本文介绍了从 2 个位置获取角度的处理方法，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 have 2 objects and when I move one, I want to get the angle from the other.
For example:
Object1X = 211.000000, Object1Y = 429.000000
Object2X = 246.500000, Object2Y = 441.500000
I have tried the following and every variation under the sun:
double radians = ccpAngle(Object1,Object2);
double degrees = ((radians * 180) / Pi);
But I just get 2.949023 returned where I want something like 45 degrees etc.
解决方案
Does this other answer help?
How to map atan2() to degrees 0-360
I've written it like this:
- (CGFloat) pointPairToBearingDegrees:(CGPoint)startingPoint secondPoint:(CGPoint) endingPoint
{
CGPoint originPoint = CGPointMake(endingPoint.x - startingPoint.x, endingPoint.y - startingPoint.y); // get origin point to origin by subtracting end from start
float bearingRadians = atan2f(originPoint.y, originPoint.x); // get bearing in radians
float bearingDegrees = bearingRadians * (180.0 / M_PI); // convert to degrees
bearingDegrees = (bearingDegrees > 0.0 ? bearingDegrees : (360.0 + bearingDegrees)); // correct discontinuity
return bearingDegrees;
}
Running the code:
CGPoint p1 = CGPointMake(10, 10);
CGPoint p2 = CGPointMake(20,20);
CGFloat f = [self pointPairToBearingDegrees:p1 secondPoint:p2];
And this returns 45.
Hope this helps.
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