#!/usr/bin/perl

# Include current script directory in the module path (needed on Microsoft IIS).
# This allows this script to work by copying ChartDirector to the same directory
# as the script (as an alternative to installation in Perl module directory)
use File::Basename;
use lib dirname($0) =~ /(.*)/;

use perlchartdir;

# Get HTTP query parameters
use CGI;
my $query = new CGI;

# 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 ($query->param("img") eq "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", "arialbd.ttf", 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.ttf", 8, 0xffffff,
        $perlchartdir::TopRight)->setBackground(0, 0, -1);
} elsif ($query->param("img") eq "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", "arialbd.ttf", 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.ttf", 8, 0xffffff,
        $perlchartdir::BottomRight)->setBackground(0, 0, -1);
} elsif ($query->param("img") eq "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", "arialbd.ttf", 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.ttf", 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", "arialbd.ttf", 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.ttf", 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
binmode(STDOUT);
print "Content-type: image/png\n\n";
print $m->makeChart2($perlchartdir::PNG);