public Cluster(Vector2 position, float blockSize)
{
FirstBlock = new Block((BlockType)PuzzleGame.r.Next(0, 6), new Vector2(position.X, position.Y + blockSize / 2), blockSize);
SecondBlock = new Block((BlockType)PuzzleGame.r.Next(0, 6), new Vector2(position.X, position.Y - blockSize / 2), blockSize);
this.blockSize = blockSize;
firstOldPosition = FirstBlock.Position;
secondOldPosition = SecondBlock.Position;
}
public Block[] Separate()
{
Block[] blocks = new Block[2];
blocks[0] = FirstBlock;
blocks[1] = SecondBlock;
IsMoving = false;
return blocks;
}
/// <summary>
/// Determines number of blocks of same color connected to and explodes them if needed
/// </summary>
private void CheckBlock(Block block)
{
if (block.BlockType != BlockType.Black)
{
List<Block> sameColorChain = new List<Block>();
sameColorChain = CheckForChain(block, block.BlockType, sameColorChain);
int notBlackCount = sameColorChain.FindAll(b => b.BlockType != BlockType.Black).Count;
if (notBlackCount > 3)
ExplodeChain(sameColorChain);
}
}
/// <summary>
/// Adds block if of right type and recursively checks neighbours
/// </summary>
/// <param name="block"></param>
/// <param name="type"></param>
/// <param name="chain"></param>
/// <returns></returns>
private List<Block> CheckForChain(Block block, BlockType type, List<Block> chain)
{
if (block != null && !chain.Contains(block))
{
if (block.BlockType == type || block.BlockType == BlockType.Black)
{
chain.Add(block);
if (block.BlockType != BlockType.Black)
{
int blockX = GridPositionX(block.Position);
int blockY = GridPositionY(block.Position);
if (blockX - 1 >= 0)
chain = CheckForChain(staticBlocks[blockX - 1, blockY], type, chain);
if (blockX + 1 < staticBlocks.GetLength(0))
chain = CheckForChain(staticBlocks[blockX + 1, blockY], type, chain);
if (blockY - 1 >= 0)
chain = CheckForChain(staticBlocks[blockX, blockY - 1], type, chain);
if (blockY + 1 < staticBlocks.GetLength(1))
chain = CheckForChain(staticBlocks[blockX, blockY + 1], type, chain);
}
}
}
return chain;
}
/// <summary>
/// Checks if a block collides with anything
/// </summary>
/// <param name="block"></param>
protected void CheckForBlockCollision(Block block)
{
int posX = GridPositionX(block.Position);
int posY = GridPositionY(block.Position);
Vector2 pos = GetStaticPosition(block, posY);
if (BlockHasCollided(block))
{
block.Attach(pos);
staticBlocks[posX, posY] = block;
if (BlackBlockCollision != null)
if (block.BlockType == BlockType.Black)
BlackBlockCollision(this, new BlackBlockCollisionEventArgs(pos));
}
}
protected Block CreateBlackBlock(int gridIndex)
{
Block blackBlock = new Block(BlockType.Black,
GridOrigin() + new Vector2(gridIndex * blockSize, 0), blockSize);
blackBlock.IsMoving = true;
blackBlock.DropSpeed = BaseDropSpeed * dropSpeedBonus;
return blackBlock;
}
/// <summary>
/// Determines if a moving block collides with the bottom or a static block.
/// </summary>
/// <param name="block"></param>
/// <returns></returns>
protected bool BlockHasCollided(Block block)
{
int posX = GridPositionX(block.Position);
int posY = GridPositionY(block.Position);
//bottom collision (left) & block collision (right)
return block.Position.Y >= Position.Y + 0.5 * (Height - blockSize) || staticBlocks[posX, posY - 1] != null;
}
private Vector2 GetStaticPosition(Block block, int gridPosY)
{
return new Vector2(block.Position.X, Position.Y + 0.5f * Height - (gridPosY + 0.5f) * blockSize + 0.005f);
}
private Image GetImage(Block block)
{
if (block.IsExploding)
return explosionAnimation;
return blockImages[(int)block.BlockType];
}
/// <summary>
/// Explodes a block and increments score counter
/// </summary>
/// <param name="block"></param>
private void ExplodeBlockAndScore(Block block)
{
int blockX = GridPositionX(block.Position);
int blockY = GridPositionY(block.Position);
staticBlocks[blockX, blockY] = null;
block.Explode();
explodingBlocks.Add(block);
if (block.BlockType != BlockType.Black)
scoreCounter.Score += 50 * scoreMultiplier * SpeedMultiplier;
}
private void DrawBlock(Block block, GameTime gameTime)
{
if (!block.IsDisposing)
block.Draw(gameTime, GetImage(block));
}
