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); };
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 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 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 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) 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 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:
insert title here
删除 href='javascript:void(0)' id='photo_update'>更改图片
添加图片 type=file multiple= id='fileimage'> href='javascript:void(0)' id='upload_btn'>上传 点击图片可以旋转，拖拽,
缩放哦!
html5_puzzle.css代码如下：
复制代码
代码如下:
@charset utf-8;#html5_puzzle {
font-size: 0;
}
canvas {
background-color: transparent;
left: 0;
position: absolute;
top: 0;
}
.puzzle_column,#puzzle_left,#puzzle_right,#add_img {
display: inline-block;
}
.puzzle_column li {
display: block;
margin: 5px;
border: 1px solid #ffffff;
}
.puzzle_column li:hover {
border: 1px solid #3b5998;
cursor: pointer;
}
.puzzle_column {
font-size: 0;
}
#puzzle_left,#puzzle_right {
border: 1px solid #3b5998;
}
#puzzle_right,#puzzle_bottom a {
font-size: 14px;
margin: 10px 0 0 10px;
}
#puzzle_bottom {
margin: 5px 0;
}
#puzzle_canvas img {
}
#puzzle_canvas {
overflow: hidden;
width: 600px;
height: 450px;
position: relative;
}
#add_img input {
position: absolute;
font-size: 100px;
right: 0;
top: 0;
opacity: 0;
}
#add_img {
position: relative;
display: inline-block;
background: #3b5998;
border-radius: 4px;
padding: 4px 12px;
overflow: hidden;
color: #ffffff;
}
#bg,#show_list {
display: none;
}
#canvas_menu {
border: 1px solid red;
position: absolute;
z-index: 5;
top: 0;
left: 0;
display: none;
}
#canvas_menu a {
display: inline-block;
}
#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 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 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()+);
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。