Now that we have walls, let's create our first GameObject class that will represent the base platform. When I say base platform, I mean the trampoline the clown will be trying relentlessly to jump off at the start of the game. We define the CreateBasePlatform function in GameWorld.cpp:
void GameWorld::CreateBasePlatform()
{
// base platform will be a static body
b2BodyDef platform_def;
platform_def.position.Set(SCREEN_TO_WORLD(416),
SCREEN_TO_WORLD(172));
b2Body* base_platform_body = world_->CreateBody(&platform_def);
// create an edge slightly above the bottom of the screen
b2EdgeShape base_platform_shape;
base_platform_shape.Set(b2Vec2(SCREEN_TO_WORLD(-SCREEN_SIZE.width),
0.45f), b2Vec2(SCREEN_TO_WORLD(SCREEN_SIZE.width), 0.45f));
b2FixtureDef base_platform_fixture_def;
base_platform_fixture_def.shape = &base_platform_shape;
// give the base platform perfectly elastic collision response
base_platform_fixture_def.restitution ...