Track editor

Pick what you're drawing with the mode buttons. Racing line: click to drop points — a smooth curve is threaded through them, so corners come out rounded; drag to reshape, drag on the loop to insert, right/double-click to delete, drag the checkered S/F handle to set start/finish, and Raise/lower a point onto the upper deck (the ramp) so the crossover draws as a bridge. Building walls are the permanent barriers shared by every layout; Layout walls are the movable blocks specific to this layout. For walls, click to extend the wall from its highlighted (yellow) end; click the wall's other endpoint to switch ends so it grows the opposite way, click on a wall line to insert a point mid-wall, and New wall to start another. Walls curve smoothly through their points just like the racing line, so a few points make a rounded barrier. The venue runs three layouts that rotate every few months — keep all three here and mark one active for the Live page. Saving stores the layout (line + its walls) and the shared building walls together.

Points and the start/finish line are stored normalized (0–1), so the shape scales to any screen. The Live page maps each racer's current lap fraction onto this loop to animate their kart.