/// <summary>
/// Checks interactions between balls and other game instances (death triggers, player paddle, walls, bricks).
/// TODO: Could be optimized - when ball is moving from a certain position in a certain direction,
/// not all bricks have to be checked for collision.
/// </summary>
private void CheckBalls()
{
for (int i = 0; i < Balls.Count; i++)
{
var ball = Balls[i];
if (ball.IsPinned)
{
Vector pinnedPosition = PlayerPaddle.GetPinnedPosition();
ball.X = pinnedPosition.X - ball.Width / 2;
ball.Y = pinnedPosition.Y - ball.Height;
continue;
}
ball.UpdatePosition();
Vector hitDirection = new Vector();
// Interaction with player paddle
if (ball.Intersect(PlayerPaddle, ref hitDirection))
{
ball.Bounce(ref hitDirection);
if (PlayerPaddle.CurrentPlayerDirection == Paddle.PlayerDirection.left)
{
ball.DeflectX(-0.85);
}
else if (PlayerPaddle.CurrentPlayerDirection == Paddle.PlayerDirection.right)
{
ball.DeflectX(0.85);
}
}
// Interaction with walls
foreach (var wall in CurrentLevel.Walls)
{
if (ball.Intersect(wall, ref hitDirection))
{
ball.Bounce(ref hitDirection);
}
}
// Interaction with death triggers
foreach (var trigger in CurrentLevel.DeathTriggers)
{
if (ball.Intersect(trigger, ref hitDirection))
{
Balls.Remove(ball);
if (Balls.Count < 1)
{
for (int j = Collectables.Count - 1; j >= 0; j--)
{
Collectables.RemoveAt(i);
}
RemoveLife();
}
continue;
}
}
// Interaction with bricks
foreach (var brickRow in CurrentLevel.BrickRows)
{
for (int j = brickRow.Count - 1; j >= 0; j--)
{
Brick brick = brickRow[j];
if (ball.Intersect(brick, ref hitDirection))
{
brick.Hit(ball.Damage);
if (!brick.Alive())
{
CurrentPlayerStats.Score += brick.BrickPoints;
int rnd = _randomGenerator.Next(0, 100);
if (rnd < 10)
{
Collectables.Add(new Collectable(Collectable.CollectableType.clone_all, brick.X, brick.Y));
}
else if (rnd > 10 && rnd < 15)
{
Collectables.Add(new Collectable(Collectable.CollectableType.increase_width, brick.X, brick.Y));
}
else if (rnd > 15 && rnd < 20)
{
Collectables.Add(new Collectable(Collectable.CollectableType.decrease_width, brick.X, brick.Y));
}
else if (rnd > 20 && rnd < 25)
{
Collectables.Add(new Collectable(Collectable.CollectableType.decrease_speed, brick.X, brick.Y));
}
else if (rnd > 25 && rnd < 30)
{
Collectables.Add(new Collectable(Collectable.CollectableType.add_life, brick.X, brick.Y));
}
else if (rnd > 30 && rnd < 35)
{
Collectables.Add(new Collectable(Collectable.CollectableType.increase_damage, brick.X, brick.Y));
}
brickRow.Remove(brick);
if (CurrentLevel.IsAllEmpty())
{
NextLevel();
}
}
ball.Bounce(ref hitDirection);
}
}
}
}
}
