درس عمل ايقاعات صوتية

Code:
spacing = 1; // Spacing between bars.

margin = 3; // Shift all bars to right.

tot_bars = 21; // Total Spectrum Bars.

max_height = 20; // Maximum height of line in bars.

// ----------------------------------

// The spectrum definitions.

// ----------------------------------

// low = lowest the line(s) will go.

// high = highest the line(s) will go.

// n = number of lines affected.

// Make sure the sum of your n's = tot_bars.

// Example Rock Spectrum.

rock_spectrum = [

{low:5,high:20,n:2},

{low:12,high:20,n:8},

{low:3,high:15,n:3},

{low:7,high:15,n:3},

{low:5,high:10,n:3},

{low:0,high:5,n:2}

];

// Start the spectrum analyzer.

analyzer(rock_spectrum);

// ----------------------------

// Simulated Spectrum Analyzer

// ----------------------------

// spectrum : Array Spectrum Definition.

// isOn : Boolean - Turn on or off Analyzer

function analyzer(spectrum){

// Index of first bar range, first {low:#, high:#, n:#}

var curRange = 0;

// Number of lines the current range will affect.

var numLines = spectrum[curRange].n;

// Generate the vertical bar lines.

for(var i = 0; i < tot_bars; i++){

// Attach a one_bar movieclip.

var bar = this.attachMovie('one_bar','bar'+i,(i+1));

// Position the movieclip based on its width,

// spacing and margin specified in our variables.

bar._x = i * (bar._width + spacing) + margin;

// Set the bar's range to the current range.

bar.r = spectrum[curRange];

// Animate the bar vertically.

bar.onEnterFrame = function(){

// Choose a random number between the range we specified.

var h = Math.round(Math.random() * (this.r.high - this.r.low) + this.r.low);

// Using the random height, we generate more bars accordingly.

for(var i = 0; i < h; i++){

// Attach another bar.

var bar = this.attachMovie('one_bar','bar'+i,(i+1));

// Put it above the last bar.

bar._y -= i * (bar._height + spacing);

// Immediatly start fading the bar.

bar.onEnterFrame = function(){

this._alpha -= 20;

// If completely faded, remove the MovieClip.

if(this._alpha == 0) this.removeMovieClip();

}

}

}

// Countdown the number of lines we setup.

numLines--;

// If we reach 0, it is time to get the next range from our spectrum array.

if(numLines == 0) curRange++, numLines = spectrum[curRange].n;;

}

}

// --------------------------

// Turning off the Analyzer.

// --------------------------

function turnOff(){

// Loop through the number of vertical lines.

for(var i = 0; i < tot_bars; i++){

var bar = this['bar'+i];

// Stop the animation.

delete bar.onEnterFrame;

// Loop through the number of bars on the line, except first one.

for(var j = 1; j < max_height; j--){

// Remove the bars.

var b = bar['bar'+j].removeMovieClip();

}

}

}