JavaScript

Javascript code to convert light wavelength to color

Submitted by ams on Sun, 04/15/2012 - 20:09

In the electromagnetic spectrum illustration and light color, frequency and wavelength post, I needed to calculate color from wavelength value. I tried a few different approaches but finally settled on a modified version of some widely cited FORTRAN code for determining RGB values.

Draw an oval in html5 canvas

Submitted by ams on Thu, 03/08/2012 - 15:53

The JavaScript canvas element does not have a native method for drawing ovals (ellipses).

Drawing regular polygons in javascript canvas

Submitted by ams on Tue, 01/17/2012 - 10:01
Geometric shapes such as regular polygons are useful building blocks for drawing more complex elements within JavaScript canvas tags. The following block shows 3, 4, 5, 6, 7, 8, 9 and 10 sided regular polygons.
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