Polar Vector Chart

The following is the command line version of the code in "cppdemo/polarvector". 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[])
{
    // Coordinates of the starting points of the vectors
    double radius[] = {5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
        10, 10, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 20, 20, 20, 20, 20, 20, 20, 20, 20,
        20, 20, 20, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25};
    const int radius_size = (int)(sizeof(radius)/sizeof(*radius));
    double angle[] = {0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120,
        150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0,
        30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240,
        270, 300, 330};
    const int angle_size = (int)(sizeof(angle)/sizeof(*angle));

    // Magnitude and direction of the vectors
    double magnitude[] = {5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3,
        3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1,
        1, 1, 1, 1};
    const int magnitude_size = (int)(sizeof(magnitude)/sizeof(*magnitude));
    double direction[] = {60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150,
        180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30,
        60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 0, 30, 60, 90, 120, 150, 180, 210, 240, 270,
        300, 330, 0, 30};
    const int direction_size = (int)(sizeof(direction)/sizeof(*direction));

    // Create a PolarChart object of size 460 x 460 pixels
    PolarChart* c = new PolarChart(460, 460);

    // Add a title to the chart at the top left corner using 15pt Arial Bold Italic font
    c->addTitle("Polar Vector Chart Demonstration", "Arial Bold Italic", 15);

    // Set center of plot area at (230, 240) with radius 180 pixels
    c->setPlotArea(230, 240, 180);

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

    // Set angular axis as 0 - 360, with a spoke every 30 units
    c->angularAxis()->setLinearScale(0, 360, 30);

    // Add a polar vector layer to the chart with blue (0000ff) vectors
    c->addVectorLayer(DoubleArray(radius, radius_size), DoubleArray(angle, angle_size), DoubleArray(
        magnitude, magnitude_size), DoubleArray(direction, direction_size), Chart::RadialAxisScale,
        0x0000ff);

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

    //free up resources
    delete c;

    return 0;
}