ChartDirector 6.0 (C++ Edition)

Color Vertical Bar Meters


          

This example demonstrates horizontal bar meters in various colors, with different color scales, and with title and value readout.

BaseMeter.addColorScale is used to create the color scales in the meters. The color scales are created with various colors, end point positions and widths at the end points.

The title and value readout are created as TextBox objects using BaseChart.addTitle and BaseChart.addTitle2, with the text box background set to the same color as that of the chart border.

Source Code Listing

[The following code is available in "cppdemo/colorvbarmeter". 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 = 66.77;

    // The background, border and bar colors of the meters
    int bgColor[] = {0xcce4ff, 0xccffcc, 0xffdddd, 0xffffaa, 0xffccff, 0xeeeeee};
    int borderColor[] = {0x000088, 0x006600, 0x880000, 0xee6600, 0x6600aa, 0x666666};
    int barColor[] = {0x2299ff, 0x00ee00, 0xee4455, 0xff8800, 0x8833dd, 0x888888};

    // Create a LinearMeter object of size 70 x 260 pixels with a 3-pixel thick rounded frame
    LinearMeter *m = new LinearMeter(70, 260, bgColor[chartIndex], borderColor[chartIndex]);
    m->setRoundedFrame(Chart::Transparent);
    m->setThickFrame(3);

    // Set the scale region top-left corner at (28, 33), with size of 20 x 194 pixels. The scale
    // labels are located on the left (default - implies vertical meter).
    m->setMeter(28, 33, 20, 194);

    // 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, 0x33ff33, 50, 0xffff00, 80, 0xff3333, 100};
    double highLowColorScale[] = {0, 0x0000ff, 40, Chart::Transparent, 60, Chart::Transparent, 100,
        0xff0000};
    double highColorScale[] = {70, Chart::Transparent, 100, 0xff0000};
    double lowColorScale[] = {0, 0x0000ff, 30, Chart::Transparent};

    if (chartIndex == 0) {
        // Add a 6-pixel thick smooth color scale at x = 53 (right of meter scale)
        m->addColorScale(DoubleArray(smoothColorScale, (int)(sizeof(smoothColorScale) / sizeof(
            smoothColorScale[0]))), 53, 6);
    } else if (chartIndex == 1) {
        // Add a high only color scale at x = 52 (right of meter scale) with thickness varying from
        // 0 to 8
        m->addColorScale(DoubleArray(highColorScale, (int)(sizeof(highColorScale) / sizeof(
            highColorScale[0]))), 52, 0, 52, 8);
        // Add a low only color scale at x = 52 (right of meter scale) with thickness varying from 8
        // to 0
        m->addColorScale(DoubleArray(lowColorScale, (int)(sizeof(lowColorScale) / sizeof(
            lowColorScale[0]))), 52, 8, 52, 0);
    } else if (chartIndex == 2) {
        // Add a high only color scale at x = 52 (right of meter scale) with thickness varying from
        // 0 to 8
        m->addColorScale(DoubleArray(highColorScale, (int)(sizeof(highColorScale) / sizeof(
            highColorScale[0]))), 52, 0, 52, 8);
    } else if (chartIndex == 3) {
        // Add a smooth color scale at x = 52 (right of meter scale) with thickness varying from 0
        // to 8
        m->addColorScale(DoubleArray(smoothColorScale, (int)(sizeof(smoothColorScale) / sizeof(
            smoothColorScale[0]))), 52, 0, 52, 8);
    } else if (chartIndex == 4) {
        // Add a 6-pixel thick high/low color scale at x = 53 (right of meter scale)
        m->addColorScale(DoubleArray(highLowColorScale, (int)(sizeof(highLowColorScale) / sizeof(
            highLowColorScale[0]))), 53, 6);
    } else {
        // Add a 6-pixel thick step color scale at x = 53 (right of meter scale)
        m->addColorScale(DoubleArray(stepColorScale, (int)(sizeof(stepColorScale) / sizeof(
            stepColorScale[0]))), 53, 6);
    }

    // Add a bar from 0 to value with glass effect and 4 pixel rounded corners
    m->addBar(0, value, barColor[chartIndex], Chart::glassEffect(Chart::NormalGlare, Chart::Left), 4
        );

    // Add a title using white (0xffffff) 8pt Arial Bold font with a border color background
    m->addTitle("Temp C", "arialbd.ttf", 8, 0xffffff)->setBackground(borderColor[chartIndex]);

    // Add a bottom title using white (0xffffff) 8pt Arial Bold font with a border color background
    // to display the value
    m->addTitle(Chart::Bottom, m->formatValue(value, "2"), "arialbd.ttf", 8, 0xffffff
        )->setBackground(borderColor[chartIndex]);

    // Output the chart
    m->makeChart(filename);

    //free up resources
    delete m;
}

int main(int argc, char *argv[])
{
    createChart(0, "colorvbarmeter0.png");
    createChart(1, "colorvbarmeter1.png");
    createChart(2, "colorvbarmeter2.png");
    createChart(3, "colorvbarmeter3.png");
    createChart(4, "colorvbarmeter4.png");
    createChart(5, "colorvbarmeter5.png");
    return 0;
}