topical media & game development
graphic-flex-image-effects-11-Flex-CircularSoundWave.ax
graphic-flex-image-effects-11-Flex-CircularSoundWave.ax
[swf]
[flash]
flex
package {
import aether.utils.ImageUtil;
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Sprite;
import flash.events.Event;
import flash.filters.BitmapFilterQuality;
import flash.filters.BitmapFilterType;
import flash.filters.GradientGlowFilter;
import flash.geom.ColorTransform;
import flash.geom.Matrix;
import flash.utils.ByteArray;
[SWF(width=400, height=300, backgroundColor=0x000000)]
Draws the raw sound wave of a loaded sound playing in a circular pattern with
multiple filters applied. A copied, scaled up version of the same pattern is
placed behind to add more visual interest.
public class @ax-graphic-flex-image-effects-11-Flex-CircularSoundWave extends Sprite {
// the radius of the main circular pattern
private const WAVE_RADIUS:uint = 150;
// the colors used for the visualization
private const WAVE_COLORS:Array = [0x6666FF, 0xFFFFFF, 0x9966FF];
private var _soundController:graphic_flex_image_effects_11_Flex_SoundController;
private var _centerSprite:Sprite;
private var _backgroundData:BitmapData;
Constructor. Creates assets in which the visualization will be drawn and loads sound.
public function @ax-graphic-flex-image-effects-11-Flex-CircularSoundWave() {
makeBackground();
makeCenterSprite();
_soundController = new graphic_flex_image_effects_11_Flex_SoundController("graphic-flex-image-effects-11-assets-IrishRock.mp3");
_soundController.addEventListener(Event.CHANGE, onSoundChange);
}
Creates background bitmap data instance and places this on stage through a bitmap.
private function makeBackground():void {
_backgroundData = new BitmapData(stage.stageWidth, stage.stageHeight, false, 0xFF000000);
var background:Bitmap = new Bitmap(_backgroundData);
addChild(background);
}
Places a new sprite center stage in which the main visualization will be drawn.
A gradient glow filter is applied to the sprite.
private function makeCenterSprite():void {
_centerSprite = new Sprite();
_centerSprite.x = stage.stageWidth/2;
_centerSprite.y = stage.stageHeight/2;
addChild(_centerSprite);
_centerSprite.filters = [
new GradientGlowFilter(
5,
45,
WAVE_COLORS,
[0, 1],
[0, 180, 255],
10,
10,
1,
BitmapFilterQuality.MEDIUM,
BitmapFilterType.FULL,
true
)
];
}
Updates the background bitmap data with current visuals on the stage, scaled up and
set at a low opacity over the previous rendering.
private function updateBackground():void {
var capture:BitmapData = ImageUtil.getBitmapData(this);
// amount to scale up screen capture
var scale:Number = 1.3;
var matrix:Matrix = new Matrix();
matrix.scale(scale, scale);
// centers scaled up image
matrix.translate((width-width*scale)/2, (height-height*scale)/2);
// draws at low opacity so previous renderings are still visible
_backgroundData.draw(capture, matrix, new ColorTransform(.8, .6, .7, .3));
}
Updates the main visualization with new sound data.
private function updateCenterSprite():void {
// raw sound wave data is captured
var spectrumData:ByteArray = _soundController.getSoundSpectrum(false);
_centerSprite.graphics.clear();
_centerSprite.graphics.lineStyle(1, 0xFFFFFF);
var x:Number;
var y:Number;
var value:Number;
var angle:Number;
var i:int = -1;
while (++i < 512) {
// value is scaled to be within WAVE_RADIUS value
value = Math.ceil(WAVE_RADIUS*spectrumData.readFloat());
// each value will be drawn at different angle around full circle
angle = i/512*Math.PI*2;
x = Math.cos(angle)*value;
y = Math.sin(angle)*value;
_centerSprite.graphics.moveTo(0, 0);
_centerSprite.graphics.lineTo(x, y);
}
}
Handler for when the sound changes (basically, an ENTER_FRAME while the sound is playing).
This calls updateBackground() and updateCenterSprite() to redraw visualization.
parameter: event Event dispatched by SoundController.
private function onSoundChange(event:Event):void {
updateBackground();
updateCenterSprite();
}
}
}
(C) Æliens
04/09/2009
You may not copy or print any of this material without explicit permission of the author or the publisher.
In case of other copyright issues, contact the author.
