Function scaleAndAdd

docs/app/js/sanddance-app.js:69938–69942

(out, a, b, scale1)

    return out;
}
function scaleAndAdd(out, a, b, scale1) {
    out[0] = a[0] + b[0] * scale1;
    out[1] = a[1] + b[1] * scale1;
    return out;
}
function distance(a, b) {
    var x = b[0] - a[0], y = b[1] - a[1];
    return Math.hypot(x, y);