bool Space::Update(Scene &scene, float dt) {
// Offset for UV mapping, creates illusion of scrolling
//offset -= dt/5;
GenerateModelMatrix();
return true;
}
bool Asteroid::Update(Scene &scene, float dt) {
// Count time alive
age += dt;
// Animate position according to time
position += speed * dt;
// Rotate the object
rotation += rotMomentum * dt;
// Delete when alive longer than 10s or out of visibility
if (age > 10.0f || position.y < -10) return false;
// Collide with scene
for (auto obj : scene.objects) {
// Ignore self in scene
if (obj.get() == this) continue;
// We only need to collide with asteroids and projectiles, ignore other objects
auto asteroid = std::dynamic_pointer_cast<Asteroid>(obj);
auto projectile = std::dynamic_pointer_cast<Projectile>(obj);
if (!asteroid && !projectile) continue;
// When colliding with other asteroids make sure the object is older than .5s
// This prevents excessive collisions when asteroids explode.
if (asteroid && age < 0.5f) continue;
// Compare distance to approximate size of the asteroid estimated from scale.
if (glm::distance(position, obj->position) < (obj->scale.y + scale.y)*0.7f) {
int pieces = 3;
// Too small to split into pieces
if (scale.y < 0.5) pieces = 0;
// The projectile will be destroyed
if (projectile) projectile->Destroy();
// Generate smaller asteroids
Explode(scene, (obj->position+position)/2.0f, (obj->scale+scale)/2.0f, pieces);
// Destroy self
return false;
}
}
// Generate modelMatrix from position, rotation and scale
GenerateModelMatrix();
return true;
}
bool Projectile::Update(Scene &scene, float dt) {
// Increase age
age += dt;
// Accelerate
speed += glm::vec3(0.0f, 0.2f, 0.0f);
rotation += rotMomentum;
// Move the projectile
position += speed * dt;
// Die after 5s
if (age > 5.0f) return false;
GenerateModelMatrix();
return true;
}
