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  • JQuery.iviewer

    from: http://test.dpetroff.ru/jquery.iviewer/test/#

    jquery.iviewer.js:

    /*
     * iviewer Widget for jQuery UI
     * https://github.com/can3p/iviewer
     *
     * Copyright (c) 2009 - 2012 Dmitry Petrov
     * Dual licensed under the MIT and GPL licenses.
     *  - http://www.opensource.org/licenses/mit-license.php
     *  - http://www.gnu.org/copyleft/gpl.html
     *
     * Author: Dmitry Petrov
     * Version: 0.7.4
     */
    
    ( function( $, undefined ) {
    
    //this code was taken from the https://github.com/furf/jquery-ui-touch-punch
    var mouseEvents = {
            touchstart: 'mousedown',
            touchmove: 'mousemove',
            touchend: 'mouseup'
        },
        gesturesSupport = 'ongesturestart' in document.createElement('div');
    
    
    /**
     * Convert a touch event to a mouse-like
     */
    function makeMouseEvent (event) {
        var touch = event.originalEvent.changedTouches[0];
    
        return $.extend(event, {
            type:    mouseEvents[event.type],
            which:   1,
            pageX:   touch.pageX,
            pageY:   touch.pageY,
            screenX: touch.screenX,
            screenY: touch.screenY,
            clientX: touch.clientX,
            clientY: touch.clientY,
            isTouchEvent: true
        });
    }
    
    var mouseProto = $.ui.mouse.prototype,
        _mouseInit = $.ui.mouse.prototype._mouseInit;
    
    mouseProto._mouseInit = function() {
        var self = this;
        self._touchActive = false;
    
        this.element.bind( 'touchstart.' + this.widgetName, function(event) {
            if (gesturesSupport && event.originalEvent.touches.length > 1) { return; }
            self._touchActive = true;
            return self._mouseDown(makeMouseEvent(event));
        })
    
        var self = this;
        // these delegates are required to keep context
        this._mouseMoveDelegate = function(event) {
            if (gesturesSupport && event.originalEvent.touches && event.originalEvent.touches.length > 1) { return; }
            if (self._touchActive) {
                return self._mouseMove(makeMouseEvent(event));
            }
        };
        this._mouseUpDelegate = function(event) {
            if (self._touchActive) {
                self._touchActive = false;
                return self._mouseUp(makeMouseEvent(event));
            }
        };
    
        $(document)
            .bind('touchmove.'+ this.widgetName, this._mouseMoveDelegate)
            .bind('touchend.' + this.widgetName, this._mouseUpDelegate);
    
        _mouseInit.apply(this);
    }
    
    /**
     * Simple implementation of jQuery like getters/setters
     * var val = something();
     * something(val);
     */
    var setter = function(setter, getter) {
        return function(val) {
            if (arguments.length === 0) {
                return getter.apply(this);
            } else {
                setter.apply(this, arguments);
            }
        }
    };
    
    /**
     * Internet explorer rotates image relative left top corner, so we should
     * shift image when it's rotated.
     */
    var ieTransforms = {
            '0': {
                marginLeft: 0,
                marginTop: 0,
                filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=1, M12=0, M21=0, M22=1, SizingMethod="auto expand")'
            },
    
            '90': {
                marginLeft: -1,
                marginTop: 1,
                filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=0, M12=-1, M21=1, M22=0, SizingMethod="auto expand")'
            },
    
            '180': {
                marginLeft: 0,
                marginTop: 0,
                filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=-1, M12=0, M21=0, M22=-1, SizingMethod="auto expand")'
            },
    
            '270': {
                marginLeft: -1,
                marginTop: 1,
                filter: 'progid:DXImageTransform.Microsoft.Matrix(M11=0, M12=1, M21=-1, M22=0, SizingMethod="auto expand")'
            }
        },
        useIeTransforms = (jQuery.browser.msie && parseInt(jQuery.browser.version, 10) <= 8);
    
    $.widget( "ui.iviewer", $.ui.mouse, {
        widgetEventPrefix: "iviewer",
        options : {
            /**
            * start zoom value for image, not used now
            * may be equal to "fit" to fit image into container or scale in %
            **/
            zoom: "fit",
            /**
            * base value to scale image
            **/
            zoom_base: 100,
            /**
            * maximum zoom
            **/
            zoom_max: 800,
            /**
            * minimum zoom
            **/
            zoom_min: 25,
            /**
            * base of rate multiplier.
            * zoom is calculated by formula: zoom_base * zoom_delta^rate
            **/
            zoom_delta: 1.4,
            /**
            * whether the zoom should be animated.
            */
            zoom_animation: true,
            /**
            * if true plugin doesn't add its own controls
            **/
            ui_disabled: false,
            /**
             * If false mousewheel will be disabled
             */
            mousewheel: true,
            /**
            * if false, plugin doesn't bind resize event on window and this must
            * be handled manually
            **/
            update_on_resize: true,
            /**
            * event is triggered when zoom value is changed
            * @param int new zoom value
            * @return boolean if false zoom action is aborted
            **/
            onZoom: jQuery.noop,
            /**
            * event is triggered when zoom value is changed after image is set to the new dimensions
            * @param int new zoom value
            * @return boolean if false zoom action is aborted
            **/
            onAfterZoom: jQuery.noop,
            /**
            * event is fired on drag begin
            * @param object coords mouse coordinates on the image
            * @return boolean if false is returned, drag action is aborted
            **/
            onStartDrag: jQuery.noop,
            /**
            * event is fired on drag action
            * @param object coords mouse coordinates on the image
            **/
            onDrag: jQuery.noop,
            /**
            * event is fired on drag stop
            * @param object coords mouse coordinates on the image
            **/
            onStopDrag: jQuery.noop,
            /**
            * event is fired when mouse moves over image
            * @param object coords mouse coordinates on the image
            **/
            onMouseMove: jQuery.noop,
            /**
            * mouse click event
            * @param object coords mouse coordinates on the image
            **/
            onClick: jQuery.noop,
            /**
            * event is fired when image starts to load
            */
            onStartLoad: null,
            /**
            * event is fired, when image is loaded and initially positioned
            */
            onFinishLoad: null
        },
    
        _create: function() {
            var me = this;
    
            //drag variables
            this.dx = 0;
            this.dy = 0;
    
            /* object containing actual information about image
            *   @img_object.object - jquery img object
            *   @img_object.orig_{width|height} - original dimensions
            *   @img_object.display_{width|height} - actual dimensions
            */
            this.img_object = {};
    
            this.zoom_object = {}; //object to show zoom status
    
            this._angle = 0;
    
            this.current_zoom = this.options.zoom;
    
            if(this.options.src === null){
                return;
            }
    
            this.container = this.element;
    
            this._updateContainerInfo();
    
            //init container
            this.container.css("overflow","hidden");
    
            if(this.options.update_on_resize == true)
            {
                $(window).resize(function()
                {
                    me._updateContainerInfo();
                });
            }
    
            this.img_object = new $.ui.iviewer.ImageObject(this.options.zoom_animation);
    
            if (this.options.mousewheel) {
                this.img_object.object()
                    .mousewheel(function(ev, delta)
                    {
                        //this event is there instead of containing div, because
                        //at opera it triggers many times on div
                        var zoom = (delta > 0)?1:-1,
                            container_offset = me.container.offset(),
                            mouse_pos = {
                                x: ev.pageX - container_offset.left,
                                y: ev.pageY - container_offset.top
                            };
    
                        me.zoom_by(zoom, mouse_pos);
                        return false;
                    });
    
                if (gesturesSupport) {
                    var gestureThrottle = +new Date();
                    var originalScale, originalCenter;
                    this.img_object.object()
                        // .bind('gesturestart', function(ev) {
                        .bind('touchstart', function(ev) {
                            originalScale = me.current_zoom;
                            var touches = ev.originalEvent.touches,
                                container_offset;
                            if (touches.length == 2) {
                                container_offset = me.container.offset();
                                originalCenter = {
                                    x: (touches[0].pageX + touches[1].pageX) / 2  - container_offset.left,
                                    y: (touches[0].pageY + touches[1].pageY) / 2 - container_offset.top
                                };
                            } else {
                                originalCenter = null;
                            }
                        }).bind('gesturechange', function(ev) {
                            //do not want to import throttle function from underscore
                            var d = +new Date();
                            if ((d - gestureThrottle) < 50) { return; }
                            gestureThrottle = d;
                            var zoom = originalScale * ev.originalEvent.scale;
                            me.set_zoom(zoom, originalCenter);
                            ev.preventDefault();
                        }).bind('gestureend', function(ev) {
                            originalCenter = null;
                        });
                }
            }
    
            //init object
            this.img_object.object()
                //bind mouse events
                .click(function(e){return me._click(e)})
                    .prependTo(this.container);
    
            this.container.bind('mousemove', function(ev) { me._handleMouseMove(ev); });
    
            this.loadImage(this.options.src);
    
            if(!this.options.ui_disabled)
            {
                this.createui();
            }
    
            this._mouseInit();
        },
    
        destroy: function() {
            this._mouseDestroy();
        },
    
        _updateContainerInfo: function()
        {
            this.options.height = this.container.height();
            this.options.width = this.container.width();
        },
    
        loadImage: function( src )
        {
            this.current_zoom = this.options.zoom;
            var me = this;
    
            this._trigger('onStartLoad', 0, src);
    
            this.container.addClass("iviewer_loading");
            this.img_object.load(src, function() {
                me._imageLoaded(src);
            });
        },
    
        _imageLoaded: function(src) {
            this.container.removeClass("iviewer_loading");
            this.container.addClass("iviewer_cursor");
    
            if(this.options.zoom == "fit"){
                this.fit(true);
            }
            else {
                this.set_zoom(this.options.zoom, true);
            }
    
            this._trigger('onFinishLoad', 0, src);
        },
    
        /**
        * fits image in the container
        *
        * @param {boolean} skip_animation
        **/
        fit: function(skip_animation)
        {
            var aspect_ratio = this.img_object.orig_width() / this.img_object.orig_height();
            var window_ratio = this.options.width /  this.options.height;
            var choose_left = (aspect_ratio > window_ratio);
            var new_zoom = 0;
    
            if(choose_left){
                new_zoom = this.options.width / this.img_object.orig_width() * 100;
            }
            else {
                new_zoom = this.options.height / this.img_object.orig_height() * 100;
            }
    
          this.set_zoom(new_zoom, skip_animation);
        },
    
        /**
        * center image in container
        **/
        center: function()
        {
            this.setCoords(-Math.round((this.img_object.display_width() - this.options.width)/2),
                    -Math.round((this.img_object.display_height() - this.options.height)/2));
        },
    
        /**
        *   move a point in container to the center of display area
        *   @param x a point in container
        *   @param y a point in container
        **/
        moveTo: function(x, y)
        {
            var dx = x-Math.round(this.options.width/2);
            var dy = y-Math.round(this.options.height/2);
    
            var new_x = this.img_object.x() - dx;
            var new_y = this.img_object.y() - dy;
    
            this.setCoords(new_x, new_y);
        },
    
        /**
         * Get container offset object.
         */
        getContainerOffset: function() {
            return jQuery.extend({}, this.container.offset());
        },
    
        /**
        * set coordinates of upper left corner of image object
        **/
        setCoords: function(x,y)
        {
            //do nothing while image is being loaded
            if(!this.img_object.loaded()) { return; }
    
            var coords = this._correctCoords(x,y);
            this.img_object.x(coords.x);
            this.img_object.y(coords.y);
        },
    
        _correctCoords: function( x, y )
        {
            x = parseInt(x, 10);
            y = parseInt(y, 10);
    
            //check new coordinates to be correct (to be in rect)
            if(y > 0){
                y = 0;
            }
            if(x > 0){
                x = 0;
            }
            if(y + this.img_object.display_height() < this.options.height){
                y = this.options.height - this.img_object.display_height();
            }
            if(x + this.img_object.display_width() < this.options.width){
                x = this.options.width - this.img_object.display_width();
            }
            if(this.img_object.display_width() <= this.options.width){
                x = -(this.img_object.display_width() - this.options.width)/2;
            }
            if(this.img_object.display_height() <= this.options.height){
                y = -(this.img_object.display_height() - this.options.height)/2;
            }
    
            return { x: x, y:y };
        },
    
    
        /**
        * convert coordinates on the container to the coordinates on the image (in original size)
        *
        * @return object with fields x,y according to coordinates or false
        * if initial coords are not inside image
        **/
        containerToImage : function (x,y)
        {
            var coords = { x : x - this.img_object.x(),
                     y :  y - this.img_object.y()
            };
    
            coords = this.img_object.toOriginalCoords(coords);
    
            return { x :  util.descaleValue(coords.x, this.current_zoom),
                     y :  util.descaleValue(coords.y, this.current_zoom)
            };
        },
    
        /**
        * convert coordinates on the image (in original size, and zero angle) to the coordinates on the container
        *
        * @return object with fields x,y according to coordinates
        **/
        imageToContainer : function (x,y)
        {
            var coords = {
                    x : util.scaleValue(x, this.current_zoom),
                    y : util.scaleValue(y, this.current_zoom)
                };
    
            return this.img_object.toRealCoords(coords);
        },
    
        /**
        * get mouse coordinates on the image
        * @param e - object containing pageX and pageY fields, e.g. mouse event object
        *
        * @return object with fields x,y according to coordinates or false
        * if initial coords are not inside image
        **/
        _getMouseCoords : function(e)
        {
            var containerOffset = this.container.offset();
                coords = this.containerToImage(e.pageX - containerOffset.left, e.pageY - containerOffset.top);
    
            return coords;
        },
    
        /**
        * set image scale to the new_zoom
        *
        * @param {number} new_zoom image scale in %
        * @param {boolean} skip_animation
        * @param {x: number, y: number} Coordinates of point the should not be moved on zoom. The default is the center of image.
        **/
        set_zoom: function(new_zoom, skip_animation, zoom_center)
        {
            if (this._trigger('onZoom', 0, new_zoom) == false) {
                return;
            }
    
            //do nothing while image is being loaded
            if(!this.img_object.loaded()) { return; }
    
            zoom_center = zoom_center || {
                x: Math.round(this.options.width/2),
                y: Math.round(this.options.height/2)
            }
    
            if(new_zoom <  this.options.zoom_min)
            {
                new_zoom = this.options.zoom_min;
            }
            else if(new_zoom > this.options.zoom_max)
            {
                new_zoom = this.options.zoom_max;
            }
    
            /* we fake these values to make fit zoom properly work */
            if(this.current_zoom == "fit")
            {
                var old_x = zoom_center.x + Math.round(this.img_object.orig_width()/2);
                var old_y = zoom_center.y + Math.round(this.img_object.orig_height()/2);
                this.current_zoom = 100;
            }
            else {
                var old_x = -this.img_object.x() + zoom_center.x;
                var old_y = -this.img_object.y() + zoom_center.y
            }
    
            var new_width = util.scaleValue(this.img_object.orig_width(), new_zoom);
            var new_height = util.scaleValue(this.img_object.orig_height(), new_zoom);
            var new_x = util.scaleValue( util.descaleValue(old_x, this.current_zoom), new_zoom);
            var new_y = util.scaleValue( util.descaleValue(old_y, this.current_zoom), new_zoom);
    
            new_x = zoom_center.x - new_x;
            new_y = zoom_center.y - new_y;
    
            new_width = Math.floor(new_width);
            new_height = Math.floor(new_height);
            new_x = Math.floor(new_x);
            new_y = Math.floor(new_y);
    
            this.img_object.display_width(new_width);
            this.img_object.display_height(new_height);
    
            var coords = this._correctCoords( new_x, new_y ),
                self = this;
    
            this.img_object.setImageProps(new_width, new_height, coords.x, coords.y,
                                            skip_animation, function() {
                self._trigger('onAfterZoom', 0, new_zoom );
            });
            this.current_zoom = new_zoom;
    
            this.update_status();
        },
    
        /**
        * changes zoom scale by delta
        * zoom is calculated by formula: zoom_base * zoom_delta^rate
        * @param Integer delta number to add to the current multiplier rate number
        * @param {x: number, y: number=} Coordinates of point the should not be moved on zoom.
        **/
        zoom_by: function(delta, zoom_center)
        {
            var closest_rate = this.find_closest_zoom_rate(this.current_zoom);
    
            var next_rate = closest_rate + delta;
            var next_zoom = this.options.zoom_base * Math.pow(this.options.zoom_delta, next_rate)
            if(delta > 0 && next_zoom < this.current_zoom)
            {
                next_zoom *= this.options.zoom_delta;
            }
    
            if(delta < 0 && next_zoom > this.current_zoom)
            {
                next_zoom /= this.options.zoom_delta;
            }
    
            this.set_zoom(next_zoom, undefined, zoom_center);
        },
    
        /**
        * Rotate image
        * @param {num} deg Degrees amount to rotate. Positive values rotate image clockwise.
        *     Currently 0, 90, 180, 270 and -90, -180, -270 values are supported
        *
        * @param {boolean} abs If the flag is true if, the deg parameter will be considered as
        *     a absolute value and relative otherwise.
        * @return {num|null} Method will return current image angle if called without any arguments.
        **/
        angle: function(deg, abs) {
            if (arguments.length === 0) { return this.img_object.angle(); }
    
            if (deg < -270 || deg > 270 || deg % 90 !== 0) { return; }
            if (!abs) { deg += this.img_object.angle(); }
            if (deg < 0) { deg += 360; }
            if (deg >= 360) { deg -= 360; }
    
            if (deg === this.img_object.angle()) { return; }
    
            this.img_object.angle(deg);
            //the rotate behavior is different in all editors. For now we  just center the
            //image. However, it will be better to try to keep the position.
            this.center();
            this._trigger('angle', 0, { angle: this.img_object.angle() });
        },
    
        /**
        * finds closest multiplier rate for value
        * basing on zoom_base and zoom_delta values from settings
        * @param Number value zoom value to examine
        **/
        find_closest_zoom_rate: function(value)
        {
            if(value == this.options.zoom_base)
            {
                return 0;
            }
    
            function div(val1,val2) { return val1 / val2 };
            function mul(val1,val2) { return val1 * val2 };
    
            var func = (value > this.options.zoom_base)?mul:div;
            var sgn = (value > this.options.zoom_base)?1:-1;
    
            var mltplr = this.options.zoom_delta;
            var rate = 1;
    
            while(Math.abs(func(this.options.zoom_base, Math.pow(mltplr,rate)) - value) >
                  Math.abs(func(this.options.zoom_base, Math.pow(mltplr,rate+1)) - value))
            {
                rate++;
            }
    
            return sgn * rate;
        },
    
        /* update scale info in the container */
        update_status: function()
        {
            if(!this.options.ui_disabled)
            {
                var percent = Math.round(100*this.img_object.display_height()/this.img_object.orig_height());
                if(percent)
                {
                    this.zoom_object.html(percent + "%");
                }
            }
        },
    
        /**
         * Get some information about the image.
         *     Currently orig_(width|height), display_(width|height), angle, zoom and src params are supported.
         *
         *  @param {string} parameter to check
         *  @param {boolean} withoutRotation if param is orig_width or orig_height and this flag is set to true,
         *      method will return original image width without considering rotation.
         *
         */
        info: function(param, withoutRotation) {
            if (!param) { return; }
    
            switch (param) {
                case 'orig_width':
                case 'orig_height':
                    if (withoutRotation) {
                        return (this.img_object.angle() % 180 === 0 ? this.img_object[param]() :
                                param === 'orig_width' ? this.img_object.orig_height() : 
                                                            this.img_object.orig_width());
                    } else {
                        return this.img_object[param]();
                    }
                case 'display_width':
                case 'display_height':
                case 'angle':
                    return this.img_object[param]();
                case 'zoom':
                    return this.current_zoom;
                case 'src':
                    return this.img_object.object().attr('src');
                case 'coords':
                    return {
                        x: this.img_object.x(),
                        y: this.img_object.y()
                    };
            }
        },
    
        /**
        *   callback for handling mousdown event to start dragging image
        **/
        _mouseStart: function( e )
        {
            $.ui.mouse.prototype._mouseStart.call(this, e);
            if (this._trigger('onStartDrag', 0, this._getMouseCoords(e)) === false) {
                return false;
            }
    
            /* start drag event*/
            this.container.addClass("iviewer_drag_cursor");
    
            //#10: fix movement quirks for ipad
            this._dragInitialized = !(e.originalEvent.changedTouches && e.originalEvent.changedTouches.length==1);
    
            this.dx = e.pageX - this.img_object.x();
            this.dy = e.pageY - this.img_object.y();
            return true;
        },
    
        _mouseCapture: function( e ) {
            return true;
        },
    
        /**
         * Handle mouse move if needed. User can avoid using this callback, because
         *    he can get the same information through public methods.
         *  @param {jQuery.Event} e
         */
        _handleMouseMove: function(e) {
            this._trigger('onMouseMove', e, this._getMouseCoords(e));
        },
    
        /**
        *   callback for handling mousemove event to drag image
        **/
        _mouseDrag: function(e)
        {
            $.ui.mouse.prototype._mouseDrag.call(this, e);
    
            //#10: imitate mouseStart, because we can get here without it on iPad for some reason
            if (!this._dragInitialized) {
                this.dx = e.pageX - this.img_object.x();
                this.dy = e.pageY - this.img_object.y();
                this._dragInitialized = true;
            }
    
            var ltop =  e.pageY - this.dy;
            var lleft = e.pageX - this.dx;
    
            this.setCoords(lleft, ltop);
            this._trigger('onDrag', e, this._getMouseCoords(e));
            return false;
        },
    
        /**
        *   callback for handling stop drag
        **/
        _mouseStop: function(e)
        {
            $.ui.mouse.prototype._mouseStop.call(this, e);
            this.container.removeClass("iviewer_drag_cursor");
            this._trigger('onStopDrag', 0, this._getMouseCoords(e));
        },
    
        _click: function(e)
        {
            this._trigger('onClick', 0, this._getMouseCoords(e));
        },
    
        /**
        *   create zoom buttons info box
        **/
        createui: function()
        {
            var me=this;
    
            $("<div>", { 'class': "iviewer_zoom_in iviewer_common iviewer_button"})
                        .bind('mousedown touchstart',function(){me.zoom_by(1); return false;})
                        .appendTo(this.container);
    
            $("<div>", { 'class': "iviewer_zoom_out iviewer_common iviewer_button"})
                        .bind('mousedown touchstart',function(){me.zoom_by(- 1); return false;})
                        .appendTo(this.container);
    
            $("<div>", { 'class': "iviewer_zoom_zero iviewer_common iviewer_button"})
                        .bind('mousedown touchstart',function(){me.set_zoom(100); return false;})
                        .appendTo(this.container);
    
            $("<div>", { 'class': "iviewer_zoom_fit iviewer_common iviewer_button"})
                        .bind('mousedown touchstart',function(){me.fit(this); return false;})
                        .appendTo(this.container);
    
            this.zoom_object = $("<div>").addClass("iviewer_zoom_status iviewer_common")
                                        .appendTo(this.container);
    
            $("<div>", { 'class': "iviewer_rotate_left iviewer_common iviewer_button"})
                        .bind('mousedown touchstart',function(){me.angle(-90); return false;})
                        .appendTo(this.container);
    
            $("<div>", { 'class': "iviewer_rotate_right iviewer_common iviewer_button" })
                        .bind('mousedown touchstart',function(){me.angle(90); return false;})
                        .appendTo(this.container);
    
            this.update_status(); //initial status update
        }
    
    } );
    
    /**
     * @class $.ui.iviewer.ImageObject Class represents image and provides public api without
     *     extending image prototype.
     * @constructor
     * @param {boolean} do_anim Do we want to animate image on dimension changes?
     */
    $.ui.iviewer.ImageObject = function(do_anim) {
        this._img = $("<img>")
                //this is needed, because chromium sets them auto otherwise
                .css({ position: "absolute", top :"0px", left: "0px"});
    
        this._loaded = false;
        this._swapDimensions = false;
        this._do_anim = do_anim || false;
        this.x(0, true);
        this.y(0, true);
        this.angle(0);
    };
    
    
    /** @lends $.ui.iviewer.ImageObject.prototype */
    (function() {
        /**
         * Restore initial object state.
         *
         * @param {number} w Image width.
         * @param {number} h Image height.
         */
        this._reset = function(w, h) {
            this._angle = 0;
            this._swapDimensions = false;
            this.x(0);
            this.y(0);
    
            this.orig_width(w);
            this.orig_height(h);
            this.display_width(w);
            this.display_height(h);
        };
    
        /**
         * Check if image is loaded.
         *
         * @return {boolean}
         */
        this.loaded = function() { return this._loaded; };
    
        /**
         * Load image.
         *
         * @param {string} src Image url.
         * @param {Function=} loaded Function will be called on image load.
         */
        this.load = function(src, loaded) {
            var self = this;
    
            loaded = loaded || jQuery.noop;
            this._loaded = false;
    
            //If we assign new image url to the this._img IE9 fires onload event and image width and
            //height are set to zero. So, we create another image object and load image through it.
            var img = new Image();
            img.onload = function() {
                self._loaded = true;
                self._reset(this.width, this.height);
    
                self._img
                    .removeAttr("src")
                    .removeAttr("width")
                    .removeAttr("height")
                    .removeAttr("style")
                    //max-width is reset, because plugin breaks in the twitter bootstrap otherwise
                    .css({ position: "absolute", top :"0px", left: "0px", maxWidth: "none"})
    
                self._img[0].src = src;
                loaded();
            };
    
            img.src = src;
            this.angle(0);
        };
    
        this._dimension = function(prefix, name) {
            var horiz = '_' + prefix + '_' + name,
                vert = '_' + prefix + '_' + (name === 'height' ? 'width' : 'height');
            return setter(function(val) {
                    this[this._swapDimensions ? horiz: vert] = val;
                },
                function() {
                    return this[this._swapDimensions ? horiz: vert];
                });
        };
    
        /**
         * Getters and setter for common image dimensions.
         *    display_ means real image tag dimensions
         *    orig_ means physical image dimensions.
         *  Note, that dimensions are swapped if image is rotated. It necessary,
         *  because as little as possible code should know about rotation.
         */
        this.display_width = this._dimension('display', 'width'),
        this.display_height = this._dimension('display', 'height'),
        this.display_diff = function() { return Math.floor( this.display_width() - this.display_height() ) };
        this.orig_width = this._dimension('orig', 'width'),
        this.orig_height = this._dimension('orig', 'height'),
    
        /**
         * Setter for  X coordinate. If image is rotated we need to additionaly shift an
         *     image to map image coordinate to the visual position.
         *
         * @param {number} val Coordinate value.
         * @param {boolean} skipCss If true, we only set the value and do not touch the dom.
         */
        this.x = setter(function(val, skipCss) { 
                this._x = val;
                if (!skipCss) {
                    this._img.css("left",this._x + (this._swapDimensions ? this.display_diff() / 2 : 0) + "px");
                }
            },
            function() {
                return this._x;
            });
    
        /**
         * Setter for  Y coordinate. If image is rotated we need to additionaly shift an
         *     image to map image coordinate to the visual position.
         *
         * @param {number} val Coordinate value.
         * @param {boolean} skipCss If true, we only set the value and do not touch the dom.
         */
        this.y = setter(function(val, skipCss) {
                this._y = val;
                if (!skipCss) {
                    this._img.css("top",this._y - (this._swapDimensions ? this.display_diff() / 2 : 0) + "px");
                }
            },
           function() {
                return this._y;
           });
    
        /**
         * Perform image rotation.
         *
         * @param {number} deg Absolute image angle. The method will work with values 0, 90, 180, 270 degrees.
         */
        this.angle = setter(function(deg) {
                var prevSwap = this._swapDimensions;
    
                this._angle = deg;
                this._swapDimensions = deg % 180 !== 0;
                
                if (prevSwap !== this._swapDimensions) {
                    var verticalMod = this._swapDimensions ? -1 : 1;
                    this.x(this.x() - verticalMod * this.display_diff() / 2, true);
                    this.y(this.y() + verticalMod * this.display_diff() / 2, true);
                };
    
                var cssVal = 'rotate(' + deg + 'deg)',
                    img = this._img;
    
                jQuery.each(['', '-webkit-', '-moz-', '-o-', '-ms-'], function(i, prefix) {
                    img.css(prefix + 'transform', cssVal);
                });
    
                if (useIeTransforms) {
                    jQuery.each(['-ms-', ''], function(i, prefix) {
                        img.css(prefix + 'filter', ieTransforms[deg].filter);
                    });
    
                    img.css({
                        marginLeft: ieTransforms[deg].marginLeft * this.display_diff() / 2,
                        marginTop: ieTransforms[deg].marginTop * this.display_diff() / 2
                    });
                }
            },
           function() { return this._angle; });
    
        /**
         * Map point in the container coordinates to the point in image coordinates.
         *     You will get coordinates of point on image with respect to rotation,
         *     but will be set as if image was not rotated.
         *     So, if image was rotated 90 degrees, it's (0,0) point will be on the
         *     top right corner.
         *
         * @param {{x: number, y: number}} point Point in container coordinates.
         * @return  {{x: number, y: number}}
         */
        this.toOriginalCoords = function(point) {
            switch (this.angle()) {
                case 0: return { x: point.x, y: point.y }
                case 90: return { x: point.y, y: this.display_width() - point.x }
                case 180: return { x: this.display_width() - point.x, y: this.display_height() - point.y }
                case 270: return { x: this.display_height() - point.y, y: point.x }
            }
        };
    
        /**
         * Map point in the image coordinates to the point in container coordinates.
         *     You will get coordinates of point on container with respect to rotation.
         *     Note, if image was rotated 90 degrees, it's (0,0) point will be on the
         *     top right corner.
         *
         * @param {{x: number, y: number}} point Point in container coordinates.
         * @return  {{x: number, y: number}}
         */
        this.toRealCoords = function(point) {
            switch (this.angle()) {
                case 0: return { x: this.x() + point.x, y: this.y() + point.y }
                case 90: return { x: this.x() + this.display_width() - point.y, y: this.y() + point.x}
                case 180: return { x: this.x() + this.display_width() - point.x, y: this.y() + this.display_height() - point.y}
                case 270: return { x: this.x() + point.y, y: this.y() + this.display_height() - point.x}
            }
        };
    
        /**
         * @return {jQuery} Return image node. this is needed to add event handlers.
         */
        this.object = setter(jQuery.noop,
                               function() { return this._img; });
    
        /**
         * Change image properties.
         *
         * @param {number} disp_w Display width;
         * @param {number} disp_h Display height;
         * @param {number} x
         * @param {number} y
         * @param {boolean} skip_animation If true, the animation will be skiped despite the
         *     value set in constructor.
         * @param {Function=} complete Call back will be fired when zoom will be complete.
         */
        this.setImageProps = function(disp_w, disp_h, x, y, skip_animation, complete) {
            complete = complete || jQuery.noop;
    
            this.display_width(disp_w);
            this.display_height(disp_h);
            this.x(x, true);
            this.y(y, true);
    
            var w = this._swapDimensions ? disp_h : disp_w;
            var h = this._swapDimensions ? disp_w : disp_h;
    
            var params = {
                 w,
                height: h,
                top: y - (this._swapDimensions ? this.display_diff() / 2 : 0) + "px",
                left: x + (this._swapDimensions ? this.display_diff() / 2 : 0) + "px" 
            };
    
            if (useIeTransforms) {
                jQuery.extend(params, {
                    marginLeft: ieTransforms[this.angle()].marginLeft * this.display_diff() / 2,
                    marginTop: ieTransforms[this.angle()].marginTop * this.display_diff() / 2
                });
            }
    
            var swapDims = this._swapDimensions,
                img = this._img;
    
            //here we come: another IE oddness. If image is rotated 90 degrees with a filter, than
            //width and height getters return real width and height of rotated image. The bad news
            //is that to set height you need to set a width and vice versa. Fuck IE.
            //So, in this case we have to animate width and height manually.
            if(useIeTransforms && swapDims) {
                var ieh = this._img.width(),
                    iew = this._img.height(),
                    iedh = params.height - ieh;
                    iedw = params.width - iew;
    
                delete params.width;
                delete params.height;
            }
    
            if (this._do_anim && !skip_animation) {
                this._img.stop(true)
                    .animate(params, {
                        duration: 200, 
                        complete: complete,
                        step: function(now, fx) {
                            if(useIeTransforms && swapDims && (fx.prop === 'top')) {
                                var percent = (now - fx.start) / (fx.end - fx.start);
    
                                img.height(ieh + iedh * percent);
                                img.width(iew + iedw * percent);
                                img.css('top', now);
                            }
                        }
                    });
            } else {
                this._img.css(params);
                setTimeout(complete, 0); //both if branches should behave equally.
            }
        };
    
    }).apply($.ui.iviewer.ImageObject.prototype);
    
    
    
    var util = {
        scaleValue: function(value, toZoom)
        {
            return value * toZoom / 100;
        },
    
        descaleValue: function(value, fromZoom)
        {
            return value * 100 / fromZoom;
        }
    };
    
     } )( jQuery, undefined );
    
    
    <!DOCTYPE html>
    <html>
        <head>
            <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
            <title>jquery.iviewer test</title>
            <script type="text/javascript" src="jquery.js" ></script>
            <script type="text/javascript" src="jqueryui.js" ></script>
            <script type="text/javascript" src="jquery.mousewheel.min.js" ></script>
            <script type="text/javascript" src="jquery.iviewer.js" ></script>
            <script type="text/javascript">
                var $ = jQuery;
                $(document).ready(function(){
                      var iv1 = $("#viewer").iviewer({
                           src: "test_image.jpg", 
                           update_on_resize: false,
                           zoom_animation: false,
                           mousewheel: false,
                           onMouseMove: function(ev, coords) { },
                           onStartDrag: function(ev, coords) { return false; }, //this image will not be dragged
                           onDrag: function(ev, coords) { }
                      });
    
                       $("#in").click(function(){ iv1.iviewer('zoom_by', 1); }); 
                       $("#out").click(function(){ iv1.iviewer('zoom_by', -1); }); 
                       $("#fit").click(function(){ iv1.iviewer('fit'); }); 
                       $("#orig").click(function(){ iv1.iviewer('set_zoom', 100); }); 
                       $("#update").click(function(){ iv1.iviewer('update_container_info'); });
    
                      var iv2 = $("#viewer2").iviewer(
                      {
                          src: "test_image2.jpg"
                      });
    
                      $("#chimg").click(function()
                      {
                        iv2.iviewer('loadImage', "test_image.jpg");
                        return false;
                      });
                });
            </script>
            <link rel="stylesheet" href="jquery.iviewer.css" />
            <style>
                .viewer
                {
                     50%;
                    height: 500px;
                    border: 1px solid black;
                    position: relative;
                }
                
                .wrapper
                {
                    overflow: hidden;
                }
            </style>
        </head>
        <body>
            <h1>JQuery.iviewer test</h1>
            <!-- wrapper div is needed for opera because it shows scroll bars for reason -->
            <div class="wrapper">
                <span>
                    <a id="in" href="#">+</a>
                    <a id="out" href="#">-</a>
                    <a id="fit" href="#">fit</a>
                    <a id="orig" href="#">orig</a>
                    <a id="update" href="#">update</a>
                </span>
                <div id="viewer" class="viewer"></div>
                <br />
                <div id="viewer2" class="viewer"></div>
                <br />
                <p><a href="#" id="chimg">Change Image</a></p>
            </div>
        </body>
    </html>
    

     效果圖:

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  • 原文地址:https://www.cnblogs.com/geovindu/p/3214572.html
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