مدیاویکی:Common.js: تفاوت بین نسخه‌ها

/* Any JavaScript here will be loaded for all users on every page load. */
// shim layer with setTimeout fallback




window.requestAnimFrame = (function(){
  return  window.requestAnimationFrame       ||
          window.webkitRequestAnimationFrame ||
          window.mozRequestAnimationFrame    ||
          function( callback ){
            window.setTimeout(callback, 1000 / 23);
          };
})();


$(function(){
  $(window).resize(function(){
    $("#playArea").attr({
      'width': $('body').width(),
      'height': $('body').height()
    });
    
    width = $('body').width();
    height = $('body').height();
    
  });
  $(window).resize();
});

var Point = function(){
  this._size = 0.5;
  this._x = 0;
  this._y = 0;
  this._direction = 0;
  this._velocity = 0;
  this._distances = [];
  this._neighboors = [];
  this._randomization = 0;

  this.__collection = null;
  
  
  this._step = function(aCollection){

    var modifiedVelocity = this._velocity*1 * ((Math.random() * this._randomization+1)/10);
    var direction = (Math.random()*2%2 >1)?-1:1;

    this._direction =  this._direction*1 + ((Math.random() * this._randomization) * direction);
    var radianAngle = this._direction * Math.PI / 180;

    
    this._x = (this._x * 1) + (modifiedVelocity * Math.cos(radianAngle) * 1);
    this._y = (this._y * 1) + (modifiedVelocity * Math.sin(radianAngle) * 1);

    if(this._x > width) this._x = 0;
    if(this._x < 0) this._x = width;
    if(this._y > height) this._y = 0;
    if(this._y < 0) this._y = height;
 
    this.__collection = aCollection;
    

  }
  
  this._computeNeighboors = function() {
    if(this.__collection == null)  return;

    aCollection = this.__collection;
    //compute the closest neighboor
    this._distances = [];
    for(i=0; i < aCollection.length; i++){
      
      if(aCollection[i]._x != this._x &&
         aCollection[i]._y != this._y){


        this._distances.push({
          pointIndex: i,
          pointObj: aCollection[i],
          distance: Math.sqrt( 
            Math.pow((this._x - aCollection[i]._x), 2) + 
            Math.pow((this._y - aCollection[i]._y), 2)
          )
        });
      }
    }
    this._distances.sort(function(a,b){ 
      defaultReturn = 0;
      if(a.distance < b.distance) defaultReturn = -1;
      if(a.distance > b.distance) defaultReturn = 1;
      return defaultReturn

    });
    
    this._neighboors = this._distances.slice(0,3);
  }

  
  this.draw = function(context){
    this._computeNeighboors();
    
    //draw connection lines
    
    context.lineWidth = 0.25;
    context.strokeStyle = '#666';
    
    context.beginPath();    
    for(i=0; i<this._neighboors.length; i++) {

        context.moveTo(this._x, this._y);
        context.lineTo(this._neighboors[i].pointObj._x,   this._neighboors[i].pointObj._y);
      
        context.lineWidth = 0.10 + 5 / this._neighboors[i].distance;
    }
    context.closePath();

    context.stroke();
    
    context.beginPath();
    context.arc(this._x, this._y, this._size*this._velocity, 0, 2 * Math.PI, false);
    context.fillStyle = '#999';
    context.strokeStyle = '#666';
    context.lineWidth = 0.5;
    context.fill();
    context.stroke();
    
    context.beginPath();
    context.arc(this._x, this._y, this._size, 0, 2 * Math.PI, false);
    context.fillStyle = '#666';
    context.fill();
    
//    ctx.fillText(this._direction.toFixed(2), this._x, this._y);
    
  }
}


var aPoints = [];
var can, ctx, interval, width, height;
var numPoints = 50;
/* var distanceTreshold = 100; */

function init() {
  can = document.getElementById("playArea");
  ctx = can.getContext("2d");
  width = $('body').width();
  height = $('body').height();
  
  for(x=0; x<numPoints; x++){
    var newPoint = new Point();
    newPoint._size = (Math.random() * (3 - 0.5) + 0.5).toFixed(2);
    newPoint._x = (Math.random() * width).toFixed(0);
    newPoint._y = (Math.random() * height).toFixed(0);
    newPoint._direction = (Math.random() * 360).toFixed(2);
    newPoint._velocity = (Math.random() * (4 - 0.1) + 0.2).toFixed(2);
    newPoint._randomization = (Math.random() * (10 - 0) + 0).toFixed(2);
    aPoints.push(newPoint);
  }

  animate();
}

function animate(){
  for(x=0; x<numPoints; x++){
    aPoints[x]._step(aPoints);
  }
  requestAnimFrame( animate );
  draw();
}

function draw(){
  ctx.save();

  ctx.clearRect(0,0,width,height);
  
  for(x=0; x<numPoints; x++){
    aPoints[x].draw(ctx);
  }
  
  ctx.restore();
}

init();