Simple Radar Chart

This example demonstrates the basic steps in creating radar charts.

Create a PolarChart object using PolarChart.PolarChart.
Specify the polar plot area of the chart using PolarChart.setPlotArea.
Add a polar area layer and specify the data for the area using PolarChart.addAreaLayer.
Specify the labels on the angular axis using AngularAxis.setLabels. In a polar/radar chart, the radial axis refers to the axis from the center to the perimeter of the plot area, and the angular axis refers to the axis lying on the perimeter of the plot area.
Pass the chart to the CChartViewer for display using CChartViewer.setChart (MFC version) or QChartViewer.setChart (Qt version), or generate the chart as an image file using BaseChart.makeChart (Command Line version).
Generate tool tips for the chart using BaseChart.getHTMLImageMap. (MFC/Qt version)

The following is the command line version of the code in "cppdemo/simpleradar". 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[] = {90, 60, 65, 75, 40};
    const int data_size = (int)(sizeof(data)/sizeof(*data));

    // The labels for the chart
    const char* labels[] = {"Speed", "Reliability", "Comfort", "Safety", "Efficiency"};
    const int labels_size = (int)(sizeof(labels)/sizeof(*labels));

    // Create a PolarChart object of size 450 x 350 pixels
    PolarChart* c = new PolarChart(450, 350);

    // Set center of plot area at (225, 185) with radius 150 pixels
    c->setPlotArea(225, 185, 150);

    // Add an area layer to the polar chart
    c->addAreaLayer(DoubleArray(data, data_size), 0x9999ff);

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

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

    //free up resources
    delete c;

    return 0;
}