如何用Div画条龙

本篇文章为大家展示了如何用Div画条龙，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

拆解需求

遇到不靠谱的产品经理和设计师，前端工程师真是惨。我们顶着最后交付成品的巨锅，所有deadline感觉都只是用来压榨前端工程师的。

诶，画个龙

用什么画，canvas

canvas能获得指定区域的像素点阵

卧槽，有招儿了

代码时间

先用图片搜索找一张龙的剪影

将图片绘制到canvas中

var canvas = document.getElementById("canvas"); var ctx = canvas.getContext("2d");  var image = new Image(); image.src = "dragon.jpg"; image.onload = function(){         canvas.width = image.width;         canvas.height = image.height;          ctx.drawImage(image,0,0); }

获取并裁剪画布的点阵信息

var imageData = ctx.getImageData(0,0,image.width,image.height).data; ctx.fillStyle = "#ffffff"; ctx.fillRect(0,0,image.width,image.height);  var gap = 6;  for (var h = 0; h < image.height; h+=gap) {     for(var w = 0; w < image.width; w+=gap){             var position = (image.width * h + w) * 4;             var r = imageData[position], g = imageData[position + 1], b = imageData[position + 2];              if(r+g+b==0){                     ctx.fillStyle = "#000";                     ctx.fillRect(w,h,4,4);                 }     } }

现在我们获得了这样一条龙的点阵信息

通过点阵信息生成气泡dom

var dragonContainer = document.getElementById("container"); var dragonScale = 2;  for (var h = 0; h < image.height; h+=gap) {     for(var w = 0; w < image.width; w+=gap){             var position = (image.width * h + w) * 4;             var r = imageData[position], g = imageData[position + 1], b = imageData[position + 2];              if(r+g+b==0){                     var bubble = document.createElement("img");                     bubble.src = "bubble.png";                     bubble.setAttribute("class","bubble");                      var bubbleSize = Math.random()*10+20;                     bubble.style.left = (w*dragonScale-bubbleSize/2) + "px";                     bubble.style.top = (h*dragonScale-bubbleSize/2) + "px";                     bubble.style.width = bubble.style.height = bubbleSize+"px";                     bubble.style.animationDuration = Math.random()*6+4 + "s";                      dragonContainer.appendChild(bubble);                 }     } }

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