chadicus / test-helpers

docs/js/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: 0.7.7
 */

( 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; }

Are you sure this return statement is not missing an argument? If this is intended, consider adding an explicit undefined like return undefined;.

        self._touchActive = true;
        return self._mouseDown(makeMouseEvent(event));
    })

    var self = this;

The variable self already seems to be declared on line 48. Consider using another variable name or omitting the var keyword.

    // these delegates are required to keep context
    this._mouseMoveDelegate = function(event) {
        if (gesturesSupport && event.originalEvent.touches && event.originalEvent.touches.length > 1) { return; }

Are you sure this return statement is not missing an argument? If this is intended, consider adding an explicit undefined like return undefined;.

        if (self._touchActive) {

There is no return statement if self._touchActive is false. Are you sure this is correct? If so, consider adding return; explicitly.

            return self._mouseMove(makeMouseEvent(event));
        }
    };
    this._mouseUpDelegate = function(event) {
        if (self._touchActive) {

There is no return statement if self._touchActive is false. Are you sure this is correct? If so, consider adding return; explicitly.

            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) {

The parameter val is not used and could be removed.

        if (arguments.length === 0) {
            return getter.apply(this);
        } else {

else is not necessary here since all if branches return, consider removing it to reduce nesting and make code more readable.

            setter.apply(this, arguments);

There is no return statement in this branch, but you do return something in other branches. Did you maybe miss it? If you do not want to return anything, consider adding return undefined; explicitly.

        }
    }
};

/**
 * 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")'
        }
    },
    // this test is the inversion of the css filters test from the modernizr project
    useIeTransforms = function() {
        var modElem = document.createElement('modernizr'),
		mStyle = modElem.style,
		omPrefixes = 'Webkit Moz O ms',
		domPrefixes = omPrefixes.toLowerCase().split(' '),
        	props = ("transform" + ' ' + domPrefixes.join("Transform ") + "Transform").split(' ');
        for ( var i in props ) {

A for in loop automatically includes the property of any prototype object, consider checking the key using hasOwnProperty.

            var prop = props[i];
            if ( !$.contains(prop, "-") && mStyle[prop] !== undefined ) {
                return false;
            }
        }
        return true;
    }();

$.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,
        /**
        * event is fired when image load error occurs
        */
        onErrorLoad: 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) {

Comparing this.options.update_on_resize to true using the == operator is not safe. Consider using === instead.

            $(window).resize(function() {
                me.update();
            });
        }

        this.img_object = new $.ui.iviewer.ImageObject(this.options.zoom_animation);

        if (this.options.mousewheel) {
            this.container.bind('mousewheel.iviewer', 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 = {
                            //jquery.mousewheel 3.1.0 uses strange MozMousePixelScroll event
                            //which is not being fixed by jQuery.Event
                            x: (ev.pageX || ev.originalEvent.pageX) - container_offset.left,
                            y: (ev.pageY || ev.originalEvent.pageX) - 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) {

The parameter ev is not used and could be removed.

                        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() {
        $.Widget.prototype.destroy.call( this );
        this._mouseDestroy();
        this.img_object.object().remove();
        this.container.off('.iviewer');
        this.container.css('overflow', ''); //cleanup styles on destroy
    },

    _updateContainerInfo: function()
    {
        this.options.height = this.container.height();
        this.options.width = this.container.width();
    },

    update: function()
    {
        this._updateContainerInfo()
        this.setCoords(this.img_object.x(), this.img_object.y());
    },

    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);
        }, function() {
            me._trigger("onErrorLoad", 0, 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);

The variable coords seems to be never declared. Assigning variables without defining them first makes them global. If this was intended, consider making it explicit like using window.coords.

        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) {

Comparing this._trigger("onZoom", 0, new_zoom) to false using the == operator is not safe. Consider using === instead.

            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;

The variable old_x already seems to be declared on line 567. Consider using another variable name or omitting the var keyword.

            var old_y = -this.img_object.y() + zoom_center.y

The variable old_y already seems to be declared on line 568. Consider using another variable name or omitting the var keyword.

        }

        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; }

Are you sure this return statement is not missing an argument? If this is intended, consider adding an explicit undefined like return undefined;.

        if (!abs) { deg += this.img_object.angle(); }
        if (deg < 0) { deg += 360; }
        if (deg >= 360) { deg -= 360; }

        if (deg === this.img_object.angle()) { return; }

Are you sure this return statement is not missing an argument? If this is intended, consider adding an explicit undefined like return undefined;.

        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() });

There is no return statement in this branch, but you do return something in other branches. Did you maybe miss it? If you do not want to return anything, consider adding return undefined; explicitly.

    },

    /**
    * 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; }

Are you sure this return statement is not missing an argument? If this is intended, consider adding an explicit undefined like return undefined;.

        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 {

else is not necessary here since all if branches return, consider removing it to reduce nesting and make code more readable.

                    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()
                };
        }

There is no default case in this switch, so nothing gets returned when all cases fail. You might want to consider adding a default or return undefined explicitly.

    },

    /**
    *   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);

Comparing e.originalEvent.changedTouches.length to 1 using the == operator is not safe. Consider using === instead.

        this.dx = e.pageX - this.img_object.x();
        this.dy = e.pageY - this.img_object.y();
        return true;
    },

    _mouseCapture: function( e ) {

The parameter e is not used and could be removed.

        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, error) {
        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();

The variable Image seems to be never declared. If this is a global, consider adding a /** global: Image */ comment.

        img.onload = function() {
            self._loaded = true;
            self._reset(this.width, this.height);

            self._img
                .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.onerror = error;

        //we need this because sometimes internet explorer 8 fires onload event
        //right after assignment (synchronously)
        setTimeout(function() {
            img.src = src;
        }, 0);

        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'),

Usage of the sequence operator is discouraged, since it may lead to obfuscated code.

    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'),

Usage of the sequence operator is discouraged, since it may lead to obfuscated code.

    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._finishAnimation();
                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._finishAnimation();
                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 }
        }

There is no default case in this switch, so nothing gets returned when all cases fail. You might want to consider adding a default or return undefined explicitly.

    };

    /**
     * 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}
        }

There is no default case in this switch, so nothing gets returned when all cases fail. You might want to consider adding a default or return undefined explicitly.

    };

    /**
     * @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 = {
            width: 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;

The variable iedw seems to be never declared. Assigning variables without defining them first makes them global. If this was intended, consider making it explicit like using window.iedw.

            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);

The variable iedh does not seem to be initialized in case useIeTransforms && swapDims on line 1117 is false. Are you sure this can never be the case?

The variable ieh does not seem to be initialized in case useIeTransforms && swapDims on line 1117 is false. Are you sure this can never be the case?

                            img.width(iew + iedw * percent);

The variable iew does not seem to be initialized in case useIeTransforms && swapDims on line 1117 is false. Are you sure this can never be the case?

The variable iedw does not seem to be initialized in case useIeTransforms && swapDims on line 1117 is false. Are you sure this can never be the case?

                            img.css('top', now);
                        }
                    }
                });
        } else {
            this._img.css(params);
            setTimeout(complete, 0); //both if branches should behave equally.
        }
    };

    //if we set image coordinates we need to be sure that no animation is active atm
    this._finishAnimation = function() {
      this._img.stop(true, true);
    }

}).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 );