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网页裁剪图片(FileAPI)

2024-07-16 14:33:24   225人阅读

网页端裁剪图片(FileAPI)，兼容谷歌火狐IE6/7/8。
高版本浏览器用canvas 裁剪，低版本用flash过度。
FileAPI 的应用实例。

效果

 
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var ImgCropUtil = function(config) {
 
    var imgos = config.imgos;
    var cropMain = config.cropMain;
    var imgPreviewWidth = config.imgPreviewWidth;
    var ratio = 0;
 
    function getRatio(imgorigin, imgafter) {
        return imgafter.width / imgafter.height > imgorigin.width / imgorigin.height ? imgafter.height / imgorigin.height : imgafter.width / imgorigin.width;
    }
 
    function getWrapPaddings(image, imagewrapper) {
        return {
            ‘padding-top‘: (imagewrapper.height - image.matrix.dh) / 2,
            ‘padding-left‘: (imagewrapper.width - image.matrix.dw) / 2
        };
    }
 
    function getWrapPaddingsFull(image, imagewrapper) {
        return {
            ‘padding-top‘: (imagewrapper.height - image.matrix.dh) / 2,
            ‘padding-bottom‘: (imagewrapper.height - image.matrix.dh) / 2,
            ‘padding-left‘: (imagewrapper.width - image.matrix.dw) / 2,
            ‘padding-right‘: (imagewrapper.width - image.matrix.dw) / 2
        };
    }
 
    /**
     * 使用jcrop裁剪
     * @param {type} file
     * @param {type} $imgwrap 要建材的包裹img对象
     * @param {type} callback 回调 @param domimg , jcrop c object , image.matrix
     * @returns {undefined}
     */
    function getCropArea(file, $imgwrap, callback) {
        FileAPI.getInfo(file, function(err, info) {
            var image = FileAPI.Image(file);
            ratio = getRatio(info, imgos);
            image.matrix.dw = info.width * ratio;
            image.matrix.dh = info.height * ratio;
            cropMain.css(getWrapPaddingsFull(image, imgos));
 
            image.get(function(error, img1) {
                if (error) {
                    alert("图片读取出错！");
                    // return;
                }
 
                $imgwrap.empty();
                $(‘<div />‘).appendTo($imgwrap)
                        .html($(img1))
                        .Jcrop({
                            onSelect: function(c) {
                                image.matrix.sx = c.x / ratio;
                                image.matrix.sy = c.y / ratio;
                                image.matrix.sw = c.w / ratio;
                                image.matrix.sh = c.h / ratio;
                                var r = c.h / c.w;
                                image.matrix.dw = imgPreviewWidth;
                                image.matrix.dh = imgPreviewWidth * r;
                                image.get(function(error, domimg) {
                                    //  $(‘<div class="padding-top-10"></div>‘).appendTo(imageLists).html($(domimg));
                                    callback.call(domimg, c, image.matrix);
                                    file.cropMatrix = $.extend(true, {}, image.matrix);
                                    file.cropMatrix.dw = 0;
                                    file.cropMatrix.dh = 0;
                                });
 
                            }
                        });//end jcrop
            }); //end get
 
        });  //end getInfo
    }
 
    /**
     * 生成居中的图像
     * @param {FileAPI.image} fileapi的 file 对象
     * @param  {width: *, height: *} 要生成的宽和高
     * @param {function} callback回调 @param $imgobj
     * @returns {undefined}  异步方法，不返回值
     */
    function getCenterImage(file, imgtoList, callback) {
        var $imagewrap;
        FileAPI.getInfo(file, function(err, info) {
 
            var r = getRatio(info, imgtoList);
            var img = FileAPI.Image(file);
 
            img.matrix.dw = info.width * r;
            img.matrix.dh = info.height * r;
 
            img.get(function(error, domimg) {
                if (error) {
                    alert("图片读取出错！");
                    return;
                }
                // $imagewrap = $(‘<div />‘).css( getWrapPaddingsFull(img,imgtoList)).append($(domimg));
                $imagewrap = $(‘<div />‘).append($(domimg).css({
                    ‘width‘: img.matrix.dw,
                    ‘height‘: img.matrix.dh,
                    ‘display‘: ‘block‘
                })).css(getWrapPaddingsFull(img, imgtoList));
                callback($imagewrap);
            });
 
        });
    }
    /**
     * 生成居中的img图像 ,注意设置传入img的matrix对象 sw和sh值
     * @param {FileAPI.image} fileapi的image对象
     * @param  {width: *, height: *} 要生成的宽和高
     * @param {function} callback回调 @param $imgobj
     * @returns {undefined} 异步方法，不返回值
     */
    function getCenterCropImage(img, imgtoList, callback) {
        var $imagewrap;
        var info = {width: img.matrix.sw, height: img.matrix.sh};
        var r = getRatio(info, imgtoList);
        //var img = FileAPI.Image(file);
 
        img.matrix.dw = info.width * r;
        img.matrix.dh = info.height * r;
 
        img.get(function(error, domimg) {
            if (error) {
                alert("图片读取出错！");
                return;
            }
            // $imagewrap = $(‘<div />‘).css( getWrapPaddingsFull(img,imgtoList)).append($(domimg));
            $imagewrap = $(‘<div />‘).append($(domimg).css({
                ‘width‘: img.matrix.dw,
                ‘height‘: img.matrix.dh,
                ‘display‘: ‘block‘
            })).css(getWrapPaddingsFull(img, imgtoList));
            callback($imagewrap);
        });
 
    }
 
    /**
     * 生成原始img图像，有一层div包裹
     * @param {FileAPI.file}  fileapi的file对象
     * @param  {width: *, height: *}  imgtoList 要生成的宽和高
     * @param {function} callback回调 @param $imgobj
     * @returns {undefined} 异步方法，不返回值
     */
 
    function getDomImage(file, imgtoList, callback) {
        var $imagewrap;
        FileAPI.getInfo(file, function(err, info) {
            var r = getRatio(info, imgtoList);
            var img = FileAPI.Image(file);
 
            img.matrix.dw = info.width * r;
            img.matrix.dh = info.height * r;
 
            if (imgtoList.height === 0) {
                img.matrix.dw = imgtoList.width;
                img.matrix.dh = imgtoList.width * info.height / info.width;
            }
 
            if (imgtoList.width === 0) {
                img.matrix.dw = imgtoList.height;
                img.matrix.dh = imgtoList.height * info.width / info.height;
            }
 
            img.get(function(error, domimg) {
                if (error) {
                    alert("图片读取出错！");
                    return;
                }
                $imagewrap = $(‘<div />‘).append($(domimg));
                callback($imagewrap);
            });
 
        });
    }
 
    function recurseIterate(array, callback) {
        recurseIterate.i = recurseIterate.i || 0;
        if (i >= array.length) {
            return;
        }
        callback();
 
    }
 
    return {
        getCropArea: getCropArea,
        getCenterImage: getCenterImage,
        config: config,
        getDomImage: getDomImage,
        getCenterCropImage: getCenterCropImage
 
    };
};

 

 
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var files = [];
//源文件名称 全局变量
var filesrc;
seajs.use([ ‘arale/dialog/1.2.3/dialog‘ ,  ‘arale/dialog/1.2.3/dialog.css‘], function( Dialog) {
    //seajs.use(‘extCss/designer/uploadtpl.css‘);
    var cropUtil = new ImgCropUtil({
        imgos: {width: 360, height: 360},
        cropMain: $(‘.crop-main-imgwrap‘),
        imgPreviewWidth: 65
    });
 
    var imageLists = $(‘.crop-aside-imglists‘);
    var imgtoPreview = {width: 65, height: 0}; //编辑页面图像大小，锁定宽度为65
    var editIndex = 0; //编辑页面当前图片号
 
    var imglistTemplate = $(‘#img-list-template‘).html();
    var imglistbox = $(‘#imglistbox‘); //主页面图像预览列表
    var imgtoList = {width: 180, height: 160}; //主页面图像预览大小
 
    var pixelwidth = $(‘.edit-wrap-btn-group .pixel-width‘);
    var pixelheight = $(‘.edit-wrap-btn-group .pixel-height‘);
 
    var dialog = new Dialog({
        content: $(‘#edit-wrap‘)
    });
 
    FileAPI.event.on($(‘#choose‘).get(0), ‘change‘, function(evt) {
        var filenew = FileAPI.getFiles(evt);
//        if ((filenew.length + files.length) > 6) {
//            confirmBox.show("图片最多上传6个");
//            return;
//        }
 
        FileAPI.filterFiles(filenew, function(file, info) {
            if (/^image/.test(file.type)  ) {
                return true;
            }
            else {
                confirmBox.show("图片格式必须为 jpg/gif/png");
                return false;
            }
 
        }, function(list, other) {
            if (list.length) {
                files = files.concat(list);
 
                function recurse() {
                    recurse.i = recurse.i || 0;
                    if (recurse.i >= list.length) {
                        $(‘#imglistbox .chk:first‘).addClass(‘checked‘);
                        return;
                    }
                    cropUtil.getCenterImage(list[recurse.i], imgtoList, function($imgout) {
                        $(imglistTemplate).find(‘.figure-upload-img‘).html($imgout).end().appendTo(imglistbox);
                        recurse.i++;
                        recurse(list[recurse.i]);
                    });
                }
                recurse();  //单线递归加载图片
            }
        });
    });
 
    //删除
    imglistbox.on(‘click‘, ‘.delete-figure‘, function(e) {
        var figureupload = $(this).closest(‘.figure-upload‘);
        var index = $(‘#imglistbox .figure-upload‘).index(figureupload);
 
        confirmBox.confirm(‘您确定要删除该模板？‘, ‘请确认‘, function() {
        }, {
            onConfirm: function() {
                var that = this;
                this.set(‘message‘, ‘执行中，请稍候...‘);
                // $(obj).parents(‘.figure-upload‘).remove();
                files.splice(index, 1);
                $(‘#imglistbox .figure-upload‘).eq(index).remove();
 
                that.hide();
            },
            closeTpl: ‘ב, // 关闭的按钮设置为空
            width: 300  // 宽度设置为 300 px
        });
 
    });
 
    //编辑
    imglistbox.on(‘click‘, ‘.edit-figure‘, function(e) {
        e.preventDefault();
        dialog.show();
        pixelwidth.text("");
        pixelheight.text("");
        var figureupload = $(this).closest(‘.figure-upload‘);
 
        //设置当前编辑index
        editIndex = $(‘#imglistbox .figure-upload‘).index(figureupload);
 
        imageLists.empty();
        crop(editIndex);
 
        recurse(); //单线递归加载图片
        function recurse() {
            recurse.i = recurse.i || 0;
            if (recurse.i >= files.length) {
                recurse.i = 0;
                return;
            }
            cropUtil.getDomImage(files[recurse.i], imgtoPreview, function($imgout) {
                $imgout.addClass(‘img-preview‘).css({
                    ‘margin-bottom‘: ‘10px‘,
                    ‘cursor‘: ‘pointer‘
                }).appendTo(imageLists);
                recurse.i++;
                recurse(files[recurse.i]);
            });
        }
 
        //点击切换编辑图片
        imageLists.on(‘click‘, ‘.img-preview‘, function() {
            editIndex = $(this).index(‘.img-preview‘);
            crop(editIndex);
        });
 
        function crop(index) {
            cropUtil.getCropArea(files[index], cropUtil.config.cropMain, function(c, imgmatrix) {
                imageLists.children().eq(index).html($(this));
                files[index].edit = true;
                pixelwidth.text(Math.floor(imgmatrix.sw) + ‘px‘);
                pixelheight.text(Math.floor(imgmatrix.sh) + ‘px‘);
            });
        }
 
    });//end 编辑
 
    //保存
    $(‘#edit-comfirm-btns .ui-button-lorange‘).on(‘click‘, function() {
        //应用修改到主页面
        $.each(files, function(index, file) {
            if (file.edit) {
                var image = FileAPI.Image(files[index]);
                image.matrix = files[index].cropMatrix;
                cropUtil.getCenterCropImage(image, imgtoList, function($imgout) {
                    $(‘#imglistbox‘).children(‘.figure-upload‘).eq(index).find(‘.figure-upload-img‘).html($imgout);
                    file.outputMatrix = image.matrix;
                    file.outputMatrix.dh = 0;
                    file.outputMatrix.dw = 0;
                });
            }
        });
        dialog.hide();
    });
 
    //关闭编辑页面时清空edit属性
    dialog.after(‘hide‘, function() {
        $.each(files, function(index, file) {
            file.edit = false;
        });
 
        imageLists.css({
            ‘margin-top‘: ‘0px‘
        });
    });
 
    $(‘#edit-comfirm-btns .ui-button-grey‘).on(‘click‘, function() {
        dialog.hide();
 
    });
    //点击滑动事件
    $(‘.crop-aside-slidedown‘).on(‘click‘, function() {
        if (imageLists.children().length <= 1) {
            return;
        }
        var margintop = parseInt(imageLists.css(‘margin-top‘).replace("px", "")) || 0;
        margintop = margintop - 65;
 
        if (-margintop > ($(‘.crop-aside-imglists‘).height() - 65)) {
            return;
        }
        imageLists.animate({
            ‘margin-top‘: margintop + ‘px‘
        });
    });
 
    //设为封面 编辑页面
    $(‘#set-front‘).on(‘click‘, function() {
        $(‘#imglistbox .chk‘).removeClass(‘checked‘);
        $(‘#imglistbox .chk‘).eq(editIndex).addClass(‘checked‘);
 
    });
 
    //设为封面 主页面
 
    imglistbox.on(‘click‘, ‘.chk‘, function() {
        imglistbox.find(‘.chk‘).removeClass(‘checked‘);
        $(this).addClass(‘checked‘);
    });
 
    // 重新上传
    FileAPI.event.on($(‘#reload-img‘).get(0), ‘change‘, function(evt) {
 
        var filenew = FileAPI.getFiles(evt);
        FileAPI.filterFiles(filenew, function(file, info) {
            if (/^image/.test(file.type) && file.size < 5 * FileAPI.MB) {
                return true;
            }
            else {
                confirmBox.show("图片大小不能超过5m，并且格式必须为 jpg/gif/png");
                return false;
            }
        }, function(list, other) {
            if (list.length) {
                files[editIndex] = list[0];
                //替换当前裁剪图片
                cropUtil.getCropArea(list[0], cropUtil.config.cropMain, function(c, imgmatrix) {
                    imageLists.children().eq(editIndex).html($(this));
                    files[editIndex].edit = true;
                    pixelwidth.text(Math.floor(imgmatrix.sw) + ‘px‘);
                    pixelheight.text(Math.floor(imgmatrix.sh) + ‘px‘);
                });
                //替换主页面列表图片
                cropUtil.getCenterImage(list[0], imgtoList, function($imgout) {
                    $(‘#imglistbox‘).children(‘.figure-upload‘).eq(editIndex).find(‘.figure-upload-img‘).html($imgout);
                });
                //替换裁剪列表图片
                cropUtil.getDomImage(list[0], imgtoPreview, function($imgout) {
                    $(‘.crop-aside-imglists‘).children().eq(editIndex).html($imgout);
                });
            }
        });
    }); //end 重新上传
 
});

 


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