Complete example of brilliant circle effect based on canvas

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Complete example of brilliant circle effect based on canvas_javascript skills

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May 16, 2016 pm 03:17 PM

canvas

The example in this article describes the brilliant circle effect based on canvas. Share it with everyone for your reference, the details are as follows:

The screenshot of the running effect is as follows:

The specific code is as follows:

<!DOCTYPE html>
<html>
 <head>
  <title>demo</title>
  <style type="text/css">
   body {
    margin:0; background:black;
   }
   #canvas {
    border:3px solid gray; box-shadow:0px 0px 2px 2px #D5D5D5; margin-left:100px; margin-top:50px;
   }
   #power {
    position:fixed; bottom:50px; right:50px; 
   }
   #power a {
    color:green; text-decoration:none; display:inline-block; padding:20px; border:2px solid orange; box-shadow:0px 0px 2px 2px blue;
    font-size:30px;
   }
  </style>
 </head>
 <body>
  <canvas id="canvas" width="500px" height="500px"></canvas>
  <script type="text/javascript">
   var canvas = document.getElementById("canvas");
   var ctx = canvas.getContext("2d");
   var colorList = "abcdefABCDEF0123456789".split("");
   var colorListLength = colorList.length;
   var arcList = [];
   function createArc(attr) {
    ctx.beginPath();
    ctx.fillStyle = attr.color || "black";
    ctx.arc(attr.x, attr.y, attr.r, 0, Math.PI*2);
    ctx.closePath();
    ctx.fill();
   }
   function color() {
    var color = "#";
    for(var i=0; i<6; i++) {
     color += colorList[Math.round(Math.random()*colorListLength)];
    }
    return color;
   }
   function Arc() {
    this.count = 0;
    this.r = 5;
    this.x = Math.round(Math.random()*500);
    this.add = Math.round(Math.random()*5);
    this.limit = Math.round(Math.random()*100)
    this.mode = Math.round(Math.random());
    var _self = this;
    _self.run = function() {
     if(_self.r >= _self.limit) {
      _self.run = null;
      return;
     }
     _self.x += _self.add*(_self.mode == 1 &#63; 1 : -1);
     createArc({x: _self.x, y:Math.round(Math.random()*400), r: _self.r, color: color()});
     _self.r += 5;
     return _self;
    };
    return this;
   }
   var init_count = 150;
   var init_time = 0;
   var init = function() {
    init_time++;
    arcList.length = 0;
    for(var i=0; i<init_count; i++) {
     arcList.push(new Arc());
    }
   };
   var reInit = function() {
    var angle = Math.PI*2/init_count;
    for(var i=0; i<init_count; i++) {
     var _angle = i*angle;
     createArc({x: 250 + 250*Math.cos(_angle), y: 250 + 250*Math.sin(_angle), r: 5, color:color()});
     createArc({x: 250 + 200*Math.cos(_angle), y: 250 + 200*Math.sin(_angle), r: 5, color:color()});
     createArc({x: 250 + 150*Math.cos(_angle), y: 250 + 150*Math.sin(_angle), r: 5, color:color()});
     createArc({x: 250 + 100*Math.cos(_angle), y: 250 + 100*Math.sin(_angle), r: 5, color:color()});
    }
   };
   init();
   var globalInterval = setInterval(function() {
    ctx.clearRect(0, 0, 500, 500);
    var count = 0;
    for(var i=0; i<init_count; i++) {
     var arc = arcList[i];
     arc.run &#63; arc.run() : count++;
    }
    if(count == init_count) {
     if(init_time >= 2) {
      reInit();
      return;
     }
     init();
    }
   }, 100);
  </script>
 </body>
</html>

Readers who are interested in more content related to js special effects can check out the special topics of this site: "Summary of jQuery animation and special effects usage" and "Summary of common classic special effects of jQuery"

I hope this article will be helpful to everyone in JavaScript programming.

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