ChartDirector 7.1 (C++ Edition)

Black Vertical Linear Meters


          

This example demonstrates vertical bar meters in a black coloring scheme.

Source Code Listing

The following is the command line version of the code in "cppdemo/blackvlinearmeter". 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 = 74.25; // Create a LinearMeter object of size 70 x 260 pixels with black background and rounded corners LinearMeter* m = new LinearMeter(70, 260, 0x000000); m->setRoundedFrame(Chart::Transparent); // Set the default text and line colors to white (0xffffff) m->setColor(Chart::TextColor, 0xffffff); m->setColor(Chart::LineColor, 0xffffff); // Set the scale region top-left corner at (28, 30), with size of 20 x 196 pixels. The scale // labels are located on the left (default - implies vertical meter) m->setMeter(28, 30, 20, 196); // Set meter scale from 0 - 100, with a tick every 10 units m->setScale(0, 100, 10); // The tick line width to 1 pixel m->setLineWidth(0, 1); // Demostrate different types of color scales and putting them at different positions double smoothColorScale[] = {0, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000}; const int smoothColorScale_size = (int)(sizeof(smoothColorScale)/sizeof(*smoothColorScale)); double stepColorScale[] = {0, 0x00cc00, 50, 0xeecc00, 80, 0xdd0000, 100}; const int stepColorScale_size = (int)(sizeof(stepColorScale)/sizeof(*stepColorScale)); double highLowColorScale[] = {0, 0x0000ff, 70, Chart::Transparent, 100, 0xff0000}; const int highLowColorScale_size = (int)(sizeof(highLowColorScale)/sizeof(*highLowColorScale)); if (chartIndex == 0) { // Add the smooth color scale at the default position m->addColorScale(DoubleArray(smoothColorScale, smoothColorScale_size)); } else if (chartIndex == 1) { // Add the step color scale at the default position m->addColorScale(DoubleArray(stepColorScale, stepColorScale_size)); } else if (chartIndex == 2) { // Add the high low scale at the default position m->addColorScale(DoubleArray(highLowColorScale, highLowColorScale_size)); } else if (chartIndex == 3) { // Add the smooth color scale starting at x = 28 (left of scale) with zero width and ending // at x = 28 with 20 pixels width m->addColorScale(DoubleArray(smoothColorScale, smoothColorScale_size), 28, 0, 28, 20); } else if (chartIndex == 4) { // Add the smooth color scale starting at x = 38 (center of scale) with zero width and // ending at x = 28 with 20 pixels width m->addColorScale(DoubleArray(smoothColorScale, smoothColorScale_size), 38, 0, 28, 20); } else { // Add the smooth color scale starting at x = 48 (right of scale) with zero width and ending // at x = 28 with 20 pixels width m->addColorScale(DoubleArray(smoothColorScale, smoothColorScale_size), 48, 0, 28, 20); } // Add a blue (0x0000cc) pointer with white (0xffffff) border at the specified value m->addPointer(value, 0x0000cc, 0xffffff); // Add a label at the top-center using 8pt Arial Bold font m->addText(m->getWidth() / 2, 5, "Temp C", "Arial Bold", 8, Chart::TextColor, Chart::Top); // Add a text box at the bottom-center. Display the value using white (0xffffff) 8pt Arial Bold // font on a black (0x000000) background with depressed grey (0x444444) rounded border. TextBox* t = m->addText(m->getWidth() / 2, m->getHeight() - 7, m->formatValue(value, "2"), "Arial Bold", 8, 0xffffff, Chart::Bottom); t->setBackground(0x000000, 0x444444, -1); t->setRoundedCorners(3); // Output the chart m->makeChart(filename); //free up resources delete m; } int main(int argc, char *argv[]) { createChart(0, "blackvlinearmeter0.png"); createChart(1, "blackvlinearmeter1.png"); createChart(2, "blackvlinearmeter2.png"); createChart(3, "blackvlinearmeter3.png"); createChart(4, "blackvlinearmeter4.png"); createChart(5, "blackvlinearmeter5.png"); return 0; }