/**
* Simulates the result of a blocks falling inside a buffer. If the blocks reach the bottom of the
* buffer without hitting any obstacles they may either be removed or stopped at the bottom. If
* the block at (x, y, z) is not a SolidMoving, nothing will happen, else it and the blocks above
* will be subject to the simulation. If the blocks fall on a placement obstacle (such as a torch)
* they will be removed.
*
* @param buffer The buffer in which to simulate the fall.
* @param x The x coordinate of the block.
* @param y The y coordinate of the block.
* @param z The Z coordinate of the block.
* @param remove If the blocks should be removed after reaching the bottom of the buffer, or
* stopped.
*/
public static void simulateFall(
CuboidBlockMaterialBuffer buffer, int x, int y, int z, boolean remove) {
if (!buffer.isInside(x, y, z)) {
return;
}
BlockMaterial falling = buffer.get(x, y, z);
if (!(falling instanceof SolidMoving)) {
return;
}
int baseY = buffer.getBase().getFloorY();
for (int obstacleY = y; --obstacleY >= baseY; ) {
if (FallingBlock.isFallingObstacle(buffer.get(x, obstacleY, z))) {
// obstacle found
if (obstacleY == y - 1) {
// right underneath, nowhere to fall
return;
}
if (buffer.get(x, ++obstacleY, z).isPlacementObstacle()) {
// blocks can't stay here. Delete them
remove = true;
break;
}
do {
// move the blocks above the obstacle
buffer.set(x, obstacleY++, z, falling);
buffer.set(x, y++, z, VanillaMaterials.AIR);
} while ((falling = buffer.get(x, y, z)) instanceof SolidMoving);
return;
}
}
// no obstacle found
if (remove) {
// delete the blocks
final int topY = buffer.getTop().getFloorY() - 1;
do {
buffer.set(x, y++, z, VanillaMaterials.AIR);
} while (y <= topY && buffer.get(x, y, z) instanceof SolidMoving);
} else {
// move the blocks to the bottom of the buffer
do {
buffer.set(x, baseY++, z, falling);
buffer.set(x, y++, z, VanillaMaterials.AIR);
} while ((falling = buffer.get(x, y, z)) instanceof SolidMoving);
}
}
