图像打开，直线，角度，圆面积的测量。 代码比较容易看懂，可以在此基础上扩展-images open, linear, angle, round area measurements. Code is easier to read, on the basis of this expansion

图像打开，直线，角度，圆面积的测量。 代码比较容易看懂，可以在此基础上扩展-images open, linear, angle, round area measurements. Code is easier to read, on the basis of this expansion