axmol/core/physics/CCPhysicsShape.cpp

/****************************************************************************
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 https://axis-project.github.io/

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 all copies or substantial portions of the Software.

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#include "physics/CCPhysicsShape.h"
#if AX_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_AX_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)
        {
            AXLOG("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 cpVect[count];
    cpVect center = cpCentroidForPoly(count, PhysicsHelper::points2cpvs(points, cpvs, count));
    delete[] cpvs;

    return PhysicsHelper::cpv2vec2(center);
}

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 PhysicsShapeCircle();
    if (shape->init(radius, material, offset))
    {
        shape->autorelease();
        return shape;
    }

    AX_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::vec22cpv(offset));
        AX_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::vec22cpv(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::cpv2vec2(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 PhysicsShapeEdgeSegment();
    if (shape->init(a, b, material, border))
    {
        shape->autorelease();
        return shape;
    }

    AX_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::vec22cpv(a), PhysicsHelper::vec22cpv(b), border);
        AX_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::cpv2vec2(cpSegmentShapeGetA(_cpShapes.front()));
}

Vec2 PhysicsShapeEdgeSegment::getPointB() const
{
    return PhysicsHelper::cpv2vec2(cpSegmentShapeGetB(_cpShapes.front()));
}

Vec2 PhysicsShapeEdgeSegment::getCenter()
{
    auto a = PhysicsHelper::cpv2vec2(cpSegmentShapeGetA(_cpShapes.front()));
    auto b = PhysicsHelper::cpv2vec2(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 Vec2& size,
                                         const PhysicsMaterial& material /* = MaterialDefault*/,
                                         const Vec2& offset /* = Vec2(0, 0)*/,
                                         float radius /* = 0.0f*/)
{
    PhysicsShapeBox* shape = new PhysicsShapeBox();
    if (shape->init(size, material, offset, radius))
    {
        shape->autorelease();
        return shape;
    }

    AX_SAFE_DELETE(shape);
    return nullptr;
}

bool PhysicsShapeBox::init(const Vec2& size,
                           const PhysicsMaterial& material /* = MaterialDefault*/,
                           const Vec2& offset /*= Vec2(0, 0)*/,
                           float radius /* = 0.0f*/)
{
    do
    {
        _type = Type::BOX;

        auto wh       = PhysicsHelper::vec22cpv(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::vec22cpv(offset));

        auto shape = cpPolyShapeNew(s_sharedBody, 4, vec, transform, radius);
        AX_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;
}

Vec2 PhysicsShapeBox::getSize() const
{
    cpShape* shape = _cpShapes.front();
    return PhysicsHelper::cpv2vec2(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 PhysicsShapePolygon();
    if (shape->init(points, count, material, offset, radius))
    {
        shape->autorelease();
        return shape;
    }

    AX_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 cpVect[count];
        PhysicsHelper::points2cpvs(points, vecs, count);  // count = cpConvexHull((int)count, vecs, nullptr, nullptr,
                                                          // 0);
        cpTransform transform = cpTransformTranslate(PhysicsHelper::vec22cpv(offset));
        auto shape            = cpPolyShapeNew(s_sharedBody, count, vecs, transform, radius);
        AX_SAFE_DELETE_ARRAY(vecs);

        AX_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 cpVect[count];
    PhysicsHelper::points2cpvs(points, vecs, count);
    float area = PhysicsHelper::cpfloat2float(cpAreaForPoly(count, vecs, 0.0f));
    AX_SAFE_DELETE_ARRAY(vecs);

    return area;
}

float PhysicsShapePolygon::calculateMoment(float mass, const Vec2* points, int count, const Vec2& offset, float radius)
{
    cpVect* vecs = new cpVect[count];
    PhysicsHelper::points2cpvs(points, vecs, count);
    float moment =
        mass == PHYSICS_INFINITY
            ? PHYSICS_INFINITY
            : PhysicsHelper::cpfloat2float(cpMomentForPoly(mass, count, vecs, PhysicsHelper::vec22cpv(offset), radius));
    AX_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)));
    AX_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)));
        AX_SAFE_DELETE_ARRAY(vecs);
        return moment;
    }
}

Vec2 PhysicsShapePolygon::getPoint(int i) const
{
    return PhysicsHelper::cpv2vec2(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);
    AX_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::cpv2vec2(cpCentroidForPoly(count, vecs));
    AX_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);
    AX_SAFE_DELETE_ARRAY(vects);

    PhysicsShape::updateScale();
}

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

    AX_SAFE_DELETE(shape);
    return nullptr;
}

bool PhysicsShapeEdgeBox::init(const Vec2& size,
                               const PhysicsMaterial& material /* = MaterialDefault*/,
                               float border /* = 1*/,
                               const Vec2& offset /*= Vec2(0, 0)*/)
{
    do
    {
        _type = Type::EDGEBOX;

        cpVect vec[4] = {};
        vec[0]        = PhysicsHelper::vec22cpv(Vec2(-size.width / 2 + offset.x, -size.height / 2 + offset.y));
        vec[1]        = PhysicsHelper::vec22cpv(Vec2(+size.width / 2 + offset.x, -size.height / 2 + offset.y));
        vec[2]        = PhysicsHelper::vec22cpv(Vec2(+size.width / 2 + offset.x, +size.height / 2 + offset.y));
        vec[3]        = PhysicsHelper::vec22cpv(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);
            AX_BREAK_IF(shape == nullptr);
            cpShapeSetUserData(shape, this);
            addShape(shape);
        }
        AX_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 PhysicsShapeEdgePolygon();
    if (shape->init(points, count, material, border))
    {
        shape->autorelease();
        return shape;
    }

    AX_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 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);
            AX_BREAK_IF(shape == nullptr);
            cpShapeSetUserData(shape, this);
            cpShapeSetElasticity(shape, 1.0f);
            cpShapeSetFriction(shape, 1.0f);
            addShape(shape);
        }
        AX_SAFE_DELETE_ARRAY(vec);

        AX_BREAK_IF(i < count);

        _mass   = PHYSICS_INFINITY;
        _moment = PHYSICS_INFINITY;

        setMaterial(material);

        return true;
    } while (false);

    AX_SAFE_DELETE_ARRAY(vec);

    return false;
}

Vec2 PhysicsShapeEdgePolygon::getCenter()
{
    int count      = (int)_cpShapes.size();
    cpVect* points = new cpVect[count];
    int i          = 0;
    for (auto&& shape : _cpShapes)
    {
        points[i++] = cpSegmentShapeGetA(shape);
    }

    Vec2 center = PhysicsHelper::cpv2vec2(cpCentroidForPoly(count, points));
    delete[] points;

    return center;
}

void PhysicsShapeEdgePolygon::getPoints(axis::Vec2* outPoints) const
{
    int i = 0;
    for (auto&& shape : _cpShapes)
    {
        outPoints[i++] = PhysicsHelper::cpv2vec2(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 PhysicsShapeEdgeChain();
    if (shape->init(points, count, material, border))
    {
        shape->autorelease();
        return shape;
    }

    AX_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 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);
            AX_BREAK_IF(shape == nullptr);
            cpShapeSetUserData(shape, this);
            cpShapeSetElasticity(shape, 1.0f);
            cpShapeSetFriction(shape, 1.0f);
            addShape(shape);
        }
        AX_SAFE_DELETE_ARRAY(vec);
        AX_BREAK_IF(i < count - 1);

        _mass   = PHYSICS_INFINITY;
        _moment = PHYSICS_INFINITY;

        setMaterial(material);

        return true;
    } while (false);

    AX_SAFE_DELETE_ARRAY(vec);

    return false;
}

Vec2 PhysicsShapeEdgeChain::getCenter()
{
    int count      = (int)_cpShapes.size() + 1;
    cpVect* points = new cpVect[count];
    int i          = 0;
    for (auto&& shape : _cpShapes)
    {
        points[i++] = cpSegmentShapeGetA(shape);
    }

    points[i++] = cpSegmentShapeGetB(_cpShapes.back());

    Vec2 center = PhysicsHelper::cpv2vec2(cpCentroidForPoly(count, points));
    delete[] points;

    return center;
}

void PhysicsShapeEdgeChain::getPoints(Vec2* outPoints) const
{
    int i = 0;
    for (auto&& shape : _cpShapes)
    {
        outPoints[i++] = PhysicsHelper::cpv2vec2(cpSegmentShapeGetA(shape));
    }

    outPoints[i++] = PhysicsHelper::cpv2vec2(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::vec22cpv(point), nullptr) < 0)
        {
            return true;
        }
    }

    return false;
}

NS_AX_END

#endif  // AX_USE_PHYSICS