Square Angular Meters

The following is the command line version of the code in "cppdemo/squareameter". 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"

void createChart(int chartIndex, const char *filename)
{
    // The value to display on the meter
    double value = 4.75;

    // Create an AugularMeter object of size 110 x 110 pixels, using silver background color with a
    // black 2 pixel 3D depressed border.
    AngularMeter* m = new AngularMeter(110, 110, Chart::silverColor(), 0x000000, -2);

    // Set meter appearance according to a parameter
    if (chartIndex == 0) {
        // Set the meter center at bottom left corner (15, 95), with radius 85 pixels. Meter spans
        // from 90 - 0 degrees.
        m->setMeter(15, 95, 85, 90, 0);
        // Add a label to the meter centered at (35, 75)
        m->addText(35, 75, "VDC", "Arial Bold", 12, Chart::TextColor, Chart::Center);
        // Add a text box to show the value at top right corner (103, 7)
        m->addText(103, 7, m->formatValue(value, "2"), "Arial", 8, 0xffffff, Chart::TopRight
            )->setBackground(0, 0, -1);
    } else if (chartIndex == 1) {
        // Set the meter center at top left corner (15, 15), with radius 85 pixels. Meter spans from
        // 90 - 180 degrees.
        m->setMeter(15, 15, 85, 90, 180);
        // Add a label to the meter centered at (35, 35)
        m->addText(35, 35, "AMP", "Arial Bold", 12, Chart::TextColor, Chart::Center);
        // Add a text box to show the value at bottom right corner (103, 103)
        m->addText(103, 103, m->formatValue(value, "2"), "Arial", 8, 0xffffff, Chart::BottomRight
            )->setBackground(0, 0, -1);
    } else if (chartIndex == 2) {
        // Set the meter center at top right corner (15, 95), with radius 85 pixels. Meter spans
        // from 270 - 180 degrees.
        m->setMeter(95, 15, 85, 270, 180);
        // Add a label to the meter centered at (75, 35)
        m->addText(75, 35, "KW", "Arial Bold", 12, Chart::TextColor, Chart::Center);
        // Add a text box to show the value at bottom left corner (7, 103)
        m->addText(7, 103, m->formatValue(value, "2"), "Arial", 8, 0xffffff, Chart::BottomLeft
            )->setBackground(0, 0, -1);
    } else {
        // Set the meter center at bottom right corner (95, 95), with radius 85 pixels. Meter spans
        // from 270 - 360 degrees.
        m->setMeter(95, 95, 85, 270, 360);
        // Add a label to the meter centered at (75, 75)
        m->addText(75, 75, "RPM", "Arial Bold", 12, Chart::TextColor, Chart::Center);
        // Add a text box to show the value at top left corner (7, 7)
        m->addText(7, 7, m->formatValue(value, "2"), "Arial", 8, 0xffffff, Chart::TopLeft
            )->setBackground(0, 0, -1);
    }

    // Meter scale is 0 - 10, with a major tick every 2 units, and minor tick every 1 unit
    m->setScale(0, 10, 2, 1);

    // Set 0 - 6 as green (99ff99) zone, 6 - 8 as yellow (ffff00) zone, and 8 - 10 as red (ff3333)
    // zone
    m->addZone(0, 6, 0x99ff99, 0x808080);
    m->addZone(6, 8, 0xffff00, 0x808080);
    m->addZone(8, 10, 0xff3333, 0x808080);

    // Add a semi-transparent black (80000000) pointer at the specified value
    m->addPointer(value, 0x80000000);

    // Output the chart
    m->makeChart(filename);

    //free up resources
    delete m;

}

int main(int argc, char *argv[])
{
    createChart(0, "squareameter0.png");
    createChart(1, "squareameter1.png");
    createChart(2, "squareameter2.png");
    createChart(3, "squareameter3.png");
    return 0;
}