今天是个好日子，2014年5月20日，表白的最佳时机，虽说孩子已经四岁、结婚已经五年，但是也不可以偷懒，于是有了这个效果。

在线研究点这里，下载收藏点这里。程序猿and程序媛，大胆秀出你的爱吧。

利用html5 canvas实现动态的文字粒子效果，效果如下。

OK，简单看看原理，首先我们需要在canvas里面实现描边文字，然后利用getImageData获得描边文字的像素矩阵，将粒子效果绑定在描边文章上。

整个效果如下。

html文件非常简单。

<canvas id="canvas" width="1000" height="600"></canvas>

body {
	background: #000;
	text-align: center;
	font-family: "simhei"
}
canvas {
	margin: auto;
	position: absolute;
	left: 0;
	right:0;
	top: 0;
	bottom: 0;
}

		 
BLUR = false;
 
PULSATION = true;
PULSATION_PERIOD = 1000;
PARTICLE_RADIUS = 1;
 
/* disable blur before using blink */
 
BLINK = false;
 
GLOBAL_PULSATION = false;
 
QUALITY = 2; /* 0 - 5 */
 
/* set false if you prefer rectangles */
ARC = true;
   
/* trembling + blur = fun */
TREMBLING = 0; /* 0 - infinity */
 
FANCY_FONT = "Arial";
 
BACKGROUND = "#000";
 
BLENDING = true;
 
/* if empty the text will be a random number */
var TEXT;
num = 0;
TEXTArray = ["Whq", "Love", "Xcl", "Ever"];

QUALITY_TO_FONT_SIZE = [10, 12, 30, 50, 200, 350];
QUALITY_TO_SCALE = [20, 6, 4, 1, 0.9, 0.5];
QUALITY_TO_TEXT_POS = [10, 20, 40, 60, 170, 280];


window.onload = function () {
    document.body.style.backgroundColor = BACKGROUND;
 
    var canvas = document.getElementById("canvas");
    var ctx = canvas.getContext("2d");
 
    var W = canvas.width;
    var H = canvas.height;
 
    var tcanvas = document.createElement("canvas");
    var tctx = tcanvas.getContext("2d");
    tcanvas.width = W;
    tcanvas.height = H;
 
    total_area = W * H;
    total_particles = 1000;
    single_particle_area = total_area / total_particles;
    area_length = Math.sqrt(single_particle_area);
    		 
    var particles = [];
    for (var i = 1; i <= total_particles; i++) {
        particles.push(new particle(i));
    }
    
    function particle(i) {
        this.r = Math.round(Math.random() * 255 | 0);
        this.g = Math.round(Math.random() * 255 | 0);
        this.b = Math.round(Math.random() * 255 | 0);
        this.alpha = 1;
 
        this.x = (i * area_length) % W;
        this.y = (i * area_length) / W * area_length;
 
        /* randomize delta to make particles sparkling */
        this.deltaOffset = Math.random() * PULSATION_PERIOD | 0;
 
        this.radius = 0.1 + Math.random() * 2;
    }
 	
 	var positions = [];
	
	function new_positions() {
 
        TEXT = TEXTArray[num];
 
        if (num < TEXTArray.length - 1) {
            num++;
        } else {
            num = 0;
        }
        //alert(TEXT);
 
        tctx.fillStyle = "white";
        tctx.fillRect(0, 0, W, H)
        tctx.fill();
 
        tctx.font = "bold " + QUALITY_TO_FONT_SIZE[QUALITY] + "px " + FANCY_FONT;
        
 
        tctx.strokeStyle = "black";
        tctx.fillStyle="#f00";
        tctx.strokeText(TEXT,30, 50);
        //tctx.fillText(TEXT,30, 50);
 
        image_data = http://www.mamicode.com/tctx.getImageData(0, 0, W, H);>
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