Linear Zone Meter

The following is the command line version of the code in "cppdemo/linearzonemeter". 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 value to display on the meter
    double value = 85;

    // Create an LinearMeter object of size 210 x 45 pixels, using silver background with a 2 pixel
    // black 3D depressed border.
    LinearMeter* m = new LinearMeter(210, 45, Chart::silverColor(), 0, -2);

    // Set the scale region top-left corner at (5, 5), with size of 200 x 20 pixels. The scale
    // labels are located on the bottom (implies horizontal meter)
    m->setMeter(5, 5, 200, 20, Chart::Bottom);

    // Set meter scale from 0 - 100
    m->setScale(0, 100);

    // Add a title at the bottom of the meter with a 1 pixel raised 3D border
    m->addTitle(Chart::Bottom, "Battery Level", "Arial Bold", 8)->setBackground(Chart::Transparent,
        -1, 1);

    // Set 3 zones of different colors to represent Good/Weak/Bad data ranges
    m->addZone(50, 100, 0x99ff99, "Good");
    m->addZone(20, 50, 0xffff66, "Weak");
    m->addZone(0, 20, 0xffcccc, "Bad");

    // Add empty labels (just need the ticks) at 0/20/50/80 as separators for zones
    m->addLabel(0, " ");
    m->addLabel(20, " ");
    m->addLabel(50, " ");
    m->addLabel(100, " ");

    // Add a semi-transparent blue (800000ff) pointer at the specified value, using triangular
    // pointer shape
    m->addPointer(value, 0x800000ff)->setShape(Chart::TriangularPointer);

    // Output the chart
    m->makeChart("linearzonemeter.png");

    //free up resources
    delete m;

    return 0;
}