Canvas实现微信大转盘抽奖代码

Canvas实现微信大转盘抽奖代码，canvas结合jquery实现的一款大转盘抽奖代码，奖品图片均由canvas绘制，可自定义奖项。 jquery抽奖微信大转盘jquery抽奖转盘微信抽奖源代码微信抽奖功能canvas抽奖
可以查看演示拔下来
http://www.ui3g.com/code/uicode-1408.html

标签： JavaScript Localisation

代码片段(2)[全屏查看所有代码]

1. [代码][JavaScript]代码

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(function($) {

var supportedCSS,styles=document.getElementsByTagName("head")[0].style,toCheck="transformProperty WebkitTransform OTransform msTransform MozTransform".split(" ");

for (var a=0;a<toCheck.length;a++) if (styles[toCheck[a]] !== undefined) supportedCSS = toCheck[a];

// Bad eval to preven google closure to remove it from code o_O

// After compresion replace it back to var IE = 'v' == '\v'

var IE = eval('"v"=="\v"');

jQuery.fn.extend({

rotate:function(parameters)

{

if (this.length===0||typeof parameters=="undefined") return;

if (typeof parameters=="number") parameters={angle:parameters};

var returned=[];

for (var i=0,i0=this.length;i<i0;i++)

{

var element=this.get(i);

if (!element.Wilq32 || !element.Wilq32.PhotoEffect) {

var paramClone = $.extend(true, {}, parameters);

var newRotObject = new Wilq32.PhotoEffect(element,paramClone)._rootObj;

returned.push($(newRotObject));

}

else {

element.Wilq32.PhotoEffect._handleRotation(parameters);

}

return returned;

},

getRotateAngle: function(){

var ret = [];

for (var i=0,i0=this.length;i<i0;i++)

{

var element=this.get(i);

if (element.Wilq32 && element.Wilq32.PhotoEffect) {

ret[i] = element.Wilq32.PhotoEffect._angle;

}

return ret;

},

stopRotate: function(){

for (var i=0,i0=this.length;i<i0;i++)

{

var element=this.get(i);

if (element.Wilq32 && element.Wilq32.PhotoEffect) {

clearTimeout(element.Wilq32.PhotoEffect._timer);

}

});

// Library agnostic interface

Wilq32=window.Wilq32||{};

Wilq32.PhotoEffect=(function(){

if (supportedCSS) {

return function(img,parameters){

img.Wilq32 = {

PhotoEffect: this

};

this._img = this._rootObj = this._eventObj = img;

this._handleRotation(parameters);

}

} else {

return function(img,parameters) {

// Make sure that class and id are also copied - just in case you would like to refeer to an newly created object

this._img = img;

this._rootObj=document.createElement('span');

this._rootObj.style.display="inline-block";

this._rootObj.Wilq32 =

{

PhotoEffect: this

};

img.parentNode.insertBefore(this._rootObj,img);

if (img.complete) {

this._Loader(parameters);

} else {

var self=this;

// TODO: Remove jQuery dependency

jQuery(this._img).bind("load", function()

{

self._Loader(parameters);

});

}

})();

Wilq32.PhotoEffect.prototype={

_setupParameters : function (parameters){

this._parameters = this._parameters || {};

if (typeof this._angle !== "number") this._angle = 0 ;

if (typeof parameters.angle==="number") this._angle = parameters.angle;

this._parameters.animateTo = (typeof parameters.animateTo==="number") ? (parameters.animateTo) : (this._angle);

this._parameters.step = parameters.step || this._parameters.step || null;

this._parameters.easing = parameters.easing || this._parameters.easing || function (x, t, b, c, d) { return -c * ((t=t/d-1)*t*t*t - 1) + b; }

this._parameters.duration = parameters.duration || this._parameters.duration || 1000;

this._parameters.callback = parameters.callback || this._parameters.callback || function(){};

if (parameters.bind && parameters.bind != this._parameters.bind) this._BindEvents(parameters.bind);

},

_handleRotation : function(parameters){

this._setupParameters(parameters);

if (this._angle==this._parameters.animateTo) {

this._rotate(this._angle);

}

else {

this._animateStart();

}

},

_BindEvents:function(events){

if (events && this._eventObj)

{

// Unbinding previous Events

if (this._parameters.bind){

var oldEvents = this._parameters.bind;

for (var a in oldEvents) if (oldEvents.hasOwnProperty(a))

// TODO: Remove jQuery dependency

jQuery(this._eventObj).unbind(a,oldEvents[a]);

}

this._parameters.bind = events;

for (var a in events) if (events.hasOwnProperty(a))

// TODO: Remove jQuery dependency

jQuery(this._eventObj).bind(a,events[a]);

}

},

_Loader:(function()

{

if (IE)

return function(parameters)

{

var width=this._img.width;

var height=this._img.height;

this._img.parentNode.removeChild(this._img);

this._vimage = this.createVMLNode('image');

this._vimage.src=this._img.src;

this._vimage.style.height=height+"px";

this._vimage.style.width=width+"px";

this._vimage.style.position="absolute"; // FIXES IE PROBLEM - its only rendered if its on absolute position!

this._vimage.style.top = "0px";

this._vimage.style.left = "0px";

/* Group minifying a small 1px precision problem when rotating object */

this._container = this.createVMLNode('group');

this._container.style.width=width;

this._container.style.height=height;

this._container.style.position="absolute";

this._container.setAttribute('coordsize',width-1+','+(height-1)); // This -1, -1 trying to fix ugly problem with small displacement on IE

this._container.appendChild(this._vimage);

this._rootObj.appendChild(this._container);

this._rootObj.style.position="relative"; // FIXES IE PROBLEM

this._rootObj.style.width=width+"px";

this._rootObj.style.height=height+"px";

this._rootObj.setAttribute('id',this._img.getAttribute('id'));

this._rootObj.className=this._img.className;

this._eventObj = this._rootObj;

this._handleRotation(parameters);

}

else

return function (parameters)

{

this._rootObj.setAttribute('id',this._img.getAttribute('id'));

this._rootObj.className=this._img.className;

this._width=this._img.width;

this._height=this._img.height;

this._widthHalf=this._width/2; // used for optimisation

this._heightHalf=this._height/2;// used for optimisation

var _widthMax=Math.sqrt((this._height)*(this._height) + (this._width) * (this._width));

this._widthAdd = _widthMax - this._width;

this._heightAdd = _widthMax - this._height; // widthMax because maxWidth=maxHeight

this._widthAddHalf=this._widthAdd/2; // used for optimisation

this._heightAddHalf=this._heightAdd/2;// used for optimisation

this._img.parentNode.removeChild(this._img);

this._aspectW = ((parseInt(this._img.style.width,10)) || this._width)/this._img.width;

this._aspectH = ((parseInt(this._img.style.height,10)) || this._height)/this._img.height;

this._canvas=document.createElement('canvas');

this._canvas.setAttribute('width',this._width);

this._canvas.style.position="relative";

this._canvas.style.left = -this._widthAddHalf + "px";

this._canvas.style.top = -this._heightAddHalf + "px";

this._canvas.Wilq32 = this._rootObj.Wilq32;

this._rootObj.appendChild(this._canvas);

this._rootObj.style.width=this._width+"px";

this._rootObj.style.height=this._height+"px";

this._eventObj = this._canvas;

this._cnv=this._canvas.getContext('2d');

this._handleRotation(parameters);

}

})(),

_animateStart:function()

{

if (this._timer) {

clearTimeout(this._timer);

}

this._animateStartTime = +new Date;

this._animateStartAngle = this._angle;

this._animate();

},

_animate:function()

{

var actualTime = +new Date;

var checkEnd = actualTime - this._animateStartTime > this._parameters.duration;

// TODO: Bug for animatedGif for static rotation ? (to test)

if (checkEnd && !this._parameters.animatedGif)

{

clearTimeout(this._timer);

}

else

{

if (this._canvas||this._vimage||this._img) {

var angle = this._parameters.easing(0, actualTime - this._animateStartTime, this._animateStartAngle, this._parameters.animateTo - this._animateStartAngle, this._parameters.duration);

this._rotate((~~(angle*10))/10);

}

if (this._parameters.step) {

this._parameters.step(this._angle);

}

var self = this;

this._timer = setTimeout(function()

{

self._animate.call(self);

}, 10);

}

// To fix Bug that prevents using recursive function in callback I moved this function to back

if (this._parameters.callback && checkEnd){

this._angle = this._parameters.animateTo;

this._rotate(this._angle);

this._parameters.callback.call(this._rootObj);

}

},

_rotate : (function()

{

var rad = Math.PI/180;

if (IE)

return function(angle)

{

this._angle = angle;

this._container.style.rotation=(angle%360)+"deg";

}

else if (supportedCSS)

return function(angle){

this._angle = angle;

this._img.style[supportedCSS]="rotate("+(angle%360)+"deg)";

}

else

return function(angle)

{

this._angle = angle;

angle=(angle%360)* rad;

// clear canvas

this._canvas.width = this._width+this._widthAdd;

this._canvas.height = this._height+this._heightAdd;

// REMEMBER: all drawings are read from backwards.. so first function is translate, then rotate, then translate, translate..

this._cnv.translate(this._widthAddHalf,this._heightAddHalf); // at least center image on screen

this._cnv.translate(this._widthHalf,this._heightHalf); // we move image back to its orginal

this._cnv.rotate(angle); // rotate image

this._cnv.translate(-this._widthHalf,-this._heightHalf); // move image to its center, so we can rotate around its center

this._cnv.scale(this._aspectW,this._aspectH); // SCALE - if needed ;)

this._cnv.drawImage(this._img, 0, 0); // First - we draw image

}

})()

}

if (IE)

{

Wilq32.PhotoEffect.prototype.createVMLNode=(function(){

document.createStyleSheet().addRule(".rvml", "behavior:url(#default#VML)");

try {

!document.namespaces.rvml && document.namespaces.add("rvml", "urn:schemas-microsoft-com:vml");

return function (tagName) {

return document.createElement('<rvml:' + tagName + ' class="rvml">');

};

} catch (e) {

return function (tagName) {

return document.createElement('<' + tagName + ' xmlns="urn:schemas-microsoft.com:vml" class="rvml">');

};

}

})();

}

})(jQuery);