public IComponent Clone()
{
SpawnEntityComponent ret = new SpawnEntityComponent();
ret.Factory = Factory.Clone();
return ret;
}
//Note: timerPhaseAngle is expected to be in the interval [0, 1]
private void createPlayerGun(IEntityManager entityStore, Entity player, Entity bullet, float offsetProportion, float timerPhaseAngle)
{
//compute the gun's offset from the player, then create the gun
AABBComponent bulletBox = (AABBComponent)bullet.components[typeof(AABBComponent)];
AABBComponent playerBox = (AABBComponent)player.components[typeof(AABBComponent)];
Entity gun = createPositionSlavedEntity(player, new Vector2(playerBox.Width + 0.1f, playerBox.Height * offsetProportion - bulletBox.Height / 2.0f));
//The gun now has a position coupled to that of the player
//So spawn bullets at the gun!
SpawnEntityComponent spawner = new SpawnEntityComponent();
spawner.Factory = new ComposedEntityFactory(new List<IEntityFactory>() {
new CloneEntityFactory(bullet),
new InheritParentComponentEntityFactory(typeof(PositionComponent)) });
//Bullets should be spawned periodically
PeriodicAddComponentComponent timer = new PeriodicAddComponentComponent();
timer.Period = 200.0f;
timer.TimeSinceLastFiring = timer.Period * timerPhaseAngle;
timer.ComponentToAdd = spawner;
gun.AddComponent(timer);
//The gun should be removed from the world when the player dies
DestroyedOnParentDestroyedComponent existentialDependency = new DestroyedOnParentDestroyedComponent();
existentialDependency.parent = player;
gun.AddComponent(existentialDependency);
//finally, add the gun to the world
entityStore.Add(gun);
}
private Entity createMineTemplateEntity(Game game)
{
Entity mineTemplate = new Entity();
//Component: Damage the player.
DamageOnContactComponent damage = new DamageOnContactComponent();
damage.Damage = 10;
mineTemplate.AddComponent(damage);
//Component: Has health
HealthComponent health = new HealthComponent();
health.Health = 10;
mineTemplate.AddComponent(health);
//Component: Has a texture
TextureComponent tex = new TextureComponent();
tex.Texture = game.Content.Load<Texture2D>("spaceArt/png/meteorBig");
tex.SourceRect = tex.Texture.Bounds;
mineTemplate.AddComponent(tex);
//Component: Has a position.
PositionComponent pos = new PositionComponent();
pos.Position.X = game.GraphicsDevice.Viewport.Width - 1;
pos.Position.Y = game.GraphicsDevice.Viewport.Height / 2 - tex.SourceRect.Height / 2;
pos.Rotation = Math.PI / 4;
mineTemplate.AddComponent(pos);
//Component: Given a random starting vertical position
RandomPositionOffsetComponent randomOffset = new RandomPositionOffsetComponent();
randomOffset.Minimum = new Vector2(0.0f, -0.4f * game.GraphicsDevice.Viewport.Height);
randomOffset.Maximum = new Vector2(0.0f, 0.4f * game.GraphicsDevice.Viewport.Height);
mineTemplate.AddComponent(randomOffset);
//Component: Moves linearly, continuously rotates
LinearMovementComponent movement = new LinearMovementComponent();
movement.RotationRate = 0.01f;
mineTemplate.AddComponent(movement);
//Component: Moves at constant speed
MoveSpeedComponent speed = new MoveSpeedComponent();
speed.MoveSpeed = -10;
mineTemplate.AddComponent(speed);
//Component: Has a bounding box
AABBComponent aabb = new AABBComponent();
aabb.Height = tex.SourceRect.Height;
aabb.Width = tex.SourceRect.Width;
mineTemplate.AddComponent(aabb);
//Component: Is rendered at a specific layer - just above the player
RenderLayerComponent layer = new RenderLayerComponent();
layer.LayerID = 11;
mineTemplate.AddComponent(layer);
//Component: Is destroyed when it ventures off the (left side of the) screen
DestroyedWhenOffScreenComponent destroyer = new DestroyedWhenOffScreenComponent();
mineTemplate.AddComponent(destroyer);
//Component: Has a score value
// TODO this is more complex than the other ones, involves the changing of global state!
//Component: Is destroyed when it runs out of health
DestroyedWhenNoHealthComponent destroyer2 = new DestroyedWhenNoHealthComponent();
mineTemplate.AddComponent(destroyer2);
//Component: Leaves behind an explosion entity when it is destroyed
AddComponentOnDestructionComponent explosionSpawnTriggerer = new AddComponentOnDestructionComponent();
SpawnEntityComponent explosionSpawner = new SpawnEntityComponent();
explosionSpawner.Factory = new ComposedEntityFactory(new List<IEntityFactory>() {
new CloneEntityFactory(createExplosionEntity(game, aabb)),
new InheritParentComponentEntityFactory(typeof(PositionComponent)) });
explosionSpawnTriggerer.ToAdd = explosionSpawner;
mineTemplate.AddComponent(explosionSpawnTriggerer);
return mineTemplate;
}
private void initializeMinefield(IEntityManager entityStore, Game game)
{
//Create a mine-spawning entity that spawns mines in random positions every once in a while
Entity minespawner = new Entity();
//Component: Spawn an entity
SpawnEntityComponent spawnComponent = new SpawnEntityComponent();
spawnComponent.Factory = createAsteroidFactory(game);
//Component: Periodically add a spawn entity component
PeriodicAddComponentComponent timer = new PeriodicAddComponentComponent();
timer.ComponentToAdd = spawnComponent;
timer.Period = 500;
timer.TimeSinceLastFiring = 0.0f;
minespawner.AddComponent(timer);
//Add the minefield to the entity store
entityStore.Add(minespawner);
}
