{#if fx.kind === "portal"}
{@const x1 = fx.side === "E" ? (fx.cell.x + 1) * CELL : fx.cell.x * CELL}
{@const y1 = fx.side === "S" ? (fx.cell.y + 1) * CELL : fx.cell.y * CELL}
{@const x2 = fx.side === "W" ? fx.cell.x * CELL : (fx.cell.x + 1) * CELL}
{@const y2 = fx.side === "N" ? fx.cell.y * CELL : (fx.cell.y + 1) * CELL}