ChartDirector 6.0 (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 code is available in "cppdemo/whitehbarmeter". 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"

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};
    double stepColorScale[] = {0, 0x00dd00, 50, 0xffff00, 80, 0xff0000, 100};
    double highLowColorScale[] = {0, 0x0000ff, 40, Chart::Transparent, 60, Chart::Transparent, 100,
        0xff0000};
    double highColorScale[] = {70, Chart::Transparent, 100, 0xff0000};

    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, (int)(sizeof(smoothColorScale) / sizeof(
            smoothColorScale[0]))), 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, (int)(sizeof(stepColorScale) / sizeof(
            stepColorScale[0]))), 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, (int)(sizeof(highLowColorScale) / sizeof(
            highLowColorScale[0]))), 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, (int)(sizeof(highColorScale) / sizeof(
            highColorScale[0]))), 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, (int)(sizeof(smoothColorScale) / sizeof(
            smoothColorScale[0]))), 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, (int)(sizeof(stepColorScale) / sizeof(
            stepColorScale[0]))), 48, 5);
    }

    // Add a label right aligned to (243, 65) using 8pt Arial Bold font
    m->addText(243, 65, "Temperature C", "arialbd.ttf", 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.ttf", 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;
}