Background tutorial Flash - Skin Investigation

Background tutorial Flash

Create a Whimsical Animated Flash Background

Twice a month, we revisit some of our readers’ favorite posts from throughout the history of Activetuts+. This tutorial was first published in May, 2009.

Using ActionScript 3.0, we'll create a cool Animated Background that we can use in Menu Screens or as a Music Visualizer.

Final Result Preview

Let's take a look at what we'll be working towards:

Step 1: Brief Overview

We'll create a Class that will take care of the whole effect. When you call the class, you'll be able to change the number of lights, color, alpha, size, direction, speed and the quality of the Blur filter. In this way it's possible to achieve many different results when using it. Also, you can use any background you want.

Step 2: The .fla Document

Create a new ActionScript 3.0 document (File > New...). Set the Stage size to your desired dimensions, I've used 600 x 300 px.

Step 3: Your Background

Add or draw an image to use as the background, I've used a simple blue gradient (#02C7FB, #1F63B4).

Step 4: Layers

Rename the first layer to "Background" then create another one and name it "Code". You can lock the "Code" layer to avoid placement of unwanted drawings in there.

Step 5: ActionScript

Save your work and let's get into the code!

I'm assuming you already have a basic understanding of ActionScript 3.0, if you have any keyword specific doubts please refer to the Flash Help (F1).

Create a new ActionScript file (File > New...).

Step 6: Importing Required Classes

package Classes { /* Import required classes */ import flash.display.MovieClip; import flash.filters.BitmapFilter; import flash.filters.BlurFilter; import;

Here we import the Classes that we'll use, remember that the word next to "package" is the name of the folder where our Class is located.

Step 7: Extending the Class

//We need to extend the class so we can use the addChild method. public class Lights extends MovieClip {

Extending the MovieClip class will allow our class to inherit all of the methods, properties and functions that the MovieClip has, in this case we use it to get access to the addChild method.

Step 8: The Variables

Although they have pretty much self explanatory names I'll add short comments on each var to make sure it's clear. They get their values from the parameters of the Main function.

private var lightsNumber:int; //The number of Lights on Stage private var xSpeed:int; //The horizontal speed the Lights have private var ySpeed:int; //Vertical Speed private var lightsDir:String; //Direction the Lights are going, this can be Up, Down, Left or Right private var areaW:int; //The width of the area where the effect will take place private var areaH:int; //Height private var lights:Array = new Array; //This array will store all the Lights MovieClips so we can use them outside the For where we are going to create them.

Step 9: Main Function

/* Main function */ public function init(areaWidth:int, areaHeight:int, numberOfLights:int, lightSize:int, lightColor:uint, minimumScale:Number, hSpeed:int, vSpeed:int, dir:String, quality:int):void { areaW = areaWidth; areaH = areaHeight; lightsNumber = numberOfLights; lightsDir = dir;

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