我有两个对象,当我移动一个我想要从另一个角度.
例如
Object1X = 211.000000,Object1Y = 429.000000 Object2X = 246.500000,Object2Y = 441.500000
我试过以下和每一个变化在阳光下
double radians = ccpAngle(Object1,Object2); double degrees = ((radians * 180) / Pi);
但是我刚刚得到了2.949023返回,我想要45度等等
请帮忙
谢谢
乔纳森
解决方法
这个其他答案有帮助吗？
How to map atan2() to degrees 0-360
我写的是这样的：
- (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;
}
运行代码：
CGPoint p1 = CGPointMake(10,10); CGPoint p2 = CGPointMake(20,20); CGFloat f = [self pointPairToBearingDegrees:p1 secondPoint:p2];
而这返回45.
希望这可以帮助.
