How to create realistic fire effect in html5 canvas using javascript

how to make fire effect in html5 canvas using javascript - Nibunan

how to create fire in html5 canvas using javascript - Nibunan

how to write program to display fire effect in html5 canvas using javascript - Nibunan

how to write program to create animation in html5 canvas using javascript - Nibunan

how to write code to create fire effect in html5 canvas in javascript - Nibunan

Html5 canvas is evolving to give the rich graphics on browser without using flash or other plugins. Html5 canvas is being used in many places like games animations and rich user interfaces on web and so on.This airticle explains how to create realistic fire effect in html5 canvas using javascript.

Demo

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Source


      <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
      <html xmlns="http://www.w3.org/1999/xhtml">
      <head>
      <title>Creating fire effect using html5 canvas - Nibunan</title>
      </head>
      <body style="margin: 0px">
      <canvas width="700" height="450" id="drawing-surface"></canvas>
      <script type="text/javascript">
      function Random(range) {
      return Math.floor((Math.random() * range) + 1);
      }
      function RandomFloat(range) {
      return (Math.random() * range) + 1;
      }
      var viewport = new Viewport();
      for (var i = 0; i < 200; i++) {
      var particle = new Particle();
      viewport.addObject(particle);
      }
      viewport.init();
      </script>
      </body>
      </html>
    

Viewport


      function Viewport() {
      var me = this;
      me.objects = [];
      var canvas = document.getElementById("drawing-surface");
      function resizeCanvas() {
      canvas.width = window.innerWidth;
      canvas.height = window.innerHeight;
      }
      resizeCanvas();
      window.onresize = function () {
      resizeCanvas();
      }
      var drawingSurface = document.getElementById("drawing-surface").getContext("2d");
      me.doPaint = true;
      function drawBackgroundImage() {
      drawingSurface.globalAlpha = 1;
      drawingSurface.fillStyle = 'black';
      drawingSurface.fillRect(0, 0, canvas.width, canvas.height);
      }
      function drawObjects() {
      for (var i = 0; i < me.objects.length; i++) {
      me.objects[i].paint(drawingSurface);
      }
      }
      me.paintInit = function () {
      me.doPaint = true;
      }
      function paint() {
      me.paintInit();
      if (me.doPaint) {
      drawBackgroundImage();
      drawObjects();
      me.doPaint = false;
      }
      }
      var timer;
      me.init = function () {
      timer = setInterval(function () { paint(); }, 1000 / 30);
      };
      me.repaint = function () {
      me.doPaint = true;
      };
      me.addObject = function (obj) {
      me.objects.push(obj);
      }
      }
    

Fire Particle


      function Particle() {
      var me = this;
      var source = {};
      source.location = { x: window.innerWidth / 2, y: (window.innerHeight / 2) + 100 };
      me.reset = function () {
      me.wind = 0;
      me.speed = RandomFloat(5) - 10;
      me.radius = 20;
      me.opacity = 255;
      me.greenFactor = 255;
      me.color = 'rgb(255,255,0)';
      me.location = { x: source.location.x + Random(40), y: source.location.y };
      };
      me.reset();
      me.move = function () {
      if (me.location.y < source.location.y - 300 || me.radius <= 1) {
      me.reset();
      }
      me.radius += 20 / (300 / me.speed);
      me.opacity += 255 / (300 / me.speed);
      me.greenFactor += 255 / ((300*2) / me.speed);
      me.color = "rgb(255," + (Math.floor(me.greenFactor)+1) + ",0)";
      me.location.x += me.wind;
      me.location.y += me.speed;
      };
      me.paint = function (context) {
      me.move();
      context.beginPath();
      context.arc(me.location.x, me.location.y, me.radius, 0, 2 * Math.PI, false);
      context.fillStyle = me.color;
      context.globalAlpha = me.opacity / 255;
      context.fill();
      context.closePath();
      };
      }