var qcanvas = new Qcanvas({
    id: 'qcanvas',
    width: 300,
    height: 200
});

var polygon = qcanvas.polygon({
    r: 30,
    num: 6,
    start: [100, 100]
})
var shape = qcanvas.shape({
    fillColor: '#999',
    opacity: 0.3,
    points: function() {
        return [
            [80, 10],
            [80, 50],
            [150, 70],
            [160, 20],
        ]
    }
});