ChartDirector 7.1 (C++ Edition)

Multi-Pointer Horizontal Meter




This example demonstrates a horizontal linear meter with multiple pointers.

Source Code Listing

The following is the command line version of the code in "cppdemo/multihmeter". 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 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", "Arial Bold", 8, 0xc00000, Chart::BottomLeft); // Add three text boxes to show the values in this meter m->addText(148, 70, m->formatValue(value0, "2"), "Arial", 8, 0x6666ff, Chart::BottomRight )->setBackground(0, 0, -1); m->addText(193, 70, m->formatValue(value1, "2"), "Arial", 8, 0x33ff33, Chart::BottomRight )->setBackground(0, 0, -1); m->addText(238, 70, m->formatValue(value2, "2"), "Arial", 8, 0xff3333, Chart::BottomRight )->setBackground(0, 0, -1); // Output the chart m->makeChart("multihmeter.png"); //free up resources delete m; return 0; }