Musings » JavaScript

HTML5 Canvas To PPM Serializer

fpmurphy — Sat, 24 Apr 2010 21:41:09 +0000

This post demonstrates how to save the contents of a HTML5 canvas object to a Portable Pixel Map (PPM) encoded image file. It also discusses various gamma transfer functions including sRGB, radiance and luminance.

JavaScript Shell Command Line Processing

fpmurphy — Wed, 24 Feb 2010 17:37:14 +0000

This post demonstrates how to provide robust support for command line argument processing in a JavaScript shell using the classical Unix getopts paradigm. It also demonstrates how to access environmental variables from a JavaScript shell.

HTML5 Canvas Element Rubber Banding

fpmurphy — Tue, 23 Feb 2010 20:42:43 +0000

This post demonstrates one method of implementing rubber banding on a HTML5 canvas element using JavaScript. It also demonstrates how to horizontally flip, emboss, invert, and gray (grey) sections of an image.

Microsoft SUA JavaScript Shell

fpmurphy — Wed, 07 Oct 2009 03:34:07 +0000

This post shows you how to build and smoketest a JavaScript shell for Microsoft Windows Vista SUA using the SpiderMonkey 1.8 sources

JavaScript File Object

fpmurphy — Wed, 07 Jan 2009 19:53:00 +0000

As you are probably aware JavaScript engines such as SpiderMonkey typically do not allow access to the local filesystem for reasons of security. To enable developers to test the scripts from a command line, js includes the load() function which enables you to load one or more JavaScript scripts into the SpiderMonkey engine. However this [...]

JavaScript Shells

fpmurphy — Fri, 02 Jan 2009 22:26:00 +0000

Recently I was working on a fairly complex JavaScript script relating to floating point conversions for a new Web page. After a while I got tired on trying to debug the problem via a Web browser and decided to see if I could find a JavaScript shell, i.e. a standalone Javascript intrepreter just like Ruby’s irb, [...]