/// <summary>
/// Triggered when an entire block stack stops moving.
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
private void OnMovingChanged(object sender, BlockStackEventArgs args)
{
// Check the board, but only if we dropped a block
if (Board.IsGroundBlock(args.Stack.TopBlock))
{
Game.State.Board.CheckLayout(args.Stack.X, args.Stack.Y);
}
}
/// <summary>
/// Triggered when a block stops moving.
/// </summary>
private void OnBlockMovingChanged(
object sender, BlockStackEventArgs args)
{
// Only bother if we are dropping a ground block
if (!Board.IsGroundBlock(args.Block) ||
!droppingBlocks.Contains(args.Block))
{
return;
}
// First check for bugs
foreach (Block block in args.Stack)
{
// Ignore processing ourselves
if (args.Block == block)
{
continue;
}
// Ignore if the position isn't close
if ((int)args.Block.BottomPosition != (int)block.TopPosition)
{
continue;
}
// Check for the drawable
if (block.Sprite.ID == Constants.BugBlockName)
{
// Remove the bug
(block as Bug).Remove();
// Start falling again
args.Block.BottomPosition -= 1f;
args.Block.Vector = Constants.DroppedVector;
// Finish processing
return;
}
}
// Remove it
droppingBlocks.Remove(args.Block);
}
/// <summary>
/// This returns true if the current stack may be grabbed from.
/// </summary>
/// <param name="stack"></param>
/// <returns></returns>
private bool CanGrab()
{
// Ignore everything if we don't have a stack
if (currentStack == null)
{
return(false);
}
// See if we have room to grab things
if (grabStack[Game.State.GrabCount - 1] != null)
{
// The highest one is filled, so we can't grab
return(false);
}
// Get the positions we use
float topPosition = currentStack.TopPosition;
Block topBlock = currentStack.TopBlock;
// Check the top position
if (topPosition == Constants.TopImmobilePosition)
{
// We only have an immobile block
return(false);
}
// See if we are a ground block
if (!Board.IsGroundBlock(topBlock))
{
// We aren't a grabbable block
return(false);
}
// If we have data in the block, it is immobile
if (topBlock.Data != null)
{
return(false);
}
// It appears to be a valid block
return(true);
}
/// <summary>
/// This returns true if the currently selected block can be
/// dropped on by the bottom-most (index 0) index of the grab
/// stack.
/// </summary>
/// <param name="stack"></param>
/// <returns></returns>
private bool CanDrop()
{
// Ignore nulls stacks
if (currentStack == null)
{
return(false);
}
// We don't bother if we don't have anything to drop
if (grabStack[0] == null)
{
return(false);
}
// Get the positions we use
float topPosition = currentStack.TopPosition;
Block topBlock = currentStack.TopBlock;
// Check the top position
if (topPosition >= Constants.TopGroundPosition)
{
// We have too many blocks
return(false);
}
// See if we are a ground block
if (!Board.IsGroundBlock(topBlock) &&
!Board.IsImmobileBlock(topBlock) &&
topBlock.Sprite.ID != Constants.BugBlockName ||
topBlock.Data != null)
{
// We aren't a grabbable block
return(false);
}
// It appears to be a valid block
return(true);
}