/// <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)
{
if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
{
Exit();
}
// get current mouse state and update burger
KeyboardState currentState = Keyboard.GetState();
if (burger.getHealth() > 0)
{
burger.Update(gameTime, currentState);
}
// update other game objects
foreach (TeddyBear bear in bears)
{
bear.Update(gameTime);
}
foreach (Projectile projectile in projectiles)
{
projectile.Update(gameTime);
}
foreach (Explosion explosion in explosions)
{
explosion.Update(gameTime);
}
// check and resolve collisions between teddy bears
foreach (TeddyBear bear in bears)
{
foreach (Projectile projectile in projectiles)
{
if ((bear.CollisionRectangle.X + bear.CollisionRectangle.Size.X > projectile.CollisionRectangle.X) && (bear.CollisionRectangle.X < projectile.CollisionRectangle.X) && (bear.CollisionRectangle.Y <= projectile.CollisionRectangle.Y) && (bear.CollisionRectangle.Y + bear.CollisionRectangle.Size.Y > projectile.CollisionRectangle.Y))
{
if (projectile.Type == ProjectileType.FrenchFries)
{
bear.Active = false;
projectile.Active = false;
Explosion newExplosion = new Explosion(explosionSpriteStrip, bear.CollisionRectangle.X, bear.CollisionRectangle.Y, explosion);
explosions.Add(newExplosion);
score += GameConstants.BearPoints;
scoreString = GameConstants.ScorePrefix + score;
}
}
}
if (bear.Active && ((bear.CollisionRectangle.X + bear.CollisionRectangle.Size.X > burger.CollisionRectangle.X) && (bear.CollisionRectangle.X < burger.CollisionRectangle.X) && (bear.CollisionRectangle.Y <= burger.CollisionRectangle.Y) && (bear.CollisionRectangle.Y + bear.CollisionRectangle.Size.Y > burger.CollisionRectangle.Y)))
{
burger.setHealth(burger.getHealth() - GameConstants.BearDamage);
bear.Active = false;
Explosion bearExploded = new Explosion(explosionSpriteStrip, bear.CollisionRectangle.X, bear.CollisionRectangle.Y, explosion);
explosions.Add(bearExploded);
healthString = GameConstants.HealthPrefix + burger.getHealth();
burgerDamage.Play();
CheckBurgerKill();
}
}
for (int i = explosions.Count - 1; i > 0; i--)
{
if (explosions[i].Finished)
{
explosions.RemoveAt(i);
}
}
// check and resolve collisions between burger and teddy bears
// check and resolve collisions between burger and projectiles
foreach (Projectile bearShot in projectiles)
{
if ((bearShot.Type == ProjectileType.TeddyBear) && (burger.CollisionRectangle.X + burger.CollisionRectangle.Size.X > bearShot.CollisionRectangle.X) && (burger.CollisionRectangle.X < bearShot.CollisionRectangle.X) && (burger.CollisionRectangle.Y <= bearShot.CollisionRectangle.Y) && (burger.CollisionRectangle.Y + burger.CollisionRectangle.Size.Y > bearShot.CollisionRectangle.Y))
{
burger.setHealth(burger.getHealth() - GameConstants.BearDamage);
bearShot.Active = false;
Explosion bearShotExplosion = new Explosion(explosionSpriteStrip, bearShot.CollisionRectangle.X, bearShot.CollisionRectangle.Y, explosion);
explosions.Add(bearShotExplosion);
healthString = GameConstants.HealthPrefix + burger.getHealth();
burgerDamage.Play();
CheckBurgerKill();
}
}
for (int i = 0; i < bears.Count; i++)
{
TeddyBear thisBear = bears[i];
for (int j = i + 1; j < bears.Count; j++)
{
TeddyBear thatBear = bears[j];
if (thisBear.Active && thatBear.Active)
{
CollisionResolutionInfo collisionResolution = CollisionUtils.CheckCollision(gameTime.ElapsedGameTime.Milliseconds, GameConstants.WindowWidth, GameConstants.WindowHeight, thisBear.Velocity, thisBear.DrawRectangle, thatBear.Velocity, thatBear.DrawRectangle);
if (collisionResolution != null)
{
if (collisionResolution.FirstOutOfBounds)
{
thisBear.Active = false;
}
else
{
thisBear.Velocity = collisionResolution.FirstVelocity;
thisBear.DrawRectangle = collisionResolution.FirstDrawRectangle;
thatBear.Velocity = collisionResolution.SecondVelocity;
thatBear.DrawRectangle = collisionResolution.SecondDrawRectangle;
teddyBounce.Play();
}
if (collisionResolution.SecondOutOfBounds)
{
thatBear.Active = false;
}
else
{
thatBear.Velocity = collisionResolution.SecondVelocity;
thatBear.DrawRectangle = collisionResolution.SecondDrawRectangle;
thisBear.Velocity = collisionResolution.FirstVelocity;
thisBear.DrawRectangle = collisionResolution.FirstDrawRectangle;
}
}
}
}
}
// check and resolve collisions between teddy bears and projectiles
// clean out inactive teddy bears and add new ones as necessary
for (int i = bears.Count - 1; i >= 0; i--)
{
if (!bears[i].Active)
{
bears.RemoveAt(i);
while (bears.Count < GameConstants.MaxBears)
{
SpawnBear();
}
}
}
// clean out inactive projectiles
for (int i = projectiles.Count - 1; i >= 0; i--)
{
if (!projectiles[i].Active)
{
projectiles.RemoveAt(i);
}
}
// clean out finished explosions
base.Update(gameTime);
}