ChartDirector Ver 5.0 (Perl Edition)

Multi-Pointer Vertical Meter




This example demonstrates a vertical linear meter with multiple pointers.

ChartDirector supports adding arbitrary number of pointers to a meter using BaseMeter.addPointer. The shape of each pointer is configurable by using MeterPointer.setShape or MeterPointer.setShape2.

Source Code Listing

[Standalone Version] perldemo\multivmeter.pl
#!/usr/bin/perl
use perlchartdir;

# The values to display on the meter
my $value0 = 30.99;
my $value1 = 45.35;
my $value2 = 77.64;

# Create an LinearMeter object of size 60 x 245 pixels, using silver background with
# a 2 pixel black 3D depressed border.
my $m = new LinearMeter(60, 245, perlchartdir::silverColor(), 0, -2);

# Set the scale region top-left corner at (25, 30), with size of 20 x 200 pixels. The
# scale labels are located on the left (default - implies vertical meter)
$m->setMeter(25, 30, 20, 200);

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

# Set 0 - 50 as green (99ff99) zone, 50 - 80 as yellow (ffff66) zone, and 80 - 100 as
# red (ffcccc) zone
$m->addZone(0, 50, 0x99ff99);
$m->addZone(50, 80, 0xffff66);
$m->addZone(80, 100, 0xffcccc);

# Add deep red (000080), deep green (008000) and deep blue (800000) pointers to
# reflect the values
$m->addPointer($value0, 0x000080);
$m->addPointer($value1, 0x008000);
$m->addPointer($value2, 0x800000);

# Add a text box label at top-center (30, 5) using Arial Bold/8 pts/deep blue
# (000088), with a light blue (9999ff) background
$m->addText(30, 5, "Temp C", "arialbd.ttf", 8, 0x000088, $perlchartdir::TopCenter
    )->setBackground(0x9999ff);

# Output the chart
$m->makeChart("multivmeter.png")

[CGI Version] perldemo_cgi\multivmeter.pl
#!/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;

# The values to display on the meter
my $value0 = 30.99;
my $value1 = 45.35;
my $value2 = 77.64;

# Create an LinearMeter object of size 60 x 245 pixels, using silver background with
# a 2 pixel black 3D depressed border.
my $m = new LinearMeter(60, 245, perlchartdir::silverColor(), 0, -2);

# Set the scale region top-left corner at (25, 30), with size of 20 x 200 pixels. The
# scale labels are located on the left (default - implies vertical meter)
$m->setMeter(25, 30, 20, 200);

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

# Set 0 - 50 as green (99ff99) zone, 50 - 80 as yellow (ffff66) zone, and 80 - 100 as
# red (ffcccc) zone
$m->addZone(0, 50, 0x99ff99);
$m->addZone(50, 80, 0xffff66);
$m->addZone(80, 100, 0xffcccc);

# Add deep red (000080), deep green (008000) and deep blue (800000) pointers to
# reflect the values
$m->addPointer($value0, 0x000080);
$m->addPointer($value1, 0x008000);
$m->addPointer($value2, 0x800000);

# Add a text box label at top-center (30, 5) using Arial Bold/8 pts/deep blue
# (000088), with a light blue (9999ff) background
$m->addText(30, 5, "Temp C", "arialbd.ttf", 8, 0x000088, $perlchartdir::TopCenter
    )->setBackground(0x9999ff);

# Output the chart
binmode(STDOUT);
print "Content-type: image/png\n\n";
print $m->makeChart2($perlchartdir::PNG);