/// <summary>
/// Allows the game to run logic such as updating the world,
/// checking for collisions, gathering input, and playing audio.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Update(GameTime gameTime)
{
// Pass keyboard state to Global so we can use it everywhere
Global.keys = Keyboard.GetState();
// Update the game objects
base.Update(gameTime);
foreach (GameObject GO in gameObjects)
{
GO.Update();
}
for (int i = 0; i < gameObjects.Count; i++)
{
for (int x = 0; x < gameObjects.Count; x++)
{
if (gameObjects[i] is Bullet)
{
Bullet B = gameObjects[i] as Bullet;
if (gameObjects[x] is Player)
{
Player P = gameObjects[x] as Player;
if (Global.keys.IsKeyDown(Keys.Space))
{
B.Fire(P.position);
}
}
else if (gameObjects[x] is Invader)
{
Invader I = gameObjects[x] as Invader;
if (B.overlaps(B.position.X, B.position.Y, B.texture, I.position.X, I.position.Y, I.texture))
{
B.Start();
I.Start();
}
}
else if (gameObjects[x] is Shield)
{
Shield S = gameObjects[x] as Shield;
if (B.overlaps(B.position.X, B.position.Y, B.texture, S.position.X, S.position.Y, S.texture))
{
B.Start();
gameObjects.RemoveAt(x);
}
}
else if (gameObjects[x] is SpaceShip)
{
SpaceShip SS = gameObjects[x] as SpaceShip;
if (B.overlaps(B.position.X, B.position.Y, B.texture, SS.position.X, SS.position.Y, SS.texture))
{
B.Start();
SS.hits++;
if (SS.hits >= 2)
{
gameObjects.RemoveAt(x);
}
}
}
}
}
}
}