//代码框架
<div class="content-box">
<div id="demo1" class="scratchpad"></div>
<div id="demo1-percent"> </div>
<script type="text/javascript">
$('#demo1').wScratchPad({
size:25, //笔刷大小
fg: './images/canvas-image.png',//图片背景
bg: './images/openprize.png',//中奖图片
// realtime : true,
'cursor': 'crosshair',//刮奖橡皮图片
scratchDown: function(e, percent){
$(this.canvas).css('margin-right', $(this.canvas).css('margin-right') == "0px" ? "1px" : "0px");
},
scratchMove: function(e, percent){
$(this.canvas).css('margin-right', $(this.canvas).css('margin-right') == "0px" ? "1px" : "0px");
if (percent > 5) {
this.clear();
$('#infor-btn').addClass("infor-select");
setTimeout("xxx()",1000)
// $('#demo1-percent').html("<img src='images/area-open.png' />");
// $('#demo1-percent').css("background",'url(images/area.png) no-repeat scroll')
}
},
scratchUp: function(e, percent){
$(this.canvas).css('margin-right', $(this.canvas).css('margin-right') == "0px" ? "1px" : "0px");
}
});
function xxx(){
$('#demo1-percent').html("<img src='images/area-open.png' />");
}
</script>
</div>
.scratchpad {
height: 178px;
position: absolute;
right: 6px;
top: 110px;
width: 294px;
}
/*插件框架*/
/*! wScratchPad - v2.1.0 - 2014-04-14 */
!
function(a) {
"use strict";
function b(b, c) {
this.$el = a(b),
this.options = c,
this.init = !1,
this.enabled = !0,
this._generate()
}
b.prototype = {
_generate: function() {
return a.support.canvas ? (this.canvas = document.createElement("canvas"), this.ctx = this.canvas.getContext("2d"), "static" === this.$el.css("position") && this.$el.css("position", "relative"), this.$img = a('<img src=""/>').attr("crossOrigin", "").css({
position: "absolute",
width: "100%",
height: "100%"
}), this.$scratchpad = a(this.canvas).css({
position: "absolute",
width: "100%",
height: "100%"
}), this.$scratchpad.bindMobileEvents(), this.$scratchpad.mousedown(a.proxy(function(b) {
return this.enabled ? (this.canvasOffset = a(this.canvas).offset(), this.scratch = !0, void this._scratchFunc(b, "Down")) : !0
},
this)).mousemove(a.proxy(function(a) {
this.scratch && this._scratchFunc(a, "Move")
},
this)).mouseup(a.proxy(function(a) {
this.scratch && (this.scratch = !1, this._scratchFunc(a, "Up"))
},
this)), this._setOptions(), this.$el.append(this.$img).append(this.$scratchpad), this.init = !0, void this.reset()) : (this.$el.append("Canvas is not supported in this browser."), !0)
},
reset: function() {
var b = this,
c = Math.ceil(this.$el.innerWidth()),
d = Math.ceil(this.$el.innerHeight()),
e = window.devicePixelRatio || 1;
this.pixels = c * d,
this.$scratchpad.attr("width", c).attr("height", d),
this.canvas.setAttribute("width", c * e),
this.canvas.setAttribute("height", d * e),
this.ctx.scale(e, e),
this.pixels = c * e * d * e,
this.$img.hide(),
this.options.fg && ("#" === this.options.fg.charAt(0) ? (this.ctx.fillStyle = this.options.fg, this.ctx.beginPath(), this.ctx.rect(0, 0, c, d), this.ctx.fill(), this.$img.show()) : a(new Image).attr("src", this.options.fg).load(function() {
b.ctx.drawImage(this, 0, 0, c, d),
b.$img.show()
})),
//setTimeout(function(){
this.options.bg && ("#" === this.options.bg.charAt(0) ? this.$el.css("backgroundColor", this.options.bg) : (this.$el.css("backgroundColor", ""), this.$img.attr("src", this.options.bg)))//中奖图片
//}, 300)
},
clear: function() {
this.ctx.clearRect(0, 0, Math.ceil(this.$el.innerWidth()), Math.ceil(this.$el.innerHeight()))
},
enable: function(a) {
this.enabled = a === !0 ? !0: !1
},
destroy: function() {
this.$el.children().remove(),
a.removeData(this.$el, "wScratchPad")
},
_setOptions: function() {
var a,
b;
for (a in this.options) this.options[a] = this.$el.attr("data-" + a) || this.options[a],
b = "set" + a.charAt(0).toUpperCase() + a.substring(1),
this[b] && this[b](this.options[a])
},
setBg: function() {
this.init && this.reset()
},
setFg: function() {
this.setBg()
},
setCursor: function(a) {
this.$el.css("cursor", a)
},
_scratchFunc: function(a, b) {
a.pageX = Math.floor(a.pageX - this.canvasOffset.left),
a.pageY = Math.floor(a.pageY - this.canvasOffset.top),
this["_scratch" + b](a),
(this.options.realtime || "Up" === b) && this.options["scratch" + b] && this.options["scratch" + b].apply(this, [a, this._scratchPercent()])
},
_scratchPercent: function() {
for (var a = 0, b = this.ctx.getImageData(0, 0, this.canvas.width, this.canvas.height), c = 0, d = b.data.length; d > c; c += 4) 0 === b.data[c] && 0 === b.data[c + 1] && 0 === b.data[c + 2] && 0 === b.data[c + 3] && a++;
return a / this.pixels * 100
},
_scratchDown: function(a) {
this.ctx.globalCompositeOperation = "destination-out",
this.ctx.lineJoin = "round",
this.ctx.lineCap = "round",
this.ctx.strokeStyle = this.options.color,
this.ctx.lineWidth = this.options.size,
this.ctx.beginPath(),
this.ctx.arc(a.pageX, a.pageY, this.options.size / 2, 0, 2 * Math.PI, !0),
this.ctx.closePath(),
this.ctx.fill(),
this.ctx.beginPath(),
this.ctx.moveTo(a.pageX, a.pageY)
},
_scratchMove: function(a) {
this.ctx.lineTo(a.pageX, a.pageY),
this.ctx.stroke()
},
_scratchUp: function() {
this.ctx.closePath()
}
},
a.support.canvas = document.createElement("canvas").getContext,
a.fn.wScratchPad = function(c, d) {
function e() {
var d = a.data(this, "wScratchPad");
return d || (d = new b(this, a.extend(!0, {},
c)), a.data(this, "wScratchPad", d)),
d
}
if ("string" == typeof c) {
var f,
g = [],
h = (void 0 !== d ? "set": "get") + c.charAt(0).toUpperCase() + c.substring(1),
i = function() {
f.options[c] && (f.options[c] = d),
f[h] && f[h].apply(f, [d])
},
j = function() {
return f[h] ? f[h].apply(f, [d]) : f.options[c] ? f.options[c] : void 0
},
k = function() {
f = a.data(this, "wScratchPad"),
f && (f[c] ? f[c].apply(f, [d]) : void 0 !== d ? i() : g.push(j()))
};
return this.each(k),
g.length ? 1 === g.length ? g[0] : g: this
}
return c = a.extend({},
a.fn.wScratchPad.defaults, c),
this.each(e)
},
a.fn.wScratchPad.defaults = {
size: 5,
bg: "#cacaca",
fg: "#6699ff",
realtime: !0,
scratchDown: null,
scratchUp: null,
scratchMove: null,
cursor: "crosshair"
},
a.fn.bindMobileEvents = function() {
a(this).on("touchstart touchmove touchend touchcancel",
function(a) {
var b = a.changedTouches || a.originalEvent.targetTouches,
c = b[0],
d = "";
switch (a.type) {
case "touchstart":
d = "mousedown";
break;
case "touchmove":
d = "mousemove",
a.preventDefault();
break;
case "touchend":
d = "mouseup";
break;
default:
return
}
var e = document.createEvent("MouseEvent");
e.initMouseEvent(d, !0, !0, window, 1, c.screenX, c.screenY, c.clientX, c.clientY, !1, !1, !1, !1, 0, null),
c.target.dispatchEvent(e)
})
}
} (jQuery);
刮刮卡效果插件及用法~
