pinchzoom 官网 http://manuelstofer.github.io/pinchzoom/
PortraitClip.css
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.pinch-page{
position
:
fixed
;
top
:
0
;
bottom
:
0
;
left
:
0
;
right
:
0
;
display
:
none
;
width
:
100%
;
height
:
100%
;
background-color
:
#333
;
z-index
:
9
;
}
.pinch-page .top-mask,
.pinch-page .bottom-mask{
position
:
absolute
;
left
:
0
;
top
:
0
;
right
:
0
;
display
:
block
;
background-color
:rgba(
0
,
0
,
0
,
0.6
);
z-index
:
99
;
}
.pinch-page .bottom-mask{
top
:
auto
;
bottom
:
0
;
}
.pinch-page .pinch-zoom-container{
position
:
absolute
!important
;
left
:
0
;
top
:
0
;
bottom
:
0
;
right
:
0
;
margin
:
auto
;
overflow
:
visible
!important
;
z-index
:
9
;
box-sizing: border-box;
}
.pinch-page .pinch-zoom-container:before{
content
:
""
;
position
:
absolute
;
top
:
0
;
bottom
:
0
;
left
:
0
;
right
:
0
;
display
:
block
;
width
:
100%
;
height
:
100%
;
z-index
:
999
;
border
:
1px
solid
#fff
;
box-sizing: border-box;
}
.pinch-page .pinch-zoom{
}
.pinch-page .pinch-zoom-image{
display
:
block
;
width
:
100%
;
height
:
320px
;
background
:
no-repeat
center
center
;
background-
size
:contain;
}
.pinch-page .operation-bar{
position
:
absolute
;
left
:
0
;
right
:
0
;
bottom
:
0
;
display
:
block
;
height
:
60px
;
z-index
:
999
;
background-color
:rgba(
51
,
51
,
51
,
0.6
);
}
.pinch-page .operation-bar .cancel-btn{
position
:
absolute
;
top
:
0
;
bottom
:
0
;
left
:
0
;
display
:
block
;
height
:
60px
;
line-height
:
60px
;
font-size
:
16px
;
color
:
#fff
;
padding
:
0
20px
;
}
.pinch-page .operation-bar .save-btn{
position
:
absolute
;
top
:
0
;
bottom
:
0
;
right
:
0
;
display
:
block
;
height
:
60px
;
line-height
:
60px
;
font-size
:
16px
;
color
:
#fff
;
padding
:
0
20px
;
}
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PortraitClip.js
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(
function
($){
/* ======================================== 页面渲染 ======================================== */
/* ======================================== 不可变字段 ======================================== */
var
initialized =
false
;
// 是否初始化
var
container =
null
;
var
clientWidth = $(window).width();
var
clientHeight = $(window).height();
var
pinchZoomImageWidth = clientWidth;
var
pinchZoomImageHeight = clientWidth;
var
maskHeight = (clientHeight-clientWidth)/2;
var
pinchZoom =
null
;
// pinchZoom 对象
/* ======================================== 可变字段 ======================================== */
var
imageWidth = 0;
var
imageHeight = 0;
var
xOffset = 0;
var
yOffset = 0;
var
originScale = 0;
var
image =
null
;
var
callback =
null
;
// 加载完之后的回调
// 构建DOM
function
render(){
var
html =
"<div class='pinch-page'> "
+
" <em class='top-mask'></em> "
+
" <div class='pinch-zoom'> "
+
" <div class='pinch-zoom-image'></div> "
+
" </div> "
+
" <em class='bottom-mask'></em> "
+
" <div class='operation-bar'> "
+
" <a class='cancel-btn'>取消</a> "
+
" <a class='save-btn'>选取</a> "
+
" </div> "
+
"</div> "
;
$(html).appendTo(
"body"
);
// 初始化 pinchZoom
pinchZoom =
new
RTP.PinchZoom($(
".pinch-zoom"
));
// 添加遮罩
$(
".pinch-page .top-mask"
).css(
"height"
,maskHeight+
"px"
);
$(
".pinch-page .bottom-mask"
).css(
"height"
,maskHeight+
"px"
);
$(
".pinch-zoom-container,.pinch-zoom-image"
).css({
"width"
:pinchZoomImageWidth+
"px"
,
"height"
:pinchZoomImageHeight+
"px"
});
container = $(
".pinch-page"
);
}
// 绑定事件
function
bindPageEvents(){
container.on(
"touchend"
,
".save-btn"
,
function
(e){
e.stopPropagation();
e.preventDefault();
var
transformCss = $(
".pinch-zoom"
).css(
"-webkit-transform"
);
var
positionInfo = retrievePositionInfo(transformCss);
clipImage(positionInfo.scale,positionInfo.x,positionInfo.y,callback);
$(container).hide();
});
container.on(
"touchend"
,
".cancel-btn"
,
function
(e){
e.stopPropagation();
e.preventDefault();
$(container).hide();
});
container.on(
"touchstart touchmove touchend"
,
function
(e){
e.stopPropagation();
e.preventDefault();
});
}
// 初始化方法
function
init(){
if
(initialized){
return
;
}
initialized =
true
;
render();
bindPageEvents();
}
/* ======================================== common-method ======================================== */
// 刷新 头像剪裁容器
function
loadImage(originImage,loadCallback){
if
(!initialized){init();}
// 如果未初始化则初始化
callback = loadCallback;
$(container).find(
".pinch-zoom-image"
).css(
"background-image"
,
"url("
+originImage+
")"
);
image =
new
Image();
image.onload =
function
(){
imageWidth = image.width;
imageHeight = image.height;
loadImageCallback();
$(container).show();
};
image.src=originImage;
}
// 图像加载回调
function
loadImageCallback(){
if
(imageWidth>imageHeight){
yOffset = (imageWidth-imageHeight)*pinchZoomImageWidth/imageWidth/2;
originScale = pinchZoomImageWidth/imageWidth;
}
else
{
xOffset = (imageHeight-imageWidth)*pinchZoomImageWidth/imageHeight/2;
originScale = pinchZoomImageHeight/imageHeight;
}
var
minZoom = 1;
if
(xOffset!=0){
minZoom = clientWidth/(clientWidth-2*xOffset);
}
if
(yOffset!=0){
minZoom = clientWidth/(clientWidth-2*yOffset);
}
// 初始化 pinchZoom 对戏那个
pinchZoom.options.minZoom = minZoom;
pinchZoom.options.tapZoomFactor = minZoom;
pinchZoom.options.xOffset = xOffset;
pinchZoom.options.yOffset = yOffset;
var
event = {touches:[{pageX:pinchZoomImageWidth/2,pageY:clientHeight/2}]};
setTimeout(
function
(){pinchZoom.handleDoubleTap(event);},300);
}
// 剪裁图像
function
clipImage(scale,x,y,callback){
// 创建 canvas
var
canvasId =
"canvas_"
+
new
Date().getTime()+
""
+parseInt(Math.random()*10000);
$(
"<canvas></canvas>"
).hide().attr(
"id"
,canvasId).appendTo(
"body"
);
var
canvas=$(
"#"
+canvasId)[0];
var
ctx=canvas.getContext(
"2d"
);
// 释放canvas
function
releaseCanvas(){
$(
"#"
+canvasId).remove();
}
// canvas 宽度 高度
canvas.width = pinchZoomImageWidth;
canvas.height= pinchZoomImageHeight;
if
(image.width>image.height){
y=y-yOffset;
}
else
{
x=x-xOffset;
}
ctx.drawImage(image,x/originScale,y/originScale,pinchZoomImageWidth/scale/originScale,pinchZoomImageHeight/scale/originScale,0,0,pinchZoomImageWidth,pinchZoomImageHeight);
var
dataURL = canvas.toDataURL();
if
(callback!=
null
){
callback(dataURL);
}
releaseCanvas();
}
// 获取 pinch-zoom 缩放 偏移信息
function
retrievePositionInfo(transformCss){
var
infoStr = transformCss.replace(
"matrix("
,
""
);
infoStr = infoStr.replace(
")"
,
""
);
var
arr = infoStr.split(
","
);
var
scale = arr[0];
var
x = arr[4];
var
y = arr[5];
if
(x<0){
x = -1*x;
}
if
(y<0){
y=-1*y;
}
var
result = {scale:scale,x:x/scale,y:y/scale};
return
result;
}
var
PortraitClipUtil = {};
PortraitClipUtil.loadImage=loadImage;
window.PortraitClipUtil = PortraitClipUtil;
})(jQuery);
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测试页面
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<
html
>
<
head
>
<
title
>Pinchzoom.js Demo</
title
>
<
meta
charset
=
"UTF-8"
/>
<
meta
name
=
"viewport"
content
=
"width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no"
>
<
meta
name
=
"apple-mobile-web-app-capable"
content
=
"yes"
/>
<
link
rel
=
"stylesheet"
href
=
"css/common/PortraitClip.css"
/>
<
style
>
body{margin:0;}
</
style
>
</
head
>
<
body
style
=
"height:900px;"
>
<
button
id
=
"upload-image"
>上传图片</
button
>
<
image
id
=
"image"
style
=
"position: absolute;display:block;top:0;z-index:9999;"
/>
<
script
type
=
"text/javascript"
src
=
"dist/js/jquery-1.11.3.min.js"
></
script
>
<
script
type
=
"text/javascript"
src
=
"dist/js/pinchzoom-xiaomin.min.js"
></
script
>
<
script
type
=
"text/javascript"
src
=
"js/common/PortraitClip.js"
></
script
>
<
script
>
$("#upload-image").click(function(e){
PortraitClipUtil.loadImage("frog.jpg",function(dataURL){
$("#image").attr("src",dataURL);
});
});
</
script
>
</
body
>
</
html
>
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注:这边引入的是pinchzoom-xiaomin.min.js。对pinchzoom.min.js源代码有所变更。pinchzoom.js,pinchzoom.min.js,pinchzoom-xiaomin.js,pinchzoom-xiaomin.min.js在相应的附件中。
附件：http://down.51cto.com/data/2368108
本文转自 antlove 51CTO博客，原文链接:http://blog.51cto.com/antlove/1844000
