ChartDirector 6.0 (C++ Edition)

Multi-Pointer Horizontal Meter




This example demonstrates a horizontal linear meter with multiple pointers.

Source Code Listing

[The following code is available in "cppdemo/multihmeter". A MFC version of the code is available in "mfcdemo/mfcdemo" (Windows edition only). A QT version of the code is available in "qtdemo/qtdemo".]
#include "chartdir.h"

int main(int argc, char *argv[])
{
    // The values to display on the meter
    double value0 = 30.99;
    double value1 = 45.35;
    double value2 = 77.64;

    // Create an LinearMeter object of size 250 x 75 pixels, using silver background with a 2 pixel
    // black 3D depressed border.
    LinearMeter *m = new LinearMeter(250, 75, Chart::silverColor(), 0, -2);

    // Set the scale region top-left corner at (15, 25), with size of 220 x 20 pixels. The scale
    // labels are located on the top (implies horizontal meter)
    m->setMeter(15, 25, 220, 20, Chart::Top);

    // Set meter scale from 0 - 100, with a tick every 10 units
    m->setScale(0, 100, 10);

    // Set 0 - 50 as green (99ff99) zone, 50 - 80 as yellow (ffff66) zone, and 80 - 100 as red
    // (ffcccc) zone
    m->addZone(0, 50, 0x99ff99);
    m->addZone(50, 80, 0xffff66);
    m->addZone(80, 100, 0xffcccc);

    // Add deep red (000080), deep green (008000) and deep blue (800000) pointers to reflect the
    // values
    m->addPointer(value0, 0x000080);
    m->addPointer(value1, 0x008000);
    m->addPointer(value2, 0x800000);

    // Add a label at bottom-left (10, 68) using Arial Bold/8pt/red (c00000)
    m->addText(10, 68, "Temp C", "arialbd.ttf", 8, 0xc00000, Chart::BottomLeft);

    // Add three text boxes to show the values in this meter
    m->addText(148, 70, m->formatValue(value0, "2"), "arial.ttf", 8, 0x6666ff, Chart::BottomRight
        )->setBackground(0, 0, -1);
    m->addText(193, 70, m->formatValue(value1, "2"), "arial.ttf", 8, 0x33ff33, Chart::BottomRight
        )->setBackground(0, 0, -1);
    m->addText(238, 70, m->formatValue(value2, "2"), "arial.ttf", 8, 0xff3333, Chart::BottomRight
        )->setBackground(0, 0, -1);

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

    //free up resources
    delete m;
    return 0;
}