Draw 1-D barcodes to Canvases
npm install bardcodeRender 1-D barcodes to canvas, svg, or path. Supports Code 128, 3 of 9, 2 of 5, EAN, and more.
This barcode library specializes in its use of the canvas API. You provide a canvas (be it in a browser or with node-canvas), and then specify where the barcode should be drawn, how large it should be, and at what angle.
Other barcode libraries that I found created pngs or svgs directly and were not very flexible in the output size (i.e. no maxWidth option). Rendering directly to a canvas allows for a flexible API if that's your target anyway. You can also easily generate SVG or Path text output.
Did you ever want to paste a list of strings and download a zip file of corresponding images? Well I did once and made this barcode-generator. See demos for the source.
js
// In the browser
var canvas = document.getElementById("barcode-canvas");
var g = canvas.getContext("2d");
drawBarcode(g, "Test barcode", options);
`js
// On the server
var bardcode = require("bardcode");
var Canvas = require("canvas");
var canvas = new Canvas(595, 842, "pdf");
var g = canvas.getContext("2d");
bardcode.drawBarcode(g, "Test barcode", options);
`js
// Meteor server
var Canvas = Meteor.npmRequire("canvas");
var canvas = new Canvas(595, 842, "pdf");
var g = canvas.getContext("2d");
drawBarcode(g, "Test barcode", options);
`Symbology
The following barcode formats are supported:* Codabar
* Code 128 (and GS1 128)
* Code 39
* EAN-8
* EAN-13
* FIM
* ITF (interleaved 2 of 5)
* UPC-A
API
js
// browser+meteor
drawBarcode(g, barcodeText, options);// node
var bardcode = require("bardcode");
bardcode.drawBarcode(g, barcodeText, options);
`*
is a Canvas' 2-D graphics context or the output format. The only supported non-canvas output format is "svg".
* barcodeText is a string or an array (in case you want to include command characters like "FNC 1"). Allowed characters depend on the chosen symbology. You generally don't need to include start, end, or check characters.
* options is an optional object with the following properties:
* options.type Barcode type. Defaults to Code 128. Other valid options are "GS1 128", "Codabar", "Code 39", "EAN-8", "EAN-13", "FIM", "ITF" (interleaved 2 of 5), and "UPC-A".
* options.hasChecksum If true, the barcode already has a checksum (which will be validated); if false, calculate and add a checksum. Defaults to false. Currently works only for EAN-type barcodes (EAN-8, EAN-13, UPC-A).
* options.x Where to draw barcode. Defaults to 0.
* options.y Where to draw the barcode. Defaults to 0.
* options.horizontalAlign How to align the barcode. Defaults to "left". Other options are "center" and "right".
* options.verticalAlign How to align the barcode. Defaults to "top". Other options are "middle" and "bottom".
* options.height Barcode height. Defaults to 90.72.
* options.moduleWidth Width of thinnest bar. Defaults to 2.892.
* options.quietZoneSize Number of moduleWidths in quiet zone on either side. Defaults to 10.
* options.angle Rotate barcode this many degrees clockwise. Defaults to 0.
* options.maxWidth Maximum barcode width (including quiet zones). If specified, then the moduleWidth will be adjusted if necessary to make the entire barcode fit in the given width.
* options.width If given, then ignore moduleWidth and maxWidth and set the moduleWidth so that the barcode will have the given width (including quiet zones).Note:
width and maxWidth refer to the unrotated barcode width.SVG
If the first parameter to bardcode.drawBarcode, g, is "svg", then an SVG string is returned.For the moment, the only supported options when using SVG are:
*
options.type
*
*
*
*
* Path
If the first parameter to , g, is "path", then a path string is returned, like:`path
M 28.920,0 l 5.784,0 l 0,90.72 l -5.784,0 Z M 37.596,0 l 2.892,0 l 0,90.72 l -2.892,0 Z M 46.272,0 l 2.892,0 l 0,90.72 l -2.892,0 Z M 60.732,0 l 2.892,0 l 0,90.72 l -2.892,0 Z M 69.408,0 l 11.568,0 l 0,90.72 l -11.568,0 Z M 83.868,0 l 2.892,0 l 0,90.72 l -2.892,0 Z M 92.544,0 l 2.892,0 l 0,90.72 l -2.892,0 Z M 98.328,0 l 5.784,0 l 0,90.72 l -5.784,0 Z M 109.896,0 l 2.892,0 l 0,90.72 l -2.892,0 Z M 124.356,0 l 2.892,0 l 0,90.72 l -2.892,0 Z M 130.140,0 l 11.568,0 l 0,90.72 l -11.568,0 Z M 147.492,0 l 2.892,0 l 0,90.72 l -2.892,0 Z M 156.168,0 l 2.892,0 l 0,90.72 l -2.892,0 Z M 164.844,0 l 11.568,0 l 0,90.72 l -11.568,0 Z M 179.304,0 l 2.892,0 l 0,90.72 l -2.892,0 Z M 187.980,0 l 11.568,0 l 0,90.72 l -11.568,0 Z M 205.332,0 l 2.892,0 l 0,90.72 l -2.892,0 Z M 211.116,0 l 2.892,0 l 0,90.72 l -2.892,0 Z M 219.792,0 l 5.784,0 l 0,90.72 l -5.784,0 Z M 234.252,0 l 8.676,0 l 0,90.72 l -8.676,0 Z M 245.820,0 l 2.892,0 l 0,90.72 l -2.892,0 Z M 251.604,0 l 5.784,0 l 0,90.72 l -5.784,0 Z
`For the moment, the only supported options when using path are:
*
*
*
*
*
* Errors
Errors are thrown on invalid input, for example when including letters in EAN barcodes.Installation
installation causes issues for a lot of users. So it's an optional dependency (i.e. you should Bring Your Own Canvas). It's also not a node dependency because it's not the only output format.For the browser:
* Include
dist/bardcode.js or dist/bardcode.min.jsFor node:
*
(requires cairo)
* npm install bardcodeFor meteor:
* (optional)
and add "canvas": "1.1.6" to packages.json
* Testing
Tests require meteor and zbar.* Download zbar: http://zbar.sourceforge.net/
*
*
Copy and zbar/.libs/libzbar.so to a new directory called zbar in bardcode's project directory
* meteor test-packages ./ in bardcode's project directory
* Open localhost:3000` in a browser* wolfgang42
* Tom S.
* I Putu Susila