Sector Zones

The following is the command line version of the code in "cppdemo/polarzones2". 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[] = {5.1, 1.5, 5.1, 4.0, 1.7, 8.7, 9.4, 2.1, 3.5, 8.8, 5.0, 6.0};
    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. with a metallic blue (9999ff) background
    // color and 1 pixel 3D border
    PolarChart* c = new PolarChart(400, 420, Chart::metalColor(0x9999ff), 0x000000, 1);

    // Add a title to the chart using 16pt Arial Bold Italic font. The title text is white
    // (0xffffff) on deep blue (000080) background
    c->addTitle("Chemical Concentration", "Arial Bold Italic", 16, 0xffffff)->setBackground(0x000080
        );

    // Set center of plot area at (200, 240) with radius 145 pixels. Set background color to green
    // (0x33ff33)
    c->setPlotArea(200, 240, 145, 0x33ff33);

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

    // Color the sector between label index = 5.5 to 7.5 as red (ff3333) zone
    c->angularAxis()->addZone(5.5, 7.5, 0xff3333);

    // Color the sector between label index = 4.5 to 5.5, and also between 7.5 to 8.5, as yellow
    // (ff3333) zones
    c->angularAxis()->addZone(4.5, 5.5, 0xffff00);
    c->angularAxis()->addZone(7.5, 8.5, 0xffff00);

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

    // 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/yellow/green zones
    legendBox->addKey("Very Dry", 0xff3333);
    legendBox->addKey("Critical", 0xffff00);
    legendBox->addKey("Moderate", 0x33ff33);

    // Add a blue (0x80) line layer with line width set to 3 pixels and use purple (ff00ff) cross
    // symbols for the data points
    PolarLineLayer* layer = c->addLineLayer(DoubleArray(data, data_size), 0x000080);
    layer->setLineWidth(3);
    layer->setDataSymbol(Chart::Cross2Shape(), 15, 0xff00ff);

    // Output the chart
    c->makeChart("polarzones2.png");

    //free up resources
    delete c;

    return 0;
}