Snow animation

I found a Script for snowflakes in my Edge-Animation film:

http://www.heathrowe.com/edge/snowflakes/snowflakes.zip

My Question:

How can I get the snowflakes before all other objects?

At present, they are only in the background, behind other objects.

Thanks for your help :-)

Here is the Code I use:



//canvas init


$('<canvas id="canvas"></canvas>').appendTo("#Stage");


var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");


//canvas dimensions
var W = window.innerWidth;
var H = window.innerHeight;
canvas.width = W;
canvas.height = H;


//snowflake particles
var mp = 95; //max particles
var particles = [];
for(var i = 0; i < mp; i++)
{
  particles.push({
  x: Math.random()*W, //x-coordinate
  y: Math.random()*H, //y-coordinate
  r: Math.random()*4+1, //radius
  d: Math.random()*mp //density
  })
}


//Lets draw the flakes
function draw()
{
  ctx.clearRect(0, 0, W, H);


  ctx.fillStyle = "rgba(255, 255, 255, 0.8)";
  ctx.beginPath();
  for(var i = 0; i < mp; i++)
  {
  var p = particles[i];
  ctx.moveTo(p.x, p.y);
  ctx.arc(p.x, p.y, p.r, 0, Math.PI*2, true);
  }
  ctx.fill();
  update();
}


//Function to move the snowflakes
//angle will be an ongoing incremental flag. Sin and Cos functions will be applied to it to create vertical and horizontal movements of the flakes
var angle = 0;
function update()
{
  angle += 0.01;
  for(var i = 0; i < mp; i++)
  {
  var p = particles[i];
  //Updating X and Y coordinates
  //We will add 1 to the cos function to prevent negative values which will lead flakes to move upwards
  //Every particle has its own density which can be used to make the downward movement different for each flake
  //Lets make it more random by adding in the radius
  p.y += Math.cos(angle+p.d) + 1 + p.r/2;
  p.x += Math.sin(angle) * 2;


  //Sending flakes back from the top when it exits
  //Lets make it a bit more organic and let flakes enter from the left and right also.
  if(p.x > W+5 || p.x < -5 || p.y > H)
  {
  if(i%3 > 0) //66.67% of the flakes
  {
  particles[i] = {x: Math.random()*W, y: -10, r: p.r, d: p.d};
  }
  else
  {
  //If the flake is exitting from the right
  if(Math.sin(angle) > 0)
  {
  //Enter from the left
  particles[i] = {x: -5, y: Math.random()*H, r: p.r, d: p.d};
  }
  else
  {
  //Enter from the right
  particles[i] = {x: W+5, y: Math.random()*H, r: p.r, d: p.d};
  }
  }
  }
  }
}


//animation loop
setInterval(draw, 33);

Old code:

$('__').appendTo ("#Stage");

var canvas = document.getElementById ("canvas");

CTX var = canvas.getContext ("2d");

dimensions of the canvas

var W = window.innerWidth;

var H = window.innerHeight;

New code:

SYM. $('') .appendTo (sym.$("Rectangle"));

var canvas = document.getElementById ("canvas");

CTX var = canvas.getContext ("2d");

var W = sym.$("Rectangle").innerWidth ();

var H = sym.$("Rectangle").innerHeight ();

Demo file: neige.zip - Box

Tags: Edge Animate

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