Gif Loop Coder Circles

function onGLC(glc) {
    glc.loop();
    glc.styles.backgroundColor = "#fff";
    // glc.playOnce();
     glc.size(300, 300);
    glc.setDuration(4);
    // glc.setFPS(20);
    // glc.setMode("single");
    // glc.setEasing(false);
    glc.setMaxColors(20);
    var list = glc.renderList,
        width = glc.w,
        height = glc.h;

    for (var i = 0; i < 50; i++) {
        list.addCircle({
            x: [Math.random() * width*2-width/2,Math.random() * width*2-width/2],
            // y: [Math.random() * height,Math.random() * height],
            y: 150,
            lineWidth: 2,
            stroke: true,
            strokeStyle: "blue",
            fillStyle: ["rgba(0,0,255,0.05)","rgba(255,0,255,0.05)"],
            phase:  i* 0.05,
            radius: Math.random() * 400 + 100
        });
    }