jquery image capture tool jquery.imagecropper.js

In addition to jquery, this plug-in also references UI libraries, including ui.draggable.js
ImageCropper demonstration requires asp.net support. Test passed
ImageCropper downloadhttp://www.jb51.net/jiaoben/25688.html
Plug-in usage:

Copy Code The code is as follows:

var imageCropper = $('#imgBackground').imageCropper();

It should be noted that This plug-in only applies to img tags with src attributes.
Through the parameters output by the plug-in, the image can be intercepted through the server-side code, for example:

Copy the code The code is as follows:

$('#imgCroppedImage').attr('src', 'CropImage.ashx?p=' imageCropper.settings.imagePath '&z=' imageCropper.settings.zoomLevel '&t=' imageCropper. settings.top '&l=' imageCropper.settings.left '&w=' imageCropper.settings.width '&h=' imageCropper.settings.height '&' Math.random()); 

asp.net hander CropImage.ashx:

Copy code The code is as follows:

 
public class CropImage : IHttpHandler 
{ 
public void ProcessRequest(HttpContext context) 
{ 
string imgPath = Convert.ToString(context.Request["p"]); 
float zoomLevel = Convert.ToSingle(context.Request["z"]); 
int top = Convert.ToInt32(context.Request["t"]); 
int left = Convert.ToInt32(context.Request["l "]); 
int width = Convert.ToInt32(context.Request["w"]); 
int height = Convert.ToInt32(context.Request["h"]); 
context.Response .ContentType = "image/jpeg"; 
Crop(HttpContext.Current.Server.MapPath(imgPath), zoomLevel, top, left, width, height).WriteTo(context.Response.OutputStream); 
} 
public MemoryStream Crop(string imgPath, float zoomLevel, int top, int left, int width, int height) 
{ 
Image img = Image.FromFile(imgPath); 
Bitmap bitmap = new Bitmap( width, height); 
Graphics g = Graphics.FromImage(bitmap); 
g.DrawImage(img, new Rectangle(0, 0, width, height), new Rectangle((int)(left / zoomLevel) , (int)(top / zoomLevel), (int)(width / zoomLevel), (int)(height / zoomLevel)), GraphicsUnit.Pixel); 
MemoryStream ms = new MemoryStream(); 
bitmap. Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); 
img.Dispose(); 
g.Dispose(); 
bitmap.Dispose(); 
return ms; 
} 
public bool IsReusable 
{ 
get 
{ 
return false; 
} 
} 
} 

The focus is on plugins , because the source code comments are relatively complete, the code is directly posted here:

Copy the code The code is as follows:

/**
* Copyright (c) 2010 Viewercq (http://www.cnblogs.com/viewercq/archive/2010/04/04/1704093.html)
* Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
* and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
*
* Version: 1.0
*
* Demo: https://dl.dropbox.com/u/4390741/ImageCropper.htm
*/
; (function($) {
$.fn.extend({
imageCropper: function(options) {
if (!this.is('img') || typeof this.attr('src') == 'undefined' || this.attr('src') == '') {
throw 'Please notice that this jquery plguin only could be applied to img and the src of img could not be null!';
}
var defaults = {
//原图路径
imagePath: this.attr('src'),
//缩放级别
zoomLevel: 1,
//图片相对于截取框是否居中
center: false,
//截取框与图片的相对位置
left: 0, top: 0,
//截取框的大小
width: 200, height: 200,
//工作区大小
cropWorkAreaSize: { width: 600, height: 400 },
//截取框相对于工作区的位置
cropFrameRect: { center: true, top: 0, left: 0 },
//缩放范围
zoom: { min: 0, max: 2, step: 0.01 },
//回调函数
callbacks: {
//移动图片后
dragging: false,
//缩放后
zoomed: false
}
};
if (options) {
defaults = $.extend(defaults, options);
}
return new imageCropper(this, defaults);
}
});
function imageCropper(image, settings) {
this.init(image, settings);
};
imageCropper.prototype = {
settings: false,
wrapper: $('

'),
zoomWrapper: $('

'),
img: false,
init: function(image, settings) {
var context = this;
this.settings = settings;
image.addClass('background-img');
//生成html
image.wrap(this.wrapper).wrap('

').wrap('

');
this.wrapper = $('.image-cropper-wrapper');
$('.crop-work-area', this.wrapper).append('

');
this.wrapper.append(this.zoomWrapper);
$('.image-cropper-wrapper', this.wrapper).disableSelection();
this.reset();
//图片的拖动
$('.crop-background', this.wrapper).draggable({
containment: $('.drag-containment', this.wrapper),
cursor: 'move',
drag: function(event, ui) {
var self = $(this).data('draggable');
//同时移动前景图
$('.foreground-img', this.wrapper).css({
left: (parseInt(self.position.left) - context.settings.cropFrameRect.left - 1) 'px',
top: (parseInt(self.position.top) - context.settings.cropFrameRect.top - 1) 'px'
});
//得到截图左上点坐标
context.settings.left = context.settings.cropFrameRect.left - parseInt($(this).css('left'));
context.settings.top = context.settings.cropFrameRect.top - parseInt($(this).css('top'));
//移动图片的callback
context.fireCallback(context.settings.callbacks.dragging);
}
});
$('.foreground-img', this.wrapper).draggable({
containment: $('.drag-containment', this.wrapper),
cursor: 'move',
drag: function(event, ui) {
var self = $(this).data('draggable');
//同时移动背景
$('.crop-background', this.wrapper).css({
left: (parseInt(self.position.left) context.settings.cropFrameRect.left 1) 'px',
top: (parseInt(self.position.top) context.settings.cropFrameRect.top 1) 'px'
});
//得到截图左上点坐标
context.settings.left = context.settings.cropFrameRect.left - parseInt($('.crop-background', this.wrapper).css('left'));
context.settings.top = context.settings.cropFrameRect.top - parseInt($('.crop-background', this.wrapper).css('top'));
//移动图片的callback
context.fireCallback(context.settings.callbacks.dragging);
}
});
//点击缩放
$('.zoom-out-button,.zoom-in-button', this.wrapper).click(function() {
var step = $(this).hasClass('zoom-in-button') ? context.settings.zoom.step : -context.settings.zoom.step;
var tempZoomLevel = context.formatNumber(context.settings.zoomLevel step, 3);
//如果缩放级别超出范围或者缩放导致图片右下角没在截取框内则取消缩放
if (context.settings.zoomLevel >= context.settings.zoom.min
&& context.settings.zoomLevel <= context.settings.zoom.max
&& parseInt($('.crop-background', this.wrapper).css('left')) tempZoomLevel * context.img.width > context.settings.cropFrameRect.left context.settings.width
&& parseInt($('.crop-background', this.wrapper).css('top')) tempZoomLevel * context.img.height > context.settings.cropFrameRect.top context.settings.height
) {
context.settings.zoomLevel = tempZoomLevel;
context.zoom(context.img.width * context.settings.zoomLevel, context.img.height * context.settings.zoomLevel);
$('.zoom-scroller', this.wrapper).css('left', context.settings.zoomLevel * 200 / (context.settings.zoom.max - context.settings.zoom.min) 'px');
}
context.fireCallback(context.settings.callbacks.zoomed);
});
//滚动条缩放
var cancelZoomScroll = false;
$('.zoom-scroller', this.wrapper).draggable({
containment: $('.zoom-scrollbar', this.wrapper),
axis: 'x',
drag: function(event, ui) {
var tempZoomLevel = (context.settings.zoom.max - context.settings.zoom.min) * parseInt($(this).css('left')) / 200;
//如果缩放级别超出范围或者缩放导致图片右下角没在截取框内则取消缩放
if (parseInt($('.crop-background', this.wrapper).css('left')) tempZoomLevel * context.img.width > context.settings.cropFrameRect.left context.settings.width
&& parseInt($('.crop-background', this.wrapper).css('top')) tempZoomLevel * context.img.height > context.settings.cropFrameRect.top context.settings.height
) {
context.settings.zoomLevel = tempZoomLevel;
context.zoom(context.img.width * context.settings.zoomLevel, context.img.height * context.settings.zoomLevel);
cancelZoomScroll = false;
context.fireCallback(context.settings.callbacks.zoomed);
}
else {
cancelZoomScroll = true;
}
},
stop: function(event, ui) {
//如果缩放级别无效则重置滚动条的值
if (cancelZoomScroll) {
$('.zoom-scroller', this.wrapper).css('left', context.settings.zoomLevel * 200 / (context.settings.zoom.max - context.settings.zoom.min) 'px');
}
}
});
},
reset: function() {
this.img = new Image();
this.img.src = this.settings.imagePath;
//截取框大于工作区，则放大工作区
var tempSize = {
width: Math.max(this.settings.cropWorkAreaSize.width, this.settings.width),
height: Math.max(this.settings.cropWorkAreaSize.height, this.settings.height)
};
//If the capture frame is centered in the workspace, reset the position of the capture frame
if (this.settings.cropFrameRect.center) {
this.settings.cropFrameRect.left = (tempSize. width - this.settings.width) / 2;
this.settings.cropFrameRect.top = (tempSize.height - this.settings.height) / 2;
}
//If the capture frame is in the image If (this.settings.center) {
this.settings.left = (this.img.width * this.settings.zoomLevel - this.settings .width) / 2;
this.settings.top = (this.img.height * this.settings.zoomLevel - this.settings.height) / 2;
}
this.wrapper.width( tempSize.width 2).height(tempSize.height 25);
$('.foreground-img,.background-img', this.wrapper).attr('src', this.settings.imagePath);
$('.crop-work-area', this.wrapper).width(tempSize.width).height(tempSize.height);
$('.crop-frame', this.wrapper).css ({
left: this.settings.cropFrameRect.left 'px',
top: this.settings.cropFrameRect.top 'px',
width: this.settings.width 'px',
height: this.settings.height 'px'
});
$('.foreground-img', this.wrapper).css({
left: (-this.settings.cropFrameRect. left - 1) 'px',
top: (-this.settings.cropFrameRect.top - 1) 'px'
});
$('.zoom-scroller', this.wrapper) .css('left', this.settings.zoomLevel * 200 / (this.settings.zoom.max - this.settings.zoom.min) 'px');
$('.crop-background', this .wrapper).css({
opacity: 0.3,
left: this.settings.cropFrameRect.left - this.settings.left 'px',
top: this.settings.cropFrameRect.top - this .settings.top 'px'
});
$('.foreground-img', this.wrapper).css({
left: -this.settings.left 'px',
top: -this.settings.top 'px'
});
this.settings.left = this.settings.cropFrameRect.left - parseInt($('.crop-background', this.wrapper) .css('left'));
this.settings.top = this.settings.cropFrameRect.top - parseInt($('.crop-background', this.wrapper).css('top'));
this.zoom(this.img.width * this.settings.zoomLevel, this.img.height * this.settings.zoomLevel);
},
zoom: function(width, height) {
$('.crop-background, .background-img, .foreground-img', this.wrapper).width(width).height(height);
//Adjust the drag limit box
$ ('.drag-containment', this.wrapper).css({
left: this.settings.cropFrameRect.left this.settings.width - this.settings.zoomLevel * this.img.width 1 'px',
top: this.settings.cropFrameRect.top this.settings.height - this.settings.zoomLevel * this.img.height 1 'px',
width: 2 * this.settings.zoomLevel * this.img .width - this.settings.width 'px',
height: 2 * this.settings.zoomLevel * this.img.height - this.settings.height 'px'
});
},
formatNumber: function(number, bit) {
return Math.round(number * Math.pow(10, bit)) / Math.pow(10, bit);
},
fireCallback : function(fn) {
if ($.isFunction(fn)) {
fn.call(this);
};
}
};
})(jQuery );

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