两条线之间的角度是错误的 | 两条线之间的角度是错误的

本文介绍了两条线之间的角度是错误的的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

I want to get angles between two line.So I used this code.

int posX = (ScreenWidth) >> 1;

int posY = (ScreenHeight) >> 1;

double radians, degrees;

radians = atan2f( y - posY , x - posX);

degrees = -CC_RADIANS_TO_DEGREES(radians);

NSLog(@"%f %f",degrees,radians);

But it doesn't work .The Log is that: 146.309935 -2.553590

What's the matter?I can't know the reason.Please help me.

解决方案

If you simply use

radians = atan2f( y - posY , x - posX);

you'll get the angle with the horizontal line y=posY (blue angle).

You'll need to add M_PI_2 to your radians value to get the correct result.

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