以下是 html5类似百度贴吧涂鸦绘图效果特效代码 的示例演示效果:
部分效果截图:
HTML代码(index.html):
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>html5类似百度贴吧涂鸦绘图效果</title>
<style type="text/css">
html,body,canvas,div,ul,li,h5,p{ margin:0; padding:0;-moz-user-select:none; -webkit-user-select:none; }
img{ border:1px #ccc solid;}
ul,li{ list-style:none;}
.wrap{ width:740px; margin:20px auto 5px; border:1px #ccc solid; overflow:hidden;}
.fl{ float:left; display:inline;}
#canvas{ border-right:1px #ccc solid; cursor:crosshair;}
#control{ width:130px; height:400px; margin-left:4px;}
#control div{ padding:5px;}
#canvas-color ul{ overflow:hidden;}
#canvas-color ul li{ float:left; display:inherit; width:13px; height:13px; border:3px #fff solid; margin:8px; cursor:pointer;}
#canvas-color ul li.js-border-color{ border-color:#000;}
#canvas-brush span{ display:inline-block; width:10px; height:10px; margin-left:10px; background:url(images/brush.png); cursor:pointer;}
#canvas-brush span.small-brush{ background-position:-6px -6px;}
#canvas-brush span.middle-brush{ background-position:-31px -6px;}
#canvas-brush span.big-brush{ background-position:-56px -6px;}
#canvas-brush span.js-bg-color{ background-color:#aaa;}
#canvas-control span{ display:inline-block; width:20px; height:15px; margin-left:10px; background:url(images/sketchpad_icons.png); cursor:pointer;}
#canvas-control span.return-control{ background-position:-2px -148px;}
#canvas-control span.next-control{ background-position:right -168px;}
#canvas-control span.empty-control{ background-position:-2px -188px;}
#canvas-control span.js-return-control{ background-position:-2px -209px;}
#canvas-control span.js-next-control{ background-position:right -230px;}
#canvas-control span.js-empty-control{ background-position:-2px -251px;}
#imgDiv{ text-align:center;}
</style>
</head>
<body>
<div class="wrap">
<canvas id="canvas" class="fl" width="600" height="400"></canvas>
<div id="control" class="fl">
<div id="canvas-color">
<h5>画笔颜色</h5>
<ul>
<li style="background:#fef4ac"></li>
<li style="background:#0018ba"></li>
<li style="background:#ffc200"></li>
<li style="background:#f32f15"></li>
<li style="background:#cccccc"></li>
<li style="background:#5ab639"></li>
</ul>
</div>
<div id="canvas-brush">
<h5>画笔大小</h5>
<span class="small-brush"></span>
<span class="middle-brush"></span>
<span class="big-brush"></span>
</div>
<div id="canvas-control">
<h5>操作</h5>
<span title="上一步" class="return-control"></span>
<span title="下一步" class="next-control"></span>
<span title="清除" class="empty-control"></span>
</div>
<div id="canvas-drawImage">
<h5>生成图像</h5>
<p><button class="drawImage">生成图像</button></p>
</div>
</div>
</div>
<div id="imgDiv"></div>
<script type="text/javascript">
var doc=document,
canvas=doc.getElementById('canvas'),
colorDiv=doc.getElementById('canvas-color'),
brushDiv=doc.getElementById('canvas-brush'),
controlDiv=doc.getElementById('canvas-control'),
drawImageDiv=doc.getElementById('canvas-drawImage'),
imgDiv=doc.getElementById('imgDiv');
function Canvas(){
this.init.apply(this,arguments);
}
Canvas.prototype={
//存储当前表面状态数组-上一步
preDrawAry:[],
//存储当前表面状态数组-下一步
nextDrawAry:[],
//中间数组
middleAry:[],
//配置参数
confing:{
lineWidth:1,
lineColor:"blue",
shadowBlur:2
},
init:function(oCanvas,oColor,oBrush,oControl,oDrawImage,imgDiv){
this.canvas=oCanvas;
this.context=oCanvas.getContext('2d');
this.colorDiv=oColor;
this.brushDiv=oBrush;
this.controlDiv=oControl;
this.drawImageDiv=oDrawImage;
this.imgDiv=imgDiv;
this._initDraw();
this._draw(oCanvas);
this.setColor();
this.setBrush();
this.preClick();
this.nextClick();
this.clearClick();
this.drawImage(oCanvas);
},
_initDraw:function(){
var preData=this.context.getImageData(0,0,600,400);
//空绘图表面进栈
this.middleAry.push(preData);
},
//涂鸦主程序
_draw:function(oCanvas,context){
var _this=this;
oCanvas.onmousedown=function(e){
var x=e.clientX,
y=e.clientY,
left=this.parentNode.offsetLeft,
top=this.parentNode.offsetTop,
canvasX=x-left,
canvasY=y-top;
_this._setCanvasStyle();
//清除子路径
_this.context.beginPath();
_this.context.moveTo(canvasX,canvasY);
//当前绘图表面状态
var preData=_this.context.getImageData(0,0,600,400);
//当前绘图表面进栈
_this.preDrawAry.push(preData);
document.onmousemove=function(e){
var x2=e.clientX,
y2=e.clientY,
t=e.target,
canvasX2=x2-left,
canvasY2=y2-top;
if(t==oCanvas){
_this.context.lineTo(canvasX2,canvasY2);
_this.context.stroke();
}else{
_this.context.beginPath();
}
}
document.onmouseup=function(e){
var t=e.target;
if(t==oCanvas){
//当前绘图表面状态
var preData=_this.context.getImageData(0,0,600,400);
if(_this.nextDrawAry.length==0){
//当前绘图表面进栈
_this.middleAry.push(preData);
}else{
_this.middleAry=[];
_this.middleAry=_this.middleAry.concat(_this.preDrawAry);
_this.middleAry.push(preData);
_this.nextDrawAry=[];
$('.js-next-control').addClass('next-control');
$('.next-control').removeClass('js-next-control');
}
_this._isDraw();
}
this.onmousemove=null;
}
}
},
//设置画笔
_setCanvasStyle:function(){
this.context.lineWidth=this.confing.lineWidth;
this.context.shadowBlur=this.confing.shadowBlur;
this.context.shadowColor=this.confing.lineColor;
this.context.strokeStyle=this.confing.lineColor;
},
//设置颜色
setColor:function(){
this.colorDiv.onclick=this.bind(this,this._setColor);
},
_setColor:function(e){
var t=e.target;
if(t.nodeName.toLowerCase()=="li"){
this.confing.lineColor=t.style.backgroundColor;
$('.js-border-color').removeClass('js-border-color');
$(t).addClass('js-border-color');
}
},
//设置画笔大小
setBrush:function(){
this.brushDiv.onclick=this.bind(this,this._setBrush);
},
_setBrush:function(e){
var t=e.target;
if(t.nodeName.toLowerCase()=="span"){
if(t.className.indexOf("small-brush")>=0){
this.confing.lineWidth=3;
}else if(t.className.indexOf("middle-brush")>=0){
this.confing.lineWidth=6;
}else if(t.className.indexOf("big-brush")>=0){
this.confing.lineWidth=12;
}
$('.js-bg-color').removeClass('js-bg-color');
$(t).addClass('js-bg-color');
}
},
//判断是否已涂鸦,修改按钮状态
_isDraw:function(){
if(this.preDrawAry.length){
$('.return-control').addClass('js-return-control');
$('.return-control').removeClass('return-control');
$('.empty-control').addClass('js-empty-control');
$('.empty-control').removeClass('empty-control');
}else{
return false;
}
},
//点击上一步-改变涂鸦当前状态
preClick:function(){
var pre=this.controlDiv.getElementsByTagName("span")[0];
pre.onclick=this.bind(this,this._preClick);
},
_preClick:function(){
if(this.preDrawAry.length>0){
var popData=this.preDrawAry.pop();
var midData=this.middleAry[this.preDrawAry.length+1];
this.nextDrawAry.push(midData);
this.context.putImageData(popData,0,0);
}
if(this.nextDrawAry.length){
$('.next-control').addClass('js-next-control');
$('.next-control').removeClass('next-control');
}
if(this.preDrawAry.length==0){
$('.js-return-control').addClass('return-control');
$('.return-control').removeClass('js-return-control');
}
},
//点击下一步-改变涂鸦当前状态
nextClick:function(){
var next=this.controlDiv.getElementsByTagName("span")[1];
next.onclick=this.bind(this,this._nextClick);
},
_nextClick:function(){
if(this.nextDrawAry.length){
var popData=this.nextDrawAry.pop();
var midData=this.middleAry[this.middleAry.length-this.nextDrawAry.length-2];
this.preDrawAry.push(midData);
this.context.putImageData(popData,0,0);
}
if(this.preDrawAry.length){
$('.return-control').addClass('js-return-control');
$('.return-control').removeClass('return-control');
}
if(this.nextDrawAry.length==0){
$('.js-next-control').addClass('next-control');
$('.next-control').removeClass('js-next-control');
}
},
//清空
clearClick:function(){
var clear=this.controlDiv.getElementsByTagName("span")[2];
clear.onclick=this.bind(this,this._clearClick);
},
_clearClick:function(){
var data=this.middleAry[0];
this.context.clearRect(0,0,this.context.canvas.width,this.context.canvas.height);
this.preDrawAry=[];
this.nextDrawAry=[];
this.middleAry=[this.middleAry[0]];
this.controlDiv.getElementsByTagName("span")[0].className="return-control";
this.controlDiv.getElementsByTagName("span")[1].className="next-control";
this.controlDiv.getElementsByTagName("span")[2].className="empty-control";
},
//生成图像
drawImage:function(){
var btn=this.drawImageDiv.getElementsByTagName("button")[0];
btn.onclick=this.bind(this,this._drawImage);
},
_drawImage:function(){
var url=this.canvas.toDataURL('image/png'),
img=new Image();
img.src=url;
this.imgDiv.innerHTML="";
this.imgDiv.appendChild(img);
},
bind:function(obj,handler){
return function(){
return handler.apply(obj,arguments);
}
}
}
new Canvas(canvas,colorDiv,brushDiv,controlDiv,drawImageDiv,imgDiv);
</script>
</body>
</html>
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