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## Flash
Flash Hack A Custom Color Transform Class Contributed by O'Reilly Media Article Rating: / 6 2004-10-12 Poor Best
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Flash Hack A Custom Color Transform Class Code Listing: A Custom Transform Class A Closer Look at the Code Constructor Function Transform() Enhancing the Custom Class Search For More Articles! Author Terms |
|  | Flash Hack A Custom Color Transform Class - Code Listing: A Custom Transform Class ( Page 2 of 5 ) Although we can’t give a full course on OOP and ActionScript 2.0 here, this custom color transform class can be used even if you don’t understand OOP. And we’ll examine several aspects of the code after the code listing. Here is our object-oriented version, implemented as a custom Transform class, which must be stored in an external Transform.as file: // This ActionScript 2.0 code must go in an external Transform.as file class Transform { // NEG_TRANS inverts the color values. // NEUTRAL_TRANS resets the color values. // BLACK_TRANS sets the color values to black. // WHITE_TRANS sets the color values to white. // RATE sets the rate the effects will run at in ms. private static var NEG_TRANS:Object = {ra:-100, rb:255, ga:-100, gb:255, ba:-100, bb:255, aa:100, ab:0}; private static var NEUTRAL_TRANS:Object = {ra:100, rb:0, ga:100, gb:0, ba:100, bb:0, aa:100, ab:0}; private static var BLACK_TRANS:Object = {ra:100, rb:-255, ga:100, gb:-255, ba:100, bb:-255, aa:100, ab:0}; private static var WHITE_TRANS:Object = {ra:100, rb:255, ga:100, gb:255, ba:100, bb:255, aa:100, ab:0}; private static var RATE:Number = 50; private var interval:Number; private var startTime:Number; private var colorObj:Color; // Constructor accepts target clip to which to apply transforms public function Transform(targetClip:MovieClip) { colorObj = new Color(targetClip); } // Inverts the color values public function invert(duration:Number):Void { applyTransform(NEG_TRANS, duration); } // Resets the color to the default values set in the authoring tool public function reset(duration:Number):Void { applyTransform(NEUTRAL_TRANS, duration); } // Performs a fade to black over specified duration in ms public function fadeToBlack(duration:Number):Void { applyTransform(BLACK_TRANS, duration); } // Performs a fade to white over specified duration in ms public function fadeToWhite(duration:Number):Void { applyTransform(WHITE_TRANS, duration); } // Function to initiate a fade and set up an interval to // complete it over time. private function applyTransform(transObject:Object, duration:Number):Void { var getTrans:Object = colorObj.getTransform( ); var diffTrans:Object = new Object( ); startTime = getTimer( ); for (var i in transObject) { diffTrans[i] = (transObject[i] - getTrans[i]) / (duration / RATE); } // Use the form of setInterval( ) that invokes a method of an object, // so that instance properties are in scope (the object is this). // First parameter is the object (this) on which to invoke the // method specified by the second parameter (in this case // "transition", which must be passed as a string). // Third parameter is interval duration in ms. // Fourth, fifth, and sixth parameters get passed to transition( ) interval = setInterval(this, "transition", RATE, transObject, diffTrans, duration); } // This method applies each step of the color transformation. private function transition(transObject:Object, diffTrans:Object, duration:Number):Void { var getTrans:Object = colorObj.getTransform( ); for (var i in diffTrans) { getTrans[i] += diffTrans[i]; } colorObj.setTransform(getTrans); if (getTimer( ) - startTime > duration) { // Complete the final step in the transition colorObj.setTransform(transObject); // Clear the interval to stop the effect clearInterval(interval); } // Force the screen to refresh between frames updateAfterEvent( ); } public function die( ):Void { // Perform any cleanup code here } }
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## Flash Articles
- Basic Flash ActionScript for Designers - Working with external data in Flash - Working with Text and HTML in Flash - Introduction to Flex - What is ActionScript? - The Power of LoadVars Object - Making an MP3/FLV Player with Flash MX 2004 ... - Using Function: The Beginner's Nightmare - Flash Hack A Custom Color Transform Class - Create a Flash Speech Synthesizer - Undocumented ActionScript Flash Hack - Object-oriented ActionScript - Flash Hacks: Simulate 3D and Add a Vector Ed... - ActionScript 2.0 Overview - A Simple XML-Based Searchable Database
## More by O'Reilly Media
- Introducing JavaServer Faces - Java in Review - Generics of Java 1.5 Tiger - What`s New in Java 1.5 Tiger? - XML as a Publishing Technology - Flash Hack A Custom Color Transform Class - Create a Flash Speech Synthesizer - Undocumented ActionScript Flash Hack - Object-oriented ActionScript - Flash Hacks: Simulate 3D and Add a Vector Ed... - ActionScript 2.0 Overview
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