根据三个点计算夹角

最新推荐文章于 2022-12-14 17:06:58 发布

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#夹角

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#import <CoreLocation/CoreLocation.h>

//角度换弧度

#define DEGREES_TO_RADIANS(angle) ((angle) / 180.0 * M_PI)

//弧度换角度

#define RADIANS_TO_DEGREES(radians) ((radians) * (180.0 / M_PI))

CLLocationCoordinate2D startPt = (CLLocationCoordinate2D){4, 0};    //纬度，经度
CLLocationCoordinate2D endPt = (CLLocationCoordinate2D){4, 4};    
CLLocationCoordinate2D yuanPt = (CLLocationCoordinate2D){0, 0};
double scor =  [self getSlopWithFromCoord:startPt toCoord:endPt withPoint:yuanPt];
printf("弧度：%f ，角度:%f",scor,RADIANS_TO_DEGREES(scor));

如下图：


- (double)getSlopWithFromCoord:(CLLocationCoordinate2D)fromCoord toCoord:(CLLocationCoordinate2D)toCoord withPoint:(CLLocationCoordinate2D)yuandian{

    //不是坐标点的话 fromCoord.x /fromCoord.y替换就行 原理一样

    CGFloat x1 = fromCoord.latitude - yuandian.latitude;

    CGFloat y1 = fromCoord.longitude - yuandian.longitude;

    CGFloat x2 = toCoord.latitude - yuandian.latitude;

    CGFloat y2 =toCoord.longitude - yuandian.longitude;    

    CGFloat x = x1 * x2 + y1 * y2;

    CGFloat y = x1 * y2 - x2 * y1;

    CGFloat angle = acos(x/sqrt(x*x+y*y));

    return angle;

}