Function darker

pattern/canvas.js:812–819

(clr, step)

}

function darker(clr, step) {
    /* Returns a copy of the color with a darker brightness.
     */
    if (step === undefined) step = 0.2;
    var hsb = _rgb2hsb(clr.r, clr.g, clr.b);
    var rgb = _hsb2rgb(hsb[0], hsb[1], Math.max(0, hsb[2]-step));
    return new Color(rgb[0], rgb[1], rgb[2], clr.a);
}

function lighter(clr, step) {
    /* Returns a copy of the color with a lighter brightness.