Retired Document
Important: This sample code may not represent best practices for current development. The project may use deprecated symbols and illustrate technologies and techniques that are no longer recommended.
MathUtils.h
/* |
File: MathUtils.h |
Abstract: Math utilities |
Version: 1.0 |
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*/ |
#import <Foundation/Foundation.h> |
#define ToRad(deg) ( (M_PI * (deg)) / 180.0 ) |
#define ToDeg(rad) ( (180.0 * (rad)) / M_PI ) |
#define SQR(x) ( (x) * (x) ) |
// Given the vector v from p1 to p2, computes the angle in degrees between v and the compared vector <0,1> (<0,-1> if flipped). |
// The returned angle is in the range [0,360). |
// |
static inline float AngleFromNorth(NSPoint p1, NSPoint p2, BOOL flipped) { |
NSPoint v = NSMakePoint(p2.x-p1.x,p2.y-p1.y); |
float vmag = sqrt(SQR(v.x) + SQR(v.y)), result = 0; |
v.x /= vmag; |
v.y /= vmag; |
result = ToDeg(atan2(v.x,(flipped ? -v.y : v.y))); |
return (result >=0 ? result : result + 360.0); |
} |
Copyright © 2009 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2009-05-26