void Urho2DPhysicsRope::CreateScene()
{
scene_ = new Scene(context_);
scene_->CreateComponent<Octree>();
scene_->CreateComponent<DebugRenderer>();
// Create camera node
cameraNode_ = scene_->CreateChild("Camera");
// Set camera's position
cameraNode_->SetPosition(Vector3(0.0f, 5.0f, -10.0f));
Camera* camera = cameraNode_->CreateComponent<Camera>();
camera->SetOrthographic(true);
Graphics* graphics = GetSubsystem<Graphics>();
float width = (float)graphics->GetWidth();
float height = (float)graphics->GetHeight();
camera->SetOrthoSize(Vector2(width, height) * 0.05f);
// Create 2D physics world component
PhysicsWorld2D* physicsWorld = scene_->CreateComponent<PhysicsWorld2D>();
physicsWorld->SetDrawJoint(true);
// Create ground
Node* groundNode = scene_->CreateChild("Ground");
// Create 2D rigid body for gound
RigidBody2D* groundBody = groundNode->CreateComponent<RigidBody2D>();
// Create edge collider for ground
CollisionEdge2D* groundShape = groundNode->CreateComponent<CollisionEdge2D>();
groundShape->SetVertices(Vector2(-40.0f, 0.0f), Vector2(40.0f, 0.0f));
const float y = 15.0f;
RigidBody2D* prevBody = groundBody;
for (unsigned i = 0; i < NUM_OBJECTS; ++i)
{
Node* node = scene_->CreateChild("RigidBody");
// Create rigid body
RigidBody2D* body = node->CreateComponent<RigidBody2D>();
body->SetBodyType(BT_DYNAMIC);
// Create box
CollisionBox2D* box = node->CreateComponent<CollisionBox2D>();
// Set friction
box->SetFriction(0.2f);
// Set mask bits.
box->SetMaskBits(0xFFFF & ~0x0002);
if (i == NUM_OBJECTS - 1)
{
node->SetPosition(Vector3(1.0f * i, y, 0.0f));
body->SetAngularDamping(0.4f);
box->SetSize(3.0f, 3.0f);
box->SetDensity(100.0f);
box->SetCategoryBits(0x0002);
}
else
{
node->SetPosition(Vector3(0.5f + 1.0f * i, y, 0.0f));
box->SetSize(1.0f, 0.25f);
box->SetDensity(20.0f);
box->SetCategoryBits(0x0001);
}
ConstraintRevolute2D* joint = node->CreateComponent<ConstraintRevolute2D>();
joint->SetOtherBody(prevBody);
joint->SetAnchor(Vector2(float(i), y));
joint->SetCollideConnected(false);
prevBody = body;
}
ConstraintRope2D* constraintRope = groundNode->CreateComponent<ConstraintRope2D>();
constraintRope->SetOtherBody(prevBody);
constraintRope->SetOwnerBodyAnchor(Vector2(0.0f, y));
constraintRope->SetMaxLength(NUM_OBJECTS - 1.0f + 0.01f);
}
