Circular Zones

The following is the command line version of the code in "cppdemo/polarzones". 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 data[] = {51, 15, 51, 40, 17, 87, 94, 21, 35, 88, 50, 60};
    const int data_size = (int)(sizeof(data)/sizeof(*data));

    // The labels for the chart
    const char* labels[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct",
        "Nov", "Dec"};
    const int labels_size = (int)(sizeof(labels)/sizeof(*labels));

    // Create a PolarChart object of size 400 x 420 pixels
    PolarChart* c = new PolarChart(400, 420);

    // Set background color to a pale grey f0f0f0, with a black border and 1 pixel 3D border effect
    c->setBackground(0xf0f0f0, 0x000000, 1);

    // Add a title to the chart using 16pt Arial Bold Italic font. The title text is white
    // (0xffffff) on a dark blue (000040) background
    c->addTitle("Chemical Concentration", "Arial Bold Italic", 16, 0xffffff)->setBackground(0x000040
        );

    // Set center of plot area at (200, 240) with radius 145 pixels. Set background color to blue
    // (9999ff)
    c->setPlotArea(200, 240, 145, 0x9999ff);

    // Color the region between radius = 40 to 80 as green (99ff99)
    c->radialAxis()->addZone(40, 80, 0x99ff99);

    // Color the region with radius > 80 as red (ff9999)
    c->radialAxis()->addZone(80, 999, 0xff9999);

    // Set the grid style to circular grid
    c->setGridStyle(false);

    // Set the radial axis label format
    c->radialAxis()->setLabelFormat("{value} ppm");

    // Use semi-transparent (40ffffff) label background so as not to block the data
    c->radialAxis()->setLabelStyle()->setBackground(0x40ffffff, 0x40000000);

    // Add a legend box at (200, 30) top center aligned, using 9pt Arial Bold font. with a black
    // border.
    LegendBox* legendBox = c->addLegend(200, 30, false, "Arial Bold", 9);
    legendBox->setAlignment(Chart::TopCenter);

    // Add legend keys to represent the red/green/blue zones
    legendBox->addKey("Under-Absorp", 0x9999ff);
    legendBox->addKey("Normal", 0x99ff99);
    legendBox->addKey("Over-Absorp", 0xff9999);

    // Add a blue (000080) spline line layer with line width set to 3 pixels and using yellow
    // (ffff00) circles to represent the data points
    PolarSplineLineLayer* layer = c->addSplineLineLayer(DoubleArray(data, data_size), 0x000080);
    layer->setLineWidth(3);
    layer->setDataSymbol(Chart::CircleShape, 11, 0xffff00);

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

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

    //free up resources
    delete c;

    return 0;
}