axmol/cocos/physics/CCPhysicsShape.cpp

/****************************************************************************
 Copyright (c) 2013-2017 Chukong Technologies Inc.
 
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 Permission is hereby granted, free of charge, to any person obtaining a copy
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 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,
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 THE SOFTWARE.
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#include "physics/CCPhysicsShape.h"
#if CC_USE_PHYSICS

#include <climits>
#include <cmath>
#include <unordered_map>

#include "chipmunk/chipmunk.h"
#include "chipmunk/chipmunk_unsafe.h"

#include "physics/CCPhysicsBody.h"
#include "physics/CCPhysicsWorld.h"
#include "physics/CCPhysicsHelper.h"

NS_CC_BEGIN
extern const float PHYSICS_INFINITY;
static cpBody* s_sharedBody = nullptr;

PhysicsShape::PhysicsShape()
: _body(nullptr)
, _type(Type::UNKNOWN)
, _area(0.0f)
, _mass(0.0f)
, _moment(0.0f)
, _sensor(false)
, _scaleX(1.0f)
, _scaleY(1.0f)
, _newScaleX(1.0f)
, _newScaleY(1.0f)
, _tag(0)
, _categoryBitmask(UINT_MAX)
, _collisionBitmask(UINT_MAX)
, _contactTestBitmask(0)
, _group(0)
{
    if (s_sharedBody == nullptr)
    {
        s_sharedBody = cpBodyNewStatic();
    }
}

PhysicsShape::~PhysicsShape()
{
    for (auto shape : _cpShapes)
    {
        cpShapeFree(shape);
    }
}

void PhysicsShape::setMass(float mass)
{
    if (mass < 0)
    {
        return;
    }
    
    if (_body)
    {
        _body->addMass(-_mass);
        _body->addMass(mass);
    };
    
    _mass = mass;
}

void PhysicsShape::setMoment(float moment)
{
    if (moment < 0)
    {
        return;
    }
    
    if (_body)
    {
        _body->addMoment(-_moment);
        _body->addMoment(moment);
    };
    
    _moment = moment;
}

void PhysicsShape::setMaterial(const PhysicsMaterial& material)
{
    setDensity(material.density);
    setRestitution(material.restitution);
    setFriction(material.friction);
}

void PhysicsShape::setScale(float scaleX, float scaleY)
{
    if (std::abs(_scaleX - scaleX) > FLT_EPSILON || std::abs(_scaleY - scaleY) > FLT_EPSILON)
    {
        if (_type == Type::CIRCLE && scaleX != scaleY)
        {
            CCLOG("PhysicsShapeCircle WARNING: CANNOT support setScale with different x and y");
            return;
        }
        _newScaleX = scaleX;
        _newScaleY = scaleY;
        
        updateScale();
        
        // re-calculate area and mass
        _area = calculateArea();
        _mass = _material.density * _area;
        _moment = calculateDefaultMoment();
    }
}

void PhysicsShape::updateScale()
{
    _scaleX = _newScaleX;
    _scaleY = _newScaleY;
}

void PhysicsShape::addShape(cpShape* shape)
{
    if (shape)
    {
        cpShapeSetUserData(shape, this);
        cpShapeSetFilter(shape, cpShapeFilterNew(_group, CP_ALL_CATEGORIES, CP_ALL_CATEGORIES));
        _cpShapes.push_back(shape);
    }
}

PhysicsShapeCircle::PhysicsShapeCircle()
{
    
}

PhysicsShapeCircle::~PhysicsShapeCircle()
{
    
}

PhysicsShapeBox::PhysicsShapeBox()
{
    
}

PhysicsShapeBox::~PhysicsShapeBox()
{
    
}

PhysicsShapePolygon::PhysicsShapePolygon()
{
    
}

PhysicsShapePolygon::~PhysicsShapePolygon()
{
    
}

PhysicsShapeEdgeBox::PhysicsShapeEdgeBox()
{
    
}

PhysicsShapeEdgeBox::~PhysicsShapeEdgeBox()
{
    
}

PhysicsShapeEdgeChain::PhysicsShapeEdgeChain()
{
    
}

PhysicsShapeEdgeChain::~PhysicsShapeEdgeChain()
{
    
}

PhysicsShapeEdgePolygon::PhysicsShapeEdgePolygon()
{
    
}

PhysicsShapeEdgePolygon::~PhysicsShapeEdgePolygon()
{
    
}

PhysicsShapeEdgeSegment::PhysicsShapeEdgeSegment()
{
    
}

PhysicsShapeEdgeSegment::~PhysicsShapeEdgeSegment()
{
    
}

void PhysicsShape::setDensity(float density)
{
    if (density < 0)
    {
        return;
    }
    
    _material.density = density;
    
    if (_material.density == PHYSICS_INFINITY)
    {
        setMass(PHYSICS_INFINITY);
    }else if (_area > 0)
    {
        setMass(_material.density * _area);
    }
}

void PhysicsShape::setRestitution(float restitution)
{
    _material.restitution = restitution;
    
    for (cpShape* shape : _cpShapes)
    {
        cpShapeSetElasticity(shape, restitution);
    }
}

void PhysicsShape::setFriction(float friction)
{
    _material.friction = friction;
    
    for (cpShape* shape : _cpShapes)
    {
        cpShapeSetFriction(shape, friction);
    }
}

void PhysicsShape::setSensor(bool sensor)
{
    if (sensor != _sensor)
    {
        for (cpShape* shape : _cpShapes)
        {
            cpShapeSetSensor(shape, sensor);
        }
        _sensor = sensor;
    }
}

void PhysicsShape::recenterPoints(Vec2* points, int count, const Vec2& center)
{
    cpVect* cpvs = new cpVect[count];
    cpVect centroid = cpCentroidForPoly(count, cpvs);
    for(int i=0; i<count; i++){
        cpvs[i] = cpvsub(cpvs[i], centroid);
    }
    PhysicsHelper::cpvs2points(cpvs, points, count);
    delete[] cpvs;
    
    if (center != Vec2::ZERO)
    {
        for (int i = 0; i < count; ++i)
        {
            points[i] += center;
        }
    }
}

Vec2 PhysicsShape::getPolygonCenter(const Vec2* points, int count)
{
    cpVect* cpvs = new (std::nothrow) cpVect[count];
    cpVect center = cpCentroidForPoly(count, PhysicsHelper::points2cpvs(points, cpvs, count));
    delete[] cpvs;
    
    return PhysicsHelper::cpv2point(center);
}

Vec2 PhysicsShape::getPolyonCenter(const Vec2* points, int count)
{
    return getPolygonCenter(points, count);
}

void PhysicsShape::setBody(PhysicsBody *body)
{
    // already added
    if (body && _body == body)
    {
        return;
    }
    
    if (_body)
    {
        _body->removeShape(this);
    }
    
    for (auto shape : _cpShapes)
    {
        cpShapeSetBody(shape, body == nullptr ? s_sharedBody : body->_cpBody);
    }
    _body = body;
}

// PhysicsShapeCircle
PhysicsShapeCircle* PhysicsShapeCircle::create(float radius, const PhysicsMaterial& material/* = MaterialDefault*/, const Vec2& offset/* = Vec2(0, 0)*/)
{
    PhysicsShapeCircle* shape = new (std::nothrow) PhysicsShapeCircle();
    if (shape && shape->init(radius, material, offset))
    {
        shape->autorelease();
        return shape;
    }
    
    CC_SAFE_DELETE(shape);
    return nullptr;
}

bool PhysicsShapeCircle::init(float radius, const PhysicsMaterial& material/* = MaterialDefault*/, const Vec2& offset /*= Vec2(0, 0)*/)
{
    do
    {
        _type = Type::CIRCLE;
        
        auto shape = cpCircleShapeNew(s_sharedBody, radius, PhysicsHelper::point2cpv(offset));
        CC_BREAK_IF(shape == nullptr);
        cpShapeSetUserData(shape, this);
        
        addShape(shape);
        
        _area = calculateArea();
        _mass = material.density == PHYSICS_INFINITY ? PHYSICS_INFINITY : material.density * _area;
        _moment = calculateDefaultMoment();
        
        setMaterial(material);
        return true;
    } while (false);
    
    return false;
}

float PhysicsShapeCircle::calculateArea(float radius)
{
    return PhysicsHelper::cpfloat2float(cpAreaForCircle(0, radius));
}

float PhysicsShapeCircle::calculateMoment(float mass, float radius, const Vec2& offset)
{
    return mass == PHYSICS_INFINITY ? PHYSICS_INFINITY
    : PhysicsHelper::cpfloat2float(cpMomentForCircle(mass,
                                                     0,
                                                     radius,
                                                     PhysicsHelper::point2cpv(offset)));
}

float PhysicsShapeCircle::calculateArea()
{
    return PhysicsHelper::cpfloat2float(cpAreaForCircle(0, cpCircleShapeGetRadius(_cpShapes.front())));
}

float PhysicsShapeCircle::calculateDefaultMoment()
{
    auto shape = _cpShapes.front();
    
    return _mass == PHYSICS_INFINITY ? PHYSICS_INFINITY
    : PhysicsHelper::cpfloat2float(cpMomentForCircle(_mass,
                                                     0,
                                                     cpCircleShapeGetRadius(shape),
                                                     cpCircleShapeGetOffset(shape)));
}

float PhysicsShapeCircle::getRadius() const
{
    return PhysicsHelper::cpfloat2float(cpCircleShapeGetRadius(_cpShapes.front()));
}

Vec2 PhysicsShapeCircle::getOffset()
{
    return PhysicsHelper::cpv2point(cpCircleShapeGetOffset(_cpShapes.front()));
}

void PhysicsShapeCircle::updateScale()
{
    cpFloat factor = std::abs(_newScaleX / _scaleX);

    cpShape* shape = _cpShapes.front();
    cpVect v = cpCircleShapeGetOffset(shape);
    v = cpvmult(v, factor);
    cpCircleShapeSetOffset(shape, v);

    cpCircleShapeSetRadius(shape, cpCircleShapeGetRadius(shape) * factor);

    PhysicsShape::updateScale();
}

// PhysicsShapeEdgeSegment
PhysicsShapeEdgeSegment* PhysicsShapeEdgeSegment::create(const Vec2& a, const Vec2& b, const PhysicsMaterial& material/* = MaterialDefault*/, float border/* = 1*/)
{
    PhysicsShapeEdgeSegment* shape = new (std::nothrow) PhysicsShapeEdgeSegment();
    if (shape && shape->init(a, b, material, border))
    {
        shape->autorelease();
        return shape;
    }
    
    CC_SAFE_DELETE(shape);
    return nullptr;
}

bool PhysicsShapeEdgeSegment::init(const Vec2& a, const Vec2& b, const PhysicsMaterial& material/* = MaterialDefault*/, float border/* = 1*/)
{
    do
    {
        _type = Type::EDGESEGMENT;
        
        auto shape = cpSegmentShapeNew(s_sharedBody,
                                           PhysicsHelper::point2cpv(a),
                                           PhysicsHelper::point2cpv(b),
                                           border);
        CC_BREAK_IF(shape == nullptr);
        cpShapeSetUserData(shape, this);
        
        addShape(shape);
        
        _mass = PHYSICS_INFINITY;
        _moment = PHYSICS_INFINITY;
        
        setMaterial(material);
        
        return true;
    } while (false);
    
    return false;
}

Vec2 PhysicsShapeEdgeSegment::getPointA() const
{
    return PhysicsHelper::cpv2point(cpSegmentShapeGetA(_cpShapes.front()));
}

Vec2 PhysicsShapeEdgeSegment::getPointB() const
{
    return PhysicsHelper::cpv2point(cpSegmentShapeGetB(_cpShapes.front()));
}

Vec2 PhysicsShapeEdgeSegment::getCenter()
{
    auto a = PhysicsHelper::cpv2point(cpSegmentShapeGetA(_cpShapes.front()));
    auto b = PhysicsHelper::cpv2point(cpSegmentShapeGetB(_cpShapes.front()));
    return ( a + b ) / 2;
}

void PhysicsShapeEdgeSegment::updateScale()
{
    cpFloat factorX = _newScaleX / _scaleX;
    cpFloat factorY = _newScaleY / _scaleY;

    cpShape* shape = _cpShapes.front();
    cpVect a = cpSegmentShapeGetA(shape);
    a.x *= factorX;
    a.y *= factorY;
    cpVect b = cpSegmentShapeGetB(shape);
    b.x *= factorX;
    b.y *= factorY;
    cpSegmentShapeSetEndpoints(shape, a, b);

    PhysicsShape::updateScale();
}

// PhysicsShapeBox
PhysicsShapeBox* PhysicsShapeBox::create(const Size& size, const PhysicsMaterial& material/* = MaterialDefault*/, const Vec2& offset/* = Vec2(0, 0)*/, float radius/* = 0.0f*/)
{
    PhysicsShapeBox* shape = new (std::nothrow) PhysicsShapeBox();
    if (shape && shape->init(size, material, offset, radius))
    {
        shape->autorelease();
        return shape;
    }
    
    CC_SAFE_DELETE(shape);
    return nullptr;
}

bool PhysicsShapeBox::init(const Size& size, const PhysicsMaterial& material/* = MaterialDefault*/, const Vec2& offset /*= Vec2(0, 0)*/, float radius/* = 0.0f*/)
{
    do
    {
        _type = Type::BOX;
        
        auto wh = PhysicsHelper::size2cpv(size);
        cpVect vec[4] =
        {
            {-wh.x/2.0f, -wh.y/2.0f}, {-wh.x/2.0f, wh.y/2.0f}, {wh.x/2.0f, wh.y/2.0f}, {wh.x/2.0f, -wh.y/2.0f}
        };
        
        cpTransform transform = cpTransformTranslate(PhysicsHelper::point2cpv(offset));
        
        auto shape = cpPolyShapeNew(s_sharedBody, 4, vec, transform, radius);
        CC_BREAK_IF(shape == nullptr);
        cpShapeSetUserData(shape, this);
        
        addShape(shape);
        
        _area = calculateArea();
        _mass = material.density == PHYSICS_INFINITY ? PHYSICS_INFINITY : material.density * _area;
        _moment = calculateDefaultMoment();
        
        setMaterial(material);
        
        return true;
    } while (false);
    
    return false;
}

Size PhysicsShapeBox::getSize() const
{
    cpShape* shape = _cpShapes.front();
    return PhysicsHelper::cpv2size(cpv(cpvdist(cpPolyShapeGetVert(shape, 1), cpPolyShapeGetVert(shape, 2)),
                                       cpvdist(cpPolyShapeGetVert(shape, 0), cpPolyShapeGetVert(shape, 1))));
}

// PhysicsShapePolygon
PhysicsShapePolygon* PhysicsShapePolygon::create(const Vec2* points, int count, const PhysicsMaterial& material/* = MaterialDefault*/, const Vec2& offset/* = Vec2(0, 0)*/, float radius/* = 0.0f*/)
{
    PhysicsShapePolygon* shape = new (std::nothrow) PhysicsShapePolygon();
    if (shape && shape->init(points, count, material, offset, radius))
    {
        shape->autorelease();
        return shape;
    }
    
    CC_SAFE_DELETE(shape);
    return nullptr;
}

bool PhysicsShapePolygon::init(const Vec2* points, int count, const PhysicsMaterial& material/* = MaterialDefault*/, const Vec2& offset/* = Vec2(0, 0)*/, float radius/* = 0.0f*/)
{
    do
    {
        _type = Type::POLYGON;
        
        auto vecs = new (std::nothrow) cpVect[count];
        PhysicsHelper::points2cpvs(points, vecs, count);        //count = cpConvexHull((int)count, vecs, nullptr, nullptr, 0);
        cpTransform transform = cpTransformTranslate(PhysicsHelper::point2cpv(offset));
        auto shape = cpPolyShapeNew(s_sharedBody, count, vecs, transform, radius);
        CC_SAFE_DELETE_ARRAY(vecs);
        
        CC_BREAK_IF(shape == nullptr);
        cpShapeSetUserData(shape, this);
        
        addShape(shape);
        
        _area = calculateArea();
        _mass = material.density == PHYSICS_INFINITY ? PHYSICS_INFINITY : material.density * _area;
        _moment = calculateDefaultMoment();
        
        setMaterial(material);
        
        return true;
    } while (false);
    
    return false;
}

float PhysicsShapePolygon::calculateArea(const Vec2* points, int count)
{
    cpVect* vecs = new (std::nothrow) cpVect[count];
    PhysicsHelper::points2cpvs(points, vecs, count);
    float area = PhysicsHelper::cpfloat2float(cpAreaForPoly(count, vecs, 0.0f));
    CC_SAFE_DELETE_ARRAY(vecs);
    
    return area;
}

float PhysicsShapePolygon::calculateMoment(float mass, const Vec2* points, int count, const Vec2& offset, float radius)
{
    cpVect* vecs = new (std::nothrow) cpVect[count];
    PhysicsHelper::points2cpvs(points, vecs, count);
    float moment = mass == PHYSICS_INFINITY ? PHYSICS_INFINITY
    : PhysicsHelper::cpfloat2float(cpMomentForPoly(mass, count, vecs, PhysicsHelper::point2cpv(offset), radius));
    CC_SAFE_DELETE_ARRAY(vecs);
    
    return moment;
}

float PhysicsShapePolygon::calculateArea()
{
    auto shape = _cpShapes.front();
    int count = cpPolyShapeGetCount(shape);
    cpVect* vecs = new cpVect[count];
    for(int i=0;i<count;++i)
        vecs[i] = cpPolyShapeGetVert(shape, i);
    float area = PhysicsHelper::cpfloat2float(cpAreaForPoly(count, vecs, cpPolyShapeGetRadius(shape)));
    CC_SAFE_DELETE_ARRAY(vecs);
    return area;
}

float PhysicsShapePolygon::calculateDefaultMoment()
{
    if(_mass == PHYSICS_INFINITY)
    {
        return PHYSICS_INFINITY;
    }
    else
    {
        auto shape = _cpShapes.front();
        int count = cpPolyShapeGetCount(shape);
        cpVect* vecs = new cpVect[count];
        for(int i=0;i<count;++i)
            vecs[i] = cpPolyShapeGetVert(shape, i);
        float moment = PhysicsHelper::cpfloat2float(cpMomentForPoly(_mass, count, vecs, cpvzero, cpPolyShapeGetRadius(shape)));
        CC_SAFE_DELETE_ARRAY(vecs);
        return moment;
    }
}

Vec2 PhysicsShapePolygon::getPoint(int i) const
{
    return PhysicsHelper::cpv2point(cpPolyShapeGetVert(_cpShapes.front(), i));
}

void PhysicsShapePolygon::getPoints(Vec2* outPoints) const
{
    auto shape = _cpShapes.front();
    int count = cpPolyShapeGetCount(shape);
    cpVect* vecs = new cpVect[count];
    for(int i=0;i<count;++i)
        vecs[i] = cpPolyShapeGetVert(shape, i);
    PhysicsHelper::cpvs2points(vecs, outPoints, count);
    CC_SAFE_DELETE_ARRAY(vecs);
}

int PhysicsShapePolygon::getPointsCount() const
{
    return cpPolyShapeGetCount(_cpShapes.front());
}

Vec2 PhysicsShapePolygon::getCenter()
{
    auto shape = _cpShapes.front();
    int count = cpPolyShapeGetCount(shape);
    cpVect* vecs = new cpVect[count];
    for(int i=0;i<count;++i)
        vecs[i] = cpPolyShapeGetVert(shape, i);
    
    Vec2 center =  PhysicsHelper::cpv2point(cpCentroidForPoly(count, vecs));
    CC_SAFE_DELETE_ARRAY(vecs);
    
    return center;
}

void PhysicsShapePolygon::updateScale()
{
    cpFloat factorX = _newScaleX / _scaleX;
    cpFloat factorY = _newScaleY / _scaleY;

    auto shape = _cpShapes.front();
    int count = cpPolyShapeGetCount(shape);
    cpVect* vects = new cpVect[count];
    for(int i=0;i<count;++i)
        vects[i] = cpPolyShapeGetVert(shape, i);

    for (int i = 0; i < count; ++i)
    {
        vects[i].x *= factorX;
        vects[i].y *= factorY;
    }

    // convert hole to clockwise
    if (factorX * factorY < 0)
    {
        for (int i = 0; i < count / 2; ++i)
        {
            cpVect v = vects[i];
            vects[i] = vects[count - i - 1];
            vects[count - i - 1] = v;
        }
    }
    
    cpPolyShapeSetVertsRaw(shape, count, vects);
    CC_SAFE_DELETE_ARRAY(vects);
    
    PhysicsShape::updateScale();
}

// PhysicsShapeEdgeBox
PhysicsShapeEdgeBox* PhysicsShapeEdgeBox::create(const Size& size, const PhysicsMaterial& material/* = MaterialDefault*/, float border/* = 1*/, const Vec2& offset/* = Vec2(0, 0)*/)
{
    PhysicsShapeEdgeBox* shape = new (std::nothrow) PhysicsShapeEdgeBox();
    if (shape && shape->init(size, material, border, offset))
    {
        shape->autorelease();
        return shape;
    }
    
    CC_SAFE_DELETE(shape);
    return nullptr;
}

bool PhysicsShapeEdgeBox::init(const Size& size, const PhysicsMaterial& material/* = MaterialDefault*/, float border/* = 1*/, const Vec2& offset/*= Vec2(0, 0)*/)
{
    do
    {
        _type = Type::EDGEBOX;
        
        cpVect vec[4] = {};
        vec[0] = PhysicsHelper::point2cpv(Vec2(-size.width/2+offset.x, -size.height/2+offset.y));
        vec[1] = PhysicsHelper::point2cpv(Vec2(+size.width/2+offset.x, -size.height/2+offset.y));
        vec[2] = PhysicsHelper::point2cpv(Vec2(+size.width/2+offset.x, +size.height/2+offset.y));
        vec[3] = PhysicsHelper::point2cpv(Vec2(-size.width/2+offset.x, +size.height/2+offset.y));
        
        int i = 0;
        for (; i < 4; ++i)
        {
            auto shape = cpSegmentShapeNew(s_sharedBody, vec[i], vec[(i + 1) % 4], border);
            CC_BREAK_IF(shape == nullptr);
            cpShapeSetUserData(shape, this);
            addShape(shape);
        }
        CC_BREAK_IF(i < 4);
        
        _mass = PHYSICS_INFINITY;
        _moment = PHYSICS_INFINITY;
        
        setMaterial(material);
        
        return true;
    } while (false);
    
    return false;
}

// PhysicsShapeEdgeBox
PhysicsShapeEdgePolygon* PhysicsShapeEdgePolygon::create(const Vec2* points, int count, const PhysicsMaterial& material/* = MaterialDefault*/, float border/* = 1*/)
{
    PhysicsShapeEdgePolygon* shape = new (std::nothrow) PhysicsShapeEdgePolygon();
    if (shape && shape->init(points, count, material, border))
    {
        shape->autorelease();
        return shape;
    }
    
    CC_SAFE_DELETE(shape);
    return nullptr;
}

bool PhysicsShapeEdgePolygon::init(const Vec2* points, int count, const PhysicsMaterial& material/* = MaterialDefault*/, float border/* = 1*/)
{
    cpVect* vec = nullptr;
    do
    {
        _type = Type::EDGEPOLYGON;
        
        vec = new (std::nothrow) cpVect[count];
        PhysicsHelper::points2cpvs(points, vec, count);
        
        int i = 0;
        for (; i < count; ++i)
        {
            auto shape = cpSegmentShapeNew(s_sharedBody, vec[i], vec[(i + 1) % count], border);
            CC_BREAK_IF(shape == nullptr);
            cpShapeSetUserData(shape, this);
            cpShapeSetElasticity(shape, 1.0f);
            cpShapeSetFriction(shape, 1.0f);
            addShape(shape);
        }
        CC_SAFE_DELETE_ARRAY(vec);
        
        CC_BREAK_IF(i < count);
        
        _mass = PHYSICS_INFINITY;
        _moment = PHYSICS_INFINITY;
        
        setMaterial(material);
        
        return true;
    } while (false);
    
    CC_SAFE_DELETE_ARRAY(vec);
    
    return false;
}

Vec2 PhysicsShapeEdgePolygon::getCenter()
{
    int count = (int)_cpShapes.size();
    cpVect* points = new (std::nothrow) cpVect[count];
    int i = 0;
    for(auto shape : _cpShapes)
    {
        points[i++] = cpSegmentShapeGetA(shape);
    }
    
    Vec2 center = PhysicsHelper::cpv2point(cpCentroidForPoly(count, points));
    delete[] points;
    
    return center;
}

void PhysicsShapeEdgePolygon::getPoints(cocos2d::Vec2 *outPoints) const
{
    int i = 0;
    for(auto shape : _cpShapes)
    {
        outPoints[i++] = PhysicsHelper::cpv2point(cpSegmentShapeGetA(shape));
    }
}

int PhysicsShapeEdgePolygon::getPointsCount() const
{
    return static_cast<int>(_cpShapes.size());
}

// PhysicsShapeEdgeChain
PhysicsShapeEdgeChain* PhysicsShapeEdgeChain::create(const Vec2* points, int count, const PhysicsMaterial& material/* = MaterialDefault*/, float border/* = 1*/)
{
    PhysicsShapeEdgeChain* shape = new (std::nothrow) PhysicsShapeEdgeChain();
    if (shape && shape->init(points, count, material, border))
    {
        shape->autorelease();
        return shape;
    }
    
    CC_SAFE_DELETE(shape);
    return nullptr;
}

void PhysicsShapeEdgePolygon::updateScale()
{
    cpFloat factorX = _newScaleX / _scaleX;
    cpFloat factorY = _newScaleY / _scaleY;

    for (auto shape : _cpShapes)
    {
        cpVect a = cpSegmentShapeGetA(shape);
        a.x *= factorX;
        a.y *= factorY;
        cpVect b = cpSegmentShapeGetB(shape);
        b.x *= factorX;
        b.y *= factorY;
        cpSegmentShapeSetEndpoints(shape, a, b);
    }
    
    PhysicsShape::updateScale();
}

bool PhysicsShapeEdgeChain::init(const Vec2* points, int count, const PhysicsMaterial& material/* = MaterialDefault*/, float border/* = 1*/)
{
    cpVect* vec = nullptr;
    do
    {
        _type = Type::EDGECHAIN;
        
        vec = new (std::nothrow) cpVect[count];
        PhysicsHelper::points2cpvs(points, vec, count);
        
        int i = 0;
        for (; i < count - 1; ++i)
        {
            auto shape = cpSegmentShapeNew(s_sharedBody, vec[i], vec[i + 1], border);
            CC_BREAK_IF(shape == nullptr);
            cpShapeSetUserData(shape, this);
            cpShapeSetElasticity(shape, 1.0f);
            cpShapeSetFriction(shape, 1.0f);
            addShape(shape);
        }
        CC_SAFE_DELETE_ARRAY(vec);
        CC_BREAK_IF(i < count - 1);
        
        _mass = PHYSICS_INFINITY;
        _moment = PHYSICS_INFINITY;
        
        setMaterial(material);
        
        return true;
    } while (false);
    
    CC_SAFE_DELETE_ARRAY(vec);
    
    return false;
}

Vec2 PhysicsShapeEdgeChain::getCenter()
{
    int count = (int)_cpShapes.size() + 1;
    cpVect* points = new (std::nothrow) cpVect[count];
    int i = 0;
    for(auto shape : _cpShapes)
    {
        points[i++] = cpSegmentShapeGetA(shape);
    }
    
    points[i++] = cpSegmentShapeGetB(_cpShapes.back());
    
    Vec2 center = PhysicsHelper::cpv2point(cpCentroidForPoly(count, points));
    delete[] points;
    
    return center;
}

void PhysicsShapeEdgeChain::getPoints(Vec2* outPoints) const
{
    int i = 0;
    for(auto shape : _cpShapes)
    {
        outPoints[i++] = PhysicsHelper::cpv2point(cpSegmentShapeGetA(shape));
    }
    
    outPoints[i++] = PhysicsHelper::cpv2point(cpSegmentShapeGetB(_cpShapes.back()));
}

int PhysicsShapeEdgeChain::getPointsCount() const
{
    return static_cast<int>(_cpShapes.size() + 1);
}

void PhysicsShapeEdgeChain::updateScale()
{
    cpFloat factorX = _newScaleX / _scaleX;
    cpFloat factorY = _newScaleY / _scaleY;

    for (auto shape : _cpShapes)
    {
        cpVect a = cpSegmentShapeGetA(shape);
        a.x *= factorX;
        a.y *= factorY;
        cpVect b = cpSegmentShapeGetB(shape);
        b.x *= factorX;
        b.y *= factorY;
        cpSegmentShapeSetEndpoints(shape, a, b);
    }
    
    PhysicsShape::updateScale();
}

void PhysicsShape::setGroup(int group)
{
    if (group < 0)
    {
        for (auto shape : _cpShapes)
        {
            cpShapeSetFilter(shape, cpShapeFilterNew(group, CP_ALL_CATEGORIES, CP_ALL_CATEGORIES));
        }
    }
    
    _group = group;
}

bool PhysicsShape::containsPoint(const Vec2& point) const
{
    for (auto shape : _cpShapes)
    {
        if (cpShapePointQuery(shape, PhysicsHelper::point2cpv(point), nullptr) < 0)
        {
            return true;
        }
    }
    
    return false;
}

NS_CC_END

#endif // CC_USE_PHYSICS