Polar Area Chart

The following is the command line version of the code in "cppdemo/polararea". 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[])
{
    // Data for the chart
    double data0[] = {5, 3, 10, 4, 3, 5, 2, 5};
    const int data0_size = (int)(sizeof(data0)/sizeof(*data0));
    double data1[] = {12, 6, 17, 6, 7, 9, 4, 7};
    const int data1_size = (int)(sizeof(data1)/sizeof(*data1));
    double data2[] = {17, 7, 22, 7, 18, 13, 5, 11};
    const int data2_size = (int)(sizeof(data2)/sizeof(*data2));

    const char* labels[] = {"North", "North<*br*>East", "East", "South<*br*>East", "South",
        "South<*br*>West", "West", "North<*br*>West"};
    const int labels_size = (int)(sizeof(labels)/sizeof(*labels));

    // Create a PolarChart object of size 460 x 500 pixels, with a grey (e0e0e0) background and 1
    // pixel 3D border
    PolarChart* c = new PolarChart(460, 500, 0xe0e0e0, 0x000000, 1);

    // Add a title to the chart at the top left corner using 15pt Arial Bold Italic font. Use a wood
    // pattern as the title background.
    c->addTitle("Polar Area Chart Demo", "Arial Bold Italic", 15)->setBackground(c->patternColor(
        "wood.png"));

    // Set center of plot area at (230, 280) with radius 180 pixels, and white (ffffff) background.
    c->setPlotArea(230, 280, 180, 0xffffff);

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

    // Add a legend box at top-center of plot area (230, 35) using horizontal layout. Use 10pt Arial
    // Bold font, with 1 pixel 3D border effect.
    LegendBox* b = c->addLegend(230, 35, false, "Arial Bold", 9);
    b->setAlignment(Chart::TopCenter);
    b->setBackground(Chart::Transparent, Chart::Transparent, 1);

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

    // Specify the label format for the radial axis
    c->radialAxis()->setLabelFormat("{value}%");

    // Set radial axis label background to semi-transparent grey (40cccccc)
    c->radialAxis()->setLabelStyle()->setBackground(0x40cccccc, 0);

    // Add the data as area layers
    c->addAreaLayer(DoubleArray(data2, data2_size), -1, "5 m/s or above");
    c->addAreaLayer(DoubleArray(data1, data1_size), -1, "1 - 5 m/s");
    c->addAreaLayer(DoubleArray(data0, data0_size), -1, "less than 1 m/s");

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

    //free up resources
    delete c;

    return 0;
}