pinchzoom 官网 http://manuelstofer.github.io/pinchzoom/
PortraitClip.css
.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-p_w_picpath{
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;
}
PortraitClip.js
(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 p_w_picpathWidth = 0;
var p_w_picpathHeight = 0;
var xOffset = 0;
var yOffset = 0;
var originScale = 0;
var p_w_picpath = null;
var callback = null; // 加载完之后的回调
// 构建DOM
function render(){
var html = " "+
" "+
" "+
" "+
"
"+
"
"+
" "+
" 取消 "+
" 选取 "+
" "+
"
";
$(html).appendTo("body");
// 初始化 pinchZoom
pinchZoom = new RTP.PinchZoom($(".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-p_w_picpath").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-p_w_picpath").css("background-p_w_picpath","url("+originImage+")");
p_w_picpath = new Image();
p_w_picpath.onload = function(){
p_w_picpathWidth = p_w_picpath.width;
p_w_picpathHeight = p_w_picpath.height;
loadImageCallback();
$(container).show();
};
p_w_picpath.src=originImage;
}
// 图像加载回调
function loadImageCallback(){
if(p_w_picpathWidth>p_w_picpathHeight){
yOffset = (p_w_picpathWidth-p_w_picpathHeight)*pinchZoomImageWidth/p_w_picpathWidth/2;
originScale = pinchZoomImageWidth/p_w_picpathWidth;
}else{
xOffset = (p_w_picpathHeight-p_w_picpathWidth)*pinchZoomImageWidth/p_w_picpathHeight/2;
originScale = pinchZoomImageHeight/p_w_picpathHeight;
}
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);
$("
").hide().attr("id",canvasId).appendTo("body");
var canvas=$("#"+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(p_w_picpath.width>p_w_picpath.height){
y=y-yOffset;
}else{
x=x-xOffset;
}
ctx.drawImage(p_w_picpath,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);
测试页面
Pinchzoom.js Demo
上传图片
