mirror of https://github.com/axmolengine/axmol.git
336 lines
8.6 KiB
C
336 lines
8.6 KiB
C
/****************************************************************************
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Copyright (c) 2010-2011 cocos2d-x.org
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Copyright (c) 2007 Scott Lembcke
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Copyright (c) 2010 Lam Pham
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http://www.cocos2d-x.org
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#ifndef __SUPPORT_CGPOINTEXTENSION_H__
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#define __SUPPORT_CGPOINTEXTENSION_H__
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/**
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@file
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CCPoint extensions based on Chipmunk's cpVect file.
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These extensions work both with CCPoint and cpVect.
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The "ccp" prefix means: "CoCos2d Point"
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Examples:
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- ccpAdd( ccp(1,1), ccp(2,2) ); // preferred cocos2d way
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- ccpAdd( CCPointMake(1,1), CCPointMake(2,2) ); // also ok but more verbose
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- cpvadd( cpv(1,1), cpv(2,2) ); // way of the chipmunk
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- ccpAdd( cpv(1,1), cpv(2,2) ); // mixing chipmunk and cocos2d (avoid)
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- cpvadd( CCPointMake(1,1), CCPointMake(2,2) ); // mixing chipmunk and CG (avoid)
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*/
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#include "CCGeometry.h"
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#include <math.h>
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NS_CC_BEGIN
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/** Helper macro that creates a CCPoint
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@return CCPoint
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@since v0.7.2
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*/
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#define ccp(__X__,__Y__) cocos2d::CCPointMake((float)(__X__), (float)(__Y__))
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/** Returns opposite of point.
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@return CCPoint
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@since v0.7.2
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*/
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static inline CCPoint
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ccpNeg(const CCPoint& v)
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{
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return ccp(-v.x, -v.y);
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}
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/** Calculates sum of two points.
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@return CCPoint
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@since v0.7.2
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*/
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static inline CCPoint
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ccpAdd(const CCPoint& v1, const CCPoint& v2)
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{
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return ccp(v1.x + v2.x, v1.y + v2.y);
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}
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/** Calculates difference of two points.
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@return CCPoint
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@since v0.7.2
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*/
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static inline CCPoint
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ccpSub(const CCPoint& v1, const CCPoint& v2)
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{
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return ccp(v1.x - v2.x, v1.y - v2.y);
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}
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/** Returns point multiplied by given factor.
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@return CCPoint
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@since v0.7.2
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*/
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static inline CCPoint
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ccpMult(const CCPoint& v, const CCFloat s)
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{
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return ccp(v.x*s, v.y*s);
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}
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/** Calculates midpoint between two points.
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@return CCPoint
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@since v0.7.2
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*/
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static inline CCPoint
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ccpMidpoint(const CCPoint& v1, const CCPoint& v2)
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{
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return ccpMult(ccpAdd(v1, v2), 0.5f);
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}
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/** Calculates dot product of two points.
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@return CCFloat
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@since v0.7.2
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*/
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static inline CCFloat
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ccpDot(const CCPoint& v1, const CCPoint& v2)
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{
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return v1.x*v2.x + v1.y*v2.y;
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}
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/** Calculates cross product of two points.
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@return CCFloat
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@since v0.7.2
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*/
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static inline CCFloat
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ccpCross(const CCPoint& v1, const CCPoint& v2)
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{
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return v1.x*v2.y - v1.y*v2.x;
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}
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/** Calculates perpendicular of v, rotated 90 degrees counter-clockwise -- cross(v, perp(v)) >= 0
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@return CCPoint
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@since v0.7.2
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*/
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static inline CCPoint
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ccpPerp(const CCPoint& v)
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{
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return ccp(-v.y, v.x);
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}
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/** Calculates perpendicular of v, rotated 90 degrees clockwise -- cross(v, rperp(v)) <= 0
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@return CCPoint
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@since v0.7.2
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*/
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static inline CCPoint
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ccpRPerp(const CCPoint& v)
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{
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return ccp(v.y, -v.x);
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}
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/** Calculates the projection of v1 over v2.
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@return CCPoint
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@since v0.7.2
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*/
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static inline CCPoint
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ccpProject(const CCPoint& v1, const CCPoint& v2)
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{
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return ccpMult(v2, ccpDot(v1, v2)/ccpDot(v2, v2));
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}
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/** Rotates two points.
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@return CCPoint
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@since v0.7.2
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*/
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static inline CCPoint
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ccpRotate(const CCPoint& v1, const CCPoint& v2)
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{
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return ccp(v1.x*v2.x - v1.y*v2.y, v1.x*v2.y + v1.y*v2.x);
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}
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/** Unrotates two points.
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@return CCPoint
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@since v0.7.2
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*/
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static inline CCPoint
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ccpUnrotate(const CCPoint& v1, const CCPoint& v2)
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{
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return ccp(v1.x*v2.x + v1.y*v2.y, v1.y*v2.x - v1.x*v2.y);
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}
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/** Calculates the square length of a CCPoint (not calling sqrt() )
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@return CCFloat
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@since v0.7.2
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*/
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static inline CCFloat
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ccpLengthSQ(const CCPoint& v)
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{
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return ccpDot(v, v);
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}
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/** Calculates the square distance between two points (not calling sqrt() )
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@return CCFloat
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@since v1.1
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*/
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static inline CCFloat
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ccpDistanceSQ(const CCPoint p1, const CCPoint p2)
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{
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return ccpLengthSQ(ccpSub(p1, p2));
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}
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/** Calculates distance between point an origin
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@return CCFloat
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@since v0.7.2
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*/
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CCFloat CC_DLL ccpLength(const CCPoint& v);
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/** Calculates the distance between two points
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@return CCFloat
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@since v0.7.2
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*/
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CCFloat CC_DLL ccpDistance(const CCPoint& v1, const CCPoint& v2);
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/** Returns point multiplied to a length of 1.
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@return CCPoint
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@since v0.7.2
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*/
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CCPoint CC_DLL ccpNormalize(const CCPoint& v);
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/** Converts radians to a normalized vector.
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@return CCPoint
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@since v0.7.2
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*/
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CCPoint CC_DLL ccpForAngle(const CCFloat a);
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/** Converts a vector to radians.
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@return CCFloat
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@since v0.7.2
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*/
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CCFloat CC_DLL ccpToAngle(const CCPoint& v);
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/** Clamp a value between from and to.
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@since v0.99.1
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*/
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float CC_DLL clampf(float value, float min_inclusive, float max_inclusive);
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/** Clamp a point between from and to.
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@since v0.99.1
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*/
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CCPoint CC_DLL ccpClamp(const CCPoint& p, const CCPoint& from, const CCPoint& to);
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/** Quickly convert CCSize to a CCPoint
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@since v0.99.1
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*/
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CCPoint CC_DLL ccpFromSize(const CCSize& s);
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/** Run a math operation function on each point component
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* absf, fllorf, ceilf, roundf
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* any function that has the signature: float func(float);
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* For example: let's try to take the floor of x,y
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* ccpCompOp(p,floorf);
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@since v0.99.1
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*/
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CCPoint CC_DLL ccpCompOp(const CCPoint& p, float (*opFunc)(float));
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/** Linear Interpolation between two points a and b
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@returns
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alpha == 0 ? a
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alpha == 1 ? b
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otherwise a value between a..b
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@since v0.99.1
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*/
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CCPoint CC_DLL ccpLerp(const CCPoint& a, const CCPoint& b, float alpha);
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/** @returns if points have fuzzy equality which means equal with some degree of variance.
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@since v0.99.1
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*/
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bool CC_DLL ccpFuzzyEqual(const CCPoint& a, const CCPoint& b, float variance);
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/** Multiplies a nd b components, a.x*b.x, a.y*b.y
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@returns a component-wise multiplication
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@since v0.99.1
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*/
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CCPoint CC_DLL ccpCompMult(const CCPoint& a, const CCPoint& b);
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/** @returns the signed angle in radians between two vector directions
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@since v0.99.1
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*/
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float CC_DLL ccpAngleSigned(const CCPoint& a, const CCPoint& b);
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/** @returns the angle in radians between two vector directions
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@since v0.99.1
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*/
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float CC_DLL ccpAngle(const CCPoint& a, const CCPoint& b);
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/** Rotates a point counter clockwise by the angle around a pivot
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@param v is the point to rotate
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@param pivot is the pivot, naturally
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@param angle is the angle of rotation cw in radians
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@returns the rotated point
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@since v0.99.1
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*/
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CCPoint CC_DLL ccpRotateByAngle(const CCPoint& v, const CCPoint& pivot, float angle);
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/** A general line-line intersection test
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@param p1
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is the startpoint for the first line P1 = (p1 - p2)
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@param p2
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is the endpoint for the first line P1 = (p1 - p2)
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@param p3
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is the startpoint for the second line P2 = (p3 - p4)
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@param p4
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is the endpoint for the second line P2 = (p3 - p4)
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@param s
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is the range for a hitpoint in P1 (pa = p1 + s*(p2 - p1))
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@param t
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is the range for a hitpoint in P3 (pa = p2 + t*(p4 - p3))
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@return bool
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indicating successful intersection of a line
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note that to truly test intersection for segments we have to make
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sure that s & t lie within [0..1] and for rays, make sure s & t > 0
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the hit point is p3 + t * (p4 - p3);
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the hit point also is p1 + s * (p2 - p1);
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@since v0.99.1
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*/
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bool CC_DLL ccpLineIntersect(const CCPoint& p1, const CCPoint& p2,
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const CCPoint& p3, const CCPoint& p4,
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float *s, float *t);
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/*
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ccpSegmentIntersect returns YES if Segment A-B intersects with segment C-D
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@since v1.0.0
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*/
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bool CC_DLL ccpSegmentIntersect(const CCPoint& A, const CCPoint& B, const CCPoint& C, const CCPoint& D);
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/*
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ccpIntersectPoint returns the intersection point of line A-B, C-D
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@since v1.0.0
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*/
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CCPoint CC_DLL ccpIntersectPoint(const CCPoint& A, const CCPoint& B, const CCPoint& C, const CCPoint& D);
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NS_CC_END
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#endif // __SUPPORT_CGPOINTEXTENSION_H__
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