Function scaleTranslate

docs/app/js/sanddance-app.js:133865–133881

(k, dx, dy, sx, sy)

    });
}
function scaleTranslate(k, dx, dy, sx, sy) {
    function transform(x, y) {
        x *= sx;
        y *= sy;
        return [
            dx + k * x,
            dy - k * y
        ];
    }
    transform.invert = function(x, y) {
        return [
            (x - dx) / k * sx,
            (dy - y) / k * sy
        ];
    };
    return transform;
}
function scaleTranslateRotate(k, dx, dy, sx, sy, alpha) {
    if (!alpha) return scaleTranslate(k, dx, dy, sx, sy);
    var cosAlpha = (0, _mathJs.cos)(alpha), sinAlpha = (0, _mathJs.sin)(alpha), a = cosAlpha * k, b = sinAlpha * k, ai = cosAlpha / k, bi = sinAlpha / k, ci = (sinAlpha * dy - cosAlpha * dx) / k, fi = (sinAlpha * dx + cosAlpha * dy) / k;