Bullet::Bullet() : Object() {
shape = b2PolygonShape();
type = ObjectData::object_type::BULLET;
direction = Cell::Direction::NONE;
speed = 20.0f;
damage = 10;
}
void Box2DPhysicsComponent::createCollisionBody( b2World* physics, GameObject* object, b2BodyType type, bool sensorOnly )
{
// Create instances
mBodyDef = b2BodyDef();
mPolygonShape = b2PolygonShape();
mFixtureDef = b2FixtureDef();
// Set type
mBodyDef.type = type;
// Set position and create the body
mBodyDef.position.Set( object->getPosition().x / SCALE, object->getPosition().y / SCALE );
mBody = physics->CreateBody( &mBodyDef );
/*
* SHAPE
*
* Dynamic bodies get a standard polygon box shape.
*
* Static and kinematic bodies get a a rectangular shape made of
* egde chains (one per side; so four total) to fix the ghost vertices
* problem. This is done by defining previous and next vertices that
* Box2D can use in its calculation.
*
* More info:
* http://www.box2d.org/manual.html#_Toc258082970
* http://www.iforce2d.net/b2dtut/ghost-vertices
*
*/
if ( type != b2_dynamicBody )
{
// Top
b2Vec2 vs[2];
vs[0].Set( (-object->getSize().x / 2.f) / SCALE, -object->getSize().y / 2.f / SCALE );
vs[1].Set( (object->getSize().x / 2.f) / SCALE, -object->getSize().y / 2.f / SCALE );
mChainShape[0].CreateChain( vs, 2 );
mChainShape[0].SetPrevVertex( b2Vec2( (-object->getSize().x - object->getSize().x / 2.f) / SCALE, object->getSize().y / 2.f / SCALE ) );
mChainShape[0].SetNextVertex( b2Vec2( (object->getSize().x + object->getSize().x / 2.f) / SCALE, object->getSize().y / 2.f / SCALE ) );
mBody->CreateFixture( &mChainShape[0], 0.f );
// Bottom
vs[0].Set( (-object->getSize().x / 2.f) / SCALE, object->getSize().y / 2.f / SCALE );
vs[1].Set( (object->getSize().x / 2.f) / SCALE, object->getSize().y / 2.f / SCALE );
mChainShape[1].CreateChain( vs, 2 );
mChainShape[1].SetPrevVertex( b2Vec2( (-object->getSize().x - object->getSize().x / 2.f) / SCALE, object->getSize().y / 2.f / SCALE ) );
mChainShape[1].SetNextVertex( b2Vec2( (object->getSize().x + object->getSize().x / 2.f) / SCALE, object->getSize().y / 2.f / SCALE ) );
mBody->CreateFixture( &mChainShape[1], 0.f );
// Left
vs[0].Set( (-object->getSize().x / 2.f) / SCALE, -object->getSize().y / 2.f / SCALE );
vs[1].Set( (-object->getSize().x / 2.f) / SCALE, object->getSize().y / 2.f / SCALE );
mChainShape[2].CreateChain( vs, 2 );
mChainShape[2].SetPrevVertex( b2Vec2( -object->getSize().x / 2.f / SCALE, (-object->getSize().y - object->getSize().y / 2.f) / SCALE ) );
mChainShape[2].SetNextVertex( b2Vec2( -object->getSize().x / 2.f / SCALE, (object->getSize().y + object->getSize().y / 2.f) / SCALE ) );
mBody->CreateFixture( &mChainShape[2], 0.f );
// Right
vs[0].Set( (object->getSize().x / 2.f) / SCALE, -object->getSize().y / 2.f / SCALE );
vs[1].Set( (object->getSize().x / 2.f) / SCALE, object->getSize().y / 2.f / SCALE );
mChainShape[3].CreateChain( vs, 2 );
mChainShape[3].SetPrevVertex( b2Vec2( object->getSize().x / 2.f / SCALE, (-object->getSize().y - object->getSize().y / 2.f) / SCALE ) );
mChainShape[3].SetNextVertex( b2Vec2( object->getSize().x / 2.f / SCALE, (object->getSize().y + object->getSize().y / 2.f) / SCALE ) );
mBody->CreateFixture( &mChainShape[3], 0.f );
}
else
{
mPolygonShape.SetAsBox( (object->getSize().x / 2.f) / SCALE, (object->getSize().y / 2.f) / SCALE );
mFixtureDef.shape = &mPolygonShape;
mFixtureDef.density = 1.f;
mFixtureDef.friction = 1.0f;
if( sensorOnly )
{
mFixtureDef.isSensor = true;
}
mBody->CreateFixture( &mFixtureDef );
}
}
