Stacked Radar Chart

The following is the command line version of the code in "cppdemo/stackradar". The MFC version of the code is in "mfcdemo/mfcdemo". The Qt Widgets version of the code is in "qtdemo/qtdemo". The QML/Qt Quick version of the code is in "qmldemo/qmldemo".
#include "chartdir.h"

int main(int argc, char *argv[])
{
    // The data for the chart
    double data0[] = {100, 100, 100, 100, 100};
    const int data0_size = (int)(sizeof(data0)/sizeof(*data0));
    double data1[] = {90, 85, 85, 80, 70};
    const int data1_size = (int)(sizeof(data1)/sizeof(*data1));
    double data2[] = {80, 65, 65, 75, 45};
    const int data2_size = (int)(sizeof(data2)/sizeof(*data2));

    // The labels for the chart
    const char* labels[] = {"Population<*br*><*font=Arial*>6 millions",
        "GDP<*br*><*font=Arial*>120 billions", "Export<*br*><*font=Arial*>25 billions",
        "Import<*br*><*font=Arial*>24 billions", "Investments<*br*><*font=Arial*>20 billions"};
    const int labels_size = (int)(sizeof(labels)/sizeof(*labels));

    // Create a PolarChart object of size 480 x 460 pixels. Set background color to silver, with 1
    // pixel 3D border effect
    PolarChart* c = new PolarChart(480, 460, Chart::silverColor(), 0x000000, 1);

    // Add a title to the chart using 15pt Times Bold Italic font. The title text is white (ffffff)
    // on a deep green (008000) background
    c->addTitle("Economic Growth", "Times New Roman Bold Italic", 15, 0xffffff)->setBackground(
        0x008000);

    // Set plot area center at (240, 270), with 150 pixels radius
    c->setPlotArea(240, 270, 150);

    // Use 1 pixel width semi-transparent black (c0000000) lines as grid lines
    c->setGridColor(0xc0000000, 1, 0xc0000000, 1);

    // Add a legend box at top-center of plot area (240, 35) using horizontal layout. Use 10pt Arial
    // Bold font, with silver background and 1 pixel 3D border effect.
    LegendBox* b = c->addLegend(240, 35, false, "Arial Bold", 10);
    b->setAlignment(Chart::TopCenter);
    b->setBackground(Chart::silverColor(), Chart::Transparent, 1);

    // Add area layers of different colors to represent the data
    c->addAreaLayer(DoubleArray(data0, data0_size), 0xcc8880, "Year 2004");
    c->addAreaLayer(DoubleArray(data1, data1_size), 0xffd080, "Year 1994");
    c->addAreaLayer(DoubleArray(data2, data2_size), 0xa0bce0, "Year 1984");

    // Set the labels to the angular axis as spokes.
    c->angularAxis()->setLabels(StringArray(labels, labels_size));

    // Set radial axis from 0 - 100 with a tick every 20 units
    c->radialAxis()->setLinearScale(0, 100, 20);

    // Just show the radial axis as a grid line. Hide the axis labels by setting the label color to
    // Transparent
    c->radialAxis()->setColors(0xc0000000, Chart::Transparent);

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

    //free up resources
    delete c;

    return 0;
}