Highcharts：3D分散数据点投影

Question

我正在尝试使用Highcharts创建一些数据的3D散点图。为了更容易理解数据点的3D位置，特别是在使用绘图的静态图片而不是交互式可拖动版本时，我想在每个绘图边界平面上创建数据的投影。

分配这些投影的相应位置并不困难（例如：http://jsfiddle.net/worg6jLz/1/），但我希望它们显示为真实的投影，而不仅仅是圆圈（或实际的球体），无论视角如何。

有没有办法根据相应的投影平面变换绘图标记，这样无论视点如何，它们的形状都与这种投影一致？

感谢。

$(function () {

    // Give the points a 3D feel by adding a radial gradient
    Highcharts.getOptions().colors = $.map(Highcharts.getOptions().colors, function (color) {
        return {
            radialGradient: {
                cx: 0.4,
                cy: 0.3,
                r: 0.5
            },
            stops: [
                [0, color],
                [1, Highcharts.Color(color).brighten(-0.2).get('rgb')]
            ]
        };
    });

    // Set up the chart
    var chart = new Highcharts.Chart({
        chart: {
            renderTo: 'container',
            margin: 100,
            type: 'scatter',
            options3d: {
                enabled: true,
                alpha: 10,
                beta: 30,
                depth: 450,
                viewDistance: 5,
                fitToPlot: false,
                frame: {
                    bottom: { size: 1, color: 'rgba(0,0,0,0.02)' },
                    back: { size: 1, color: 'rgba(0,0,0,0.04)' },
                    side: { size: 1, color: 'rgba(0,0,0,0.06)' }
                }
            }
        },
        title: {
            text: 'Draggable box'
        },
        subtitle: {
            text: 'Click and drag the plot area to rotate in space'
        },
        plotOptions: {
            scatter: {
                width: 10,
                height: 10,
                depth: 10
            }
        },
        yAxis: {
            min: 0,
            max: 10,
            title: null
        },
        xAxis: {
            min: 0,
            max: 10,
            gridLineWidth: 1
        },
        zAxis: {
            min: 0,
            max: 10,
            showFirstLabel: false
        },
        legend: {
            enabled: false
        },
        series: [{
            name: 'Data',
            marker: {radius: 7,
                                symbol: 'circle',
                        fillColor: {
                        radialGradient: { cx: 0.4, cy: 0.3, r: 0.5 },
                        stops: [[0, 'rgba(195,195,255,1)'],
                               [1, 'rgba(0,0,255,1)']]}
                      },
            colorByPoint: false,
            color: 'blue',
            data: [[9,9,1],[8,8,2],[7,7,3],[6,6,4],[5,5,5],[4,4,6],[3,3,7],[2,2,8],[1,1,9]]
        },
        {
            name: 'Proj.A',
            marker: {radius: 7,
                                symbol: 'circle'},
            colorByPoint: false,
            color: 'rgba(155,155,155,1)',
            data: [[0,9,1],[0,8,2],[0,7,3],[0,6,4],[0,5,5],[0,4,6],[0,3,7],[0,2,8],[0,1,9]]
        },
        {
            name: 'Proj.B',
            marker: {radius: 7,
                                symbol: 'circle'},
            colorByPoint: false,
            color: 'rgba(155,155,155,1)',
            data: [[9,0,1],[8,0,2],[7,0,3],[6,0,4],[5,0,5],[4,0,6],[3,0,7],[2,0,8],[1,0,9]]
        },
        {
            name: 'Proj.C',
            marker: {radius: 7,
                                symbol: 'circle'},
            colorByPoint: false,
            color: 'rgba(155,155,155,1)',
            data: [[9,9,10],[8,8,10],[7,7,10],[6,6,10],[5,5,10],[4,4,10],[3,3,10],[2,2,10],[1,1,10]]
        }]
    });


    // Add mouse events for rotation
    $(chart.container).bind('mousedown.hc touchstart.hc', function (eStart) {
        eStart = chart.pointer.normalize(eStart);

        var posX = eStart.pageX,
            posY = eStart.pageY,
            alpha = chart.options.chart.options3d.alpha,
            beta = chart.options.chart.options3d.beta,
            newAlpha,
            newBeta,
            sensitivity = 5; // lower is more sensitive

        $(document).bind({
            'mousemove.hc touchdrag.hc': function (e) {
                // Run beta
                newBeta = beta + (posX - e.pageX) / sensitivity;
                chart.options.chart.options3d.beta = newBeta;

                // Run alpha
                newAlpha = alpha + (e.pageY - posY) / sensitivity;
                chart.options.chart.options3d.alpha = newAlpha;

                chart.redraw(false);
            },
            'mouseup touchend': function () {
                $(document).unbind('.hc');
            }
        });
    });

});

加成： 另一个有趣的功能，虽然不是这篇文章的主要目的，但是当鼠标指针放在它们上方时，绘制将数据点与其投影相连的线。