RobbleWobbleLoop Actionscript

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RCSfile: RobbleWobbleLoop.as,v  Revision: 1.2  Date: 2003/02/05 02:30:16  

Copyright 2003 Orgdot AS. All Rights Reserved. http://dev.swfit.com
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
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RobbleWobbleLoop.as is a little loop that will wobble a rotation around a specific angle. This angle can easily be set by a script action in f.i a button. The main thing to notice is that we always set a positive angle, and that we always will choose the shortest distance between two angles. So - the shortest distance from 2 degrees to 358 degrees is -4 degrees - to -2 degrees.
The angle should be stored in _level0 - and the name should be the name of the roto-clip + "_angle";
author      Olaf Havnes
version     Revision: 1.2  Date: 2003/02/05 02:30:16  
since       SWFIT1.0


We read our destination angle from _level0:

to_angle = eval ("/:" add _name add "_angle");

Place the destination angle value inside the first 360 degrees.

while (to_angle < 0) to_angle += 360;
while (to_angle >= 360) to_angle -= 360;

Place the stored angle value inside the first 360 degrees.

while (from_angle < 0) from_angle += 360;
while (from_angle >= 360) from_angle -= 360;

Find the SHORTEST distance from the stored value to the destination value.

dist_angle = to_angle - from_angle;
if (dist_angle > 180) dist_angle -= 360;
if (dist_angle < -180) dist_angle += 360;

Compute the speed based on distance we have to travel.

speed_angle += ac * dist_angle - fr * speed_angle;

Set the new angle.

from_angle += speed_angle;
_rotation = from_angle;

We need to set the scale to 100%, since flash for some reason nudges the scale

slightly for each rotate command.


_xscale = 100;
_yscale = 100;