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在编程语言(Python,C#等)中,我需要确定如何计算直线和水平轴之间的角度？

我认为图像描述的最符合我的要求:

给定(P1 _x,P1 _y)和(P2 _x,P2 _y)计算此角度的最佳方法是什么？原点在于topleft,只使用正象限.

I have two Lines: L1 and L2. I want to calculate the angle between the two lines. L1 has points: {(x1, y1), (x2, y2)} and L2 has points: {(x3, y3), (x4, y4)}.

How can I calculate the angle formed between these two lines, without having to calculate the slopes? The problem I am currently having is that sometimes I have horizontal lines (lines along the x-axis) and the following formula fails (divide by zero exception):

arctan((m1 - m2) / …