找到角度0-360 [英] finding angles 0-360
问题描述
需要数学问题的帮助：
i需要使用x和y来获得0度的真实角度。目前使用此方法来计算
im：
Need help with a math issue: i need to get the true angle from 0 degrees using x and y cordinates im using this at the moment:
Math.atan((x2-x1)/(y1-y2))/(Math.PI/180)
但 /（Math.PI / 180）将结果限制在-90到90
i需要0-360
but /(Math.PI/180) limits results from -90 to 90
i need 0-360
注意：我正在使用角度来指示方向：
note: I'm using the angle to indicate direction:
- 0 = up
- 90 =正确
- 135 = 45度右+下
- 180 =下来
- 270 =左
- 等
- 0=up
- 90=right
- 135=45 degree right+down
- 180=down
- 270=left
- etc
推荐答案
Math.atan将您限制在单位圆上最右边的两个象限。要获得完整的0-360度：
Math.atan limits you to the two rightmost quadrants on the unit circle. To get the full 0-360 degrees:
if x < 0 add 180 to the angle
else if y < 0 add 360 to the angle.
与我的相比，您的坐标系被旋转和反转（并与常规相比）。正x是向右，正y是向上。右边0度（x> 0，y = 0，向上90度（x = 0，y> 0）向上135度，向左（y> 0，x = -y）等。你的x轴和y轴指向？
Your coordinate system is rotated and inverted compared to mine (and compared to convention). Positive x is to the right, positive y is up. 0 degrees is to the right (x>0, y=0, 90 degrees is up (x=0,y>0) 135 degrees is up and to the left (y>0, x=-y), etc. Where are your x- and y-axes pointing?
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