Perl Requires Chilkat v11.7.0+

QR Code with a Text Caption

See more QR Code Examples

Demonstrates printing a line of text under a QR code, such as the order number or the address the code holds, so that a person can read it too. render.text turns the caption on and gives its value, which is printable ASCII and is drawn in a built-in font that needs no font files. The caption can go above or below the symbol, be aligned left, center or right, and be scaled. Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

my $json = Chilkat2::JsonObject->new;
$json->UpdateString('payload.text', 'https://www.chilkatsoft.com/order/12345');
$json->UpdateInt('render.moduleSize', 6);

# The caption.  It need not be the same as the text in the QR code.
$json->UpdateBool('render.text.enabled', 1);
$json->UpdateString('render.text.value', 'ORDER 12345');
# position is "below" (the default) or "above".  alignment is "center" (the default), "left" or "right".
$json->UpdateString('render.text.position', 'below');
# Each dot of the caption's font is drawn this many pixels wide.
$json->UpdateInt('render.text.scale', 3);

$json->UpdateString('output.path', 'qa_output/qr_caption.png');
$json->UpdateBool('output.overwrite', 1);
$json->UpdateString('output.return', 'none');

my $fmt = Chilkat2::Formats->new;
my $jsonOut = Chilkat2::JsonObject->new;
my $success = $fmt->QrCode('generate', $json, $jsonOut);
if (!$success) {
    print $fmt->LastErrorText, "\n";
    exit;
}

print 'caption: ', $jsonOut->StringOf('measurements[0].text'), "\n";
print 'caption scale: ', $jsonOut->IntOf('measurements[0].textScale'), "\n";
print 'height added for the caption: ', $jsonOut->IntOf('measurements[0].textBandPx'), " pixels\n";
print 'image: ', $jsonOut->IntOf('measurements[0].canvasWidth'), ' x ', $jsonOut->IntOf('measurements[0].canvasHeight'), " pixels\n";

# The image written to qa_output/qr_caption.png:

# 

# Sample output:

# caption: ORDER 12345
# caption scale: 3
# height added for the caption: 21 pixels
# image: 222 x 243 pixels