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demo.html
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demo.html
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<!DOCTYPE html>
<head>
<meta charset="UTF-8">
<title>HTML5 Canvas API与文件拖放API实现拼图游戏</title>
<style>
header{
text-align:center;
width:800px;
}
div#divMain{
width:800px;
display: -moz-box;
display: -webkit-box;
-moz-box-orient:horizontal;
-webkit-box-orient:horizontal;
}
div#divLeft td{
border-width:1px;
width:80px;
height:80px;
background:#ccc;
}
div#divRight{
padding-left:10px;
width:400px;
display: -moz-box;
display: -webkit-box;
-moz-box-orient:vertical;
-webkit-box-orient:vertical;
}
div#divShowPic{
border:none;
width:400px;
height:400px;
}
td{
background:#ccc;
padding:0px;
margin:0px;
border:1px;
}
</style>
<script type="text/javascript">
var image,imageWidth,imageHeight,draggedCanvas;
document.ondragover = function(e){e.preventDefault();};
document.ondrop = function(e){e.preventDefault();};
function selectFile()
{
var td;
for(var i=0;i<5;i++)
{
for(var j=0;j<5;j++)
{
td=document.getElementById("leftTable").rows[i].cells[j];
td.innerHTML="";
}
}
var file = document.getElementById("file").files[0];
if(!/image\/\w+/.test(file.type))
{
alert(file.name+"不是图像文件！");
document.getElementById("divShowPic").innerHTML="请选择文件";
return;
}
else
{
document.getElementById("divShowPic").innerHTML="";
document.getElementById("divHiddenPic").innerHTML="";
canvas=document.createElement("canvas");
canvas.style.display="none";
document.getElementById("divHiddenPic").appendChild(canvas);
var ctx=canvas.getContext('2d');
image=new Image();
handleFileSelect(document.getElementById("file").files[0], image);
//image.src=document.getElementById("file").files[0].getAsDataURL();
image.onload=function()
{
ctx.drawImage(image,0,0);
imageWidth=image.width;
imageHeight=image.height;
}
document.getElementById("createPuzzle").disabled="";
}
}
function drawTable()
{
var canvas,ctx,canvasArray,index,count,div;
canvasArray=new Array();
div=document.getElementById("divShowPic");
table=document.createElement("table");
table.setAttribute("border","0");
table.setAttribute("cellpadding","0");
table.setAttribute("cellSpacing","1");
picWidth=400;
picHeight=400;
for(var i=0;i<5;i++)
{
for(var j=0;j<5;j++)
{
canvas=document.createElement("canvas");
ctx=canvas.getContext('2d');
canvas.setAttribute("width",picWidth/5+"px");
canvas.setAttribute("height",picHeight/5+"px");
canvas.setAttribute("draggable","true");
canvas.style.display="block";
canvas.setAttribute("index",i*5+j);
canvas.addEventListener("dragstart", function(ev)
{
draggedCanvas=ev.srcElement||ev.target;
var dt = ev.dataTransfer;
dt.effectAllowed = 'all';
dt.setData("text/plain",draggedCanvas.getAttribute("index"));
}, false);
ctx.fillRect(0,0,canvas.width,canvas.height);
ctx.drawImage(image,j*imageWidth/5,i*imageHeight/5,imageWidth/5,imageHeight/5,0,0,picWidth/5,picHeight/5);
canvasArray.push(canvas);
}
}
count=25;
for(var i=0;i<5;i++)
{
tr=document.createElement("tr");
for(var j=0;j<5;j++)
{
td=document.createElement("td");
td.setAttribute("tag","td");
td.addEventListener("dragend", function(ev)
{
ev.preventDefault();
}, false);
td.addEventListener("drop", function(ev)
{
var td=ev.srcElement||ev.target;
if(td.getAttribute("tag")!=null)
{
td.appendChild(draggedCanvas);
}
ev.preventDefault();
ev.stopPropagation();
}, false);
tr.appendChild(td);
index=parseInt(Math.random()*count);
td.appendChild(canvasArray[index]);
canvasArray.splice(index,1);
count-=1;
}
table.appendChild(tr);
}
div.appendChild(table);
document.getElementById("createPuzzle").disabled="disabled";
}
function window_onload()
{
var td;
for(var i=0;i<5;i++)
{
for(var j=0;j<5;j++)
{
td=document.getElementById("leftTable").rows[i].cells[j];
td.addEventListener("dragend", function(ev)
{
ev.preventDefault();
}, false);
td.addEventListener("drop", function(ev)
{
var td=ev.srcElement||ev.target;
if(td.getAttribute("tag")!=null)
{
td.appendChild(draggedCanvas);
}
var allHaveFlag=true;
var indexStr="";
for(var i=0;i<5;i++)
{
for(var j=0;j<5;j++)
{
canvas=document.getElementById("leftTable").rows[i].cells[j].children[0];
if(canvas==null)
{
allHaveFlag=false;
indexStr="";
break;
}
else
{
indexStr+=canvas.getAttribute("index");
}
}
}
if(allHaveFlag&&indexStr=="0123456789101112131415161718192021222324")
alert("恭喜您，您赢了！");
ev.preventDefault();
ev.stopPropagation();
}, false);
}
}
}
function handleFileSelect(f, image) {
// Only process image files.
if (!f.type.match('image.*')) {
return;
}
var reader = new FileReader();
// Closure to capture the file information.
reader.onload = (function(theFile) {
return function(e) {
image.src = e.target.result;
// Render thumbnail.
var span = document.createElement('span');
span.innerHTML = ['<img class="thumb" src="', e.target.result,
'" title="', escape(theFile.name), '"/>'].join('');
//document.insertBefore(span, null);
};
})(f);
// Read in the image file as a data URL.
reader.readAsDataURL(f);
}
</script>
</head>
<body onload="window_onload()">
<header>
<h1>HTML5结合使用Canvas API、文件API与拖放API制作拼图游戏</h1>
</header>
<div id="divMain">
<div id="divLeft">
<table border="0" cellspacing="1" cellpadding="1" id="leftTable">
<tr>
<td tag="td"></td>
<td tag="td"></td>
<td tag="td"></td>
<td tag="td"></td>
<td tag="td"></td>
</tr>
<tr>
<td tag="td"></td>
<td tag="td"></td>
<td tag="td"></td>
<td tag="td"></td>
<td tag="td"></td>
</tr>
<tr>
<td tag="td"></td>
<td tag="td"></td>
<td tag="td"></td>
<td tag="td"></td>
<td tag="td"></td>
</tr>
<tr>
<td tag="td"></td>
<td tag="td"></td>
<td tag="td"></td>
<td tag="td"></td>
<td tag="td"></td>
</tr>
<tr>
<td tag="td"></td>
<td tag="td"></td>
<td tag="td"></td>
<td tag="td"></td>
<td tag="td"></td>
</tr>
</table>
</div>
<div id="divRight">
<div id="divSelectPic">
选择文件：
<input type="file" id="file" onchange="selectFile()" accept="image/*"/>
<input type="button" id="createPuzzle" value="创建拼图" disabled="disabled" onclick="drawTable()" />
</div>
<div id="divShowPic">
请选择文件
</div>
<div id="divHiddenPic" />
</div>
</body>