move_direction = MovDir[dropx][dropy];
nextx = dropx + GET_DX_FROM_DIR(move_direction);
nexty = dropy + GET_DY_FROM_DIR(move_direction);
move_direction = MovDir[dropx][dropy];
nextx = dropx + GET_DX_FROM_DIR(move_direction);
nexty = dropy + GET_DY_FROM_DIR(move_direction);