Function Tile_MoveByDirection

src/tile.c:276–296

* Get the tile from given tile at given distance in given direction. * * @param tile The origin. * @param orientation The direction to follow. * @param distance The distance. * @return The tile. */

 * @return The tile.
 */
tile32 Tile_MoveByDirection(tile32 tile, int16 orientation, uint16 distance)
{
	int diffX, diffY;
	int roundingOffsetX, roundingOffsetY;

	distance = min(distance, 0xFF);

	if (distance == 0) return tile;

	diffX = _stepX[orientation & 0xFF];
	diffY = _stepY[orientation & 0xFF];

	/* Always round away from zero */
	roundingOffsetX = diffX < 0 ? -64 : 64;
	roundingOffsetY = diffY < 0 ? -64 : 64;

	tile.x += (diffX * distance + roundingOffsetX) / 128;
	tile.y -= (diffY * distance + roundingOffsetY) / 128;

	return tile;
}

/**
 * Get the tile from given tile at given maximum distance in random direction.