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cocos2d 自带算法
/** @def CCRANDOM_MINUS1_1
returns a random float between -1 and 1
返回一个随机漂浮在-1和1之间的随机数 */
#define CCRANDOM_MINUS1_1() ((2.0f*((float)rand()/RAND_MAX))-1.0f)
/** @def CCRANDOM_0_1
returns a random float between 0 and 1
返回一个随机漂浮在0和1之间的随机数
*/
#define CCRANDOM_0_1() ((float)rand()/RAND_MAX)
/** @def CC_DEGREES_TO_RADIANS
converts degrees to radians
将度转换为弧度
*/
#define CC_DEGREES_TO_RADIANS(__ANGLE__) ((__ANGLE__) * 0.01745329252f) // PI / 180
/** @def CC_RADIANS_TO_DEGREES
converts radians to degrees
将弧度转换成度
*/
#define CC_RADIANS_TO_DEGREES(__ANGLE__) ((__ANGLE__) * 57.29577951f) // PI * 180
*************************************************************************************
/** Helper macro that creates a Vec2
@return Vec2
@since v0.7.2
*/
CC_DEPRECATED_ATTRIBUTE inline Vec2 ccp(float x, float y)
{
return Vec2(x, y);
}
/** Returns opposite of point.
@return Vec2
@since v0.7.2
@deprecated please use Vec2::-, for example: -v1
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2
ccpNeg(const Vec2& v)
{
return -v;
}
/** Calculates sum of two points.
@return Vec2
@since v0.7.2
@deprecated please use Vec2::+, for example: v1 + v2
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2
ccpAdd(const Vec2& v1, const Vec2& v2)
{
return v1 + v2;
}
/** Calculates difference of two points.
@return Vec2
@since v0.7.2
@deprecated please use Vec2::-, for example: v1 - v2
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2
ccpSub(const Vec2& v1, const Vec2& v2)
{
return v1 - v2;
}
/** Returns point multiplied by given factor.
@return Vec2
@since v0.7.2
@deprecated please use Vec2::*, for example: v1 * v2
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2
ccpMult(const Vec2& v, const float s)
{
return v * s;
}
/** Calculates midpoint between two points.
@return Vec2
@since v0.7.2
@deprecated please use it like (v1 + v2) / 2.0f
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2
ccpMidpoint(const Vec2& v1, const Vec2& v2)
{
return v1.getMidpoint(v2);
}
/** Calculates dot product of two points.
@return float
@since v0.7.2
*/
CC_DEPRECATED_ATTRIBUTE static inline float
ccpDot(const Vec2& v1, const Vec2& v2)
{
return v1.dot(v2);
}
/** Calculates cross product of two points.
@return float
@since v0.7.2
*/
CC_DEPRECATED_ATTRIBUTE static inline float
ccpCross(const Vec2& v1, const Vec2& v2)
{
return v1.cross(v2);
}
/** Calculates perpendicular of v, rotated 90 degrees counter-clockwise -- cross(v, perp(v)) >= 0
@return Vec2
@since v0.7.2
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2
ccpPerp(const Vec2& v)
{
return v.getPerp();
}
/** Calculates perpendicular of v, rotated 90 degrees clockwise -- cross(v, rperp(v)) <= 0
@return Vec2
@since v0.7.2
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2
ccpRPerp(const Vec2& v)
{
return v.getRPerp();
}
/** Calculates the projection of v1 over v2.
@return Vec2
@since v0.7.2
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2
ccpProject(const Vec2& v1, const Vec2& v2)
{
return v1.project(v2);
}
/** Rotates two points.
@return Vec2
@since v0.7.2
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2
ccpRotate(const Vec2& v1, const Vec2& v2)
{
return v1.rotate(v2);
}
/** Unrotates two points.
@return Vec2
@since v0.7.2
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2
ccpUnrotate(const Vec2& v1, const Vec2& v2)
{
return v1.unrotate(v2);
}
/** Calculates the square length of a Vec2 (not calling sqrt() )
@return float
@since v0.7.2
*/
CC_DEPRECATED_ATTRIBUTE static inline float
ccpLengthSQ(const Vec2& v)
{
return v.getLengthSq();
}
/** Calculates the square distance between two points (not calling sqrt() )
@return float
@since v1.1
*/
CC_DEPRECATED_ATTRIBUTE static inline float
ccpDistanceSQ(const Vec2 p1, const Vec2 p2)
{
return (p1 - p2).getLengthSq();
}
/** Calculates distance between point an origin
@return float
@since v0.7.2
*/
CC_DEPRECATED_ATTRIBUTE static inline float ccpLength(const Vec2& v)
{
return v.getLength();
}
/** Calculates the distance between two points
@return float
@since v0.7.2
*/
CC_DEPRECATED_ATTRIBUTE static inline float ccpDistance(const Vec2& v1, const Vec2& v2)
{
return v1.getDistance(v2);
}
/** Returns point multiplied to a length of 1.
@return Vec2
@since v0.7.2
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2 ccpNormalize(const Vec2& v)
{
return v.getNormalized();
}
/** Converts radians to a normalized vector.
将弧度转换为归一化向量。
@return Vec2
@since v0.7.2
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2 ccpForAngle(const float a)
{
return Vec2::forAngle(a);
}
/** Converts a vector to radians.
向量转换为弧度。
@return float
@since v0.7.2
*/
CC_DEPRECATED_ATTRIBUTE static inline float ccpToAngle(const Vec2& v)
{
return v.getAngle();
}
/** Clamp a point between from and to.
@since v0.99.1
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2 ccpClamp(const Vec2& p, const Vec2& from, const Vec2& to)
{
return p.getClampPoint(from, to);
}
/** Quickly convert Size to a Vec2
@since v0.99.1
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2 ccpFromSize(const Size& s)
{
return Vec2(s);
}
/** Run a math operation function on each point component
* absf, fllorf, ceilf, roundf
* any function that has the signature: float func(float);
* For example: let‘s try to take the floor of x,y
* ccpCompOp(p,floorf);
@since v0.99.1
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2 ccpCompOp(const Vec2& p, float (*opFunc)(float))
{
return p.compOp(opFunc);
}
/** Linear Interpolation between two points a and b
@returns
alpha == 0 ? a
alpha == 1 ? b
otherwise a value between a..b
@since v0.99.1
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2 ccpLerp(const Vec2& a, const Vec2& b, float alpha)
{
return a.lerp(b, alpha);
}
/** @returns if points have fuzzy equality which means equal with some degree of variance.
@since v0.99.1
*/
CC_DEPRECATED_ATTRIBUTE static inline bool ccpFuzzyEqual(const Vec2& a, const Vec2& b, float variance)
{
return a.fuzzyEquals(b, variance);
}
/** Multiplies a and b components, a.x*b.x, a.y*b.y
@returns a component-wise multiplication
@since v0.99.1
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2 ccpCompMult(const Vec2& a, const Vec2& b)
{
return Vec2(a.x * b.x, a.y * b.y);
}
/** @returns the signed angle in radians between two vector directions
@since v0.99.1
*/
CC_DEPRECATED_ATTRIBUTE static inline float ccpAngleSigned(const Vec2& a, const Vec2& b)
{
return a.getAngle(b);
}
/** @returns the angle in radians between two vector directions
@since v0.99.1
*/
CC_DEPRECATED_ATTRIBUTE static inline float ccpAngle(const Vec2& a, const Vec2& b)
{
return a.getAngle(b);
}
/** Rotates a point counter clockwise by the angle around a pivot
@param v is the point to rotate
@param pivot is the pivot, naturally
@param angle is the angle of rotation cw in radians
@returns the rotated point
@since v0.99.1
*/
CC_DEPRECATED_ATTRIBUTE static inline Vec2 ccpRotateByAngle(const Vec2& v, const Vec2& pivot, float angle)
{
return v.rotateByAngle(pivot, angle);
}
/** A general line-line intersection test
@param p1
is the startpoint for the first line P1 = (p1 - p2)
@param p2
is the endpoint for the first line P1 = (p1 - p2)
@param p3
is the startpoint for the second line P2 = (p3 - p4)
@param p4
is the endpoint for the second line P2 = (p3 - p4)
@param s
is the range for a hitpoint in P1 (pa = p1 + s*(p2 - p1))
@param t
is the range for a hitpoint in P3 (pa = p2 + t*(p4 - p3))
@return bool
indicating successful intersection of a line
note that to truly test intersection for segments we have to make
sure that s & t lie within [0..1] and for rays, make sure s & t > 0
the hit point is p3 + t * (p4 - p3);
the hit point also is p1 + s * (p2 - p1);
@since v0.99.1
*/
CC_DEPRECATED_ATTRIBUTE static inline bool ccpLineIntersect(const Vec2& p1, const Vec2& p2,
const Vec2& p3, const Vec2& p4,
float *s, float *t)
{
return Vec2::isLineIntersect(p1, p2, p3, p4, s, t);
}
/*
ccpSegmentIntersect returns true if Segment A-B intersects with segment C-D
@since v1.0.0
*/
CC_DEPRECATED_ATTRIBUTE
static inline bool ccpSegmentIntersect(const Vec2& A, const
Vec2& B, const Vec2& C, const Vec2& D)
{
return Vec2::isSegmentIntersect(A, B, C, D);
}
/*
ccpIntersectPoint returns the intersection point of line A-B, C-D
@since v1.0.0
*/
CC_DEPRECATED_ATTRIBUTE
static inline Vec2 ccpIntersectPoint(const Vec2& A, const Vec2&
B, const Vec2& C, const Vec2& D)
{
return Vec2::getIntersectPoint(A, B, C, D);
}
CC_DEPRECATED_ATTRIBUTE inline Vec2 CCPointMake(float x, float y)
{
return Vec2(x, y);
}
CC_DEPRECATED_ATTRIBUTE inline Size CCSizeMake(float width, float height)
{
return Size(width, height);
}
CC_DEPRECATED_ATTRIBUTE inline Rect CCRectMake(float x, float y, float width, float height)
{
return Rect(x, y, width, height);
}本文出自 “风中的一粒沙” 博客，请务必保留此出处http://libinqi456.blog.51cto.com/4819343/1603788
cocos2d 自带算法
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