void GameWorld::DoCollisionResponse(float dt)
{
// safe checking if the platform's fixture is deleted before this function is called
if(!platform_->GetBody()->GetFixtureList())
return;
// fetch the shape from the platform body's fixture
b2EdgeShape* platform_shape = (b2EdgeShape*)platform_->GetBody()->GetFixtureList()->GetShape();
// get the difference vector
b2Vec2 diff = platform_shape->m_vertex2 - platform_shape->m_vertex1;
// calculate magnitude of the impulse based on the length of the platform
float distance = WORLD_TO_SCREEN(diff.Length()) / MAX_PLATFORM_WIDTH;
float magnitude = PLATFORM_IMPULSE * (1.5f - (distance > 1.0f ? 1.0f : distance));
// impulse wil be in the direction of the contact normal
b2Vec2 impulse = contact_normal_;
// ensure impulse throws the clown up not down
impulse.y = impulse.y < 0 ? impulse.y * -1 : impulse.y;
impulse *= magnitude;
// apply a linear impulse to the center of the clown's body
clown_->GetBody()->ApplyLinearImpulse(impulse, clown_->GetBody()->GetWorldCenter());
// collision response finished, now remove the platform
RemovePlatform();
}
StarPhysicsNode::StarPhysicsNode(const char* f, CCPoint p, AroundMeLayer* layer)
: PhysicsNode(layer) {
m_image = QString(f);
b2BodyDef bd;
bd.type = b2_dynamicBody;
bd.position.Set(p.x / PTM_RATIO, p.y / PTM_RATIO);
bd.userData = this;
b2Body *body = m_world->CreateBody(&bd);
b2Vec2 vertices[3];
{
b2PolygonShape triangle;
vertices[0] = b2Vec2(-3.0f, 0.78f);
vertices[1] = b2Vec2(-1.98f, -0.84f);
vertices[2] = b2Vec2(-1.2f, 1.56f);
triangle.Set(vertices, 3);
b2FixtureDef fixtureDef;
fixtureDef.shape = ▵
fixtureDef.density = 1.0f;
fixtureDef.restitution = 0.5;
fixtureDef.friction = 0.3f;
fixtureDef.filter.categoryBits = CHEERIOS;
body->CreateFixture(&fixtureDef);
}
{
b2PolygonShape triangle;
vertices[0] = b2Vec2(-1.2f, 1.56f);
vertices[1] = b2Vec2(1.2f, 1.56f);
vertices[2] = b2Vec2(0.0f, 3.0f);
triangle.Set(vertices, 3);
b2FixtureDef fixtureDef;
fixtureDef.shape = ▵
fixtureDef.density = 1.0f;
fixtureDef.restitution = 0.5;
fixtureDef.friction = 0.3f;
fixtureDef.filter.categoryBits = CHEERIOS;
body->CreateFixture(&fixtureDef);
}
{
b2PolygonShape triangle;
vertices[0] = b2Vec2(1.2f, 1.56f);
vertices[1] = b2Vec2(1.98f, -0.84f);
vertices[2] = b2Vec2(3.0f, 0.78f);
triangle.Set(vertices, 3);
b2FixtureDef fixtureDef;
fixtureDef.shape = ▵
fixtureDef.density = 1.0f;
fixtureDef.restitution = 0.5;
fixtureDef.friction = 0.3f;
fixtureDef.filter.categoryBits = CHEERIOS;
body->CreateFixture(&fixtureDef);
}
{
b2PolygonShape triangle;
vertices[0] = b2Vec2(1.98f, -0.84f);
vertices[1] = b2Vec2(0.0f, -2.22f);
vertices[2] = b2Vec2(1.8f, -3.0f);
triangle.Set(vertices, 3);
b2FixtureDef fixtureDef;
fixtureDef.shape = ▵
fixtureDef.density = 1.0f;
fixtureDef.restitution = 0.5;
fixtureDef.friction = 0.3f;
fixtureDef.filter.categoryBits = CHEERIOS;
body->CreateFixture(&fixtureDef);
}
{
b2PolygonShape triangle;
vertices[0] = b2Vec2(0.0f, -2.22f);
vertices[1] = b2Vec2(-1.98f, -0.84f);
vertices[2] = b2Vec2(-1.8f, -3.0f);
triangle.Set(vertices, 3);
b2FixtureDef fixtureDef;
fixtureDef.shape = ▵
fixtureDef.density = 1.0f;
fixtureDef.restitution = 0.5;
fixtureDef.friction = 0.3f;
fixtureDef.filter.categoryBits = CHEERIOS;
body->CreateFixture(&fixtureDef);
}
{
b2Vec2 vertices[5];
b2PolygonShape pentagon;
vertices[0] = b2Vec2(-1.98f, -0.84f);
vertices[1] = b2Vec2(0.0f, -2.22f);
vertices[2] = b2Vec2(1.98f, -0.84f);
vertices[3] = b2Vec2(1.2f, 1.56f);
vertices[4] = b2Vec2(-1.2f, 1.56f);
pentagon.Set(vertices, 5);
b2FixtureDef fixtureDef;
fixtureDef.shape = &pentagon;
fixtureDef.density = 1.0f;
fixtureDef.restitution = 0.5;
fixtureDef.friction = 0.3f;
fixtureDef.filter.categoryBits = CHEERIOS;
body->CreateFixture(&fixtureDef);
}
setContentSize(CCSize(WORLD_TO_SCREEN(3*2), WORLD_TO_SCREEN(3*2)));
setScale(WORLD_TO_SCREEN(3) / 100);
setPosition(ccp(p.x, p.y));
setB2Body(body);
m_sprite = CCSprite::create(f);
addChild(m_sprite);
}
//============================================================================
void CPhysicsBody::InitialComponent(b2World *poWorld, b2Vec2 *poGravity, eShapeTypes eType, Point *poPosition,
eBodyTypes eBody, float sngScale, std::string strImage)
{ // Declare Variables
//--------------------------------------------------
m_poWorld = poWorld;
m_poGravity = poGravity;
m_poSprite = Sprite::create(strImage);
m_poSprite->setPosition(*poPosition);
m_poSprite->setScale(sngScale);
switch(eBody)
{
case STATIC_BODY:
m_oBodyDef.type = b2_staticBody;
break;
case DYNAMIC_BODY:
m_oBodyDef.type = b2_dynamicBody;
break;
case UN_ASSIGNED_BODY:
default:
m_oBodyDef.type = b2_staticBody;
break;
}
m_oBodyDef.position = b2Vec2(poPosition->x, poPosition->y);
m_oBodyDef.userData = m_poSprite;
m_poBody = m_poWorld->CreateBody(&m_oBodyDef);
switch(eType)
{
case CIRCLE_SHAPE:
{ // Configure Circle Object
//----------------------------------------------
b2CircleShape oCircle;
oCircle.m_radius = WORLD_TO_SCREEN(DEFAULT_RADIUS_VALUE);
m_oFixtureDef.shape = &oCircle;
m_poShape = &oCircle;
break;
}
case EDGE_SHAPE:
{ // Configure edge Object
//----------------------------------------------
b2EdgeShape oEdge;
oEdge.Set(b2Vec2(0,0), b2Vec2(WORLD_TO_SCREEN(DEFAULT_RADIUS_VALUE), 0));
m_oFixtureDef.shape = &oEdge;
m_poShape = &oEdge;
break;
}
case CHAIN_SHAPE:
{ // Configure chain Object
//----------------------------------------------
b2ChainShape oChain;
m_oFixtureDef.shape = &oChain;
m_poShape = &oChain;
break;
}
case POLYGON_SHAPE:
{ // Configure Polygon Object
//----------------------------------------------
b2PolygonShape oPolygon;
m_oFixtureDef.shape = &oPolygon;
m_poShape = &oPolygon;
break;
}
case UN_ASSIGNED_SHAPE:
default:
{ // Configure Default Object
//----------------------------------------------
b2PolygonShape oPolygon;
m_oFixtureDef.shape = &oPolygon;
m_poShape = &oPolygon;
break;
}
}
m_oFixtureDef.density = DEFAULT_DENSITY;
m_oFixtureDef.friction = DEFAULT_FICTION;
m_oFixtureDef.restitution = DEFAULT_RESTITUTION;
m_poBody->CreateFixture(&m_oFixtureDef);
//--------------------------------------------------
} // End of InitialComponent Method
