mirror of https://github.com/axmolengine/axmol.git
270 lines
8.0 KiB
C++
270 lines
8.0 KiB
C++
/****************************************************************************
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Copyright (c) 2010 cocos2d-x.org
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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 __CCGEMETRY_H__
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#define __CCGEMETRY_H__
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#include "platform/CCPlatformMacros.h"
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#include "CCObject.h"
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#include <math.h>
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NS_CC_BEGIN
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/**
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* @addtogroup data_structures
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* @{
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*/
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// for CCPoint assignement operator and copy constructor
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class CC_DLL CCSize;
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class CC_DLL CCPoint
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{
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public:
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float x;
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float y;
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public:
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CCPoint();
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CCPoint(float x, float y);
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CCPoint(const CCPoint& other);
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CCPoint(const CCSize& size);
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CCPoint& operator= (const CCPoint& other);
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CCPoint& operator= (const CCSize& size);
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CCPoint operator+(const CCPoint& right) const;
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CCPoint operator-(const CCPoint& right) const;
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CCPoint operator-() const;
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CCPoint operator*(float a) const;
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CCPoint operator/(float a) const;
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void setPoint(float x, float y);
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bool equals(const CCPoint& target) const;
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/** @returns if points have fuzzy equality which means equal with some degree of variance.
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@since v2.1.4
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*/
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bool fuzzyEquals(const CCPoint& target, float variance) const;
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/** Calculates distance between point an origin
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@return float
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@since v2.1.4
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*/
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inline float getLength() const {
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return sqrtf(x*x + y*y);
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};
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/** Calculates the square length of a CCPoint (not calling sqrt() )
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@return float
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@since v2.1.4
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*/
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inline float getLengthSq() const {
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return dot(*this); //x*x + y*y;
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};
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/** Calculates the square distance between two points (not calling sqrt() )
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@return float
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@since v2.1.4
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*/
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inline float getDistanceSq(const CCPoint& other) const {
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return (*this - other).getLengthSq();
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};
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/** Calculates the distance between two points
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@return float
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@since v2.1.4
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*/
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inline float getDistance(const CCPoint& other) const {
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return (*this - other).getLength();
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};
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/** @returns the angle in radians between this vector and the x axis
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@since v2.1.4
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*/
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inline float getAngle() const {
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return atan2f(y, x);
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};
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/** @returns the angle in radians between two vector directions
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@since v2.1.4
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*/
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float getAngle(const CCPoint& other) const;
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/** Calculates dot product of two points.
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@return float
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@since v2.1.4
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*/
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inline float dot(const CCPoint& other) const {
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return x*other.x + y*other.y;
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};
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/** Calculates cross product of two points.
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@return float
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@since v2.1.4
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*/
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inline float cross(const CCPoint& other) const {
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return x*other.y - y*other.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 v2.1.4
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*/
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inline CCPoint getPerp() const {
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return CCPoint(-y, 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 v2.1.4
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*/
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inline CCPoint getRPerp() const {
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return CCPoint(y, -x);
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};
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/** Calculates the projection of this over other.
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@return CCPoint
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@since v2.1.4
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*/
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inline CCPoint project(const CCPoint& other) const {
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return other * (dot(other)/other.dot(other));
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};
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/** Complex multiplication of two points ("rotates" two points).
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@return CCPoint vector with an angle of this.getAngle() + other.getAngle(),
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and a length of this.getLength() * other.getLength().
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@since v2.1.4
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*/
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inline CCPoint rotate(const CCPoint& other) const {
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return CCPoint(x*other.x - y*other.y, x*other.y + y*other.x);
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};
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/** Unrotates two points.
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@return CCPoint vector with an angle of this.getAngle() - other.getAngle(),
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and a length of this.getLength() * other.getLength().
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@since v2.1.4
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*/
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inline CCPoint unrotate(const CCPoint& other) const {
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return CCPoint(x*other.x + y*other.y, y*other.x - x*other.y);
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};
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/** Returns point multiplied to a length of 1.
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* If the point is 0, it returns (1, 0)
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@return CCPoint
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@since v2.1.4
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*/
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inline CCPoint normalize() const {
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float length = getLength();
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if(length == 0.) return CCPoint(1.f, 0);
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return *this / getLength();
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};
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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 v2.1.4
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*/
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inline CCPoint lerp(const CCPoint& other, float alpha) const {
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return *this * (1.f - alpha) + other * alpha;
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};
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/** Rotates a point counter clockwise by the angle around a pivot
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@param pivot is the pivot, naturally
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@param angle is the angle of rotation ccw in radians
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@returns the rotated point
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@since v2.1.4
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*/
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CCPoint rotateByAngle(const CCPoint& pivot, float angle) const;
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static inline CCPoint forAngle(const float a)
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{
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return CCPoint(cosf(a), sinf(a));
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}
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};
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class CC_DLL CCSize
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{
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public:
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float width;
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float height;
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public:
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CCSize();
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CCSize(float width, float height);
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CCSize(const CCSize& other);
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CCSize(const CCPoint& point);
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CCSize& operator= (const CCSize& other);
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CCSize& operator= (const CCPoint& point);
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CCSize operator+(const CCSize& right) const;
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CCSize operator-(const CCSize& right) const;
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CCSize operator*(float a) const;
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CCSize operator/(float a) const;
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void setSize(float width, float height);
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bool equals(const CCSize& target) const;
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};
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class CC_DLL CCRect
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{
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public:
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CCPoint origin;
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CCSize size;
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public:
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CCRect();
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CCRect(float x, float y, float width, float height);
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CCRect(const CCRect& other);
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CCRect& operator= (const CCRect& other);
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void setRect(float x, float y, float width, float height);
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float getMinX() const; /// return the leftmost x-value of current rect
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float getMidX() const; /// return the midpoint x-value of current rect
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float getMaxX() const; /// return the rightmost x-value of current rect
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float getMinY() const; /// return the bottommost y-value of current rect
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float getMidY() const; /// return the midpoint y-value of current rect
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float getMaxY() const; /// return the topmost y-value of current rect
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bool equals(const CCRect& rect) const;
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bool containsPoint(const CCPoint& point) const;
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bool intersectsRect(const CCRect& rect) const;
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};
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#define CCPointMake(x, y) CCPoint((float)(x), (float)(y))
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#define CCSizeMake(width, height) CCSize((float)(width), (float)(height))
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#define CCRectMake(x, y, width, height) CCRect((float)(x), (float)(y), (float)(width), (float)(height))
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const CCPoint CCPointZero = CCPointMake(0,0);
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/* The "zero" size -- equivalent to CCSizeMake(0, 0). */
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const CCSize CCSizeZero = CCSizeMake(0,0);
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/* The "zero" rectangle -- equivalent to CCRectMake(0, 0, 0, 0). */
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const CCRect CCRectZero = CCRectMake(0,0,0,0);
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// end of data_structure group
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/// @}
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NS_CC_END
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#endif // __CCGEMETRY_H__
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