AS3 Spectrum analyser - just one last question plz

programming flash
1

Hello everyone,

I’m coming to this forum as a last chance to accomplish a spectrum analyser script i’ve modified so far.
I’ve got one and only problem with it, i can’t get the bars backgrounds to be transparent (in fact I want to use this eq over an image in a project and dont want the bars to leave a color on the image used)
I’ve uploaded a file for you to use and help if you will, just put a song renammed ‘son.mp3’ in the folder to test.
You will see that the white bars leave black traces Id’like to remove.

A big thank you to you people who will help.
have a nice day !

Btw, here is the code :

package classes {
import flash.display.;
import flash.events.;
import flash.geom.Matrix;
import flash.net.URLRequest;
import flash.media.Sound;
import flash.media.SoundChannel;
import flash.media.SoundTransform;
import flash.utils.ByteArray;
import flash.media.SoundMixer;
import flash.geom.Rectangle;
import flash.geom.Point;
import flash.geom.ColorTransform;
import flash.geom.Matrix;
import flash.errors.EOFError;
import flash.utils.Timer;

public class MainCoreX extends MovieClip {

public var outputBitmap:BitmapData
public var myBytes:ByteArray;
public var myColorTransform:ColorTransform;
public var screenSprite:Sprite;
public var myPoint:Point;
public var myRectangle:Rectangle;
public var nWidth:Number;
public var globalIntro:intro = new intro();

public function MainCoreX() {
    init();
}

public function init():void {

initStage();
startIntro();
MainTest();
}

private function initStage():void {
    stage.frameRate = 30;
    stage.showDefaultContextMenu = false;
    stage.scaleMode = StageScaleMode.NO_SCALE;
    stage.align = StageAlign.TOP_LEFT;
}

public function startIntro():void {
addChild(globalIntro);
}

public function MainTest()
{
var mySound:Sound = new Sound();
mySound.load ( new URLRequest (“son.mp3”) );
mySound.play();
BasicSpectrum ( 20,20,200 );
}

public function BasicSpectrum ( pWidth:Number, pHeight:Number, pAmplitude:Number )
{
nWidth = pWidth;
outputBitmap = new BitmapData ( pWidth, pHeight, true, 0x00FFFFF);
myRectangle = new Rectangle (0, 0, 2, 0);
myPoint = new Point (0, 0);
screenSprite = new Sprite();
screenSprite.addChild ( new Bitmap ( outputBitmap ) );
globalIntro.spectre_box.addChild ( screenSprite );
myColorTransform = new ColorTransform (0xffffff, 0xffffff, 0xffffff);
myBytes = new ByteArray();
addEventListener (Event.ENTER_FRAME, drawEqualizer);
}

public function drawEqualizer (pEvt:Event):void
{
// computeSpectrum() to get a byteArray
SoundMixer.computeSpectrum ( myBytes, true );
var i:Number = 64;
outputBitmap.colorTransform ( outputBitmap.rect, myColorTransform );

try {
while ( --i > -1 ) {
// move the pointer so that it jump some bytes
myBytes.position = i * 16;
// get amplitude value
var offset:int = myBytes.readFloat()*-25;
// move the strike position
myRectangle.x = (4 * i);
if ( offset >= 0 ) {
myRectangle.y = 20-offset;
myRectangle.height = offset;
// draw a strike with fillRect()
outputBitmap.floodFill ( 0, 0, 0x00FFFFFF );
} else {
myRectangle.y = 0;
myRectangle.height = -offset;
outputBitmap.fillRect ( myRectangle, 0xFFFFFFFF )
};
}
} catch (err:EOFError) {
trace(“you’ve gone too far”)
}
}
}
}