ChartDirector 7.1 (C++ Edition)

White Horizontal Bar Meters


          

This example demonstrates horizontal bar meters in a white coloring scheme, and with bars in various shading styles.

Source Code Listing

The following is the command line version of the code in "cppdemo/whitehbarmeter". 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 = 75.35; // Create a LinearMeter object of size 260 x 80 pixels with very light grey (0xeeeeee) // backgruond and a light grey (0xccccccc) 3-pixel thick rounded frame LinearMeter* m = new LinearMeter(260, 80, 0xeeeeee, 0xaaaaaa); m->setRoundedFrame(Chart::Transparent); m->setThickFrame(3); // Set the scale region top-left corner at (18, 24), with size of 222 x 20 pixels. The scale // labels are located on the top (implies horizontal meter) m->setMeter(18, 24, 222, 20, Chart::Top); // Set meter scale from 0 - 100, with a tick every 10 units m->setScale(0, 100, 10); // Demostrate different types of color scales double smoothColorScale[] = {0, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000}; const int smoothColorScale_size = (int)(sizeof(smoothColorScale)/sizeof(*smoothColorScale)); double stepColorScale[] = {0, 0x00dd00, 50, 0xffff00, 80, 0xff0000, 100}; const int stepColorScale_size = (int)(sizeof(stepColorScale)/sizeof(*stepColorScale)); double highLowColorScale[] = {0, 0x0000ff, 40, Chart::Transparent, 60, Chart::Transparent, 100, 0xff0000}; const int highLowColorScale_size = (int)(sizeof(highLowColorScale)/sizeof(*highLowColorScale)); double highColorScale[] = {70, Chart::Transparent, 100, 0xff0000}; const int highColorScale_size = (int)(sizeof(highColorScale)/sizeof(*highColorScale)); if (chartIndex == 0) { // Add a blue (0x0088ff) bar from 0 to value with glass effect and 4 pixel rounded corners m->addBar(0, value, 0x0088ff, Chart::glassEffect(Chart::NormalGlare, Chart::Top), 4); // Add a 5-pixel thick smooth color scale at y = 48 (below the meter scale) m->addColorScale(DoubleArray(smoothColorScale, smoothColorScale_size), 48, 5); } else if (chartIndex == 1) { // Add a green (0x00cc00) bar from 0 to value with bar lighting effect m->addBar(0, value, 0x00cc00, Chart::barLighting()); // Add a 5-pixel thick step color scale at y = 48 (below the meter scale) m->addColorScale(DoubleArray(stepColorScale, stepColorScale_size), 48, 5); } else if (chartIndex == 2) { // Add a purple (0x8833dd) bar from 0 to value with glass effect and 4 pixel rounded corners m->addBar(0, value, 0x8833dd, Chart::glassEffect(Chart::NormalGlare, Chart::Top), 4); // Add a 5-pixel thick high/low color scale at y = 48 (below the meter scale) m->addColorScale(DoubleArray(highLowColorScale, highLowColorScale_size), 48, 5); } else if (chartIndex == 3) { // Add an orange (0xff8800) bar from 0 to value with cylinder lighting effect m->addBar(0, value, 0xff8800, Chart::cylinderEffect()); // Add a high only color scale at y = 48 (below the meter scale) with thickness varying from // 0 to 8 m->addColorScale(DoubleArray(highColorScale, highColorScale_size), 48, 0, 48, 8); } else if (chartIndex == 4) { // Add a red (0xee3333) bar from 0 to value with glass effect and 4 pixel rounded corners m->addBar(0, value, 0xee3333, Chart::glassEffect(Chart::NormalGlare, Chart::Top), 4); // Add a 5-pixel thick smooth color scale at y = 48 (below the meter scale) m->addColorScale(DoubleArray(smoothColorScale, smoothColorScale_size), 48, 5); } else { // Add a grey (0xaaaaaa) bar from 0 to value m->addBar(0, value, 0xaaaaaa); // Add a 5-pixel thick step color scale at y = 48 (below the meter scale) m->addColorScale(DoubleArray(stepColorScale, stepColorScale_size), 48, 5); } // Add a label right aligned to (243, 65) using 8pt Arial Bold font m->addText(243, 65, "Temperature C", "Arial Bold", 8, Chart::TextColor, Chart::Right); // Add a text box left aligned to (18, 65). Display the value using white (0xffffff) 8pt Arial // Bold font on a black (0x000000) background with depressed rounded border. TextBox* t = m->addText(18, 65, m->formatValue(value, "2"), "Arial", 8, 0xffffff, Chart::Left); t->setBackground(0x000000, 0x000000, -1); t->setRoundedCorners(3); // Output the chart m->makeChart(filename); //free up resources delete m; } int main(int argc, char *argv[]) { createChart(0, "whitehbarmeter0.png"); createChart(1, "whitehbarmeter1.png"); createChart(2, "whitehbarmeter2.png"); createChart(3, "whitehbarmeter3.png"); createChart(4, "whitehbarmeter4.png"); createChart(5, "whitehbarmeter5.png"); return 0; }