/// <summary>
/// Checks collision between two rotated rectangles
/// </summary>
/// <param name="drawRectangle1">First rectangle</param>
/// <param name="drawRectangle2">Second Rectangle</param>
/// <returns>True or False</returns>
public static bool CheckRotatedCollision(Asteroid asteroid, Projectile projectile)
{
float distance = 0.0f;
Vector2 position1 = asteroid.Position;
Vector2 position2 = projectile.Position;
float Cathetus1 = Math.Abs(position1.X - position2.X);
float Cathetus2 = Math.Abs(position1.Y - position2.Y);
Cathetus1 *= Cathetus1;
Cathetus2 *= Cathetus2;
distance = (float)Math.Sqrt(Cathetus1 + Cathetus2);
if ((int)distance < asteroid.CollisionRectangle.Width)
{
return true;
}
return false;
}
/// <summary>
/// Adds the given projectile to the game
/// </summary>
/// <param name="projectile">the projectile to add</param>
public static void AddProjectile(Projectile projectile)
{
projectiles.Add(projectile);
}
public void Update(GameTime gameTime, KeyboardState keyboard)
{
//Ship moves only if still has health
if (health > 0)
{
if (keyboard.IsKeyDown(Keys.Up))
{
AccelerateShip();
}
if (keyboard.IsKeyDown(Keys.Down))
{
DecelerateShip();
}
if (keyboard.IsKeyDown(Keys.Left))
{
this.Rotation -= 0.05f;
}
if (keyboard.IsKeyDown(Keys.Right))
{
this.Rotation += 0.05f;
}
//Move the ship
this.Position += this.Velocity;
if (this.Position.X + this.drawRectangle.Width < 0)
{
this.Position = new Vector2(GameConstants.VIEWPORT_WIDTH, this.Position.Y);
}
if (this.Position.X - this.drawRectangle.Width > GameConstants.VIEWPORT_WIDTH)
{
this.Position = new Vector2(0, this.Position.Y);
}
if (this.Position.Y + this.drawRectangle.Height < 0)
{
this.Position = new Vector2(this.Position.X, GameConstants.VIEWPORT_HEIGHT);
}
if (this.Position.Y - this.drawRectangle.Height > GameConstants.VIEWPORT_HEIGHT)
{
this.Position = new Vector2(this.Position.X, 0);
}
//Shooting logic
if (!canShoot)
{
elapsedCooldownTime += gameTime.ElapsedGameTime.Milliseconds;
if (elapsedCooldownTime >= GameConstants.SHIP_COOLDOWN_MILLISECONDS ||
keyboard.IsKeyUp(Keys.Space))
{
canShoot = true;
elapsedCooldownTime = 0;
}
}
//Shoot if alive
if (health > 0 && keyboard.IsKeyDown(Keys.Space) && canShoot)
{
canShoot = false;
Vector2 velocity = new Vector2(
(float)Math.Cos(this.Rotation - (float)MathHelper.PiOver2),
(float)Math.Sin(this.Rotation - (float)MathHelper.PiOver2));
velocity.Normalize();
velocity *= GameConstants.PROJECTILE_SPEED;
Vector2 position = this.position + velocity;
Projectile projectile = new Projectile(MainGameScreen.GetProjectileSprite(), position, velocity);
MainGameScreen.AddProjectile(projectile);
shootSound.Play();
}
}
}