GDevelop/Extensions/PhysicsBehavior/PhysicsBehavior.cpp

/**

GDevelop - Physics Behavior Extension
Copyright (c) 2010-2015 Florian Rival (Florian.Rival@gmail.com)
This project is released under the MIT License.
*/

#include "PhysicsBehavior.h"
#include <string>
#include "Box2D/Box2D.h"
#include "Triangulation/triangulate.h"
#include "GDCpp/RuntimeScene.h"
#include "GDCpp/Serialization/SerializerElement.h"
#include "PhysicsBehaviorEditor.h"
#include "GDCpp/CommonTools.h"
#include "GDCpp/RuntimeObject.h"
#include "GDCpp/Project/Project.h"
#include "GDCpp/Project/Layout.h"
#include "RuntimeScenePhysicsDatas.h"

#undef GetObject

PhysicsBehavior::PhysicsBehavior() :
    Behavior(),
    shapeType(Box),
    dynamic(true),
    fixedRotation(false),
    isBullet(false),
    massDensity(1),
    averageFriction(0.8),
    averageRestitution(0),
    linearDamping(0.1),
    angularDamping(0.1),
    body(NULL),
    runtimeScenesPhysicsDatas(NULL)
{
    polygonHeight = 200;
    polygonWidth = 200;
    automaticResizing = false;
    polygonPositioning = OnCenter;
    polygonScaleX = 1;
    polygonScaleY = 1;
}

PhysicsBehavior::~PhysicsBehavior()
{
    if ( runtimeScenesPhysicsDatas != NULL && body)
        runtimeScenesPhysicsDatas->world->DestroyBody(body);
}

#if defined(GD_IDE_ONLY)
void PhysicsBehavior::EditBehavior( wxWindow* parent, gd::Project & project_, gd::Layout * layout_, gd::MainFrameWrapper & mainFrameWrapper_ )
{
#if !defined(GD_NO_WX_GUI)
    PhysicsBehaviorEditor editor(parent, project_, layout_, *this, mainFrameWrapper_);
    editor.ShowModal();
#endif
}
#endif

/**
 * Called at each frame before events :
 * Simulate the world if necessary and update body positions.
 */
void PhysicsBehavior::DoStepPreEvents(RuntimeScene & scene)
{
    if ( !body ) CreateBody(scene);

    if ( !runtimeScenesPhysicsDatas->stepped ) //Simulate the world, once at each frame
    {
        runtimeScenesPhysicsDatas->StepWorld(static_cast<double>(scene.GetTimeManager().GetElapsedTime())
            / 1000000.0, 6, 10);
        runtimeScenesPhysicsDatas->stepped = true;
    }

    //Update object position according to Box2D body
    b2Vec2 position = body->GetPosition();
    object->SetX(position.x*runtimeScenesPhysicsDatas->GetScaleX()-object->GetWidth()/2+object->GetX()-object->GetDrawableX());
    object->SetY(-position.y*runtimeScenesPhysicsDatas->GetScaleY()-object->GetHeight()/2+object->GetY()-object->GetDrawableY()); //Y axis is inverted
    object->SetAngle(-body->GetAngle()*180.0f/b2_pi); //Angles are inverted

    objectOldX = object->GetX();
    objectOldY = object->GetY();
    objectOldAngle = object->GetAngle();
};

/**
 * Called at each frame after events :
 * Update Box2D body if necessary
 */
void PhysicsBehavior::DoStepPostEvents(RuntimeScene & scene)
{
    if ( !body ) CreateBody(scene);

    //Note: Strange bug here, using SpriteObject, the tests objectOldWidth != newWidth
    //and objectOldHeight != newHeight keeps being true even if the two values were exactly the same.
    //Maybe a floating point round error ( the values were integer yet in my tests! ) so we cast the values
    //to int to ensure that the body is not continuously recreated.
    float newWidth = object->GetWidth();
    float newHeight = object->GetHeight();
    if ( (int)objectOldWidth != (int)newWidth || (int)objectOldHeight != (int)newHeight )
    {
        /*std::cout << "Changed:" << (int)objectOldWidth << "!=" << (int)newWidth << std::endl;
        std::cout << "Changed:" << (int)objectOldHeight << "!=" << (int)newHeight << std::endl;
        std::cout << "( Object name:" << object->GetName() << std::endl;*/

        double oldAngularVelocity = body->GetAngularVelocity();
        b2Vec2 oldVelocity = body->GetLinearVelocity();

        runtimeScenesPhysicsDatas->world->DestroyBody(body);
        CreateBody(scene);

        body->SetAngularVelocity(oldAngularVelocity);
        body->SetLinearVelocity(oldVelocity);
    }

    runtimeScenesPhysicsDatas->stepped = false; //Prepare for a new simulation

    if ( objectOldX == object->GetX() && objectOldY == object->GetY() && objectOldAngle == object->GetAngle())
        return;

    b2Vec2 oldPos;
    oldPos.x = (object->GetDrawableX()+object->GetWidth()/2)*runtimeScenesPhysicsDatas->GetInvScaleX();
    oldPos.y = -(object->GetDrawableY()+object->GetHeight()/2)*runtimeScenesPhysicsDatas->GetInvScaleY(); //Y axis is inverted
    body->SetTransform(oldPos, -object->GetAngle()*b2_pi/180.0f); //Angles are inverted
    body->SetAwake(true);
}

/**
 * Prepare Box2D body, and set up also runtimeScenePhysicsDatasPtr.
 */
void PhysicsBehavior::CreateBody(const RuntimeScene & scene)
{
    if ( runtimeScenesPhysicsDatas == NULL )
        runtimeScenesPhysicsDatas = static_cast<RuntimeScenePhysicsDatas*>(scene.GetBehaviorSharedData(name).get());

    //Create body from object
    b2BodyDef bodyDef;
    bodyDef.type = dynamic ? b2_dynamicBody : b2_staticBody;
    bodyDef.position.Set((object->GetDrawableX()+object->GetWidth()/2)*runtimeScenesPhysicsDatas->GetInvScaleX(), -(object->GetDrawableY()+object->GetHeight()/2)*runtimeScenesPhysicsDatas->GetInvScaleY());
    bodyDef.angle = -object->GetAngle()*b2_pi/180.0f; //Angles are inverted
    bodyDef.angularDamping = angularDamping > 0.0f ? angularDamping : 0.0f;
    bodyDef.linearDamping = linearDamping > 0.0f ? linearDamping : 0.0f;
    bodyDef.bullet = isBullet;
    bodyDef.fixedRotation = fixedRotation;
    body = runtimeScenesPhysicsDatas->world->CreateBody(&bodyDef);
    body->SetUserData(this);

    //Setup body
    if ( shapeType == Circle)
    {
        b2FixtureDef fixtureDef;

        b2CircleShape circle;
        circle.m_radius = (object->GetWidth()*runtimeScenesPhysicsDatas->GetInvScaleX()+
                           object->GetHeight()*runtimeScenesPhysicsDatas->GetInvScaleY())/4; //Radius is based on the average of height and width
        if ( circle.m_radius <= 0 ) circle.m_radius = 1;
        fixtureDef.shape = &circle;
        fixtureDef.density = massDensity;
        fixtureDef.friction = averageFriction;
        fixtureDef.restitution = averageRestitution;

        body->CreateFixture(&fixtureDef);
    }
    else if( shapeType == CustomPolygon && polygonCoords.size() > 2)
    {
        //Make a polygon triangulation to make possible to use a concave polygon and more than 8 edged polygons
        std::vector<sf::Vector2f> resultOfTriangulation;

        Triangulate::Process(polygonCoords, resultOfTriangulation);

        //Iterate over all triangles
        for(std::size_t i = 0; i < resultOfTriangulation.size() / 3; i++)
        {
            b2FixtureDef fixtureDef;
            b2PolygonShape dynamicBox;

            //Create vertices
            b2Vec2 vertices[3];

            std::size_t b = 0;
            for(int a = 2; a >= 0; a--) //Box2D use another direction for vertices
            {
                if(polygonPositioning == OnOrigin)
                {
                    vertices[b].Set((resultOfTriangulation.at(i*3 + a).x * GetPolygonScaleX() - object->GetWidth()/2 - (object->GetDrawableX() - object->GetX()))                                                * runtimeScenesPhysicsDatas->GetInvScaleX(),
                                    (((object->GetHeight() - (resultOfTriangulation.at(i*3 + a).y * GetPolygonScaleY())) - object->GetHeight()/2  + (object->GetDrawableY() - object->GetY()))                   * runtimeScenesPhysicsDatas->GetInvScaleY()));
                }
                /*else if(polygonPositioning == OnTopLeftCorner)
                {
                    vertices[b].Set((resultOfTriangulation.at(i*3 + a).x * GetPolygonScaleX() - object->GetWidth()/2 )                                              * runtimeScenesPhysicsDatas->GetInvScaleX(),
                                    (((object->GetHeight() - (resultOfTriangulation.at(i*3 + a).y * GetPolygonScaleY())) - object->GetHeight()/2)                   * runtimeScenesPhysicsDatas->GetInvScaleY()));
                }*/
                else if(polygonPositioning == OnCenter)
                {
                    vertices[b].Set((resultOfTriangulation.at(i*3 + a).x * GetPolygonScaleX())                                                                       * runtimeScenesPhysicsDatas->GetInvScaleX(),
                                    (((object->GetHeight() - (resultOfTriangulation.at(i*3 + a).y * GetPolygonScaleY())) - object->GetHeight())                      * runtimeScenesPhysicsDatas->GetInvScaleY()));
                }

                b++;
            }

            dynamicBox.Set(vertices, 3);

            fixtureDef.shape = &dynamicBox;
            fixtureDef.density = massDensity;
            fixtureDef.friction = averageFriction;
            fixtureDef.restitution = averageRestitution;

            body->CreateFixture(&fixtureDef);
        }
    }
    else
    {
        b2FixtureDef fixtureDef;

        b2PolygonShape dynamicBox;
        dynamicBox.SetAsBox((object->GetWidth() > 0 ? object->GetWidth() : 1.0f)*runtimeScenesPhysicsDatas->GetInvScaleX()/2,
            (object->GetHeight() > 0 ? object->GetHeight() : 1.0f)*runtimeScenesPhysicsDatas->GetInvScaleY()/2);
        fixtureDef.shape = &dynamicBox;
        fixtureDef.density = massDensity;
        fixtureDef.friction = averageFriction;
        fixtureDef.restitution = averageRestitution;

        body->CreateFixture(&fixtureDef);
    }

    objectOldWidth = object->GetWidth();
    objectOldHeight = object->GetHeight();
}

void PhysicsBehavior::OnDeActivate()
{
    if ( runtimeScenesPhysicsDatas && body )
    {
        runtimeScenesPhysicsDatas->world->DestroyBody(body);
        body = NULL; //Of course: body can ( and will ) be reused: Make sure we nullify the pointer as the body was destroyed.
    }
}

/**
 * Set a body to be static
 */
void PhysicsBehavior::SetStatic(RuntimeScene & scene)
{
    dynamic = false;

    if ( !body ) CreateBody(scene);
    body->SetType(b2_staticBody);
}

/**
 * Set a body to be dynamic
 */
void PhysicsBehavior::SetDynamic(RuntimeScene & scene)
{
    dynamic = true;

    if ( !body ) CreateBody(scene);
    body->SetType(b2_dynamicBody);
    body->SetAwake(true);
}

/**
 * Set rotation to be fixed
 */
void PhysicsBehavior::SetFixedRotation(RuntimeScene & scene)
{
    fixedRotation = true;

    if ( !body ) CreateBody(scene);
    body->SetFixedRotation(true);
}

/**
 * Set rotation to be free
 */
void PhysicsBehavior::SetFreeRotation(RuntimeScene & scene)
{
    fixedRotation = false;

    if ( !body ) CreateBody(scene);
    body->SetFixedRotation(false);
}

/**
 * Consider object as bullet, for better collision handling
 */
void PhysicsBehavior::SetAsBullet(RuntimeScene & scene)
{
    isBullet = true;

    if ( !body ) CreateBody(scene);
    body->SetBullet(true);
}

/**
 * Don't consider object as bullet, for faster collision handling
 */
void PhysicsBehavior::DontSetAsBullet(RuntimeScene & scene)
{
    isBullet = false;

    if ( !body ) CreateBody(scene);
    body->SetBullet(false);
}

/**
 * Apply an impulse
 */
void PhysicsBehavior::ApplyImpulse(double xCoordinate, double yCoordinate, RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);
    body->ApplyLinearImpulse(b2Vec2(xCoordinate, -yCoordinate),body->GetPosition());
}

/**
 * Apply a impulse
 */
void PhysicsBehavior::ApplyImpulseUsingPolarCoordinates( float angle, float length, RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);
    body->ApplyLinearImpulse(b2Vec2(cos(angle*b2_pi/180.0f)*length,-sin(angle*b2_pi/180.0f)*length), body->GetPosition());
}

/**
 * Apply a impulse
 */
void PhysicsBehavior::ApplyImpulseTowardPosition(float xPosition, float yPosition, float length, RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);

    float angle = atan2(yPosition*runtimeScenesPhysicsDatas->GetInvScaleY()+body->GetPosition().y,
                        xPosition*runtimeScenesPhysicsDatas->GetInvScaleX()-body->GetPosition().x);

    body->ApplyLinearImpulse(b2Vec2(cos(angle)*length, -sin(angle)*length), body->GetPosition());
}

/**
 * Apply a force
 */
void PhysicsBehavior::ApplyForce(double xCoordinate, double yCoordinate, RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);
    body->ApplyForce(b2Vec2(xCoordinate, -yCoordinate),body->GetPosition());
}

/**
 * Apply a force
 */
void PhysicsBehavior::ApplyForceUsingPolarCoordinates( float angle, float length, RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);
    body->ApplyForce(b2Vec2(cos(angle*b2_pi/180.0f)*length,-sin(angle*b2_pi/180.0f)*length), body->GetPosition());
}

/**
 * Apply a force
 */
void PhysicsBehavior::ApplyForceTowardPosition(float xPosition, float yPosition, float length, RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);

    float angle = atan2(yPosition*runtimeScenesPhysicsDatas->GetInvScaleY()+body->GetPosition().y,
                        xPosition*runtimeScenesPhysicsDatas->GetInvScaleX()-body->GetPosition().x);

    body->ApplyForce(b2Vec2(cos(angle)*length, -sin(angle)*length), body->GetPosition());
}

/**
 * Apply a torque
 */
void PhysicsBehavior::ApplyTorque( double torque, RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);
    body->ApplyTorque(torque);
}

/**
 * Change linear velocity
 */
void PhysicsBehavior::SetLinearVelocity( double xVelocity, double yVelocity, RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);
    body->SetLinearVelocity(b2Vec2(xVelocity,-yVelocity));
}

/**
 * Change angular velocity
 */
void PhysicsBehavior::SetAngularVelocity( double angularVelocity, RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);
    body->SetAngularVelocity(angularVelocity);
}

/**
 * Change linear damping
 */
void PhysicsBehavior::SetLinearDamping( float linearDamping_ , RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);
    body->SetLinearDamping(linearDamping_);
}

/**
 * Change angular damping
 */
void PhysicsBehavior::SetAngularDamping( float angularDamping_ , RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);
    body->SetAngularDamping(angularDamping_);
}

/**
 * Add an hinge between two objects
 */
void PhysicsBehavior::AddRevoluteJointBetweenObjects( RuntimeObject * object, RuntimeScene & scene, float xPosRelativeToMassCenter, float yPosRelativeToMassCenter )
{
    if ( !body ) CreateBody(scene);

    if ( object == NULL || !object->HasBehaviorNamed(name) ) return;
    b2Body * otherBody = static_cast<PhysicsBehavior*>(object->GetBehaviorRawPointer(name))->GetBox2DBody(scene);

    if ( body == otherBody ) return;

    b2RevoluteJointDef jointDef;
    jointDef.Initialize(body,
                        otherBody,
                        body->GetWorldCenter()+b2Vec2(xPosRelativeToMassCenter*runtimeScenesPhysicsDatas->GetInvScaleX(),
                                                      yPosRelativeToMassCenter*runtimeScenesPhysicsDatas->GetInvScaleY()));
    runtimeScenesPhysicsDatas->world->CreateJoint(&jointDef);
}


/**
 * Add an hinge to an object
 */
void PhysicsBehavior::AddRevoluteJoint( float xPosition, float yPosition, RuntimeScene & scene)
{
    if ( !body ) CreateBody(scene);

    b2RevoluteJointDef jointDef;
    jointDef.Initialize(body, runtimeScenesPhysicsDatas->staticBody,
                        b2Vec2( xPosition*runtimeScenesPhysicsDatas->GetInvScaleX(), -yPosition*runtimeScenesPhysicsDatas->GetInvScaleY()));

    runtimeScenesPhysicsDatas->world->CreateJoint(&jointDef);
}


/**
 * Change gravity
 */
void PhysicsBehavior::SetGravity( float xGravity, float yGravity, RuntimeScene & scene)
{
    if ( !body ) CreateBody(scene);

    runtimeScenesPhysicsDatas->world->SetGravity(b2Vec2(xGravity, -yGravity));
}


/**
 * Add a gear joint between two objects
 */
void PhysicsBehavior::AddGearJointBetweenObjects( RuntimeObject * object, float ratio, RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);

    if ( object == NULL || !object->HasBehaviorNamed(name) ) return;
    b2Body * otherBody = static_cast<PhysicsBehavior*>(object->GetBehaviorRawPointer(name))->GetBox2DBody(scene);

    if ( body == otherBody ) return;

    //Gear joint need a revolute joint to the ground for the two objects
    b2RevoluteJointDef jointDef1;
    jointDef1.Initialize(runtimeScenesPhysicsDatas->staticBody, body, body->GetWorldCenter());

    b2RevoluteJointDef jointDef2;
    jointDef2.Initialize(runtimeScenesPhysicsDatas->staticBody, otherBody, otherBody->GetWorldCenter());

    b2GearJointDef jointDef;
    jointDef.bodyA = body;
    jointDef.bodyB = otherBody;
    jointDef.joint1 = runtimeScenesPhysicsDatas->world->CreateJoint(&jointDef1);
    jointDef.joint2 = runtimeScenesPhysicsDatas->world->CreateJoint(&jointDef2);
    jointDef.ratio = ratio * b2_pi;


    runtimeScenesPhysicsDatas->world->CreateJoint(&jointDef);
}

void PhysicsBehavior::SetLinearVelocityX( double xVelocity, RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);

    body->SetLinearVelocity(b2Vec2(xVelocity, body->GetLinearVelocity().y));

}
void PhysicsBehavior::SetLinearVelocityY( double yVelocity, RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);

    body->SetLinearVelocity(b2Vec2(body->GetLinearVelocity().x, -yVelocity));

}
float PhysicsBehavior::GetLinearVelocityX( RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);

    return body->GetLinearVelocity().x;
}
float PhysicsBehavior::GetLinearVelocityY( RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);

    return -body->GetLinearVelocity().y;
}
float PhysicsBehavior::GetLinearVelocity( RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);

    return sqrt(body->GetLinearVelocity().x*body->GetLinearVelocity().x+body->GetLinearVelocity().y*body->GetLinearVelocity().y);
}
double PhysicsBehavior::GetAngularVelocity( const RuntimeScene & scene )
{
    if ( !body ) CreateBody(scene);

    return body->GetAngularVelocity();
}
double PhysicsBehavior::GetLinearDamping( const RuntimeScene & scene)
{
    if ( !body ) CreateBody(scene);

    return body->GetLinearDamping();
}
double PhysicsBehavior::GetAngularDamping( const RuntimeScene & scene)
{
    if ( !body ) CreateBody(scene);

    return body->GetAngularDamping();
}

/**
 * Test if there is a contact with another object
 */
bool PhysicsBehavior::CollisionWith( std::map <gd::String, std::vector<RuntimeObject*> *> otherObjectsLists, RuntimeScene & scene)
{
    if ( !body ) CreateBody(scene);

    //Getting a list of all objects which are tested
    std::vector<RuntimeObject*> objects;
    for (std::map <gd::String, std::vector<RuntimeObject*> *>::const_iterator it = otherObjectsLists.begin();it!=otherObjectsLists.end();++it)
    {
        if ( it->second != NULL )
        {
            objects.reserve(objects.size()+it->second->size());
            std::copy(it->second->begin(), it->second->end(), std::back_inserter(objects));
        }
    }

    //Test if an object of the list is in collision with our object.
	std::vector<RuntimeObject*>::const_iterator obj_end = objects.end();
    for (std::vector<RuntimeObject*>::iterator obj = objects.begin(); obj != obj_end; ++obj )
    {
        std::set<PhysicsBehavior*>::const_iterator it = currentContacts.begin();
        std::set<PhysicsBehavior*>::const_iterator end = currentContacts.end();
        for (;it != end;++it)
        {
            if ( (*it)->GetObject() == (*obj) )
                return true;
        }
    }

    return false;
}

bool PhysicsBehavior::IsStatic()
{
    return !dynamic;
}

bool PhysicsBehavior::IsDynamic()
{
    return dynamic;
}

void PhysicsBehavior::SetPolygonCoords(const std::vector<sf::Vector2f> &vec)
{
    polygonCoords = vec;
}

const std::vector<sf::Vector2f>& PhysicsBehavior::GetPolygonCoords() const
{
    return polygonCoords;
}

bool PhysicsBehavior::HasAutomaticResizing() const
{
    return automaticResizing;
}

void PhysicsBehavior::SetAutomaticResizing(bool b)
{
    automaticResizing = b;
}

float PhysicsBehavior::GetPolygonScaleX() const
{
    if(automaticResizing)
        return object->GetWidth() / polygonWidth;
    else
        return polygonScaleX;
}

void PhysicsBehavior::SetPolygonScaleX(float scX, RuntimeScene &scene)
{
    polygonScaleX = scX;

    runtimeScenesPhysicsDatas->world->DestroyBody(body);
    CreateBody(scene);
}

float PhysicsBehavior::GetPolygonScaleY() const
{
    if(automaticResizing)
        return object->GetHeight() / polygonHeight;
    else
        return polygonScaleY;
}

void PhysicsBehavior::SetPolygonScaleY(float scY, RuntimeScene &scene)
{
    polygonScaleY = scY;

    runtimeScenesPhysicsDatas->world->DestroyBody(body);
    CreateBody(scene);
}

#if defined(GD_IDE_ONLY)
void PhysicsBehavior::SerializeTo(gd::SerializerElement & element) const
{
    element.SetAttribute("dynamic", dynamic);
    element.SetAttribute("fixedRotation", fixedRotation);
    element.SetAttribute("isBullet", isBullet);
    element.SetAttribute("massDensity", massDensity);
    element.SetAttribute("averageFriction", averageFriction);
    element.SetAttribute("linearDamping", linearDamping);
    element.SetAttribute("angularDamping", angularDamping);
    if ( shapeType == Circle)
        element.SetAttribute("shapeType", "Circle");
    else if( shapeType == CustomPolygon )
        element.SetAttribute("shapeType", "CustomPolygon");
    else
        element.SetAttribute("shapeType", "Box");

    if ( polygonPositioning == OnOrigin )
        element.SetAttribute("positioning", "OnOrigin");
    else
        element.SetAttribute("positioning", "OnCenter");

    element.SetAttribute("autoResizing", automaticResizing);
    element.SetAttribute("polygonWidth", polygonWidth);
    element.SetAttribute("polygonHeight", polygonHeight);

    element.SetAttribute("coordsList", PhysicsBehavior::GetStringFromCoordsVector(GetPolygonCoords(), '/', ';'));
    element.SetAttribute("averageRestitution", averageRestitution);
}
#endif

void PhysicsBehavior::UnserializeFrom(const gd::SerializerElement & element)
{
    dynamic = element.GetBoolAttribute("dynamic");
    fixedRotation = element.GetBoolAttribute("fixedRotation");
    isBullet = element.GetBoolAttribute("isBullet");
    massDensity = element.GetDoubleAttribute("massDensity");
    averageFriction = element.GetDoubleAttribute("averageFriction");
    averageRestitution = element.GetDoubleAttribute("averageRestitution");

    linearDamping = element.GetDoubleAttribute("linearDamping");
    angularDamping = element.GetDoubleAttribute("angularDamping");

    gd::String shape = element.GetStringAttribute("shapeType");
    if ( shape == "Circle" )
        shapeType = Circle;
    else if (shape == "CustomPolygon")
        shapeType = CustomPolygon;
    else
        shapeType = Box;

    if(element.GetStringAttribute("positioning", "OnOrigin") == "OnOrigin")
        polygonPositioning = OnOrigin;
    else
        polygonPositioning = OnCenter;

    automaticResizing = element.GetBoolAttribute("autoResizing", false);
    polygonWidth = element.GetDoubleAttribute("polygonWidth");
    polygonHeight = element.GetDoubleAttribute("polygonHeight");

    gd::String coordsStr = element.GetStringAttribute("coordsList");
    SetPolygonCoords(PhysicsBehavior::GetCoordsVectorFromString(coordsStr, '/', ';'));
}


gd::String PhysicsBehavior::GetStringFromCoordsVector(const std::vector<sf::Vector2f> &vec, char32_t coordsSep, char32_t composantSep)
{
    gd::String coordsStr;

	for (std::size_t a = 0; a < vec.size(); a++)
	{
	    coordsStr += gd::String::From(vec.at(a).x);
        coordsStr.push_back(composantSep);
        coordsStr += gd::String::From(vec.at(a).y);
	    if(a != vec.size() - 1)
            coordsStr.push_back(coordsSep);
	}

	return coordsStr;
}

std::vector<sf::Vector2f> PhysicsBehavior::GetCoordsVectorFromString(const gd::String &str, char32_t coordsSep, char32_t composantSep)
{
    std::vector<sf::Vector2f> coordsVec;

    std::vector<gd::String> coordsDecomposed = str.Split(coordsSep);

    for(std::size_t a = 0; a < coordsDecomposed.size(); a++)
    {
        std::vector<gd::String> coordXY = coordsDecomposed.at(a).Split(composantSep);

        if(coordXY.size() != 2)
            continue;

        sf::Vector2f newCoord(coordXY.at(0).To<float>(), coordXY.at(1).To<float>());
        coordsVec.push_back(newCoord);
    }

    return coordsVec;
}