private void EnemyShipBorderCollisions(EnemyShip enemyShip)
{
//Get the specific sprite box of the player ship for collision calculation
Rectangle levelBorder = m_level.GetLevelRectangle();
Rectangle enemyShipSpriteBox = enemyShip.GeneralSpriteBox;
//Check for Collisions with level border and enemy ship , and calculates re-adjust necessary and passes it to the ship's collision handler to
//re-position / other effects
if (enemyShipSpriteBox.Left < levelBorder.Left || enemyShipSpriteBox.Right > levelBorder.Right ||
enemyShipSpriteBox.Top < levelBorder.Top || enemyShipSpriteBox.Bottom >= levelBorder.Bottom)
enemyShip.ShipCollisionHandler(1);
}
private void EnemyShipAsteroidCollisions( EnemyShip enemyShip)
{
List<LinkedList<Asteroid>> boundAsteroids = m_level.GetAsteroidPartitionTree().GetPartitionItems(enemyShip.GeneralSpriteBox);
if (boundAsteroids.Count > 0)
{
foreach (LinkedList<Asteroid> asteroids in boundAsteroids)
{
foreach (Asteroid asteroid in asteroids)
{
//Check for asteroids within the vicinity of the enemy ship, and check for collisions against these asteroids.
//Also, if there is no collision against the enemy ship itself use the evasion prediction box of the enemy ship
//to pre-emptively try to avoid collisions
//The evasion box is a simple technique used to evade asteroids, however it is not entirely accurate because it uses the
//enemyship sprite box to find asteroids within vicinity, this will work for our purposes. However if you want more accurate
//prediction, we have to get all asteroids within partitions of the evasion box.
if (enemyShip.GeneralSpriteBox.Intersects(asteroid.GeneralSpriteBox))
enemyShip.ShipCollisionHandler(2);
else if (enemyShip.GetEvasionRectangle().Intersects(asteroid.GeneralSpriteBox))
enemyShip.ShipCollisionHandler(3);
}
}
}
}