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jQuery plugin to generate flame on a canvas element. Demo: http://codepen.io/wassname/pen/KVOKNe
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/** | |
* @name Flame | |
* @description jquery plugin to generate flame on a canvas element. | |
* Based on http://codepen.io/jackrugile/pen/Jbnpv | |
* @copyright (c) 2015 wassname | |
* @license: MIT | |
*/ | |
;(function ( $, window, document, undefined ) { | |
var pluginName = "flame"; | |
var defaults = { | |
hueRange: 50, | |
}; | |
var defaultState = { | |
parts: [], | |
partCount: 200, | |
partsFull: false, | |
on: true, | |
rendering: false, | |
globalTick: 0, | |
width: null, | |
height: null, | |
} | |
var Part = function(flame){ | |
this.flame=flame; | |
this.ctx=this.flame.ctx; | |
this.reset(); | |
}; | |
Part.prototype.reset = function(){ | |
this.startRadius = this.rand(1, 25); | |
this.radius = this.startRadius; | |
this.width = this.flame.state.width; | |
this.height = this.flame.state.height; | |
this.x = this.width/2 + (this.rand(0, 6) - 3); | |
this.y = 250; | |
this.vx = 0; | |
this.vy = 0; | |
this.hue = this.rand(this.flame.state.globalTick - this.flame.options.hueRange, this.flame.state.globalTick + this.flame.options.hueRange); | |
this.saturation = this.rand(50, 100); | |
this.lightness = this.rand(20, 70); | |
this.startAlpha = this.rand(1, 10) / 100; | |
this.alpha = this.startAlpha; | |
this.decayRate = 0.1; | |
this.startLife = 7; | |
this.life = this.startLife; | |
this.lineWidth = this.rand(1, 3); | |
} | |
Part.prototype.update = function(){ | |
this.vx += (this.rand(0, 200) - 100) / 1500; | |
this.vy -= this.life/50; | |
this.x += this.vx; | |
this.y += this.vy; | |
this.alpha = this.startAlpha * (this.life / this.startLife); | |
this.radius = this.startRadius * (this.life / this.startLife); | |
this.life -= this.decayRate; | |
if( | |
this.x > this.width + this.radius || | |
this.x < -this.radius || | |
this.y > this.height + this.radius || | |
this.y < -this.radius || | |
this.life <= this.decayRate | |
){ | |
this.reset(); | |
} | |
}; | |
Part.prototype.render = function(){ | |
this.ctx.beginPath(); | |
this.ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false); | |
this.ctx.fillStyle = this.ctx.strokeStyle = 'hsla('+this.hue+', '+this.saturation+'%, '+this.lightness+'%, '+this.alpha+')'; | |
this.ctx.lineWidth = this.lineWidth; | |
this.ctx.fill(); | |
this.ctx.stroke(); | |
}; | |
Part.prototype.rand = function(min, max){ | |
return Math.floor( (Math.random() * (max - min + 1) ) + min); | |
}; | |
var Flame = function(element, options){ | |
this.element = element; | |
this.options = $.extend( {}, defaults, options) ; | |
this._defaults = defaults; | |
this.init(); | |
}; | |
Flame.prototype.init = function (arguments) { | |
if(this.element.getContext) { | |
this.ctx = this.element.getContext("2d"); | |
} else { | |
return; | |
} | |
if (this.state) this.stop(); | |
this.state = $.extend( {parts: [],partsFull: false,globalTick: 0,}, defaultState, this.state); | |
// this.state = { | |
// parts: [], | |
// partCount: 200, | |
// partsFull: false, | |
// on: true, | |
// rendering: false, | |
// globalTick: 0, | |
// width: null, | |
// height: null, | |
// } | |
this.state.width = $(this.element).outerWidth(); | |
this.state.height = $(this.element).outerWidth(); | |
this.start(); | |
} | |
/** If needed: $(window).on('resize',this.onResize.bind(this) **/ | |
Flame.prototype.onResize = function (arguments) { | |
this.init(); | |
} | |
Flame.prototype.createParts = function(){ | |
if(this.state.parts.length > this.state.partCount){ | |
this.state.partsFull = true; | |
} else { | |
this.state.parts.push(new Part(this)); | |
} | |
}; | |
Flame.prototype.updateParts = function(){ | |
var i = this.state.parts.length; | |
while(i--){ | |
this.state.parts[i].update(); | |
} | |
}; | |
Flame.prototype.renderParts = function(){ | |
var i = this.state.parts.length; | |
while(i--){ | |
this.state.parts[i].render(); | |
} | |
}; | |
Flame.prototype.clear = function (arguments) { | |
this.ctx.globalAlpha = 1; | |
this.ctx.fillStyle = 'hsla(0, 0%, 0%, .0)'; | |
this.ctx.clearRect(0,0,this.state.width, this.state.height); | |
} | |
/** Fades the previous flames into opacity to product a blur **/ | |
Flame.prototype.fade = function(){ | |
this.ctx.globalCompositeOperation = 'destination-out'; | |
this.ctx.fillStyle = 'hsla(0, 0%, 0%, .3)'; | |
this.ctx.fillRect(0, 0, this.state.width, this.state.height); | |
this.ctx.globalCompositeOperation = 'lighter'; | |
}; | |
Flame.prototype.draw = function (arguments) { | |
this.fade(); | |
if (this.state.on){ | |
this.createParts(); | |
} else if (this.state.parts.length>1){ | |
this.state.parts.pop(); | |
} | |
this.updateParts(); | |
this.renderParts(); | |
} | |
Flame.prototype.start = function (arguments) { | |
if (!this.state.rendering){ | |
this.state.rendering=true | |
this.animate(); | |
return this | |
} else {return;} | |
} | |
Flame.prototype.stop = function (arguments) { | |
this.state.rendering=false; | |
this.clear(); | |
return this; | |
} | |
/** Toggle fuel and the flame will burn down or up again **/ | |
Flame.prototype.toggleFuel = function (state) { | |
if (state===undefined) | |
detector.flame.state.on=!detector.flame.state.on; | |
else | |
detector.flame.state.on=state; | |
return detector.flame.state.on; | |
} | |
Flame.prototype.animate = function(){ | |
window.requestAnimFrame(this.animate.bind(this),this.element); | |
this.state.globalTick++; | |
if (this.state.rendering) this.draw(); | |
}; | |
$.fn[pluginName] = function ( options ) { | |
return this.each(function () { | |
if (!$.data(this, 'plugin_' + pluginName)) { | |
$.data(this, 'plugin_' + pluginName, | |
new Flame( this, options )); | |
} | |
}); | |
} | |
// shim for requestAnimFrame | |
window.requestAnimFrame = (function(){ | |
return window.requestAnimationFrame || | |
window.webkitRequestAnimationFrame || | |
window.mozRequestAnimationFrame || | |
window.oRequestAnimationFrame || | |
window.msRequestAnimationFrame || | |
function(/* function */ callback, /* DOMElement */ element){ | |
window.setTimeout(callback, 1000 / 60); | |
}; | |
})(); | |
})( jQuery, window, document ); |
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