Function zOrder

docs/app/js/sanddance-app.js:102003–102015

(x, y, minX, minY, invSize)

    return list;
}
function zOrder(x, y, minX, minY, invSize) {
    x = 32767 * (x - minX) * invSize;
    y = 32767 * (y - minY) * invSize;
    x = (x | x << 8) & 0x00ff00ff;
    x = (x | x << 4) & 0x0f0f0f0f;
    x = (x | x << 2) & 0x33333333;
    x = (x | x << 1) & 0x55555555;
    y = (y | y << 8) & 0x00ff00ff;
    y = (y | y << 4) & 0x0f0f0f0f;
    y = (y | y << 2) & 0x33333333;
    y = (y | y << 1) & 0x55555555;
    return x | y << 1;
}
function getLeftmost(start) {
    let p = start;
    let leftmost = start;