html5+js+canvas燃烧的火焰文字特效

1、新建html文档。

2、书写hmtl代艨位雅剖码。<div> </div><div id="艘早祓胂canvasContainer"><div style="position: absolute; font-family: Arial; font-size: 10px; background-color: rgb(0, 0, 32); opacity: 0.9; width: 80px; padding-top: 2px;"> <div style="color: rgb(0, 255, 255); margin-left: 3px; margin-bottom: 3px;"><strong>37 FPS</strong> (0-43)</div> <canvas width="74" height="30" style="display: block; margin-left: 3px; margin-bottom: 3px;"></canvas></div><canvas width="1000" height="600" style="position: absolute; left: 340px; top: 146.5px;"></canvas></div>

3、书写css代码。<style>html, body { margin : 0px; width : 100%; height : 100%; overflow: hidden; background-color: #000000; font-family: sans-serif; }#canvasContainer { margin : 0px; width : 100%; height : 100%; }</style>

4、书写并添加js代码。<script>function Stats(){ this.init();}Stats.prototype = { init: fun艘早祓胂ction() { this.frames = 0; this.framesMin = 100; this.framesMax = 0; this.time = new Date().getTime(); this.timePrev = new Date().getTime(); this.container = document.createElement("div"); this.container.style.position = 'absolute'; this.container.style.fontFamily = 'Arial'; this.container.style.fontSize = '10px'; this.container.style.backgroundColor = '#000020'; this.container.style.opacity = '0.9'; this.container.style.width = '80px'; this.container.style.paddingTop = '2px'; this.framesText = document.createElement("div"); this.framesText.style.color = '#00ffff'; this.framesText.style.marginLeft = '3px'; this.framesText.style.marginBottom = '3px'; this.framesText.innerHTML = '<strong>FPS</strong>'; this.container.appendChild(this.framesText); this.canvas = document.createElement("canvas"); this.canvas.width = 74; this.canvas.height = 30; this.canvas.style.display = 'block'; this.canvas.style.marginLeft = '3px'; this.canvas.style.marginBottom = '3px'; this.container.appendChild(this.canvas); this.context = this.canvas.getContext("2d"); this.context.fillStyle = '#101030'; this.context.fillRect(0, 0, this.canvas.width, this.canvas.height ); this.contextImageData = this.context.getImageData(0, 0, this.canvas.width, this.canvas.height); setInterval( bargs( function( _this ) { _this.update(); return false; }, this ), 1000 ); }, getDisplayElement: function() { return this.container; }, tick: function() { this.frames++; }, update: function() { this.time = new Date().getTime(); this.fps = Math.round((this.frames * 1000 ) / (this.time - this.timePrev)); //.toPrecision(2); this.framesMin = Math.min(this.framesMin, this.fps); this.framesMax = Math.max(this.framesMax, this.fps); this.framesText.innerHTML = '<strong>' + this.fps + ' FPS</strong> (' + this.framesMin + '-' + this.framesMax + ')'; this.contextImageData = this.context.getImageData(1, 0, this.canvas.width - 1, 30); this.context.putImageData(this.contextImageData, 0, 0); this.context.fillStyle = '#101030'; this.context.fillRect(this.canvas.width - 1, 0, 1, 30); this.index = ( Math.floor(30 - Math.min(30, (this.fps / 60) * 30)) ); this.context.fillStyle = '#80ffff'; this.context.fillRect(this.canvas.width - 1, this.index, 1, 1); this.context.fillStyle = '#00ffff'; this.context.fillRect(this.canvas.width - 1, this.index + 1, 1, 30 - this.index); this.timePrev = this.time; this.frames = 0; }}function bargs( _fn ){ var args = []; for( var n = 1; n < arguments.length; n++ ) args.push( arguments[ n ] ); return function () { return _fn.apply( this, args ); };}(function (window){ var Sakri = window.Sakri || {}; window.Sakri = window.Sakri || Sakri; Sakri.MathUtil = {}; Sakri.MathUtil.normalize = function(value, minimum, maximum){ return (value - minimum) / (maximum - minimum); }; Sakri.MathUtil.interpolate = function(normValue, minimum, maximum){ return minimum + (maximum - minimum) * normValue; }; Sakri.MathUtil.map = function(value, min1, max1, min2, max2){ return Sakri.MathUtil.interpolate( Sakri.MathUtil.normalize(value, min1, max1), min2, max2); }; Sakri.MathUtil.hexToRgb = function(hex) { var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i; hex = hex.replace(shorthandRegex, function(m, r, g, b) { return r + r + g + g + b + b; }); var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex); return result ? { r: parseInt(result[1], 16), g: parseInt(result[2], 16), b: parseInt(result[3], 16) } : null; } Sakri.MathUtil.getRandomNumberInRange = function(min, max){ return min + Math.random() * (max - min); }; Sakri.MathUtil.getRandomIntegerInRange = function(min, max){ return Math.round(Sakri.MathUtil.getRandomNumberInRange(min, max)); };}(window));(function (window){ var Sakri = window.Sakri || {}; window.Sakri = window.Sakri || Sakri; Sakri.Geom = {}; Sakri.Geom.Point = function (x,y){ this.x = isNaN(x) ? 0 : x; this.y = isNaN(y) ? 0 : y; }; Sakri.Geom.Point.prototype.clone = function(){ return new Sakri.Geom.Point(this.x,this.y); }; Sakri.Geom.Point.prototype.update = function(x, y){ this.x = isNaN(x) ? this.x : x; this.y = isNaN(y) ? this.y : y; }; Sakri.Geom.Rectangle = function (x, y, width, height){ this.update(x, y, width, height); }; Sakri.Geom.Rectangle.prototype.update = function(x, y, width, height){ this.x = isNaN(x) ? 0 : x; this.y = isNaN(y) ? 0 : y; this.width = isNaN(width) ? 0 : width; this.height = isNaN(height) ? 0 : height; }; Sakri.Geom.Rectangle.prototype.getRight = function(){ return this.x + this.width; }; Sakri.Geom.Rectangle.prototype.getBottom = function(){ return this.y + this.height; }; Sakri.Geom.Rectangle.prototype.getCenter = function(){ return new Sakri.Geom.Point(this.getCenterX(), this.getCenterY()); }; Sakri.Geom.Rectangle.prototype.getCenterX = function(){ return this.x + this.width/2; }; Sakri.Geom.Rectangle.prototype.getCenterY=function(){ return this.y + this.height/2; }; Sakri.Geom.Rectangle.prototype.containsPoint = function(x, y){ return x >= this.x && y >= this.y && x <= this.getRight() && y <= this.getBottom(); }; Sakri.Geom.Rectangle.prototype.clone = function(){ return new Sakri.Geom.Rectangle(this.x, this.y, this.width, this.height); }; Sakri.Geom.Rectangle.prototype.toString = function(){ return "Rectangle{x:"+this.x+" , y:"+this.y+" , width:"+this.width+" , height:"+this.height+"}"; };}(window));(function (window){ var Sakri = window.Sakri || {}; window.Sakri = window.Sakri || Sakri; Sakri.CanvasTextUtil = {}; Sakri.CanvasTextUtil.getFontSizeForWidth = function(string, fontProps, width, canvas, fillStyle, maxFontSize){ if(!canvas){ var canvas = document.createElement("canvas"); } if(!fillStyle){ fillStyle = "#000000"; } if(isNaN(maxFontSize)){ maxFontSize = 500; } var context = canvas.getContext('2d'); context.font = fontProps.getFontString(); context.textBaseline = "top"; var copy = fontProps.clone(); context.font = copy.getFontString(); var textWidth = context.measureText(string).width; if(textWidth < width){ while(context.measureText(string).width < width){ copy.fontSize++; context.font = copy.getFontString(); if(copy.fontSize > maxFontSize){ console.log("getFontSizeForWidth() max fontsize reached"); return null; } } }else if(textWidth > width){ while(context.measureText(string).width > width){ copy.fontSize--; context.font = copy.getFontString(); if(copy.fontSize < 0){ console.log("getFontSizeForWidth() min fontsize reached"); return null; } } } return copy.fontSize; }; Sakri.CanvasTextProperties = function(fontWeight, fontStyle, fontSize, fontFace){ this.setFontWeight(fontWeight); this.setFontStyle(fontStyle); this.setFontSize(fontSize); this.fontFace = fontFace ? fontFace : "sans-serif"; }; Sakri.CanvasTextProperties.NORMAL = "normal"; Sakri.CanvasTextProperties.BOLD = "bold"; Sakri.CanvasTextProperties.BOLDER = "bolder"; Sakri.CanvasTextProperties.LIGHTER = "lighter"; Sakri.CanvasTextProperties.ITALIC = "italic"; Sakri.CanvasTextProperties.OBLIQUE = "oblique"; Sakri.CanvasTextProperties.prototype.setFontWeight = function(fontWeight){ switch (fontWeight){ case Sakri.CanvasTextProperties.NORMAL: case Sakri.CanvasTextProperties.BOLD: case Sakri.CanvasTextProperties.BOLDER: case Sakri.CanvasTextProperties.LIGHTER: this.fontWeight = fontWeight; break; default: this.fontWeight = Sakri.CanvasTextProperties.NORMAL; } }; Sakri.CanvasTextProperties.prototype.setFontStyle = function(fontStyle){ switch (fontStyle){ case Sakri.CanvasTextProperties.NORMAL: case Sakri.CanvasTextProperties.ITALIC: case Sakri.CanvasTextProperties.OBLIQUE: this.fontStyle = fontStyle; break; default: this.fontStyle = Sakri.CanvasTextProperties.NORMAL; } }; Sakri.CanvasTextProperties.prototype.setFontSize = function(fontSize){ if(fontSize && fontSize.indexOf && fontSize.indexOf("px")>-1){ var size = fontSize.split("px")[0]; fontProperites.fontSize = isNaN(size) ? 24 : size; return; } this.fontSize = isNaN(fontSize) ? 24 : fontSize; }; Sakri.CanvasTextProperties.prototype.clone = function(){ return new Sakri.CanvasTextProperties(this.fontWeight, this.fontStyle, this.fontSize, this.fontFace); }; Sakri.CanvasTextProperties.prototype.getFontString = function(){ return this.fontWeight + " " + this.fontStyle + " " + this.fontSize + "px " + this.fontFace; };}(window));window.requestAnimationFrame = window.__requestAnimationFrame || window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || (function () { return function (callback, element) { var lastTime = element.__lastTime; if (lastTime === undefined) { lastTime = 0; } var currTime = Date.now(); var timeToCall = Math.max(1, 33 - (currTime - lastTime)); window.setTimeout(callback, timeToCall); element.__lastTime = currTime + timeToCall; }; })();var readyStateCheckInterval = setInterval( function() { if (document.readyState === "complete") { clearInterval(readyStateCheckInterval); init(); }}, 10);var canvas;var context;var canvasContainer;var htmlBounds;var bounds;var minimumStageWidth = 250;var minimumStageHeight = 250;var maxStageWidth = 1000;var maxStageHeight = 600;var resizeTimeoutId = -1;var stats;function init(){ canvasContainer = document.getElementById("canvasContainer"); window.onresize = resizeHandler; stats = new Stats(); canvasContainer.appendChild( stats.getDisplayElement() ); commitResize();}function getWidth( element ){return Math.max(element.scrollWidth,element.offsetWidth,element.clientWidth );}function getHeight( element ){return Math.max(element.scrollHeight,element.offsetHeight,element.clientHeight );}function resizeHandler(){ context.clearRect(0,0,canvas.width, canvas.height); clearTimeout(resizeTimeoutId); clearTimeoutsAndIntervals(); resizeTimeoutId = setTimeout(commitResize, 300 );}function commitResize(){ if(canvas){ canvasContainer.removeChild(canvas); } canvas = document.createElement('canvas'); canvas.style.position = "absolute"; context = canvas.getContext("2d"); canvasContainer.appendChild(canvas); htmlBounds = new Sakri.Geom.Rectangle(0,0, getWidth(canvasContainer) , getHeight(canvasContainer)); if(htmlBounds.width >= maxStageWidth){ canvas.width = maxStageWidth; canvas.style.left = htmlBounds.getCenterX() - (maxStageWidth/2)+"px"; }else{ canvas.width = htmlBounds.width; canvas.style.left ="0px"; } if(htmlBounds.height > maxStageHeight){ canvas.height = maxStageHeight; canvas.style.top = htmlBounds.getCenterY() - (maxStageHeight/2)+"px"; }else{ canvas.height = htmlBounds.height; canvas.style.top ="0px"; } bounds = new Sakri.Geom.Rectangle(0,0, canvas.width, canvas.height); context.clearRect(0,0,canvas.width, canvas.height); if(bounds.width<minimumStageWidth || bounds.height<minimumStageHeight){ stageTooSmallHandler(); return; } startDemo();}function stageTooSmallHandler(){ var warning = "Sorry, bigger screen required :("; context.font = "bold normal 24px sans-serif"; context.fillText(warning, bounds.getCenterX() - context.measureText(warning).width/2, bounds.getCenterY()-12);}var animating = false;var particles = [];var numParticles = 10000;var currentText = "百度经验";var fontRect;var fontProperties = new Sakri.CanvasTextProperties(Sakri.CanvasTextProperties.BOLD, null, 100);var animator;var particleSource = new Sakri.Geom.Point();;var particleSourceStart = new Sakri.Geom.Point();var particleSourceTarget = new Sakri.Geom.Point();var redParticles = ["#fe7a51" , "#fdd039" , "#fd3141"];var greenParticles = ["#dbffa6" , "#fcf8fd" , "#99de5e"];var pinkParticles = ["#fef4f7" , "#f2a0c0" , "#fb3c78"];var yellowParticles = ["#fdfbd5" , "#fff124" , "#f4990e"];var blueParticles = ["#9ca2df" , "#222a6d" , "#333b8d"];var particleColorSets = [redParticles, greenParticles, pinkParticles, yellowParticles, blueParticles];var particleColorIndex = 0;var renderParticleFunction;var renderBounds;var particleCountOptions = [2000, 4000, 6000, 8000, 10000, 15000, 20000 ];var pixelParticleCountOptions = [10000, 40000, 60000, 80000, 100000, 150000 ];function clearTimeoutsAndIntervals(){ animating = false;}function startDemo(){ fontRect = new Sakri.Geom.Rectangle(Math.floor(bounds.x + bounds.width*.2), 0, Math.floor(bounds.width - bounds.width*.4), bounds.height); fontProperties.fontSize = 100; fontProperties.fontSize = Sakri.CanvasTextUtil.getFontSizeForWidth(currentText, fontProperties, fontRect.width, canvas); fontRect.y = Math.floor(bounds.getCenterY() - fontProperties.fontSize/2); fontRect.height = fontProperties.fontSize; renderBounds = fontRect.clone(); renderBounds.x -= Math.floor(canvas.width *.1); renderBounds.width += Math.floor(canvas.width *.2); renderBounds.y -= Math.floor(fontProperties.fontSize *.5); renderBounds.height += Math.floor(fontProperties.fontSize *.6); context.font = fontProperties.getFontString(); createParticles(); context.globalAlpha = globalAlpha; animating = true; loop();}function loop(){ if(!animating){ return; } stats.tick(); renderParticles(); window.requestAnimationFrame(loop, canvas);}function createParticles(){ context.clearRect(0,0,canvas.width, canvas.height); context.fillText(currentText, fontRect.x, fontRect.y); var imageData = context.getImageData(fontRect.x, fontRect.y, fontRect.width, fontRect.height); var data = imageData.data; var length = data.length; var rowWidth = fontRect.width*4; var i, y, x; particles = []; for(i=0; i<length; i+=4){ if(data[i+3]>0){ y = Math.floor(i / rowWidth); x = fontRect.x + (i - y * rowWidth) / 4; particles.push(x);//x particles.push(fontRect.y + y);//y particles.push(x);//xOrigin particles.push(fontRect.y + y);//yOrigin } } context.clearRect(0,0,canvas.width, canvas.height); xDirections = []; yDirections = []; for(i=0; i<directionCount; i++){ xDirections[i] = -7 + Math.random() * 14; yDirections[i] = Math.random()* - 5; }}var xDirections, yDirections;var globalAlpha = .11;var xWind = 0; var threshold = 60; var amountRed = 25; var amountGreen = 12; var amountBlue = 1; var directionCount = 100;function renderParticles(){ context.fillStyle = "#000000"; context.fillRect(renderBounds.x, renderBounds.y, renderBounds.width, renderBounds.height); context.fillStyle = "#f00"; context.fillText(currentText, fontRect.x, fontRect.y); var randomRed = amountRed -5 + Math.random()*10; var randomGreen = amountGreen -2 + Math.random()*4; var imageData = context.getImageData(renderBounds.x, renderBounds.y, renderBounds.width, renderBounds.height); var data = imageData.data; var rowWidth = imageData.width * 4; var index, i, length = particles.length; var d = Math.floor(Math.random()*30); xWind += (-.5 + Math.random()); xWind = Math.min(xWind, 1.5); xWind = Math.max(xWind, -1.5); for(i=0; i<length; i+=4, d++ ){ particles[i] += (xDirections[d % directionCount] + xWind); particles[i+1] += yDirections[d % directionCount]; index = Math.round(particles[i] - renderBounds.x) * 4 + Math.round(particles[i+1] - renderBounds.y) * rowWidth; data[index] += randomRed; data[index + 1] += randomGreen; data[index + 2] += amountBlue; if( data[index] < threshold){ particles[i] = particles[i+2]; particles[i+1] = particles[i+3]; } } context.putImageData(imageData, renderBounds.x, renderBounds.y);}var maxCharacters = 10;function changeText(){ var textInput = document.getElementById("textInput"); if(textInput.value && textInput.text!=""){ if(textInput.value.length > maxCharacters){ alert("Sorry, there is only room for "+maxCharacters+" characters. Try a shorter name."); return; } if(textInput.value.indexOf(" ")>-1){ alert("Sorry, no support for spaces right now :("); return; } currentText = textInput.value; clearTimeoutsAndIntervals(); animating = false; setTimeout(commitResize, 100); }}function changeSettings(){ clearTimeoutsAndIntervals(); animating = false; setTimeout(commitResize, 100);}function setParticleNumberOptions(values){ var selector = document.getElementById("particlesSelect"); if(selector.options.length>0 && parseInt(selector.options[0].value) == values[0] ){ return; } while(selector.options.length){ selector.remove(selector.options.length-1); } for(var i=0;i <values.length; i++){ selector.options[i] = new Option(values[i], values[i], i==0, i==0); }} </script>

5、代码整体结构。

6、查看效果。