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ChartDirector是一个非常理想的图表工具，它拥有广泛的图表类型、分层架构、实时互动的大数据表、普遍适应于各种应用程序以及支持PDF和SVG图标等的优点。此系列连载旨在介绍ChartDirector的实用教程，供大家学习讨论。

一、3D散点图(1)

此示例演示了创建3D散点图的基本步骤：

• 使用ThreeDScatterChart.ThreeDScatterChart创建ThreeDScatterChart对象。
• 使用ThreeDChart.setPlotRegion指定绘图区域的位置和大小。
• 使用ThreeDScatterChart.addScatterGroup将散点图组添加到图表。在此示例中，符号颜色设置为SameAsMainColor，即颜色取决于z坐标。根据颜色轴（颜色图例），可以使用ThreeDChart.colorAxis访问颜色轴。
• 使用ThreeDChart.setColorAxis设置颜色轴（颜色图例）的位置。
• 使用BaseChart.addTitle和Axis.setTitle添加图表和轴标题。
• 使用图表生成BaseChartmakeChart。

源代码清单：

以下代码可在“cppdemo / threedscatter”中找到。Mf版本的代码可在“mfcdemo / mfcdemo”中找到（仅限Windows版本）。QT版本的代码可在“qtdemo / qtdemo”中找到。

#include "chartdir.h"

int main(int argc, char *argv[])
{
    // The XYZ data for the 3D scatter chart as 3 random data series
    RanSeries *r = new RanSeries(0);
    DoubleArray xData = r->getSeries(100, 100, -10, 10);
    DoubleArray yData = r->getSeries(100, 0, 0, 20);
    DoubleArray zData = r->getSeries(100, 100, -10, 10);

    // Create a ThreeDScatterChart object of size 720 x 600 pixels
    ThreeDScatterChart *c = new ThreeDScatterChart(720, 600);

    // Add a title to the chart using 20 points Times New Roman Italic font
    c->addTitle("3D Scatter Chart (1)  ", "timesi.ttf", 20);

    // Set the center of the plot region at (350, 280), and set width x depth x height to 360 x 360
    // x 270 pixels
    c->setPlotRegion(350, 280, 360, 360, 270);

    // Add a scatter group to the chart using 11 pixels glass sphere symbols, in which the color
    // depends on the z value of the symbol
    c->addScatterGroup(xData, yData, zData, "", Chart::GlassSphere2Shape, 11, Chart::SameAsMainColor
        );

    // Add a color axis (the legend) in which the left center is anchored at (645, 270). Set the
    // length to 200 pixels and the labels on the right side.
    c->setColorAxis(645, 270, Chart::Left, 200, Chart::Right);

    // Set the x, y and z axis titles using 10 points Arial Bold font
    c->xAxis()->setTitle("X-Axis Place Holder", "arialbd.ttf", 10);
    c->yAxis()->setTitle("Y-Axis Place Holder", "arialbd.ttf", 10);
    c->zAxis()->setTitle("Z-Axis Place Holder", "arialbd.ttf", 10);

    // Output the chart
    c->makeChart("threedscatter.png");

    //free up resources
    delete r;
    delete c;
    return 0;
}

二、3D散点图(2)

此示例通过包含下划线，使用替代视角和连续着色来扩展3D散点图（1）示例。

下拉线是从数据点下降到XY平面的线。它们有助于可视化点的“高度”（z坐标），如果没有太多数据点，则可能很有用。

• 使用ThreeDChart.setViewAngle设置备用视角。
• 使用ThreeDScatterGroup.setDropLine添加下拉线。
• 使用ColorAxis.setColorGradient配置连续着色。

源代码清单：

以下代码可在“cppdemo / threedscatter”中找到。Mf版本的代码可在“mfcdemo / mfcdemo”中找到（仅限Windows版本）。QT版本的代码可在“qtdemo / qtdemo”中找到。

#include "chartdir.h"

int main(int argc, char *argv[])
{
    // The XYZ data for the 3D scatter chart as 3 random data series
    RanSeries *r = new RanSeries(3);
    DoubleArray xData = r->getSeries(20, 100, -10, 10);
    DoubleArray yData = r->getSeries(20, 100, -10, 10);
    DoubleArray zData = r->getSeries(20, 100, -10, 10);

    // Create a ThreeDScatterChart object of size 720 x 520 pixels
    ThreeDScatterChart *c = new ThreeDScatterChart(720, 520);

    // Add a title to the chart using 20 points Times New Roman Italic font
    c->addTitle("3D Scatter Chart (2)  ", "timesi.ttf", 20);

    // Set the center of the plot region at (350, 240), and set width x depth x height to 360 x 360
    // x 270 pixels
    c->setPlotRegion(350, 240, 360, 360, 270);

    // Set the elevation and rotation angles to 15 and 30 degrees
    c->setViewAngle(15, 30);

    // Add a scatter group to the chart using 13 pixels glass sphere symbols, in which the color
    // depends on the z value of the symbol
    ThreeDScatterGroup *g = c->addScatterGroup(xData, yData, zData, "", Chart::GlassSphere2Shape,
        13, Chart::SameAsMainColor);

    // Add grey (888888) drop lines to the symbols
    g->setDropLine(0x888888);

    // Add a color axis (the legend) in which the left center is anchored at (645, 220). Set the
    // length to 200 pixels and the labels on the right side. Use smooth gradient coloring.
    c->setColorAxis(645, 220, Chart::Left, 200, Chart::Right)->setColorGradient();

    // Set the x, y and z axis titles using 10 points Arial Bold font
    c->xAxis()->setTitle("X-Axis Place Holder", "arialbd.ttf", 10);
    c->yAxis()->setTitle("Y-Axis Place Holder", "arialbd.ttf", 10);
    c->zAxis()->setTitle("Z-Axis Place Holder", "arialbd.ttf", 10);

    // Output the chart
    c->makeChart("threedscatter2.png");

    //free up resources
    delete r;
    delete c;
    return 0;
}

更多实用教程将会以连载的形式展现，敬请关注~

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