Square Angular Meters

perldemo\squareameter.pl
#!/usr/bin/perl

# The ChartDirector for Perl module is assumed to be in "../lib"
use File::Basename;
use lib (dirname($0)."/../lib") =~ /(.*)/;

use perlchartdir;

sub createChart
{
    my $chartIndex = shift;

    # The value to display on the meter
    my $value = 4.75;

    # Create an AugularMeter object of size 110 x 110 pixels, using silver background color with a
    # black 2 pixel 3D depressed border.
    my $m = new AngularMeter(110, 110, perlchartdir::silverColor(), 0x000000, -2);

    # Set meter appearance according to a parameter
    if ($chartIndex == 0) {
        # Set the meter center at bottom left corner (15, 95), with radius 85 pixels. Meter spans
        # from 90 - 0 degrees.
        $m->setMeter(15, 95, 85, 90, 0);
        # Add a label to the meter centered at (35, 75)
        $m->addText(35, 75, "VDC", "Arial Bold", 12, $perlchartdir::TextColor, $perlchartdir::Center
            );
        # Add a text box to show the value at top right corner (103, 7)
        $m->addText(103, 7, $m->formatValue($value, "2"), "Arial", 8, 0xffffff,
            $perlchartdir::TopRight)->setBackground(0, 0, -1);
    } elsif ($chartIndex == 1) {
        # Set the meter center at top left corner (15, 15), with radius 85 pixels. Meter spans from
        # 90 - 180 degrees.
        $m->setMeter(15, 15, 85, 90, 180);
        # Add a label to the meter centered at (35, 35)
        $m->addText(35, 35, "AMP", "Arial Bold", 12, $perlchartdir::TextColor, $perlchartdir::Center
            );
        # Add a text box to show the value at bottom right corner (103, 103)
        $m->addText(103, 103, $m->formatValue($value, "2"), "Arial", 8, 0xffffff,
            $perlchartdir::BottomRight)->setBackground(0, 0, -1);
    } elsif ($chartIndex == 2) {
        # Set the meter center at top right corner (15, 95), with radius 85 pixels. Meter spans from
        # 270 - 180 degrees.
        $m->setMeter(95, 15, 85, 270, 180);
        # Add a label to the meter centered at (75, 35)
        $m->addText(75, 35, "KW", "Arial Bold", 12, $perlchartdir::TextColor, $perlchartdir::Center)
            ;
        # Add a text box to show the value at bottom left corner (7, 103)
        $m->addText(7, 103, $m->formatValue($value, "2"), "Arial", 8, 0xffffff,
            $perlchartdir::BottomLeft)->setBackground(0, 0, -1);
    } else {
        # Set the meter center at bottom right corner (95, 95), with radius 85 pixels. Meter spans
        # from 270 - 360 degrees.
        $m->setMeter(95, 95, 85, 270, 360);
        # Add a label to the meter centered at (75, 75)
        $m->addText(75, 75, "RPM", "Arial Bold", 12, $perlchartdir::TextColor, $perlchartdir::Center
            );
        # Add a text box to show the value at top left corner (7, 7)
        $m->addText(7, 7, $m->formatValue($value, "2"), "Arial", 8, 0xffffff, $perlchartdir::TopLeft
            )->setBackground(0, 0, -1);
    }

    # Meter scale is 0 - 10, with a major tick every 2 units, and minor tick every 1 unit
    $m->setScale(0, 10, 2, 1);

    # Set 0 - 6 as green (99ff99) zone, 6 - 8 as yellow (ffff00) zone, and 8 - 10 as red (ff3333)
    # zone
    $m->addZone(0, 6, 0x99ff99, 0x808080);
    $m->addZone(6, 8, 0xffff00, 0x808080);
    $m->addZone(8, 10, 0xff3333, 0x808080);

    # Add a semi-transparent black (80000000) pointer at the specified value
    $m->addPointer($value, 0x80000000);

    # Output the chart
    $m->makeChart("squareameter$chartIndex.png");
}

createChart(0);
createChart(1);
createChart(2);
createChart(3);