HPGLViewer

Javascript HPGL viewer using HTML5 Canvas.

Warning: This is an early release, only a handful of HPGL code is handled. If you would like to contribute, please do !

The code (as well as the doc) is really simple and straightforward for now, the idea is to see if there are people interested in a library to use in their own project, or just in an online viewer, or no one is interested because HPGL is sooo old.

Demo

https://drskullster.github.io/HPGLViewer/demo

Usage

Create a HTML Canvas element in your HTML page :

<canvas id="hpgl-viewer"></canvas>

Download HPGLViewer.js file in src/ folder then initialize with :

var hpglViewer = new HPGLViewer({
    container: "hpgl-viewer", // ID of the HTML Canvas element
    canvasWidth: 900, // in px
    machineTravelWidth: 416, // in mm
    machineTravelHeight: 259 // in mm
});

Feed HPGL content to viewer :

hpglViewer.draw("PU0,0;PD4000,4000;")

Development

Library is packaged into a UMD module with webpack.

You can run a development server that will watch changes and reload the demo page with npm run dev.

HPGL Commands

Done

• PU Pen Up (simply move on canvas)
• PD Pen Down
• PA Plot with absolute coordinates
• AA Arc
• SP Pen Select

Ignored

• IN Initialize
• VS speed select

Todo

• CP and other Text related commands
• CI Circles
• PR Position relative to next point ?
• IP and SC machine scale ?

Reference

See here for a list of HPGL commands :

• http://www.isoplotec.co.jp/HPGL/eHPGL.htm#-%20Plotter%20coordinate%20system
• http://paulbourke.net/dataformats/hpgl/