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index.html
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<!DOCTYPE html>
<html>
<head>
<title>Pizzle 拼图</title>
<meta charset="utf8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, maximum-scale=1.0">
<style>
body {
margin: 0px;
background-color: #F2F2F2;
overflow: hidden;
}
header, footer {
position: relative;
background-color: black;
color: white;
height: 56px;
/* 让所有relative对象垂直居中 */
line-height: 56px;
padding-left: 20px;
font-size: 16pt;
}
footer {
display: none;
}
#switchAside {
width: 20px;
height: 32px;
display: inline-block;
vertical-align: middle;
margin-right: 20px;
/* 由于文字是四线三格，文字靠在第三条线上，而非中央 */
margin-top:10px;
}
#switchAside span {
width: 100%;
height: 3px;
background-color: white;
display: block;
}
/* nth-child(a*n+b)里面符合这个递推公式的都会应用该样式 */
#switchAside span:nth-child(n+2) {
margin-top: 5px;
}
#switchNav {
width: 4px;
height: 32px;
/* relative垂直居中对象增加10px margin，absolute对象只需增加5px */
top: 17px;
right: 0px;
display: inline-block;
position: absolute;
/* 增大接触面积 */
padding-left:20px;
padding-right:20px;
}
#switchNav span {
width: 100%;
height: 3px;
background-color: white;
display: block;
margin-top: 5px;
}
footer #step{
position: absolute;
top: 10px;
right: 20px;
line-height: 32px;
}
section {
position: relative;
}
#canvas {
border: 4px solid #CCCCCC;
display: block;
margin: 0px auto;
background-color: #F2F2F2;
}
#mask {
position: absolute;
width: 100%;
height: 100%;
background-color: rgba(0,0,0,0.5);
z-index: 1;
display: none;
}
nav {
position: absolute;
top: 56px;
right: 0px;
background-color: rgba(0,0,0,0.6);
z-index: 2;
transition: height 0.3s ease;
overflow: hidden;
color: white;
font-size: 16pt;
}
nav div:nth-child(n) {
padding: 20px 20px 0px 20px;
display: block;
}
nav div:last-child {
padding-bottom: 20px;
}
aside {
position: absolute;
top: 56px;
background-color: rgba(0,0,0,0.6);
z-index: 3;
transition: left 0.3s ease;
overflow-x: hidden;
}
aside img {
border: 4px solid #CCCCCC;
}
.selectedImg {
border-color: red;
}
</style>
</head>
<body>
<header>
<a id="switchAside" href="#" onclick="switchAside()">
<span></span>
<span></span>
<span></span>
</a>
Pizzle 拼图
<a id="switchNav" href="#" onclick="switchNav()">
<span></span>
<span></span>
<span></span>
</a>
</header>
<nav class="collapseCls">
<div><input id="switchIndexVisibleCb" type="checkbox" onchange="switchIndexVisible(event)">显示索引</div>
</nav>
<aside class="collapseCls">
</aside>
<section>
<div id="mask" onclick="collapseAll()"></div>
<canvas id="canvas">Your browser not support canvas</canvas>
</section>
<footer>
<div id="step"></div>
</footer>
</body>
<script type="text/javascript">
var imgUrlArray = [
"http://group.store.qq.com/qun/BS0xEDvzH2UFXErNQlgkNQ!!/V3t99aBItBQFFkYMLsQ/800?w5=640&h5=960&rf=viewer_421",
"http://group.store.qq.com/qun/BS0xEDvzH2UFXErNQlgkNQ!!/V3t99aBIs9QFFmksJ0e/800?w5=640&h5=853&rf=viewer_421",
"http://group.store.qq.com/qun/BS0xEDvzH2UFXErNQlgkNQ!!/V3t99aBIs5QFFn4Y8gm/800?w5=640&h5=1138&rf=viewer_421",
"http://group.store.qq.com/qun/BS0xEDvzH2UFXErNQlgkNQ!!/V3t99aBIs1QFFntnfIs/800?w5=640&h5=960&rf=viewer_421",
"http://group.store.qq.com/qun/BS0xEDvzH2UFXErNQlgkNQ!!/V3t99aBIsxQFFnMg.sl/800?w5=960&h5=640&rf=viewer_421",
"http://group.store.qq.com/qun/BS0xEDvzH2UFXErNQlgkNQ!!/V3t99aBIstQFFkNvO84/800?w5=725&h5=640&rf=viewer_421",
];
var imgArray = new Array(imgUrlArray.length);
//行数
var rowCount = 4;
//列数
var columnCount = 3;
//单元格总数
var count;
//单元格间隔
var padding = 4;
var doublePadding = padding * 2;
//文字颜色
var textColor = "red";
//是否按下
var isTouchStart = false;
//按下时的画布索引
var touchIndex = -1;
//点击时相对事件目标的坐标
var touchX,touchY;
//是否绘制在缓存上
var IN_CACHE = true;
//是否展开所有
var IS_EXPAND_ALL;
//时间戳差值(避免频繁的move事件，引起频繁的绘制操作)
var timestampDiff;
/*
时间戳
(1) Date.parse(new Date()) 得到秒*1000为时间戳
(2) (new Date()).valueOf() 得到毫秒时间戳
(3) new Date().getTime() 得到毫秒时间戳
*/
var timestamp,lastTimestamp=0;
//每个图片块的大小
var imgBlockWidth, imgBlockHeight;
//每个画布块的大小
var canvasBlockWidth, canvasBlockHeight;
var canvasBlockWidthWithPadding, canvasBlockHeightWithPadding;
var halfCanvasBlockWidth, halfCanvasBlockHeight;
//存放当前显示的图像编号
var indexArray;
var header = document.getElementsByTagName("header")[0];
var headerHeight = header.clientHeight;
var nav = document.getElementsByTagName("nav")[0];
var aside = document.getElementsByTagName("aside")[0];
var mask = document.getElementById("mask");
var switchNavBtn = document.getElementById("switchNav");
var switchAsideBtn = document.getElementById("switchAside");
var switchIndexVisibleCb = document.getElementById("switchIndexVisibleCb");
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var stepDiv = document.getElementById("step");
//步数
var step;
//拖动时缓存原始图
var cacheCanvas = document.createElement("canvas");
var cacheCanvasCtx = cacheCanvas.getContext("2d");
//拖动时缓存图块
var cacheBlock = document.createElement("canvas");
var cacheBlockCtx = cacheBlock.getContext("2d");
var canvasWidth = window.innerWidth - doublePadding;
//这里header的height不能用computedStyle，只能用clientHeight
var canvasHeight = window.innerHeight - header.clientHeight - doublePadding;
//避免图像过度拉伸
if(canvasWidth > canvasHeight) {
canvasWidth = canvasHeight;
}
cacheCanvas.width = canvas.width = canvasWidth;
cacheCanvas.height = canvas.height = canvasHeight;
canvasBlockWidthWithPadding = (canvasWidth + padding) / columnCount;
canvasBlockHeightWithPadding = (canvasHeight + padding) / rowCount;
cacheBlock.width = canvasBlockWidth = canvasBlockWidthWithPadding - padding;
cacheBlock.height = canvasBlockHeight = canvasBlockHeightWithPadding - padding;
halfCanvasBlockWidth = canvasBlockWidth / 2;
halfCanvasBlockHeight = canvasBlockHeight / 2;
var fontSize = Math.floor((canvasWidth < canvasHeight ? canvasWidth : canvasHeight) / 6);
var navHeight = nav.clientHeight;
var asideWidth = canvasWidth / 2;
aside.style.height = canvasHeight + doublePadding + "px";
//动态适配PC和手机布局(苹果6s分辨率：1334*750px)
var halfHorizontalLeft = (window.innerWidth - canvasHeight - doublePadding) / 2;
if(window.innerWidth > 800 && halfHorizontalLeft > 200) {
IS_EXPAND_ALL = true;
asideWidth = halfHorizontalLeft;
switchNavBtn.style.display = "none";
switchAsideBtn.style.display = "none";
nav.style.right = "0px";
nav.style.width = aside.style.width = asideWidth + "px";
nav.style.height = aside.style.height;
asideWidth = halfHorizontalLeft;
} else {
IS_EXPAND_ALL = false;
nav.style.height = "0px";
aside.style.width = asideWidth + "px";
aside.style.left = "-" + aside.style.width;
}
addImgArrayToAside();
if(imgArray[0].complete) {
img = imgArray[0];
reset();
} else {
imgArray.onload = function() {
img = imgArray[0];
reset();
}
}
//将图片添加到滑动栏上
function addImgArrayToAside() {
for(var i=0; i<imgUrlArray.length; i++) {
imgArray[i] = document.createElement("img");
imgArray[i].width = asideWidth - doublePadding;
imgArray[i].src = imgUrlArray[i];
imgArray[i].addEventListener("click", function(event) {
for(var j=0; j<imgArray.length; j++) {
imgArray[j].removeAttribute("class");
}
var index = imgArray.indexOf(this);
imgArray[index].setAttribute("class", "selectedImg");
if(imgArray[index].complete === true) {
img = imgArray[index];
reset();
collapseAll();
}
});
aside.appendChild(imgArray[i]);
}
}
//移除所有事件监听器
function removeAllListener() {
canvas.removeEventListener("mouseleave", onTouch);
canvas.removeEventListener("mousedown", onTouch);
canvas.removeEventListener("mousemove", onTouch);
canvas.removeEventListener("mouseup", onTouch);
canvas.removeEventListener("touchstart", onTouch);
canvas.removeEventListener("touchmove", onTouch);
canvas.removeEventListener("touchend", onTouch);
}
//当图片加载完成后，重置当前状态
function reset() {
removeAllListener();
//获取图片原始宽高进行计算
imgBlockWidth = img.naturalWidth / columnCount;
imgBlockHeight = img.naturalHeight / rowCount;
count = rowCount * columnCount;
indexArray = new Array(count);
for(var i=0; i<indexArray.length; i++) {
indexArray[i] = i;
}
//伪随机排序
//indexArray.sort(function(){ return 0.5 - Math.random() })
shuffle(indexArray);
console.log(indexArray);
drawMesh();
for(var i=0; i<indexArray.length; i++) {
drawBlock(i);
}
step = -1;
recordStep();
//不论鼠标指针离开被选元素还是任何子元素，都会触发 mouseout 事件
//canvas.addEventListener("mouseout", onTouch);
//只有在鼠标指针离开被选元素时，才会触发 mouseleave 事件
canvas.addEventListener("mouseleave", onTouch);
canvas.addEventListener("mousedown", onTouch, false);
canvas.addEventListener("mousemove", onTouch, false);
canvas.addEventListener("mouseup", onTouch, false);
canvas.addEventListener("touchstart", onTouch, false);
canvas.addEventListener("touchmove", onTouch, false);
canvas.addEventListener("touchend", onTouch, false);
}
// The shuffle modifies the original array calling array.slice(0) creates a copy, which is assigned to newArray
function shuffle(array) {
var currentIndex = array.length, temporaryValue, randomIndex;
// While there remain elements to shuffle...
while (0 !== currentIndex) {
// Pick a remaining element...
randomIndex = Math.floor(Math.random() * currentIndex);
currentIndex -= 1;
// And swap it with the current element.
temporaryValue = array[currentIndex];
array[currentIndex] = array[randomIndex];
array[randomIndex] = temporaryValue;
}
return array;
}
//绘制网格
function drawMesh() {
var pos;
var halfPadding = padding / 2;
//css虽然设置了border-color，但是这个color会被分别设置到每一条边，所以单用border-color是获取不到的
ctx.strokeStyle = window.getComputedStyle(canvas).borderBottomColor;
//ctx.strokeStyle = window.getComputedStyle(canvas).getPropertyValue("border-bottom-color");
ctx.lineWidth = padding;
//canvas绘制直线时是从直线的中点开始绘制的
for(var i=1; i<rowCount; i++) {
pos = canvasBlockHeightWithPadding * i - halfPadding;
ctx.beginPath();
ctx.moveTo(0, pos);
ctx.lineTo(canvasWidth, pos);
ctx.stroke();
}
for(var i=1; i<columnCount; i++) {
pos = canvasBlockWidthWithPadding * i - halfPadding;
ctx.beginPath();
ctx.moveTo(pos, 0);
ctx.lineTo(pos, canvasHeight);
ctx.stroke();
}
}
//获取索引块相对图像左上角的坐标
function getImagePositionByIndex(index) {
var x = index % columnCount;
var y = Math.floor(index / columnCount);
var posX = x * imgBlockWidth;
var posY = y * imgBlockHeight;
return [posX, posY];
}
//获取索引块相对画布左上角的坐标
function getCanvasPositionByIndex(index) {
var x = index % columnCount;
var y = Math.floor(index / columnCount);
var posX = x * canvasBlockWidthWithPadding;
var posY = y * canvasBlockHeightWithPadding;
return [posX, posY];
}
//在画布块中绘制图片
function drawBlock(index, isInCache) {
var imgPos = getImagePositionByIndex(indexArray[index]);
if(isInCache !== undefined && isInCache) {
cacheBlockCtx.drawImage(img, imgPos[0], imgPos[1], imgBlockWidth, imgBlockHeight, 0, 0, canvasBlockWidth, canvasBlockHeight);
} else {
var canvasPos = getCanvasPositionByIndex(index);
ctx.drawImage(img, imgPos[0], imgPos[1], imgBlockWidth, imgBlockHeight, canvasPos[0], canvasPos[1], canvasBlockWidth, canvasBlockHeight);
}
drawIndex(index, isInCache);
}
//清除某个画布块中的图像
function clearBlock(paramCtx, index) {
var canvasPos = getCanvasPositionByIndex(index);
paramCtx.clearRect(canvasPos[0], canvasPos[1], canvasBlockWidth, canvasBlockHeight);
}
//在图的第index区域中心，绘制索引
function drawIndex(index, isInCache) {
if(!switchIndexVisibleCb.checked) {
return;
}
var tmpCtx;
var canvasPos = [0, 0];
if(isInCache === undefined || !isInCache) {
canvasPos = getCanvasPositionByIndex(index);
tmpCtx = ctx;
} else {
tmpCtx = cacheBlockCtx;
}
tmpCtx.fillStyle = textColor;
//Horizontal alignment: center | start | end | left | right
tmpCtx.textAlign = "center";
//Vertical alignment: top | hanging | middle | alphabetic | ideographic | bottom
tmpCtx.textBaseline = "middle";
tmpCtx.font = "bold " + fontSize + "px Arial";
var x = canvasPos[0] + halfCanvasBlockWidth;
var y = canvasPos[1] + halfCanvasBlockHeight;
tmpCtx.fillText(indexArray[index], x, y);
}
//切换是否显示索引
function switchIndexVisible() {
for(var i=0;i<indexArray.length;i++) {
drawBlock(i);
}
}
//根据当前鼠标位置，获取索引(-1表示不在正常范围内)
function getCanvasIndexByPosition(x, y) {
if(x < 0 || x > canvasWidth || y < 0 || y > canvasHeight) {
return -1;
}
return Math.floor(x / canvasBlockWidthWithPadding) + Math.floor(y / canvasBlockHeightWithPadding) * columnCount;
}
function onTouch(event) {
if(event.touches) {
//touchend拿不到坐标点
if(event.touches.length > 0) {
touchX = event.touches[0].pageX;
touchY = event.touches[0].pageY - headerHeight;
}
} else {
touchX = event.offsetX;
touchY = event.offsetY;
}
//console.log(event.type)
switch(event.type) {
case "mousedown":
case "touchstart":
touchIndex = getCanvasIndexByPosition(touchX, touchY);
if(touchIndex !== -1) {
cacheAfterTouch();
}
break;
case "mousemove":
case "touchmove":
if(touchIndex !== -1) {
timestamp = new Date().getTime();
diffTimestamp = timestamp - lastTimestamp;
if(diffTimestamp > 100) {
lastTimestamp = timestamp;
ctx.clearRect(0, 0, canvasWidth, canvasHeight);
ctx.drawImage(cacheCanvas, 0, 0);
ctx.drawImage(cacheBlock, touchX - halfCanvasBlockWidth, touchY - halfCanvasBlockHeight);
}
}
break;
case "mouseup":
case "touchend":
if(touchIndex != -1) {
var changeIndex = getCanvasIndexByPosition(touchX, touchY);
restoreAfterTouch(changeIndex);
recordStep();
}
break;
case "mouseleave":
restoreAfterTouch(-1);
break;
}
}
function cacheAfterTouch() {
if(touchIndex !== -1) {
//缓存图块
drawBlock(touchIndex, IN_CACHE);
//缓存画布
cacheCanvasCtx.drawImage(canvas, 0, 0);
//清除触摸块
clearBlock(cacheCanvasCtx, touchIndex);
}
}
function restoreAfterTouch(changeIndex) {
if(touchIndex !== -1) {
ctx.drawImage(cacheCanvas, 0, 0);
if(changeIndex === -1 || touchIndex === changeIndex) {
drawBlock(touchIndex);
} else {
swapBlock(touchIndex, changeIndex);
}
touchIndex = -1;
}
}
//交换当前画布上的两个图块
function swapBlock(index1, index2) {
var tmp = indexArray[index1];
indexArray[index1] = indexArray[index2];
indexArray[index2] = tmp;
drawBlock(index1);
drawBlock(index2);
}
//关闭"侧滑栏"和"导航栏"
function collapseAll() {
if(IS_EXPAND_ALL) {
return;
}
mask.style.display = "none";
nav.style.height = "0px";
aside.style.left = "-" + aside.style.width;
}
//切换"导航栏"打开和关闭的状态
function switchNav() {
//注意string值默认为空，而不是undefined
var isHidden = nav.style.height === "" || nav.style.height === "0px";
collapseAll();
if(isHidden) {
mask.style.display = "block";
nav.style.height = navHeight + "px";
}
}
//切换"侧滑栏"打开和关闭的状态
function switchAside() {
var isHidden = aside.style.left === "" || aside.style.left !== "0px";
collapseAll();
if(isHidden) {
mask.style.display = "block";
aside.style.left = "0px";
}
}
//步数加一，同时更新显示
function recordStep() {
step++;
var stepStr = step.toString();
//补全到3位
var left = 3 - stepStr.length;
while(left > 0) {
//两个空格是一个字符的宽度，一个汉字占两字符宽度
stepStr = " " + stepStr;
left--;
}
stepDiv.innerHTML = "步数：" + stepStr;
}
</script>
</html>