关疑难解决方法(0)

请考虑:

dalist={{21, 22}, {26, 13}, {32, 17}, {31, 11}, {30, 9}, 
        {25, 12}, {12, 16}, {18, 20}, {13, 23}, {19, 21}, 
        {14, 16}, {14, 22}, {18,22}, {10, 22}, {17, 23}}


ScreenCenter = {20, 15}

FrameXYs = {{4.32, 3.23}, {35.68, 26.75}}

Graphics[{EdgeForm[Thick], White, Rectangle @@ FrameXYs, 
          Black, Point@dalist, Red, Disk[ScreenCenter, .5]}]

我想要做的是为每个点计算它在坐标系中的角度,例如:

上面是Deisred输出,它们是给定特定"角度仓"的点的频率计数.一旦我知道如何计算角度,我应该能够做到这一点.