Multi Radar Chart

This example demonstrates a radar chart with two layers and a number of chart formatting effects.

Create a PolarChart object using PolarChart.PolarChart, using a golden color created with Chart::goldColor as the background color.
Add a title to the chart with white text on a deep blue background using BaseChart.addTitle.
Specify the polar plot area of the chart using PolarChart.setPlotArea.
Add a legend box to the chart using BaseChart.addLegend. Set the legend box background to silver with 3D border effect using Box.setBackground. The silver color is created using Chart::silverColor.
Add two polar area layers using PolarChart.addAreaLayer. Use semi-transparent colors as the area fill colors to avoid the top layer blocking the bottom layer.
Add two polar line layers with PolarChart.addLineLayer, using the same data as the polar area layer. Set a thick line width using PolarLayer.setLineWidth. The line layers becomes borders of the area layers to highlight the areas.
Specify the labels on the angular axis using AngularAxis.setLabels.
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/multiradar". 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[] = {90, 60, 85, 75, 55};
    const int data0_size = (int)(sizeof(data0)/sizeof(*data0));
    double data1[] = {60, 80, 70, 80, 85};
    const int data1_size = (int)(sizeof(data1)/sizeof(*data1));

    // 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 480 x 380 pixels. Set background color to gold, with 1
    // pixel 3D border effect
    PolarChart* c = new PolarChart(480, 380, Chart::goldColor(), 0x000000, 1);

    // Add a title to the chart using 15pt Times Bold Italic font. The title text is white (ffffff)
    // on a deep blue (000080) background
    c->addTitle("Space Travel Vehicles Compared", "Times New Roman Bold Italic", 15, 0xffffff
        )->setBackground(0x000080);

    // Set plot area center at (240, 210), with 150 pixels radius, and a white (ffffff) background.
    c->setPlotArea(240, 210, 150, 0xffffff);

    // Add a legend box at top right corner (470, 35) using 10pt Arial Bold font. Set the background
    // to silver, with 1 pixel 3D border effect.
    LegendBox* b = c->addLegend(470, 35, true, "Arial Bold", 10);
    b->setAlignment(Chart::TopRight);
    b->setBackground(Chart::silverColor(), Chart::Transparent, 1);

    // Add an area layer to the chart using semi-transparent blue (0x806666cc). Add a blue
    // (0x6666cc) line layer using the same data with 3 pixel line width to highlight the border of
    // the area.
    c->addAreaLayer(DoubleArray(data0, data0_size), 0x806666cc, "Model Saturn");
    c->addLineLayer(DoubleArray(data0, data0_size), 0x6666cc)->setLineWidth(3);

    // Add an area layer to the chart using semi-transparent red (0x80cc6666). Add a red (0xcc6666)
    // line layer using the same data with 3 pixel line width to highlight the border of the area.
    c->addAreaLayer(DoubleArray(data1, data1_size), 0x80cc6666, "Model Jupiter");
    c->addLineLayer(DoubleArray(data1, data1_size), 0xcc6666)->setLineWidth(3);

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

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

    //free up resources
    delete c;

    return 0;
}