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    html5版canvas自由拼图实例

    本文实例讲述了html5版canvas自由拼图的实现方法。分享给大家供大家参考。具体方法如下:

    代码运行效果如下图所示:

     

    canvasElement.js代码如下:


    复制代码
    代码如下:
    define('canvasElement', [ '../multi_upload/core' ], function(S) {
    var Canvas = window.Canvas || {};
    (function () {
    Canvas.Element = function() {};
    Canvas.Element.prototype.fillBackground = true;
    Canvas.Element.prototype.showcorners = false;
    Canvas.Element.prototype.photoborder = true;
    Canvas.Element.prototype.polaroid = false;
    Canvas.Element.prototype._backgroundImg = null;
    Canvas.Element.prototype._groupSelector = null;
    Canvas.Element.prototype._aImages = null;
    Canvas.Element.prototype._oContext = null;
    Canvas.Element.prototype._oElement = null;
    Canvas.Element.prototype._oConfig = null;
    Canvas.Element.prototype._currentTransform = null;
    Canvas.Element.prototype._prevTransform = null;
    Canvas.Element.prototype.curAngle = null;
    Canvas.Element.prototype.init = function(el, oConfig) {
    if (el == '') {
    return;
    }
    this._initElement(el);
    this._initConfig(oConfig);
    this._createCanvasBackground();
    this._createContainer();
    this._initEvents();
    this._initCustomEvents();
    };
    Canvas.Element.prototype._initElement = function(el) {
    this._oElement = document.getElementById(el);
    this._oContextTop = this._oElement.getContext('2d');
    };
    Canvas.Element.prototype._initCustomEvents = function() {
    this.onRotateStart = new Canvas.CustomEvent('onRotateStart');
    this.onRotateMove = new Canvas.CustomEvent('onRotateMove');
    this.onRotateComplete = new Canvas.CustomEvent('onRotateComplete');
    this.onDragStart = new Canvas.CustomEvent('onDragStart');
    this.onDragMove = new Canvas.CustomEvent('onDragMove');
    this.onDragComplete = new Canvas.CustomEvent('onDragComplete');
    };
    Canvas.Element.prototype._initConfig = function(oConfig) {
    this._oConfig = oConfig;
    this._oElement.width = this._oConfig.width;
    this._oElement.height = this._oConfig.height;
    this._oElement.style.width = this._oConfig.width + 'px';
    this._oElement.style.height = this._oConfig.height + 'px';
    };
    Canvas.Element.prototype._initEvents = function() {
    var _this=this;
    S(this._oElement).on('mousedown',function(e){
    _this.onMouseDown(e);
    });
    S(this._oElement).on( 'mouseup', function(e){
    _this.onMouseUp(e);
    });
    S(this._oElement).on('mousemove', function(e){
    _this.onMouseMove(e);
    });
    };
    Canvas.Element.prototype._createContainer = function() {
    var canvasEl = document.createElement('canvas');
    canvasEl.id = this._oElement.id + '-canvas-container';
    var oContainer = this._oElement.parentNode.insertBefore(canvasEl, this._oElement);
    oContainer.width = this._oConfig.width;
    oContainer.height = this._oConfig.height;
    oContainer.style.width = this._oConfig.width + 'px';
    oContainer.style.height = this._oConfig.height + 'px';
    this._oContextContainer = oContainer.getContext('2d');
    };
    Canvas.Element.prototype._createCanvasBackground = function() {
    var canvasEl = document.createElement('canvas');
    canvasEl.id = this._oElement.id + '-canvas-background';
    var oBackground = this._oElement.parentNode.insertBefore(canvasEl, this._oElement);
    oBackground.width = this._oConfig.width;
    oBackground.height = this._oConfig.height;
    oBackground.style.width = this._oConfig.width + 'px';
    oBackground.style.height = this._oConfig.height + 'px';
    this._oContextBackground = oBackground.getContext('2d');
    };
    Canvas.Element.prototype.setCanvasBackground = function(oImg) {
    this._backgroundImg = oImg;
    var originalImgSize = oImg.getOriginalSize();
    this._oContextBackground.drawImage(oImg._oElement, 0, 0, originalImgSize.width, originalImgSize.height);
    };
    Canvas.Element.prototype.onMouseUp = function(e) {
    if (this._aImages == null) {
    return;
    }
    if (this._currentTransform) {
    this._currentTransform.target.setImageCoords();
    }
    if (this._currentTransform != null && this._currentTransform.action == "rotate") {
    this.onRotateComplete.fire(e);
    } else if (this._currentTransform != null && this._currentTransform.action == "drag") {
    this.onDragComplete.fire(e);
    }
    this._currentTransform = null;
    this._groupSelector = null;
    this.renderTop();
    };
    Canvas.Element.prototype.onMouseDown = function(e) {
    var mp = this.findMousePosition(e);
    if (this._currentTransform != null || this._aImages == null) {
    return;
    }
    var oImg = this.findTargetImage(mp, false);
    if (!oImg) {
    this._groupSelector = { ex: mp.ex, ey: mp.ey,
    top: 0, left: 0 };
    }
    else {
    var action = (!this.findTargetCorner(mp, oImg)) ? 'drag' : 'rotate';
    if (action == "rotate") {
    this.onRotateMove.fire(e);
    } else if (action == "drag") {
    this.onDragMove.fire(e);
    }
    this._prevTransform=this._currentTransform = {
    target: oImg,
    action: action,
    scalex: oImg.scalex,
    offsetX: mp.ex - oImg.left,
    offsetY: mp.ey - oImg.top,
    ex: mp.ex, ey: mp.ey,
    left: oImg.left, top: oImg.top,
    theta: oImg.theta
    };
    $('canvas_menu').style.transform='rotate('+oImg.theta*180/3.14+'deg)';
    $('canvas_menu').style.left=oImg.left+"px";
    $('canvas_menu').style.top=oImg.top+"px";
    $('canvas_menu').style.display="block";
    this.renderAll(false,false);
    }
    };
    Canvas.Element.prototype.onMouseMove = function(e) {
    var mp = this.findMousePosition(e);
    if (this._aImages == null) {
    return;
    }
    if (this._groupSelector != null) {
    this._groupSelector.left = mp.ex - this._groupSelector.ex;
    this._groupSelector.top = mp.ey - this._groupSelector.ey;
    this.renderTop();
    }
    else if (this._currentTransform == null) {
    var targetImg = this.findTargetImage(mp, true);
    this.setCursor(mp, targetImg);
    }
    else {
    if (this._currentTransform.action == 'rotate') {
    this.rotateImage(mp);
    this.scaleImage(mp);
    this.onRotateMove.fire(e);
    }
    else {
    this.translateImage(mp);
    this.onDragMove.fire(e);
    }
    this.renderTop();
    }
    };
    Canvas.Element.prototype.translateImage = function(mp) {
    this._currentTransform.target.left = mp.ex - this._currentTransform.offsetX;
    this._currentTransform.target.top = mp.ey - this._currentTransform.offsetY;
    $('canvas_menu').style.left=this._currentTransform.target.left+"px";
    $('canvas_menu').style.top=this._currentTransform.target.top +"px";
    };
    Canvas.Element.prototype.scaleImage = function(mp) {
    var lastLen =
    Math.sqrt(Math.pow(this._currentTransform.ey - this._currentTransform.top, 2) +
    Math.pow(this._currentTransform.ex - this._currentTransform.left, 2));
    var curLen =
    Math.sqrt(Math.pow(mp.ey - this._currentTransform.top, 2) +
    Math.pow(mp.ex - this._currentTransform.left, 2));
    var curScalex= this._currentTransform.scalex * (curLen / lastLen);
    var curScaley=this._currentTransform.target.scalex;
    if(curScalex>0.7&&curScaley>0.7){
    this._currentTransform.target.scalex =curScalex;
    this._currentTransform.target.scaley = curScaley;
    }
    };
    Canvas.Element.prototype.rotateImage = function(mp) {
    var lastAngle = Math.atan2(
    this._currentTransform.ey - this._currentTransform.top,
    this._currentTransform.ex - this._currentTransform.left
    );

    var curAngle = Math.atan2(
    mp.ey - this._currentTransform.top,
    mp.ex - this._currentTransform.left
    );
    this._currentTransform.target.theta = (curAngle - lastAngle) + this._currentTransform.theta;
    this.curAngle=this._currentTransform.target.theta*180/3.14;
    $('canvas_menu').style.transform='rotate('+this.curAngle+'deg)';
    };
    Canvas.Element.prototype.setCursor = function(mp, targetImg) {
    if (!targetImg) {
    this._oElement.style.cursor = 'default';
    }
    else {
    var corner = this.findTargetCorner(mp, targetImg);
    if (!corner)
    {
    this._oElement.style.cursor = 'default';
    }
    else
    {
    if(corner == 'tr') {
    this._oElement.style.cursor = 'ne-resize';
    }
    else if(corner == 'br') {
    this._oElement.style.cursor = 'se-resize';
    }
    else if(corner == 'bl') {
    this._oElement.style.cursor = 'sw-resize';
    }
    else if(corner == 'tl') {
    this._oElement.style.cursor = 'nw-resize';
    }
    else {
    this._oElement.style.cursor = 'default';
    }
    }
    }
    };
    Canvas.Element.prototype.addImage = function(oImg) {
    if(S.isEmptyObject(this._aImages)) {
    this._aImages = [];
    }
    this._aImages.push(oImg);
    this.renderAll(false,true);</p> <p> };
    Canvas.Element.prototype.renderAll = function(allOnTop,allowCorners) {
    var containerCanvas = (allOnTop) ? this._oContextTop : this._oContextContainer;
    this._oContextTop.clearRect(0,0,parseInt(this._oConfig.width), parseInt(this._oConfig.height));
    containerCanvas.clearRect(0,0,parseInt(this._oConfig.width), parseInt(this._oConfig.height));
    if (allOnTop) {
    var originalImgSize = this._backgroundImg.getOriginalSize();
    this._oContextTop.drawImage(this._backgroundImg._oElement, 0, 0, originalImgSize.width, originalImgSize.height);
    }
    for (var i = 0, l = this._aImages.length-1; i < l; i += 1) {
    this.drawImageElement(containerCanvas, this._aImages[i],allowCorners);
    }
    this.drawImageElement(this._oContextTop, this._aImages[this._aImages.length-1],allowCorners);
    };
    Canvas.Element.prototype.renderTop = function() {
    this._oContextTop.clearRect(0,0,parseInt(this._oConfig.width), parseInt(this._oConfig.height));
    this.drawImageElement(this._oContextTop, this._aImages[this._aImages.length-1],true);
    if (this._groupSelector != null) {
    this._oContextTop.fillStyle = "rgba(0, 0, 200, 0.5)";
    this._oContextTop.fillRect(
    this._groupSelector.ex - ((this._groupSelector.left > 0) ?
    0 : - this._groupSelector.left),
    this._groupSelector.ey - ((this._groupSelector.top > 0) ?
    0 : - this._groupSelector.top),
    Math.abs(this._groupSelector.left),
    Math.abs(this._groupSelector.top)
    );
    this._oContextTop.strokeRect(
    this._groupSelector.ex - ((this._groupSelector.left > 0) ?
    0 : Math.abs(this._groupSelector.left)),
    this._groupSelector.ey - ((this._groupSelector.top > 0) ?
    0 : Math.abs(this._groupSelector.top)),
    Math.abs(this._groupSelector.left),
    Math.abs(this._groupSelector.top)
    );
    }
    };
    Canvas.Element.prototype.drawImageElement = function(context, oImg,allowCorners) {
    oImg.cornervisibility=allowCorners;
    var offsetY = oImg.height / 2;
    var offsetX = oImg.width / 2;
    context.save();
    context.translate(oImg.left, oImg.top);
    context.rotate(oImg.theta);
    context.scale(oImg.scalex, oImg.scaley);
    this.drawBorder(context, oImg, offsetX, offsetY);
    var originalImgSize = oImg.getOriginalSize();
    var polaroidHeight = ((oImg.height - originalImgSize.height) - (oImg.width - originalImgSize.width))/2;
    context.drawImage(
    oImg._oElement,
    - originalImgSize.width/2,
    ((- originalImgSize.height)/2 - polaroidHeight),
    originalImgSize.width,
    originalImgSize.height
    );
    if (oImg.cornervisibility) {
    this.drawCorners(context, oImg, offsetX, offsetY);
    }
    context.restore();
    };
    Canvas.Element.prototype._getImageLines = function(oCoords) {
    return {
    topline: {
    o: oCoords.tl,
    d: oCoords.tr
    },
    rightline: {
    o: oCoords.tr,
    d: oCoords.br
    },
    bottomline: {
    o: oCoords.br,
    d: oCoords.bl
    },
    leftline: {
    o: oCoords.bl,
    d: oCoords.tl
    }
    };
    };
    Canvas.Element.prototype.findTargetImage = function(mp, hovering) {
    for (var i = this._aImages.length-1; i >= 0; i -= 1) {
    var iLines = this._getImageLines(this._aImages[i].oCoords);
    var xpoints = this._findCrossPoints(mp, iLines);
    if (xpoints % 2 == 1 && xpoints != 0) {
    var target = this._aImages[i];
    if (!hovering) {
    this._aImages.splice(i, 1);
    this._aImages.push(target);
    }
    return target;
    }
    }
    return false;
    };
    Canvas.Element.prototype._findCrossPoints = function(mp, oCoords) {
    var b1, b2, a1, a2, xi, yi;
    var xcount = 0;
    var iLine = null;
    for (lineKey in oCoords) {
    iLine = oCoords[lineKey];
    if ((iLine.o.y < mp.ey) && (iLine.d.y < mp.ey)) {
    continue;
    }
    if ((iLine.o.y >= mp.ey) && (iLine.d.y >= mp.ey)) {
    continue;
    }
    if ((iLine.o.x == iLine.d.x) && (iLine.o.x >= mp.ex)) {
    xi = iLine.o.x;
    yi = mp.ey;
    }
    else {
    b1 = 0;
    b2 = (iLine.d.y-iLine.o.y)/(iLine.d.x-iLine.o.x);
    a1 = mp.ey-b1*mp.ex;
    a2 = iLine.o.y-b2*iLine.o.x;
    xi = - (a1-a2)/(b1-b2);
    yi = a1+b1*xi;
    }
    if (xi >= mp.ex) {
    xcount += 1;
    }
    if (xcount == 2) {
    break;
    }
    }
    return xcount;
    };
    Canvas.Element.prototype.findTargetCorner = function(mp, oImg) {
    var xpoints = null;
    var corners = ['tl','tr','br','bl'];
    for (var i in oImg.oCoords) {
    xpoints = this._findCrossPoints(mp, this._getImageLines(oImg.oCoords[i].corner));
    if (xpoints % 2 == 1 && xpoints != 0) {
    return i;
    }
    }
    return false;
    };
    Canvas.Element.prototype.findMousePosition = function(e) {
    var parentNode = (e.srcElement) ? e.srcElement.parentNode : e.target.parentNode;
    var isSafari2 = !S.support.ie&&!S.support.firefox;
    var scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;
    var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
    var safariOffsetLeft = (isSafari2) ? e.target.ownerDocument.body.offsetLeft + scrollLeft : 0;
    var safariOffsetTop = (isSafari2) ? e.target.ownerDocument.body.offsetTop + scrollTop : 0;
    return {
    ex: e.clientX + scrollLeft - parentNode.offsetLeft - safariOffsetLeft,
    ey: e.clientY + scrollTop - parentNode.offsetTop - safariOffsetTop,
    screenX: e.screenX,
    screenY: e.screenY
    };
    };
    Canvas.Element.prototype.drawBorder = function(context, oImg, offsetX, offsetY) {
    var outlinewidth = 2;
    context.fillStyle = 'rgba(0, 0, 0, .3)';
    context.fillRect(-2 - offsetX, -2 - offsetY, oImg.width + (2 * outlinewidth), oImg.height + (2 * outlinewidth));
    context.fillStyle = '#fff';
    context.fillRect(-offsetX, -offsetY, oImg.width, oImg.height);
    };
    Canvas.Element.prototype.drawCorners = function(context, oImg, offsetX, offsetY) {
    context.fillStyle = "rgba(0, 200, 50, 0.5)";
    context.fillRect(-offsetX, -offsetY, oImg.cornersize, oImg.cornersize);
    context.fillRect(oImg.width - offsetX - oImg.cornersize, -offsetY, oImg.cornersize, oImg.cornersize);
    context.fillRect(-offsetX, oImg.height - offsetY - oImg.cornersize, oImg.cornersize, oImg.cornersize);
    context.fillRect(oImg.width - offsetX - oImg.cornersize, oImg.height - offsetY - oImg.cornersize, oImg.cornersize, oImg.cornersize);
    };
    Canvas.Element.prototype.clearCorners = function(context, oImg, offsetX, offsetY) {
    context.clearRect(-offsetX, -offsetY, oImg.cornersize, oImg.cornersize);
    context.clearRect(oImg.width - offsetX - oImg.cornersize, -offsetY, oImg.cornersize, oImg.cornersize);
    context.clearRect(-offsetX, oImg.height - offsetY - oImg.cornersize, oImg.cornersize, oImg.cornersize);
    context.clearRect(oImg.width - offsetX - oImg.cornersize, oImg.height - offsetY - oImg.cornersize, oImg.cornersize, oImg.cornersize);
    context.restore();
    };
    Canvas.Element.prototype.canvasTo = function(format) {
    this.renderAll(true,false);
    var containerCanvas =this._oContextTop;
    for (var i = 0, l = this._aImages.length; i < l; i += 1) {
    var offsetY = this._aImages[i].height / 2;
    var offsetX = this._aImages[i].width / 2;
    this.clearCorners(containerCanvas, this._aImages[i], offsetX, offsetY);
    }
    if (format == 'jpeg' || format == 'png') {
    return this._oElement.toDataURL('image/'+format);
    }
    };
    Canvas.CustomEvent = function(type) {
    this.type = type;
    this.scope = null;
    this.handler = null;
    var self = this;
    this.fire = function(e) {
    if(this.handler != null) {
    self.handler.call(self.scope, e);
    }
    };
    };
    }());
    return Canvas;
    });

    canvasImg.js代码如下:


    复制代码
    代码如下:
    define('canvasImg', [ '../multi_upload/core' ], function(S) {
    var Canvas = window.Canvas || {};
    (function () {
    Canvas.Img = function(el, oConfig) {
    this._initElement(el);
    this._initConfig(oConfig);
    this.setImageCoords();
    };
    Canvas.Img.CSS_CANVAS = "canvas-img";
    var DEFAULT_CONFIG = {
    "TOP": {
    key: "top",
    value: 10
    },
    "LEFT": {
    key: "left",
    value: 10
    },
    "ANGLE": {
    key: "angle",
    value: 0
    },
    "THETA": {
    key: "theta",
    value: 0
    },
    "SCALE-X": {
    key: "scalex",
    value: 1
    },
    "SCALE-Y": {
    key: "scaley",
    value: 1
    },
    "CORNERSIZE": {
    key: "cornersize",
    value:10
    },
    "BORDERWIDTH": {
    key: "borderwidth",
    value: 10
    },
    "POLAROIDHEIGHT": {
    key: "polaroidheight",
    value: 40
    },
    "RANDOMPOSITION": {
    key: "randomposition",
    value: true
    }
    };
    Canvas.Img.prototype._oElement = null;
    Canvas.Img.prototype.top = null;
    Canvas.Img.prototype.left = null;
    Canvas.Img.prototype.maxwidth = null;
    Canvas.Img.prototype.maxheight = null;
    Canvas.Img.prototype.oCoords = null;
    Canvas.Img.prototype.angle = null;
    Canvas.Img.prototype.theta = null;
    Canvas.Img.prototype.scalex = null;
    Canvas.Img.prototype.scaley = null;
    Canvas.Img.prototype.cornersize = null;
    Canvas.Img.prototype.polaroidheight = null;
    Canvas.Img.prototype.randomposition = null;
    Canvas.Img.prototype.selected = false;
    Canvas.Img.prototype.bordervisibility = false;
    Canvas.Img.prototype.cornervisibility = false;
    Canvas.Img.prototype._initElement = function(el) {
    this._oElement = el;
    };
    Canvas.Img.prototype._initConfig = function(oConfig) {
    var sKey;
    for (sKey in DEFAULT_CONFIG) {
    var defaultKey = DEFAULT_CONFIG[sKey].key;
    if (!oConfig.hasOwnProperty(defaultKey)) { // = !(defaultKey in oConfig)
    this[defaultKey] = DEFAULT_CONFIG[sKey].value;
    }
    else {
    this[defaultKey] = oConfig[defaultKey];
    }
    }
    if (this.bordervisibility) {
    this.currentBorder = this.borderwidth;
    }
    else {
    this.currentBorder = 0;
    }
    var normalizedSize = this.getNormalizedSize(this._oElement, parseInt(oConfig.maxwidth), parseInt(oConfig.maxheight));
    this._oElement.width = normalizedSize.width;
    this._oElement.height = normalizedSize.height;
    this.width = normalizedSize.width + (2 * this.currentBorder);
    this.height = normalizedSize.height + (2 * this.currentBorder);
    if (this.randomposition) {
    this._setRandomProperties(oConfig);
    }
    this.theta = this.angle * (Math.PI/180);
    };
    Canvas.Img.prototype.getNormalizedSize = function(oImg, maxwidth, maxheight) {
    if (maxheight && maxwidth && (oImg.width > oImg.height && (oImg.width / oImg.height) < (maxwidth / maxheight))) {
    normalizedWidth = Math.floor((oImg.width * maxheight) / oImg.height);
    normalizedHeight = maxheight;
    }
    else if (maxheight && ((oImg.height == oImg.width) || (oImg.height > oImg.width) || (oImg.height > maxheight))) {
    normalizedWidth = Math.floor((oImg.width * maxheight) / oImg.height);
    normalizedHeight = maxheight;
    }
    else if (maxwidth && (maxwidth < oImg.width)){
    normalizedHeight = Math.floor((oImg.height * maxwidth) / oImg.width);
    normalizedWidth = maxwidth;
    }
    else {
    normalizedWidth = oImg.width;
    normalizedHeight = oImg.height;
    }
    return { width: normalizedWidth, height: normalizedHeight }
    },
    Canvas.Img.prototype.getOriginalSize = function() {
    return { width: this._oElement.width, height: this._oElement.height }
    };
    Canvas.Img.prototype._setRandomProperties = function(oConfig) {
    if (oConfig.angle == null) {
    this.angle = (Math.random() * 90);
    }
    if (oConfig.top == null) {
    this.top = this.height / 2 + Math.random() * 450;
    }
    if (oConfig.left == null) {
    this.left = this.width / 2 + Math.random() * 600;
    }
    };
    Canvas.Img.prototype.setCornersVisibility = function(visible) {
    this.cornervisibility = visible;
    };
    Canvas.Img.prototype.setImageCoords = function() {
    this.left = parseInt(this.left);
    this.top = parseInt(this.top);
    this.currentWidth = parseInt(this.width) * this.scalex;
    this.currentHeight = parseInt(this.height) * this.scalex;
    this._hypotenuse = Math.sqrt(Math.pow(this.currentWidth / 2, 2) + Math.pow(this.currentHeight / 2, 2));
    this._angle = Math.atan(this.currentHeight / this.currentWidth);
    var offsetX = Math.cos(this._angle + this.theta) * this._hypotenuse;
    var offsetY = Math.sin(this._angle + this.theta) * this._hypotenuse;
    var theta = this.theta;
    var sinTh = Math.sin(theta);
    var cosTh = Math.cos(theta);
    var tl = {
    x: this.left - offsetX,
    y: this.top - offsetY
    };
    var tr = {
    x: tl.x + (this.currentWidth * cosTh),
    y: tl.y + (this.currentWidth * sinTh)
    };
    var br = {
    x: tr.x - (this.currentHeight * sinTh),
    y: tr.y + (this.currentHeight * cosTh)
    };
    var bl = {
    x: tl.x - (this.currentHeight * sinTh),
    y: tl.y + (this.currentHeight * cosTh)
    };
    this.oCoords = { tl: tl, tr: tr, br: br, bl: bl };
    this.setCornerCoords();
    };
    Canvas.Img.prototype.setCornerCoords = function() {
    var coords = this.oCoords;
    var theta = this.theta;
    var cosOffset = this.cornersize * this.scalex * Math.cos(theta);
    var sinOffset = this.cornersize * this.scalex * Math.sin(theta);
    coords.tl.corner = {
    tl: {
    x: coords.tl.x,
    y: coords.tl.y
    },
    tr: {
    x: coords.tl.x + cosOffset,
    y: coords.tl.y + sinOffset
    },
    bl: {
    x: coords.tl.x - sinOffset,
    y: coords.tl.y + cosOffset
    }
    };
    coords.tl.corner.br = {
    x: coords.tl.corner.tr.x - sinOffset,
    y: coords.tl.corner.tr.y + cosOffset
    };

    coords.tr.corner = {
    tl: {
    x: coords.tr.x - cosOffset,
    y: coords.tr.y - sinOffset
    },
    tr: {
    x: coords.tr.x,
    y: coords.tr.y
    },
    br: {
    x: coords.tr.x - sinOffset,
    y: coords.tr.y + cosOffset
    }
    };
    coords.tr.corner.bl = {
    x: coords.tr.corner.tl.x - sinOffset,
    y: coords.tr.corner.tl.y + cosOffset
    };

    coords.bl.corner = {
    tl: {
    x: coords.bl.x + sinOffset,
    y: coords.bl.y - cosOffset
    },
    bl: {
    x: coords.bl.x,
    y: coords.bl.y
    },
    br: {
    x: coords.bl.x + cosOffset,
    y: coords.bl.y + sinOffset
    }
    };
    coords.bl.corner.tr = {
    x: coords.bl.corner.br.x + sinOffset,
    y: coords.bl.corner.br.y - cosOffset
    };

    coords.br.corner = {
    tr: {
    x: coords.br.x + sinOffset,
    y: coords.br.y - cosOffset
    },
    bl: {
    x: coords.br.x - cosOffset,
    y: coords.br.y - sinOffset
    },
    br: {
    x: coords.br.x,
    y: coords.br.y
    }
    };
    coords.br.corner.tl = {
    x: coords.br.corner.bl.x + sinOffset,
    y: coords.br.corner.bl.y - cosOffset
    };
    };
    }());
    return Canvas;
    });

    puzzle.html代码如下:


    复制代码
    代码如下:
    <!DOCTYPE html>
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    <link type="text/css" href="html5_puzzle.css" rel="stylesheet" />
    <script type="text/javascript" src="../multi_upload/seed.js"></script>
    <script type="text/javascript" src='html5_puzzle.js'></script>
    </head>
    <body>
    <div id='html5_puzzle'>
    <div id='puzzle_left'>
    <div class='puzzle_column'>
    <ul>
    <li><img src='small_img/1.jpg' data-index='1' /></li>
    <li><img src='small_img/2.jpg' data-index='2' /></li>
    <li><img src='small_img/3.jpg' data-index='3' /></li>
    <li><img src='small_img/4.jpg' data-index='4' /></li>
    <li><img src='small_img/5.jpg' data-index='5' /></li>
    </ul>
    </div>
    <div class='puzzle_column'>
    <ul>
    <li><img src='small_img/6.jpg' data-index='6' /></li>
    <li><img src='small_img/7.jpg' data-index='7' /></li>
    <li><img src='small_img/8.jpg' data-index='8' /></li>
    <li><img src='small_img/9.jpg' data-index='9' /></li>
    <li><img src='small_img/10.jpg' data-index='10' /></li>
    </ul>
    </div>
    </div>
    <div id='puzzle_right'>
    <div id='puzzle_canvas'>
    <canvas id="canvid1"></canvas>
    <div id='canvas_menu'>
    <a href='javascript:void(0)' id='photo_delete'>删除</a> <a
    href='javascript:void(0)' id='photo_update'>更改图片</a>
    </div>
    </div>
    <img id="bg" src="big_img/1.jpg" width='600' height='450' />
    </div>
    <div id='puzzle_bottom'>
    <a href='javascript:void(0)' id='add_img'><span>添加图片</span><input
    type="file" multiple="" id='fileImage'> </a> <a
    href='javascript:void(0)' id='upload_btn'>上传</a> <a>点击图片可以旋转,拖拽,
    缩放哦!</a>
    </div>
    </div>
    <input type="file" id='test'>
    <canvas id='test_canvas'></canvas>
    </body>
    </html>

    html5_puzzle.css代码如下:


    复制代码
    代码如下:
    @CHARSET "UTF-8";</p> <p>#html5_puzzle {
    font-size: 0;
    }</p> <p>canvas {
    background-color: transparent;
    left: 0;
    position: absolute;
    top: 0;
    }</p> <p>.puzzle_column,#puzzle_left,#puzzle_right,#add_img {
    display: inline-block;
    }</p> <p>.puzzle_column li {
    display: block;
    margin: 5px;
    border: 1px solid #ffffff;
    }</p> <p>.puzzle_column li:hover {
    border: 1px solid #3B5998;
    cursor: pointer;
    }</p> <p>.puzzle_column {
    font-size: 0;
    }</p> <p>#puzzle_left,#puzzle_right {
    border: 1px solid #3B5998;
    }</p> <p>#puzzle_right,#puzzle_bottom a {
    font-size: 14px;
    margin: 10px 0 0 10px;
    }</p> <p>#puzzle_bottom {
    margin: 5px 0;
    }</p> <p>#puzzle_canvas img {

    }</p> <p>#puzzle_canvas {
    overflow: hidden;
    width: 600px;
    height: 450px;
    position: relative;
    }</p> <p>#add_img input {
    position: absolute;
    font-size: 100px;
    right: 0;
    top: 0;
    opacity: 0;
    }</p> <p>#add_img {
    position: relative;
    display: inline-block;
    background: #3B5998;
    border-radius: 4px;
    padding: 4px 12px;
    overflow: hidden;
    color: #ffffff;
    }</p> <p>#bg,#show_list {
    display: none;
    }</p> <p>#canvas_menu {
    border: 1px solid red;
    position: absolute;
    z-index: 5;
    top: 0;
    left: 0;
    display: none;
    }</p> <p>#canvas_menu a {
    display: inline-block;
    }</p> <p>#test_canvas {
    top: 700px;
    }

    html5_puzzle.js代码如下:


    复制代码
    代码如下:
    require([ 'img_upload', '../puzzle/canvasImg', '../puzzle/canvasElement' ], function(
    S, canvasImg, canvasElement) {
    var img=[];
    var canvas = new canvasElement.Element();
    canvas.init('canvid1', {
    width : 600,
    height : 450
    });
    S('.puzzle_column img').on('click',function(e){
    var index=this.getAttribute('data-index');
    $('bg').onload = function() {
    var ctx=$('canvid1-canvas-background').getContext('2d');
    ctx.clearRect(0, 0,600,450);
    img[0]=new canvasImg.Img($('bg'), {});
    canvas.setCanvasBackground(img[0]);
    };
    $('bg').setAttribute('src','medium_img/'+index+'.jpg');
    e.stopPropagation();
    });
    var CanvasDemo = function() {
    return {
    init : function() {
    var img_list=dom.query('#puzzle_canvas img');
    img[0]=new canvasImg.Img($('bg'), {});
    S.each(img_list,function(i,el){
    el.setAttribute('data-index',i);
    img.push(new canvasImg.Img(el, {}));
    canvas.addImage(img[i+1]);
    });
    canvas.setCanvasBackground(img[0]);
    this.cornersvisible = (this.cornersvisible) ? false : true;
    this.modifyImages(function(image) {
    image.setCornersVisibility(this.cornersvisible);
    });
    },
    modifyImages : function(fn) {
    for ( var i =0, l = canvas._aImages.length; i < l; i += 1) {
    fn.call(this, canvas._aImages[i]);
    }
    canvas.renderAll(false,false);
    S('#puzzle_canvas img').remove();
    img = [];
    }
    };
    }();
    function getCurImg(){
    var oImg=canvas._prevTransform.target;
    for(var i=0;i<canvas._aImages.length;i++){
    if(canvas._aImages[i]._oElement.src==oImg._oElement.src){
    return i;
    }
    }
    }
    S('#photo_delete').on('click',function(e){
    var i=getCurImg();
    canvas._aImages.splice(i,1);
    canvas.renderAll(true,true);
    $('canvas_menu').style.display="none";
    });
    S('#photo_update').on('click',function(e){
    $('test').click();
    });
    S('#test').on('change',function(e){
    var files = e.target.files || e.dataTransfer.files;
    var reader = new FileReader();
    reader.onload = (function() {
    return function(e) {
    var dataURL = e.target.result, canvas1 = document.querySelector('#test_canvas'), ctx = canvas1.getContext('2d'), img = new Image();
    img.onload = function(e) {
    if(img.width>200||img.height>200){
    var prop=Math.min(200/img.width,200/img.height);
    img.width=img.width*prop;
    img.height=img.height*prop;
    }
    canvas1.width=img.width;
    canvas1.height=img.height;
    ctx.drawImage(img, 0, 0, img.width, img.height);
    S('#canvid1').html(S('#canvid1').html()+"<img src='"+canvas1.toDataURL("image/jpeg")+"'/>");
    var t = window.setTimeout(function() {
    var i=getCurImg(),target=canvas._prevTransform.target;
    console.log(target);
    canvas._aImages[i]=new canvasImg.Img(dom.query('#canvid1 img')[0], {
    top:target.top,
    left:target.left,
    scalex:target.scalex,
    scaley:target.scaley,
    angle:canvas.curAngle
    });
    canvas.renderTop();
    clearTimeout(t);
    S('#canvid1 img').remove();
    },1000);
    };
    img.src = dataURL;
    };
    })();
    reader.readAsDataURL(files[0]);
    });
    S('#upload_btn').on('click',function(){
    var imgData = canvas.canvasTo('jpeg');
    var imgValue = imgData.substr(22);
    S.ajax({
    url : 'http://localhost/html5/upload1.php',
    type : 'POST',
    data : {
    imgData : imgValue,
    file_name :'mix_img.jpeg'
    },
    dataType : 'text',
    success : function(data) {
    alert("s");
    }
    });
    });
    });

    至于用html5 input读取图片,这很简单就不贴出来了。

    希望本文所述对大家的HTML5程序设计有所帮助。

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