First time here? First time here? Newsletter Signup Newsletter
Search tutorials
Author: Mr10 | Website: http://www.mr10.net

The light source

The light source is symbolized by xm and ym. These coordintates either represent the coordinates of the mouse, or are put on the path of a function. For this path I chose a deltoid. I found this function on this page written by Paul Bourke in 1990.
I made a button to switch between 'manual' and 'automatic', the if statements handles that. The variable i represents theta needed to make steps in the deltoid function.
The _root.light mc is a white circle representing the light source.

// making the light move -----
if (i >= 360) { i=i - 360 }
// must be in radians (not degrees)
theta=(_root.convrad) * i;
// -------------------------------

// path of lightsource -----------
if (_root.lightsource == "manual") {

	xm = _root._xmouse;
	ym = _root._ymouse;

} else if (_root.lightsource == "automatic"){

// you can replace this function for any other you like better 

	xm = xb + (2 * a * Math.cos(theta) + a * Math.cos(2 * theta));
	ym = yb + (2 * a * Math.sin(theta) - a * Math.sin(2 * theta));
// -------------------------------
» Level Advanced

Added: 2001-11-06
Rating: 8 Votes: 204
(10 being the highest)
» Author
Mr10 stands for Maarten van de Voorde, Graphic Design student from Holland. Being in his forth year he hopes to be employed by January, but for now he has some sparetime to do some free-lance assignments while graduating.
» Download
Download the files used in this tutorial.
» Forums
More help? Search our boards for quick answers!


  • There are no comments yet. Be the first to comment!

  • You must have javascript enabled in order to post comments.

Leave a Comment
  • Your email address will not be published. All fields are required.
Featured Flash FLA
» Author: Inocreato
» Title: RaiseTheBlocks
» Description: Raise all the blocks to win the game
Featured Sound Loops
Image for equalize

Audio Player

» Author: TomCat Carty
» Title: The Wood
» Description: Just a little game ending or it can maybe be looped. Recorders with music box and percussion to give the feel of well, I don't know, the woods? Free to use, just credit me. thank you
Latest Font
» Author: Fábio FAFERS
» Description: I created this font for free use. Everyone can apply it in personal or business texts. Its free, but I want to be communicated in case of business use. Donations are accepted to keep the project of free fonts alive! Thank you all
Featured Sound Fx
Image for equalize

Audio Player

» Author: Davisigner
» Description: Hmm... what to say about this one? It's reminiscent of the closing notes of the opening music from the Three Stooges done in a church organ style with a closing cymbal crash. I'll give this one away gratis, but feel free to check out my free loops and potential upcoming license-mandated ones over in the respective part of Flashkit.