Letterbox Canvas
DEFINITION
Drawing a game at a fixed logical size and scaling it to fill the screen while keeping the aspect ratio.
Every Shumiwu game renders on a 960×540 logical canvas. On a wider screen the extra space becomes background; on a taller one it becomes bands above and below. Because input is converted through the same transform, a tap lands on the same logical point whatever the device — which is why a phone playthrough feels identical to a desktop one.