Interesting webpage background animation idea.

Newsgroups	alt.comp.lang.javascript
Date	2020-12-21 10:54 -0800
Message-ID	<7b40f349-4f59-42df-b52b-1d07717a8781n@googlegroups.com> (permalink)
Subject	Interesting webpage background animation idea.
From	Robam Khrictjan <he12457@hotmail.com>

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<html>
<body style="background-color:black;">
<canvas id="canvas" width="600" height="600"></canvas>

<script>
function precise(x) {
  return Number.parseFloat(x).toPrecision(2);
}
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");

var img = new Image();

img.src = "pict.jpeg"; 

var i=0;
var ii=precise(Math.random()*360);    
var count=0;
function draw() {
    if(count>10) {
       count=0;
       i=-360+2*precise(Math.random()*360);    
       ii-360+2*precise(Math.random()*360);      
    }
    count++;
    var move=0;
    if(i>360) i=0;
    if(ii>360) ii=0;
    if(i<-361) i=0;
    if(ii<-361) ii=0;
    
    if(ii-i<0) {
       i=i+1-Math.round(Math.random()*2);
       move=1;
    } else if(ii-i>0) {
       i=i+1-Math.round(Math.random()*2);
       move=1;
    } else {
       i=-360+2*precise(Math.random()*360);    
       ii-360+2*precise(Math.random()*360);      
    }
    if(move==1) {
      ctx.clearRect(0, 0, canvas.width*1.5, canvas.height*1.5);   
      ctx.save();
      ctx.translate(canvas.width/2,canvas.height/2);
      ctx.rotate(i*Math.PI/180);
      ctx.drawImage(img,-img.width/2,-img.width/2);
      ctx.restore();
    }
}

img.onload = function(){

   setInterval(function(){ draw(); }, 1);

}
</script>

</body>
</html>


Kristjan Robam

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Interesting webpage background animation idea. Robam Khrictjan <he12457@hotmail.com> - 2020-12-21 10:54 -0800

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