Exemplo n.º 1
0
 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);
 }
Exemplo n.º 2
0
        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);
                    }
                }
            }
        }