/Users/ricardoquesada/progs/cocos2d-iphone/cocos2d/Support/CGPointExtension.h

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/* cocos2d for iPhone
 * http://www.cocos2d-iphone.org
 *
 * Copyright (c) 2007 Scott Lembcke
 * Copyright (c) 2010 Lam Pham
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/*
 * Some of the functions were based on Chipmunk's cpVect.h.
 */

#import <CoreGraphics/CGGeometry.h>
#import <math.h>
#import <objc/objc.h>

#ifdef __cplusplus
extern "C" {
#endif  

#define ccp(__X__,__Y__) CGPointMake(__X__,__Y__)


static inline CGPoint
ccpNeg(const CGPoint v)
{
        return ccp(-v.x, -v.y);
}

static inline CGPoint
ccpAdd(const CGPoint v1, const CGPoint v2)
{
        return ccp(v1.x + v2.x, v1.y + v2.y);
}

static inline CGPoint
ccpSub(const CGPoint v1, const CGPoint v2)
{
        return ccp(v1.x - v2.x, v1.y - v2.y);
}

static inline CGPoint
ccpMult(const CGPoint v, const CGFloat s)
{
        return ccp(v.x*s, v.y*s);
}

static inline CGPoint
ccpMidpoint(const CGPoint v1, const CGPoint v2)
{
        return ccpMult(ccpAdd(v1, v2), 0.5f);
}

static inline CGFloat
ccpDot(const CGPoint v1, const CGPoint v2)
{
        return v1.x*v2.x + v1.y*v2.y;
}

static inline CGFloat
ccpCross(const CGPoint v1, const CGPoint v2)
{
        return v1.x*v2.y - v1.y*v2.x;
}

static inline CGPoint
ccpPerp(const CGPoint v)
{
        return ccp(-v.y, v.x);
}

static inline CGPoint
ccpRPerp(const CGPoint v)
{
        return ccp(v.y, -v.x);
}

static inline CGPoint
ccpProject(const CGPoint v1, const CGPoint v2)
{
        return ccpMult(v2, ccpDot(v1, v2)/ccpDot(v2, v2));
}

static inline CGPoint
ccpRotate(const CGPoint v1, const CGPoint v2)
{
        return ccp(v1.x*v2.x - v1.y*v2.y, v1.x*v2.y + v1.y*v2.x);
}

static inline CGPoint
ccpUnrotate(const CGPoint v1, const CGPoint v2)
{
        return ccp(v1.x*v2.x + v1.y*v2.y, v1.y*v2.x - v1.x*v2.y);
}

static inline CGFloat
ccpLengthSQ(const CGPoint v)
{
        return ccpDot(v, v);
}

CGFloat ccpLength(const CGPoint v);

CGFloat ccpDistance(const CGPoint v1, const CGPoint v2);

CGPoint ccpNormalize(const CGPoint v);

CGPoint ccpForAngle(const CGFloat a);

CGFloat ccpToAngle(const CGPoint v);


float clampf(float value, float min_inclusive, float max_inclusive);

CGPoint ccpClamp(CGPoint p, CGPoint from, CGPoint to);

CGPoint ccpFromSize(CGSize s);

CGPoint ccpCompOp(CGPoint p, float (*opFunc)(float));

CGPoint ccpLerp(CGPoint a, CGPoint b, float alpha);


BOOL ccpFuzzyEqual(CGPoint a, CGPoint b, float variance);


CGPoint ccpCompMult(CGPoint a, CGPoint b);

float ccpAngleSigned(CGPoint a, CGPoint b);

float ccpAngle(CGPoint a, CGPoint b);

CGPoint ccpRotateByAngle(CGPoint v, CGPoint pivot, float angle);

BOOL ccpLineIntersect(CGPoint p1, CGPoint p2, 
                                          CGPoint p3, CGPoint p4,
                                          float *s, float *t);

#ifdef __cplusplus
}
#endif