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. Perl

use chilkat();

$success = 0;

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

$json = chilkat::CkJsonObject->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");

$fmt = chilkat::CkFormats->new();
$jsonOut = chilkat::CkJsonObject->new();
$success = $fmt->QrCode("generate",$json,$jsonOut);
if ($success == 0) {
    print $fmt->lastErrorText() . "\r\n";
    exit;
}

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