zrender里如何创建createLinearGradient渐变方法

已知2个点p1,p1如何在zrender里添加createLinearGradient？

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问题是如何用 zrender 画一条渐变的线对么？

require(
    ['zrender', 'zrender/shape/Line', 'zrender/tool/color'],
    function(zrender, LineShape, color) {

        var stage = document.getElementById('stage');

        var zr = zrender.init(stage);

        var p0 = {x: 0, y: 0};
        var p1 = {x: Math.ceil(zr.getWidth()), y: Math.ceil(zr.getHeight())};


        var colorList = [[0, '#333'], [1, '#fff']];
        var linearGradient = color.getLinearGradient(0, 0, 0, p1.y, colorList);

        zr.addShape(new LineShape({
            style: {
                xStart: p0.x,
                yStart: p0.y,
                xEnd: p1.x,
                yEnd: p1.y,
                strokeColor: linearGradient,
                lineWidth: 10
            },
            draggable: true
        }));

        zr.render();
    }
);

DEMO 看 codepen