ASP.NET簡單實現APP中用戶我的頭像上傳和裁剪
最近有個微信項目的用戶我的中心模塊中，客戶要求用戶頭像不單單只是上傳圖片，還須要能對圖片進行裁剪。考慮到flash在IOS和Android上的兼容性問題，因而想着能從js這塊入手，在網上發現了devotion博主寫的《適應各瀏覽器圖片裁剪無刷新上傳js插件》文章，從中受到些許啓發，以此爲參考，進行了簡單的修改。javascript
新建一個頁面，代碼以下：css
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>圖片裁剪</title>
<meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport" />
<link href="../css/jquery.Jcrop.min.css" rel="stylesheet" />
<script type="text/javascript" src="../js/jquery-1.7.1.min.js"></script>
<script type="text/javascript" src="../js/jquery.Jcrop.min.js"></script>
<script type="text/javascript" src="../js/imageCropperUpload.js"></script>
<style type="text/css">
#test
{
width: 100%;
height: 100%;
background-color: #000;
position: absolute;
top: 0;
left: 0;
z-index: 2;
opacity: 0.8;
/*兼容IE8及如下版本瀏覽器*/
filter: alpha(opacity=60);
display: none;
}
#fileList
{
width: 100%;
height: 500px;
/*background-color: #FF0;*/
margin: auto;
position: absolute;
z-index: 3;
top: 0;
bottom: 0;
left: 0;
right: 0;
display: none;
text-align: center;
}
#divtest {
position: absolute;
z-index: 3;
display: none;
bottom: 10px;
left: 0;
width: 100%;
}
#divCancel
{
float: left;
width: 48px;
height: 32px;
line-height: 32px;
margin: 10px 20px;
background-color: #fff;
text-align: center;
cursor: pointer;
display: block;
}
#divConfirm
{
float: right;
width: 48px;
height: 32px;
line-height: 32px;
margin: 10px 20px;
background-color: #fff;
text-align: center;
cursor: pointer;
display: block;
}
</style>
<script type="text/javascript">
$(function () {
var btn = $("#selectFile");
btn.click(function () {
$("#test").show();
$("#fileList").show();
$("#divtest").show();
$("#divCancel").show();
$("#divConfirm").show();
});
$("#divCancel").click(function () {
$("#test").hide();
$("#fileList").hide();
$("#divtest").hide();
});
$("#divConfirm").click(function () {
$("#files").click();
});
btn.cropperUpload({
url: "../ajax/UploadPersonImage.ashx",//服務端處理圖片
fileSuffixs: ["jpg", "png", "bmp"],
errorText: "{0}",
onComplete: function (msg) {
$("#divCancel").hide();
$("#divConfirm").hide();
if (msg == "false") {
alert("上傳失敗！");
return;
}
$("#testimg").attr("src", msg);
},
cropperParam: {//Jcrop參數設置，除onChange和onSelect不要使用，其餘屬性均可用
maxSize: [500, 300], //不要小於50，如maxSize:[40,24]
minSize: [300, 150], //不要小於50，如minSize:[40,24]
bgColor: "black",
bgOpacity: .4,
allowResize: true,
allowSelect: true,
animationDelay: 50
},
perviewImageElementId: "fileList", //設置預覽圖片的元素id
perviewImgStyle: { width: '100%', height: '500px', border: '1px solid #ebebeb'}//設置預覽圖片的樣式
});
var upload = btn.data("uploadFileData");
$("#files").click(function () {
upload.submitUpload();
$("#test").hide();
$("#fileList").hide();
$("#divtest").hide();
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<!-- 文件上傳 start -->
<div style="width: 100%; float: left">
<input id="selectFile" type="button" value="選擇文件" />
<input id="files" type="button" value="上傳截圖" style="display: none;" />
</div>
<!-- 文件上傳 end -->
<!-- 圖片上傳後展現的地方 start -->
<div id="testdiv" style="margin-top: 10px; width: 100%;">
<img alt="" src="" id="testimg" />
</div>
<!-- 圖片上傳後展現的地方 end -->
<!-- 遮罩層 start -->
<div id="test"></div>
<div id="fileList">
</div>
<div id="divtest">
<div id="divCancel">取消</div>
<div id="divConfirm">肯定</div>
</div>
<!-- 遮罩層 end -->
</form>
</body>
</html>
頁面中jQuery.Jcrop.min.css和jquery.Jcrop.min.js是Jcrop插件必須的一個樣式表文件和js文件，jquery能夠自行下載，而後後面的imageCropperUpload.js文件是devotion博主寫的插件，我本身簡單的修改了一下，注意引用順序不要弄錯了，不然不起做用。html
(function ($) {
var defaultSettings = {
url: "uploadImg/", //上傳地址
fileSuffixs: ["jpg", "png"], //容許上傳的文件後綴名列表
errorText: "不能上傳後綴爲 {0} 的文件！", //錯誤提示文本，其中{0}將會被上傳文件的後綴名替換
onCheckUpload: function (text) { //上傳時檢查文件後綴名不包含在fileSuffixs屬性中時觸發的回調函數，(text爲錯誤提示文本)
},
onComplete: function (msg) { //上傳完成後的回調函數[無論成功或失敗，它都將被觸發](msg爲服務端的返回字符串)
alert(msg);
},
onChosen: function (file, obj, fileSize, errorTxt) { /*選擇文件後的回調函數，(file爲選中文件的本地路徑;obj爲當前的上傳控件實例,
fileSize爲上傳文件大小，單位KB[只有在isFileSize爲true時，此參數纔有值],
errorTxt爲獲取文件大小時的錯誤文本提示) */
//alert(file);
},
cropperParam: {}, //圖片截取參數設置，此參數即爲Jcrop插件參數
isFileSize: false,//是否獲取文件大小
perviewImageElementId: "",//用於預覽上傳圖片的元素id（請傳入一個div元素的id）
perviewImgStyle: null//用於設置圖片預覽時的樣式（可不設置，在不設置的狀況下多文件上傳時只能顯示一張圖片），如{ width: '100px', height: '100px', border: '1px solid #ebebeb' }
};
$.fn.cropperUpload = function (settings) {
settings = $.extend({}, defaultSettings, settings || {});
return this.each(function () {
var self = $(this);
var upload = new UploadAssist(settings);
upload.createIframe(this);
//綁定當前按鈕點擊事件
self.bind("click", function (e) {
upload.chooseFile();
});
//將上傳輔助類的實例，存放到當前對象中，方便外部獲取
self.data("uploadFileData", upload);
//建立的iframe中的那個iframe，它的事件須要延遲綁定
window.setTimeout(function () {
$(upload.getIframeContentDocument().body).find("input[type='file']").change(function () {
if (!this.value) return;
var fileSuf = this.value.substring(this.value.lastIndexOf(".") + 1);
//檢查是否爲容許上傳的文件
if (!upload.checkFileIsUpload(fileSuf, upload.settings.fileSuffixs)) {
upload.settings.onCheckUpload(upload.settings.errorText.replace("{0}", fileSuf));
return;
}
if (upload.settings.isFileSize) {
var size = perviewImage.getFileSize(this, upload.getIframeContentDocument());
var fileSize, errorTxt;
if (size == "error") {
errorTxt = upload.errorText;
} else {
fileSize = size;
}
//選中後的回調
upload.settings.onChosen(this.value, this, fileSize, errorTxt);
} else {
//選中後的回調
upload.settings.onChosen(this.value, this);
}
//是否開啓了圖片預覽
if (upload.settings.perviewImageElementId) {
var main = perviewImage.createPreviewElement("closeImg", this.value, upload.settings.perviewImgStyle);
$("#" + upload.settings.perviewImageElementId).append(main);
var div = $(main).children("div").get(0);
perviewImage.beginPerview(this, div, upload.getIframeContentDocument(), upload);
$("#fileList").children().children("div").css("height", "100%").css("border", "none");
}
});
//爲建立的iframe內部的iframe綁定load事件
$(upload.getIframeContentDocument().body.lastChild).on("load", function () {
var dcmt = upload.getInsideIframeContentDocument();
upload.submitStatus = true;
if (dcmt.body.innerHTML) {
if (settings.onComplete) {
settings.onComplete(dcmt.body.innerHTML);
}
dcmt.body.innerHTML = "";
}
});
}, 100);
});
};
})(jQuery);
//上傳輔助類
function UploadAssist(settings) {
//保存設置
this.settings = settings;
//建立的iframe惟一名稱
this.iframeName = "upload" + this.getTimestamp();
//提交狀態
this.submitStatus = true;
//針對IE上傳獲取文件大小時的錯誤提示文本
this.errorText = "請設置瀏覽器一些參數後再上傳文件，方法以下（設置一次便可）：\n請依次點擊瀏覽器菜單中的\n'工具->Internet選項->安全->可信站點->自定義級別'\n在彈出的自定義級別窗口中找到 'ActiveX控件和插件' 項，將下面的子項所有選爲 '啓用' 後，點擊肯定。\n此時不要關閉當前窗口，再點擊 '站點' 按鈕，在彈出的窗口中將下面複選框的 '√' 去掉，而後點擊 '添加' 按鈕並關閉當前窗口。\n最後一路 '肯定' 完成並刷新當前頁面。";
this.jcropApi;
return this;
}
UploadAssist.prototype = {
//輔助類構造器
constructor: UploadAssist,
//建立iframe
createIframe: function (/*插件中指定的dom對象*/elem) {
var html = "<html>"
+ "<head>"
+ "<title>upload</title>"
+ "<script>"
+ "function getDCMT(){return window.frames['dynamic_creation_upload_iframe'].document;}"
+ "</" + "script>"
+ "</head>"
+ "<body>"
+ "<form method='post' target='dynamic_creation_upload_iframe' enctype='multipart/form-data' action='" + this.settings.url + "'>"
+ "<input type='text' id='x1' name='x1' />"
+ "<input type='text' id='y1' name='y1' />"
+ "<input type='text' id='x2' name='x2' />"
+ "<input type='text' id='y2' name='y2' />"
+ "<input type='text' id='w' name='w' />"
+ "<input type='text' id='h' name='h' />"
+ "<input type='text' id='maxW' name='maxW' />"
+ "<input type='text' id='maxH' name='maxH' />"
+ "<input type='file' name='fileUpload' />"
+ "</form>"
+ "<iframe name='dynamic_creation_upload_iframe'></iframe>"
+ "</body>"
+ "</html>";
this.iframe = $("<iframe name='" + this.iframeName + "'></iframe>")[0];
this.iframe.style.width = "0px";
this.iframe.style.height = "0px";
this.iframe.style.border = "0px solid #fff";
this.iframe.style.margin = "0px";
elem.parentNode.insertBefore(this.iframe, elem);
var iframeDocument = this.getIframeContentDocument();
iframeDocument.write(html);
},
//獲取時間戳
getTimestamp: function () {
return (new Date()).valueOf();
},
//設置圖片縮放的最大高寬
setMaxWidthAndHeight: function (/*最大寬*/maxW,/*最大高*/maxH) {
this.getElement("maxW").value = maxW;
this.getElement("maxH").value = maxH;
},
//設置圖片截取參數
setImageCropperObj: function (/*圖片截取對象*/obj) {
this.getElement("x1").value = obj.x;
this.getElement("y1").value = obj.y;
this.getElement("x2").value = obj.x2;
this.getElement("y2").value = obj.y2;
this.getElement("w").value = obj.w;
this.getElement("h").value = obj.h;
},
//獲取建立的iframe中的元素
getElement: function (id) {
var dcmt = this.getIframeContentDocument();
return dcmt.getElementById(id);
},
//獲取建立的iframe中的document對象
getIframeContentDocument: function () {
return this.iframe.contentDocument || this.iframe.contentWindow.document;
},
//獲取建立的iframe所在的window對象
getIframeWindow: function () {
return this.iframe.contentWindow || this.iframe.contentDocument.parentWindow;
},
//獲取建立的iframe內部iframe的document對象
getInsideIframeContentDocument: function () {
return this.getIframeWindow().getDCMT();
},
//獲取上傳input控件
getUploadInput: function () {
var inputs = this.getIframeContentDocument().getElementsByTagName("input");
var uploadControl;
this.forEach(inputs, function () {
if (this.type === "file") {
uploadControl = this;
return false;
}
});
return uploadControl;
},
//forEach迭代函數
forEach: function (/*數組*/arr, /*代理函數*/fn) {
var len = arr.length;
for (var i = 0; i < len; i++) {
var tmp = arr[i];
if (fn.call(tmp, i, tmp) == false) {
break;
}
}
},
//提交上傳
submitUpload: function () {
if (!this.submitStatus) return;
this.submitStatus = false;
this.getIframeContentDocument().forms[0].submit();
},
//檢查文件是否能夠上傳
checkFileIsUpload: function (fileSuf, suffixs) {
var status = false;
this.forEach(suffixs, function (i, n) {
if (fileSuf.toLowerCase() === n.toLowerCase()) {
status = true;
return false;
}
});
return status;
},
//選擇上傳文件
chooseFile: function () {
if (this.settings.perviewImageElementId) {
$("#" + this.settings.perviewImageElementId).empty();
}
var uploadfile = this.getUploadInput();
$(uploadfile).val("").click();
}
};
//圖片預覽操做
var perviewImage = {
timers: [],
//獲取預覽元素
getElementObject: function (elem) {
if (elem.nodeType && elem.nodeType === 1) {
return elem;
} else {
return document.getElementById(elem);
}
},
//開始圖片預覽
beginPerview: function (/*文件上傳控件實例*/file, /*須要顯示的元素id或元素實例*/perviewElemId, /*上傳頁面所在的document對象*/ dcmt, /*上傳輔助類實例*/upload) {
this.imageOperation(file, perviewElemId, dcmt, upload);
},
//圖片預覽操做
imageOperation: function (/*文件上傳控件實例*/file, /*須要顯示的元素id或元素實例*/perviewElemId, /*上傳頁面所在的document對象*/ dcmt, /*上傳輔助類實例*/upload) {
for (var t = 0; t < this.timers.length; t++) {
window.clearInterval(this.timers[t]);
}
this.timers.length = 0;
var tmpParams = {
onChange: function (c) {
upload.setImageCropperObj(c);
},
onSelect: function (c) {
upload.setImageCropperObj(c);
}
};
var sWidth = 50, sHeight = 50;
if (upload.settings.cropperParam.minSize) {
var size = upload.settings.cropperParam.minSize;
sWidth = size[0] > sWidth ? size[0] : sWidth;
sHeight = size[1] > sHeight ? size[1] : sHeight;
}
var params = $.extend({}, tmpParams, upload.settings.cropperParam || {});
var preview_div = this.getElementObject(perviewElemId);
var MAXWIDTH = preview_div.clientWidth;
var MAXHEIGHT = preview_div.clientHeight;
upload.setMaxWidthAndHeight(MAXWIDTH, MAXHEIGHT);
if (file.files && file.files[0]) { //此處爲Firefox，Chrome以及IE10的操做
preview_div.innerHTML = "";
var img = document.createElement("img");
preview_div.appendChild(img);
img.style.visibility = "hidden";
img.onload = function () {
var rect = perviewImage.clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
img.style.width = rect.width + 'px';
img.style.height = rect.height + 'px';
img.style.visibility = "visible";
var offsetWidth = (rect.width / 2) - (sWidth / 2);
var offsetHeight = (rect.height / 2) - (sHeight / 2);
var obj = {
x: offsetWidth,
y: offsetHeight,
x2: offsetWidth + sWidth,
y2: offsetHeight + sHeight,
w: sWidth,
h: sHeight
};
$(img).Jcrop(params, function () {
upload.jcropApi = this;
this.animateTo([obj.x, obj.y, obj.x2, obj.y2]);
upload.setImageCropperObj(obj);
});
};
var reader = new FileReader();
reader.onload = function (evt) {
img.src = evt.target.result;
};
reader.readAsDataURL(file.files[0]);
} else { //此處爲IE6，7，8，9的操做
file.select();
var src = dcmt.selection.createRange().text;
var div_sFilter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod='scale',src='" + src + "')";
var img_sFilter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod='image',src='" + src + "')";
preview_div.innerHTML = "";
var img = document.createElement("div");
preview_div.appendChild(img);
img.style.filter = img_sFilter;
img.style.visibility = "hidden";
img.style.width = "100%";
img.style.height = "100%";
function setImageDisplay() {
var rect = perviewImage.clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
preview_div.innerHTML = "";
var div = document.createElement("div");
div.style.width = rect.width + 'px';
div.style.height = rect.height + 'px';
div.style.filter = div_sFilter;
var offsetWidth = (rect.width / 2) - (sWidth / 2);
var offsetHeight = (rect.height / 2) - (sHeight / 2);
var obj = {
x: offsetWidth,
y: offsetHeight,
x2: offsetWidth + sWidth,
y2: offsetHeight + sHeight,
w: sWidth,
h: sHeight
};
preview_div.appendChild(div);
$(div).Jcrop(params, function () {
upload.jcropApi = this;
this.animateTo([obj.x, obj.y, obj.x2, obj.y2]);
upload.setImageCropperObj(obj);
});
}
//圖片加載計數
var tally = 0;
var timer = window.setInterval(function () {
if (img.offsetHeight != MAXHEIGHT) {
window.clearInterval(timer);
setImageDisplay();
} else {
tally++;
}
//若是超過兩秒鐘圖片還不能加載，就中止當前的輪詢
if (tally > 20) {
window.clearInterval(timer);
setImageDisplay();
}
}, 100);
this.timers.push(timer);
}
},
//按比例縮放圖片
clacImgZoomParam: function (maxWidth, maxHeight, width, height) {
var param = { width: width, height: height };
if (width > maxWidth || height > maxHeight) {
var rateWidth = width / maxWidth;
var rateHeight = height / maxHeight;
if (rateWidth > rateHeight) {
param.width = maxWidth;
param.height = Math.round(height / rateWidth);
} else {
param.width = Math.round(width / rateHeight);
param.height = maxHeight;
}
}
param.left = Math.round((maxWidth - param.width) / 2);
param.top = Math.round((maxHeight - param.height) / 2);
return param;
},
//建立圖片預覽元素
createPreviewElement: function (/*關閉圖片名稱*/name, /*上傳時的文件名*/file, /*預覽時的樣式*/style) {
var img = document.createElement("div");
img.title = file;
img.style.overflow = "hidden";
for (var s in style) {
img.style[s] = style[s];
}
//var text = document.createElement("div");
//text.style.width = style.width;
//text.style.overflow = "hidden";
//text.style.textOverflow = "ellipsis";
//text.style.whiteSpace = "nowrap";
//text.innerHTML = file;
var main = document.createElement("div");
main.appendChild(img);
//main.appendChild(text);
return main;
},
//獲取上傳文件大小
getFileSize: function (/*上傳控件dom對象*/file, /*上傳控件所在的document對象*/dcmt) {
var fileSize;
if (file.files && file.files[0]) {
fileSize = file.files[0].size;
} else {
file.select();
var src = dcmt.selection.createRange().text;
try {
var fso = new ActiveXObject("Scripting.FileSystemObject");
var fileObj = fso.getFile(src);
fileSize = fileObj.size;
} catch (e) {
return "error";
}
}
fileSize = ((fileSize / 1024) + "").split(".")[0];
return fileSize;
}
};
而後新建一個通常預處理文件或者頁面，均可以。以上面的「UploadPersonImage.ashx」爲例，代碼以下：java
/// <summary>
/// UploadPersonImage 的摘要說明
/// </summary>
public class UploadPersonImage : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
var x = context.Request.Params["x1"]; //水平偏移量
var y = context.Request.Params["y1"]; //垂直偏移量
var x2 = context.Request.Params["x2"]; //水平偏移量 + 截取寬度
var y2 = context.Request.Params["y2"]; //垂直偏移量 + 截取高度
var w = context.Request.Params["w"]; //截取寬度
var h = context.Request.Params["h"]; //截取高度
var maxW = context.Request.Params["maxW"];//客戶端截取時，圖片的最大寬度
var maxH = context.Request.Params["maxH"];//客戶端截取時，圖片的最大高度
if (string.IsNullOrEmpty(x) || string.IsNullOrEmpty(y) || string.IsNullOrEmpty(w) || string.IsNullOrEmpty(h) || string.IsNullOrEmpty(maxW) || string.IsNullOrEmpty(maxH))
{
context.Response.Write("false");
return;
}
HttpFileCollection files = context.Request.Files;
if (files == null || files.Count <= 0)
{
context.Response.Write("false");
return;
}
// 服務器端存儲文件的文件夾（磁盤路徑）
string path = context.Server.MapPath("/");
const string imgpath = "WeixinPage/uploadImg"; //保存地址
if (Directory.Exists(path + imgpath) == false)
{
//若是不存在就建立file文件夾
Directory.CreateDirectory(path + imgpath);
}
var fileName = string.Empty;
for (var i = 0; i < files.Count; i++)
{
//首先將圖片縮放到與客戶端截取時的大小一致
using (var bitmap = GenerateThumbnail(int.Parse(maxW), int.Parse(maxH), files[i].InputStream))
{
fileName = "/" + DateTime.Now.Ticks + ".jpg";
var newFileName = path + imgpath + fileName;
try
{
//開始截取
ImageCropper(bitmap, int.Parse(w), int.Parse(h), int.Parse(x), int.Parse(y), newFileName,
System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (Exception ex)
{
context.Response.Write("false");
return;
}
}
}
//上傳成功，輸出圖片相對路徑
context.Response.Write("../uploadImg" + fileName);
//上傳失敗
context.Response.Flush();
}
/// <summary>
/// 生成指定大小的圖片
/// </summary>
/// <param name="maxWidth">生成圖片的最大寬度</param>
/// <param name="maxHeight">生成圖片的最大高度</param>
/// <param name="imgFileStream">圖片文件流對象</param>
private System.Drawing.Bitmap GenerateThumbnail(int maxWidth, int maxHeight, System.IO.Stream imgFileStream)
{
using (var img = System.Drawing.Image.FromStream(imgFileStream))
{
var sourceWidth = img.Width;
var sourceHeight = img.Height;
var thumbWidth = sourceWidth; //要生成的圖片的寬度
var thumbHeight = sourceHeight; //要生成圖片的的高度
//計算生成圖片的高度和寬度
if (sourceWidth > maxWidth || sourceHeight > maxHeight)
{
var rateWidth = (double)sourceWidth / maxWidth;
var rateHeight = (double)sourceHeight / maxHeight;
if (rateWidth > rateHeight)
{
thumbWidth = maxWidth;
thumbHeight = (int)Math.Round(sourceHeight / rateWidth);
}
else
{
thumbWidth = (int)Math.Round(sourceWidth / rateHeight);
thumbHeight = maxHeight;
}
}
var bmp = new System.Drawing.Bitmap(thumbWidth, thumbHeight);
//從Bitmap建立一個System.Drawing.Graphics對象，用來繪製高質量的縮小圖。
using (var gr = System.Drawing.Graphics.FromImage(bmp))
{
//設置 System.Drawing.Graphics對象的SmoothingMode屬性爲HighQuality
gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//下面這個也設成高質量
gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
//下面這個設成High
gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//把原始圖像繪製成上面所設置寬高的縮小圖
var rectDestination = new System.Drawing.Rectangle(0, 0, thumbWidth, thumbHeight);
gr.DrawImage(img, rectDestination, 0, 0, sourceWidth, sourceHeight,
System.Drawing.GraphicsUnit.Pixel);
return bmp;
}
}
}
/// <summary>
/// 截取圖片中的一部分
/// </summary>
/// <param name="img">待截取的圖片</param>
/// <param name="cropperWidth">截取圖片的寬</param>
/// <param name="cropperHeight">截取圖片的高</param>
/// <param name="offsetX">水平偏移量</param>
/// <param name="offsetY">垂直偏移量</param>
/// <param name="savePath">截取後的圖片保存位置</param>
/// <param name="imgFormat">截取後的圖片保存格式</param>
private void ImageCropper(System.Drawing.Image img, int cropperWidth, int cropperHeight, int offsetX,
int offsetY, string savePath,
System.Drawing.Imaging.ImageFormat imgFormat)
{
using (var bmp = new System.Drawing.Bitmap(cropperWidth, cropperHeight))
{
//從Bitmap建立一個System.Drawing.Graphics對象，用來繪製高質量的縮小圖。
using (var gr = System.Drawing.Graphics.FromImage(bmp))
{
//設置 System.Drawing.Graphics對象的SmoothingMode屬性爲HighQuality
gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//下面這個也設成高質量
gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
//下面這個設成High
gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//把原始圖像繪製成上面所設置寬高的截取圖
var rectDestination = new System.Drawing.Rectangle(offsetX, offsetY, cropperWidth, cropperHeight);
gr.DrawImage(img, 0, 0, rectDestination,
System.Drawing.GraphicsUnit.Pixel);
//保存截取的圖片
bmp.Save(savePath, imgFormat);
}
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
以上算是基本實現了，下面給出相應的效果圖。node
Jcrop插件的下載地址：http://code.ciaoca.com/jquery/jcrop/jquery
參考博客文章連接地址：http://blog.csdn.net/sq111433/article/details/17562703ajax
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