npetrovski / l2-world-map Goto Github PK

        const zoom = (slider.value * 10) / slider.max,
          rect = container.getBoundingClientRect(),
          halfWidth = rect.width / 2,
          halfHeight = rect.height / 2;

        const offsetX = WorldToPic(npcX, zoom),
          offsetY = WorldToPic(npcY, zoom);

          ctx.fillStyle = 'blue';
         ctx.fillRect(halfWidth - offsetX  , halfHeight - offsetY, 10, 10);