/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

http://www.cocos2d-x.org

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
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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.

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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
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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****************************************************************************/

#include "CCPointExtension.h"
#include "ccMacros.h" // FLT_EPSILON
#include <stdio.h>
namespace   cocos2d {

#define kCCPointEpsilon FLT_EPSILON

CGFloat
ccpLength(const CCPoint v)
{
	return sqrtf(ccpLengthSQ(v));
}

CGFloat
ccpDistance(const CCPoint v1, const CCPoint v2)
{
	return ccpLength(ccpSub(v1, v2));
}

CCPoint
ccpNormalize(const CCPoint v)
{
	return ccpMult(v, 1.0f/ccpLength(v));
}

CCPoint
ccpForAngle(const CGFloat a)
{
	return ccp(cosf(a), sinf(a));
}

CGFloat
ccpToAngle(const CCPoint v)
{
	return atan2f(v.y, v.x);
}

CCPoint ccpLerp(CCPoint a, CCPoint b, float alpha)
{
	return ccpAdd(ccpMult(a, 1.f - alpha), ccpMult(b, alpha));
}

float clampf(float value, float min_inclusive, float max_inclusive)
{
	if (min_inclusive > max_inclusive) {
		float ftmp;
		ftmp = min_inclusive;
		min_inclusive = max_inclusive;
		max_inclusive = min_inclusive;
	}
	return value < min_inclusive ? min_inclusive : value < max_inclusive? value : max_inclusive;
}

CCPoint ccpClamp(CCPoint p, CCPoint min_inclusive, CCPoint max_inclusive)
{
	return ccp(clampf(p.x,min_inclusive.x,max_inclusive.x), clampf(p.y, min_inclusive.y, max_inclusive.y));
}

CCPoint ccpFromSize(CCSize s)
{
	return ccp(s.width, s.height);
}

CCPoint ccpCompOp(CCPoint p, float (*opFunc)(float)){
	return ccp(opFunc(p.x), opFunc(p.y));
}

bool ccpFuzzyEqual(CCPoint a, CCPoint b, float var)
{
	if(a.x - var <= b.x && b.x <= a.x + var)
		if(a.y - var <= b.y && b.y <= a.y + var)
			return true;
	return false;
}

CCPoint ccpCompMult(CCPoint a, CCPoint b)
{
	return ccp(a.x * b.x, a.y * b.y);
}

float ccpAngleSigned(CCPoint a, CCPoint b)
{
	CCPoint a2 = ccpNormalize(a);	CCPoint b2 = ccpNormalize(b);
	float angle = atan2f(a2.x * b2.y - a2.y * b2.x, ccpDot(a2, b2));
	if( fabs(angle) < kCCPointEpsilon ) return 0.f;
	return angle;
}

CCPoint ccpRotateByAngle(CCPoint v, CCPoint pivot, float angle) {
	CCPoint r = ccpSub(v, pivot);
	float t = r.x;
	float cosa = cosf(angle), sina = sinf(angle);
	r.x = t*cosa - r.y*sina;
	r.y = t*sina + r.y*cosa;
	r = ccpAdd(r, pivot);
	return r;
}

bool ccpLineIntersect(CCPoint p1, CCPoint p2, 
					  CCPoint p3, CCPoint p4,
					  float *s, float *t){
	CCPoint p13, p43, p21;
	float d1343, d4321, d1321, d4343, d2121;
	float numer, denom;
	
	p13 = ccpSub(p1, p3);
	
	p43 = ccpSub(p4, p3);
	
	//Roughly equal to zero but with an epsilon deviation for float 
	//correction
	if (ccpFuzzyEqual(p43, CCPointZero, kCCPointEpsilon))
		return false;
	
	p21 = ccpSub(p2, p1);
	
	//Roughly equal to zero
	if (ccpFuzzyEqual(p21,CCPointZero, kCCPointEpsilon))
		return false;
	
	d1343 = ccpDot(p13, p43);
	d4321 = ccpDot(p43, p21);
	d1321 = ccpDot(p13, p21);
	d4343 = ccpDot(p43, p43);
	d2121 = ccpDot(p21, p21);
	
	denom = d2121 * d4343 - d4321 * d4321;
	if (fabs(denom) < kCCPointEpsilon)
		return false;
	numer = d1343 * d4321 - d1321 * d4343;
	
	*s = numer / denom;
	*t = (d1343 + d4321 *(*s)) / d4343;
	
	return true;
}

float ccpAngle(CCPoint a, CCPoint b)
{
	float angle = acosf(ccpDot(ccpNormalize(a), ccpNormalize(b)));
	if( fabs(angle) < kCCPointEpsilon ) return 0.f;
	return angle;
}
}//namespace   cocos2d