/// <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>
/// Creates an asteroid
/// </summary>
private void CreateAsteroid()
{
RandomGenerator.Init();
//Generate random location
int x = GetRandomLocation(GameConstants.SPAWN_BORDER_SIZE,
GameConstants.VIEWPORT_WIDTH + GameConstants.SPAWN_BORDER_SIZE);
int y = GetRandomLocation(GameConstants.SPAWN_BORDER_SIZE,
GameConstants.VIEWPORT_HEIGHT - 2 * GameConstants.SPAWN_BORDER_SIZE);
Vector2 asteroidPosition = new Vector2(x, y);
//Generate random velocity
float xVelocity = (float)(RandomGenerator.NextDouble() * 2 + .5);
float yVelocity = (float)(RandomGenerator.NextDouble() * 2 + .5);
if (RandomGenerator.Next(2) == 1)
xVelocity *= -1.0f;
if (RandomGenerator.Next(2) == 1)
yVelocity *= -1.0f;
Vector2 velocity = new Vector2(xVelocity, yVelocity);
//Create new asteroid
Asteroid newAsteroid = new Asteroid(ScreenManager.Textures["Objects/asteroid_pixelated"], asteroidPosition, velocity);
//// make sure we don't spawn into a collision
List<Rectangle> collisionrectangles = GetCollisionRectangles();
bool collFree = CollisionUtils.IsCollisionFree(newAsteroid.CollisionRectangle, collisionrectangles);
while (!collFree)
{
newAsteroid.Position = new Vector2(GetRandomLocation(GameConstants.SPAWN_BORDER_SIZE,
GameConstants.VIEWPORT_WIDTH - 2 * GameConstants.SPAWN_BORDER_SIZE),
GetRandomLocation(GameConstants.SPAWN_BORDER_SIZE,
GameConstants.VIEWPORT_HEIGHT - 2 * GameConstants.SPAWN_BORDER_SIZE));
collFree = true;
}
asteroidsList.Add(newAsteroid);
}