ChartDirector 6.0 (C++ Edition)

H-Linear Meter Orientation


      

This example demonstrates horizontal linear meters in different orientations.

In a horizontal linear meter, the scale labels can be positioned above the meter scale or below it. This is controlled by the last argument to LinearMeter.setMeter, which can be Top or Bottom,

The title and value readout added using BaseChart.addText can be put at any position. In this example, we put them at the opposite side to the scale labels.

Source Code Listing

[The following code is available in "cppdemo/hlinearmeterorientation". 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 = 74.25;

    // Create a LinearMeter object of size 250 x 75 pixels with very light grey (0xeeeeee)
    // backgruond and a light grey (0xccccccc) 3-pixel thick rounded frame
    LinearMeter *m = new LinearMeter(250, 75, 0xeeeeee, 0xcccccc);
    m->setRoundedFrame(Chart::Transparent);
    m->setThickFrame(3);

    // This example demonstrates putting the text labels at the top or bottom. This is by setting
    // the label alignment, scale position and label position.
    int alignment[] = {Chart::Top, Chart::Top, Chart::Bottom, Chart::Bottom};
    int meterYPos[] = {23, 23, 34, 34};
    int labelYPos[] = {61, 61, 15, 15};

    // Set the scale region
    m->setMeter(14, meterYPos[chartIndex], 218, 20, alignment[chartIndex]);

    // Set meter scale from 0 - 100, with a tick every 10 units
    m->setScale(0, 100, 10);

    // Add a smooth color scale at the default position
    double smoothColorScale[] = {0, 0x6666ff, 25, 0x00bbbb, 50, 0x00ff00, 75, 0xffff00, 100,
        0xff0000};
    m->addColorScale(DoubleArray(smoothColorScale, (int)(sizeof(smoothColorScale) / sizeof(
        smoothColorScale[0]))));

    // Add a blue (0x0000cc) pointer at the specified value
    m->addPointer(value, 0x0000cc);

    //
    // In this example, some charts have the "Temperauture" label on the left side and the value
    // readout on the right side, and some charts have the reverse
    //

    if (chartIndex % 2 == 0) {
        // Add a label on the left side using 8pt Arial Bold font
        m->addText(10, labelYPos[chartIndex], "Temperature C", "arialbd.ttf", 8, Chart::TextColor,
            Chart::Left);

        // Add a text box on the right side. Display the value using white (0xffffff) 8pt Arial Bold
        // font on a black (0x000000) background with depressed rounded border.
        TextBox *t = m->addText(235, labelYPos[chartIndex], m->formatValue(value, "2"),
            "arialbd.ttf", 8, 0xffffff, Chart::Right);
        t->setBackground(0x000000, 0x000000, -1);
        t->setRoundedCorners(3);
    } else {
        // Add a label on the right side using 8pt Arial Bold font
        m->addText(237, labelYPos[chartIndex], "Temperature C", "arialbd.ttf", 8, Chart::TextColor,
            Chart::Right);

        // Add a text box on the left side. Display the value using white (0xffffff) 8pt Arial Bold
        // font on a black (0x000000) background with depressed rounded border.
        TextBox *t = m->addText(11, labelYPos[chartIndex], m->formatValue(value, "2"),
            "arialbd.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, "hlinearmeterorientation0.png");
    createChart(1, "hlinearmeterorientation1.png");
    createChart(2, "hlinearmeterorientation2.png");
    createChart(3, "hlinearmeterorientation3.png");
    return 0;
}