Waveform类，波形的类，用一条线条来绘制的，加入了逐渐消失的轨迹的效果。
/*
类功能：波形。
*/
package net.cdipan.spectrum{
import flash.display.*;
import flash.filters.*;
import flash.geom.*;
public class Waveform extends Sprite {
//线条颜色
private const line_color:uint = 0x07f7ff;
//创建用来绘制线条的精灵对象
private var Line:Sprite;
//用于逐渐消失的轨迹的位图对象
private var bmpData:BitmapData;
private var bmp:Bitmap;
//滤镜的各项参数
private var colorM:ColorMatrixFilter;
private var blur:BlurFilter;
private var r:Rectangle;
private var point;
//通过数字使滤镜处理慢一步
private var num:int;
public function Waveform():void {
Line = new Sprite();
bmpData = new BitmapData(256,100,true,0);
bmp = new Bitmap(bmpData);
colorM = new ColorMatrixFilter([.98,0,0,0,0,0,.98,0,0,0,0,0,.98,0,0,0,0,0,.5,0]);
blur = new BlurFilter(7,7,BitmapFilterQuality.LOW);
r = new Rectangle(0,0,256,100);
p = new Point(0,0);
//添加显示对象
this.blendMode=BlendMode.ADD;
this.addChild(bmp);
this.addChild(Line);
}
//接收频谱数据
public function getSpectrum(array:Array):void {
if (num%2 == 0) {
var m:Number = 0;
for (var j=0; j<256; j+=2) {
m += array[j];
}
if (m != 0) {
//停止播放时不绘制图像，就只会显示一条直线
bmpData.draw(this);
}
bmpData.applyFilter(bmpData,r,p,colorM);
bmpData.applyFilter(bmpData,r,p,blur);
}
num++;
Line.graphics.clear();
Line.graphics.lineStyle(1,line_color,100);
for (var i=0; i<256; i+=2) {
var n:Number = array*50;
if (i != 0) {
Line.graphics.lineTo(i,50-n);
} else {
Line.graphics.moveTo(0,50-n);
}
}
}
}
}
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TAG: FLASH 制作