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jquery.imgareaselect.js (38166B)

---

 /*
  * imgAreaSelect jQuery plugin
  * version 0.9.10-wp
  *
  * Copyright (c) 2008-2013 Michal Wojciechowski (odyniec.net)
  *
  * Dual licensed under the MIT (MIT-LICENSE.txt)
  * and GPL (GPL-LICENSE.txt) licenses.
  *
  * https://github.com/odyniec/imgareaselect
  *
  */
 
 (function($) {
 
 /*
  * Math functions will be used extensively, so it's convenient to make a few
  * shortcuts
  */
 var abs = Math.abs,
     max = Math.max,
     min = Math.min,
     round = Math.round;
 
 /**
  * Create a new HTML div element
  *
  * @return A jQuery object representing the new element
  */
 function div() {
     return $('<div/>');
 }
 
 /**
  * imgAreaSelect initialization
  *
  * @param img
  *            A HTML image element to attach the plugin to
  * @param options
  *            An options object
  */
 $.imgAreaSelect = function (img, options) {
     var
         /* jQuery object representing the image */
         $img = $(img),
 
         /* Has the image finished loading? */
         imgLoaded,
 
         /* Plugin elements */
 
         /* Container box */
         $box = div(),
         /* Selection area */
         $area = div(),
         /* Border (four divs) */
         $border = div().add(div()).add(div()).add(div()),
         /* Outer area (four divs) */
         $outer = div().add(div()).add(div()).add(div()),
         /* Handles (empty by default, initialized in setOptions()) */
         $handles = $([]),
 
         /*
          * Additional element to work around a cursor problem in Opera
          * (explained later)
          */
         $areaOpera,
 
         /* Image position (relative to viewport) */
         left, top,
 
         /* Image offset (as returned by .offset()) */
         imgOfs = { left: 0, top: 0 },
 
         /* Image dimensions (as returned by .width() and .height()) */
         imgWidth, imgHeight,
 
         /*
          * jQuery object representing the parent element that the plugin
          * elements are appended to
          */
         $parent,
 
         /* Parent element offset (as returned by .offset()) */
         parOfs = { left: 0, top: 0 },
 
         /* Base z-index for plugin elements */
         zIndex = 0,
 
         /* Plugin elements position */
         position = 'absolute',
 
         /* X/Y coordinates of the starting point for move/resize operations */
         startX, startY,
 
         /* Horizontal and vertical scaling factors */
         scaleX, scaleY,
 
         /* Current resize mode ("nw", "se", etc.) */
         resize,
 
         /* Selection area constraints */
         minWidth, minHeight, maxWidth, maxHeight,
 
         /* Aspect ratio to maintain (floating point number) */
         aspectRatio,
 
         /* Are the plugin elements currently displayed? */
         shown,
 
         /* Current selection (relative to parent element) */
         x1, y1, x2, y2,
 
         /* Current selection (relative to scaled image) */
         selection = { x1: 0, y1: 0, x2: 0, y2: 0, width: 0, height: 0 },
 
         /* Document element */
         docElem = document.documentElement,
 
         /* User agent */
         ua = navigator.userAgent,
 
         /* Various helper variables used throughout the code */
         $p, d, i, o, w, h, adjusted;
 
     /*
      * Translate selection coordinates (relative to scaled image) to viewport
      * coordinates (relative to parent element)
      */
 
     /**
      * Translate selection X to viewport X
      *
      * @param x
      *            Selection X
      * @return Viewport X
      */
     function viewX(x) {
         return x + imgOfs.left - parOfs.left;
     }
 
     /**
      * Translate selection Y to viewport Y
      *
      * @param y
      *            Selection Y
      * @return Viewport Y
      */
     function viewY(y) {
         return y + imgOfs.top - parOfs.top;
     }
 
     /*
      * Translate viewport coordinates to selection coordinates
      */
 
     /**
      * Translate viewport X to selection X
      *
      * @param x
      *            Viewport X
      * @return Selection X
      */
     function selX(x) {
         return x - imgOfs.left + parOfs.left;
     }
 
     /**
      * Translate viewport Y to selection Y
      *
      * @param y
      *            Viewport Y
      * @return Selection Y
      */
     function selY(y) {
         return y - imgOfs.top + parOfs.top;
     }
 
     /*
      * Translate event coordinates (relative to document) to viewport
      * coordinates
      */
 
     /**
      * Get event X and translate it to viewport X
      *
      * @param event
      *            The event object
      * @return Viewport X
      */
     function evX(event) {
         return max(event.pageX || 0, touchCoords(event).x) - parOfs.left;
     }
 
     /**
      * Get event Y and translate it to viewport Y
      *
      * @param event
      *            The event object
      * @return Viewport Y
      */
     function evY(event) {
         return max(event.pageY || 0, touchCoords(event).y) - parOfs.top;
     }
 
     /**
      * Get X and Y coordinates of a touch event
      *
      * @param event
      *            The event object
      * @return Coordinates object
      */
     function touchCoords(event) {
         var oev = event.originalEvent || {};
 
         if (oev.touches && oev.touches.length)
             return { x: oev.touches[0].pageX, y: oev.touches[0].pageY };
         else
             return { x: 0, y: 0 };
     }
 
     /**
      * Get the current selection
      *
      * @param noScale
      *            If set to <code>true</code>, scaling is not applied to the
      *            returned selection
      * @return Selection object
      */
     function getSelection(noScale) {
         var sx = noScale || scaleX, sy = noScale || scaleY;
 
         return { x1: round(selection.x1 * sx),
             y1: round(selection.y1 * sy),
             x2: round(selection.x2 * sx),
             y2: round(selection.y2 * sy),
             width: round(selection.x2 * sx) - round(selection.x1 * sx),
             height: round(selection.y2 * sy) - round(selection.y1 * sy) };
     }
 
     /**
      * Set the current selection
      *
      * @param x1
      *            X coordinate of the upper left corner of the selection area
      * @param y1
      *            Y coordinate of the upper left corner of the selection area
      * @param x2
      *            X coordinate of the lower right corner of the selection area
      * @param y2
      *            Y coordinate of the lower right corner of the selection area
      * @param noScale
      *            If set to <code>true</code>, scaling is not applied to the
      *            new selection
      */
     function setSelection(x1, y1, x2, y2, noScale) {
         var sx = noScale || scaleX, sy = noScale || scaleY;
 
         selection = {
             x1: round(x1 / sx || 0),
             y1: round(y1 / sy || 0),
             x2: round(x2 / sx || 0),
             y2: round(y2 / sy || 0)
         };
 
         selection.width = selection.x2 - selection.x1;
         selection.height = selection.y2 - selection.y1;
     }
 
     /**
      * Recalculate image and parent offsets
      */
     function adjust() {
         /*
          * Do not adjust if image has not yet loaded or if width is not a
          * positive number. The latter might happen when imgAreaSelect is put
          * on a parent element which is then hidden.
          */
         if (!imgLoaded || !$img.width())
             return;
 
         /*
          * Get image offset. The .offset() method returns float values, so they
          * need to be rounded.
          */
         imgOfs = { left: round($img.offset().left), top: round($img.offset().top) };
 
         /* Get image dimensions */
         imgWidth = $img.innerWidth();
         imgHeight = $img.innerHeight();
 
         imgOfs.top += ($img.outerHeight() - imgHeight) >> 1;
         imgOfs.left += ($img.outerWidth() - imgWidth) >> 1;
 
         /* Set minimum and maximum selection area dimensions */
         minWidth = round(options.minWidth / scaleX) || 0;
         minHeight = round(options.minHeight / scaleY) || 0;
         maxWidth = round(min(options.maxWidth / scaleX || 1<<24, imgWidth));
         maxHeight = round(min(options.maxHeight / scaleY || 1<<24, imgHeight));
 
         /*
          * Workaround for jQuery 1.3.2 incorrect offset calculation, originally
          * observed in Safari 3. Firefox 2 is also affected.
          */
         if ($().jquery == '1.3.2' && position == 'fixed' &&
             !docElem['getBoundingClientRect'])
         {
             imgOfs.top += max(document.body.scrollTop, docElem.scrollTop);
             imgOfs.left += max(document.body.scrollLeft, docElem.scrollLeft);
         }
 
         /* Determine parent element offset */
         parOfs = /absolute|relative/.test($parent.css('position')) ?
             { left: round($parent.offset().left) - $parent.scrollLeft(),
                 top: round($parent.offset().top) - $parent.scrollTop() } :
             position == 'fixed' ?
                 { left: $(document).scrollLeft(), top: $(document).scrollTop() } :
                 { left: 0, top: 0 };
 
         left = viewX(0);
         top = viewY(0);
 
         /*
          * Check if selection area is within image boundaries, adjust if
          * necessary
          */
         if (selection.x2 > imgWidth || selection.y2 > imgHeight)
             doResize();
     }
 
     /**
      * Update plugin elements
      *
      * @param resetKeyPress
      *            If set to <code>false</code>, this instance's keypress
      *            event handler is not activated
      */
     function update(resetKeyPress) {
         /* If plugin elements are hidden, do nothing */
         if (!shown) return;
 
         /*
          * Set the position and size of the container box and the selection area
          * inside it
          */
         $box.css({ left: viewX(selection.x1), top: viewY(selection.y1) })
             .add($area).width(w = selection.width).height(h = selection.height);
 
         /*
          * Reset the position of selection area, borders, and handles (IE6/IE7
          * position them incorrectly if we don't do this)
          */
         $area.add($border).add($handles).css({ left: 0, top: 0 });
 
         /* Set border dimensions */
         $border
             .width(max(w - $border.outerWidth() + $border.innerWidth(), 0))
             .height(max(h - $border.outerHeight() + $border.innerHeight(), 0));
 
         /* Arrange the outer area elements */
         $($outer[0]).css({ left: left, top: top,
             width: selection.x1, height: imgHeight });
         $($outer[1]).css({ left: left + selection.x1, top: top,
             width: w, height: selection.y1 });
         $($outer[2]).css({ left: left + selection.x2, top: top,
             width: imgWidth - selection.x2, height: imgHeight });
         $($outer[3]).css({ left: left + selection.x1, top: top + selection.y2,
             width: w, height: imgHeight - selection.y2 });
 
         w -= $handles.outerWidth();
         h -= $handles.outerHeight();
 
         /* Arrange handles */
         switch ($handles.length) {
         case 8:
             $($handles[4]).css({ left: w >> 1 });
             $($handles[5]).css({ left: w, top: h >> 1 });
             $($handles[6]).css({ left: w >> 1, top: h });
             $($handles[7]).css({ top: h >> 1 });
         case 4:
             $handles.slice(1,3).css({ left: w });
             $handles.slice(2,4).css({ top: h });
         }
 
         if (resetKeyPress !== false) {
             /*
              * Need to reset the document keypress event handler -- unbind the
              * current handler
              */
             if ($.imgAreaSelect.onKeyPress != docKeyPress)
                 $(document).off($.imgAreaSelect.keyPress,
                     $.imgAreaSelect.onKeyPress);
 
             if (options.keys)
                 /*
                  * Set the document keypress event handler to this instance's
                  * docKeyPress() function
                  */
                 $(document).on( $.imgAreaSelect.keyPress, function() {
                     $.imgAreaSelect.onKeyPress = docKeyPress;
                 });
         }
 
         /*
          * Internet Explorer displays 1px-wide dashed borders incorrectly by
          * filling the spaces between dashes with white. Toggling the margin
          * property between 0 and "auto" fixes this in IE6 and IE7 (IE8 is still
          * broken). This workaround is not perfect, as it requires setTimeout()
          * and thus causes the border to flicker a bit, but I haven't found a
          * better solution.
          *
          * Note: This only happens with CSS borders, set with the borderWidth,
          * borderOpacity, borderColor1, and borderColor2 options (which are now
          * deprecated). Borders created with GIF background images are fine.
          */
         if (msie && $border.outerWidth() - $border.innerWidth() == 2) {
             $border.css('margin', 0);
             setTimeout(function () { $border.css('margin', 'auto'); }, 0);
         }
     }
 
     /**
      * Do the complete update sequence: recalculate offsets, update the
      * elements, and set the correct values of x1, y1, x2, and y2.
      *
      * @param resetKeyPress
      *            If set to <code>false</code>, this instance's keypress
      *            event handler is not activated
      */
     function doUpdate(resetKeyPress) {
         adjust();
         update(resetKeyPress);
         x1 = viewX(selection.x1); y1 = viewY(selection.y1);
         x2 = viewX(selection.x2); y2 = viewY(selection.y2);
     }
 
     /**
      * Hide or fade out an element (or multiple elements)
      *
      * @param $elem
      *            A jQuery object containing the element(s) to hide/fade out
      * @param fn
      *            Callback function to be called when fadeOut() completes
      */
     function hide($elem, fn) {
         options.fadeSpeed ? $elem.fadeOut(options.fadeSpeed, fn) : $elem.hide();
     }
 
     /**
      * Selection area mousemove event handler
      *
      * @param event
      *            The event object
      */
     function areaMouseMove(event) {
         var x = selX(evX(event)) - selection.x1,
             y = selY(evY(event)) - selection.y1;
 
         if (!adjusted) {
             adjust();
             adjusted = true;
 
             $box.one('mouseout', function () { adjusted = false; });
         }
 
         /* Clear the resize mode */
         resize = '';
 
         if (options.resizable) {
             /*
              * Check if the mouse pointer is over the resize margin area and set
              * the resize mode accordingly
              */
             if (y <= options.resizeMargin)
                 resize = 'n';
             else if (y >= selection.height - options.resizeMargin)
                 resize = 's';
             if (x <= options.resizeMargin)
                 resize += 'w';
             else if (x >= selection.width - options.resizeMargin)
                 resize += 'e';
         }
 
         $box.css('cursor', resize ? resize + '-resize' :
             options.movable ? 'move' : '');
         if ($areaOpera)
             $areaOpera.toggle();
     }
 
     /**
      * Document mouseup event handler
      *
      * @param event
      *            The event object
      */
     function docMouseUp(event) {
         /* Set back the default cursor */
         $('body').css('cursor', '');
         /*
          * If autoHide is enabled, or if the selection has zero width/height,
          * hide the selection and the outer area
          */
         if (options.autoHide || selection.width * selection.height == 0)
             hide($box.add($outer), function () { $(this).hide(); });
 
         $(document).off('mousemove touchmove', selectingMouseMove);
         $box.on('mousemove touchmove', areaMouseMove);
 
         options.onSelectEnd(img, getSelection());
     }
 
     /**
      * Selection area mousedown event handler
      *
      * @param event
      *            The event object
      * @return false
      */
     function areaMouseDown(event) {
         if (event.type == 'mousedown' && event.which != 1) return false;
 
     	/*
     	 * With mobile browsers, there is no "moving the pointer over" action,
     	 * so we need to simulate one mousemove event happening prior to
     	 * mousedown/touchstart.
     	 */
     	areaMouseMove(event);
 
         adjust();
 
         if (resize) {
             /* Resize mode is in effect */
             $('body').css('cursor', resize + '-resize');
 
             x1 = viewX(selection[/w/.test(resize) ? 'x2' : 'x1']);
             y1 = viewY(selection[/n/.test(resize) ? 'y2' : 'y1']);
 
             $(document).on('mousemove touchmove', selectingMouseMove)
                 .one('mouseup touchend', docMouseUp);
             $box.off('mousemove touchmove', areaMouseMove);
         }
         else if (options.movable) {
             startX = left + selection.x1 - evX(event);
             startY = top + selection.y1 - evY(event);
 
             $box.off('mousemove touchmove', areaMouseMove);
 
             $(document).on('mousemove touchmove', movingMouseMove)
                 .one('mouseup touchend', function () {
                     options.onSelectEnd(img, getSelection());
 
                     $(document).off('mousemove touchmove', movingMouseMove);
                     $box.on('mousemove touchmove', areaMouseMove);
                 });
         }
         else
             $img.mousedown(event);
 
         return false;
     }
 
     /**
      * Adjust the x2/y2 coordinates to maintain aspect ratio (if defined)
      *
      * @param xFirst
      *            If set to <code>true</code>, calculate x2 first. Otherwise,
      *            calculate y2 first.
      */
     function fixAspectRatio(xFirst) {
         if (aspectRatio)
             if (xFirst) {
                 x2 = max(left, min(left + imgWidth,
                     x1 + abs(y2 - y1) * aspectRatio * (x2 > x1 || -1)));
                 y2 = round(max(top, min(top + imgHeight,
                     y1 + abs(x2 - x1) / aspectRatio * (y2 > y1 || -1))));
                 x2 = round(x2);
             }
             else {
                 y2 = max(top, min(top + imgHeight,
                     y1 + abs(x2 - x1) / aspectRatio * (y2 > y1 || -1)));
                 x2 = round(max(left, min(left + imgWidth,
                     x1 + abs(y2 - y1) * aspectRatio * (x2 > x1 || -1))));
                 y2 = round(y2);
             }
     }
 
     /**
      * Resize the selection area respecting the minimum/maximum dimensions and
      * aspect ratio
      */
     function doResize() {
         /*
          * Make sure the top left corner of the selection area stays within
          * image boundaries (it might not if the image source was dynamically
          * changed).
          */
         x1 = min(x1, left + imgWidth);
         y1 = min(y1, top + imgHeight);
 
         if (abs(x2 - x1) < minWidth) {
             /* Selection width is smaller than minWidth */
             x2 = x1 - minWidth * (x2 < x1 || -1);
 
             if (x2 < left)
                 x1 = left + minWidth;
             else if (x2 > left + imgWidth)
                 x1 = left + imgWidth - minWidth;
         }
 
         if (abs(y2 - y1) < minHeight) {
             /* Selection height is smaller than minHeight */
             y2 = y1 - minHeight * (y2 < y1 || -1);
 
             if (y2 < top)
                 y1 = top + minHeight;
             else if (y2 > top + imgHeight)
                 y1 = top + imgHeight - minHeight;
         }
 
         x2 = max(left, min(x2, left + imgWidth));
         y2 = max(top, min(y2, top + imgHeight));
 
         fixAspectRatio(abs(x2 - x1) < abs(y2 - y1) * aspectRatio);
 
         if (abs(x2 - x1) > maxWidth) {
             /* Selection width is greater than maxWidth */
             x2 = x1 - maxWidth * (x2 < x1 || -1);
             fixAspectRatio();
         }
 
         if (abs(y2 - y1) > maxHeight) {
             /* Selection height is greater than maxHeight */
             y2 = y1 - maxHeight * (y2 < y1 || -1);
             fixAspectRatio(true);
         }
 
         selection = { x1: selX(min(x1, x2)), x2: selX(max(x1, x2)),
             y1: selY(min(y1, y2)), y2: selY(max(y1, y2)),
             width: abs(x2 - x1), height: abs(y2 - y1) };
 
         update();
 
         options.onSelectChange(img, getSelection());
     }
 
     /**
      * Mousemove event handler triggered when the user is selecting an area
      *
      * @param event
      *            The event object
      * @return false
      */
     function selectingMouseMove(event) {
         x2 = /w|e|^$/.test(resize) || aspectRatio ? evX(event) : viewX(selection.x2);
         y2 = /n|s|^$/.test(resize) || aspectRatio ? evY(event) : viewY(selection.y2);
 
         doResize();
 
         return false;
     }
 
     /**
      * Move the selection area
      *
      * @param newX1
      *            New viewport X1
      * @param newY1
      *            New viewport Y1
      */
     function doMove(newX1, newY1) {
         x2 = (x1 = newX1) + selection.width;
         y2 = (y1 = newY1) + selection.height;
 
         $.extend(selection, { x1: selX(x1), y1: selY(y1), x2: selX(x2),
             y2: selY(y2) });
 
         update();
 
         options.onSelectChange(img, getSelection());
     }
 
     /**
      * Mousemove event handler triggered when the selection area is being moved
      *
      * @param event
      *            The event object
      * @return false
      */
     function movingMouseMove(event) {
         x1 = max(left, min(startX + evX(event), left + imgWidth - selection.width));
         y1 = max(top, min(startY + evY(event), top + imgHeight - selection.height));
 
         doMove(x1, y1);
 
         event.preventDefault();
         return false;
     }
 
     /**
      * Start selection
      */
     function startSelection() {
         $(document).off('mousemove touchmove', startSelection);
         adjust();
 
         x2 = x1;
         y2 = y1;
         doResize();
 
         resize = '';
 
         if (!$outer.is(':visible'))
             /* Show the plugin elements */
             $box.add($outer).hide().fadeIn(options.fadeSpeed||0);
 
         shown = true;
 
         $(document).off('mouseup touchend', cancelSelection)
             .on('mousemove touchmove', selectingMouseMove)
             .one('mouseup touchend', docMouseUp);
         $box.off('mousemove touchmove', areaMouseMove);
 
         options.onSelectStart(img, getSelection());
     }
 
     /**
      * Cancel selection
      */
     function cancelSelection() {
         $(document).off('mousemove touchmove', startSelection)
             .off('mouseup touchend', cancelSelection);
         hide($box.add($outer));
 
         setSelection(selX(x1), selY(y1), selX(x1), selY(y1));
 
         /* If this is an API call, callback functions should not be triggered */
         if (!(this instanceof $.imgAreaSelect)) {
             options.onSelectChange(img, getSelection());
             options.onSelectEnd(img, getSelection());
         }
     }
 
     /**
      * Image mousedown event handler
      *
      * @param event
      *            The event object
      * @return false
      */
     function imgMouseDown(event) {
         /* Ignore the event if animation is in progress */
         if (event.which > 1 || $outer.is(':animated')) return false;
 
         adjust();
         startX = x1 = evX(event);
         startY = y1 = evY(event);
 
         /* Selection will start when the mouse is moved */
         $(document).on({ 'mousemove touchmove': startSelection,
             'mouseup touchend': cancelSelection });
 
         return false;
     }
 
     /**
      * Window resize event handler
      */
     function windowResize() {
         doUpdate(false);
     }
 
     /**
      * Image load event handler. This is the final part of the initialization
      * process.
      */
     function imgLoad() {
         imgLoaded = true;
 
         /* Set options */
         setOptions(options = $.extend({
             classPrefix: 'imgareaselect',
             movable: true,
             parent: 'body',
             resizable: true,
             resizeMargin: 10,
             onInit: function () {},
             onSelectStart: function () {},
             onSelectChange: function () {},
             onSelectEnd: function () {}
         }, options));
 
         $box.add($outer).css({ visibility: '' });
 
         if (options.show) {
             shown = true;
             adjust();
             update();
             $box.add($outer).hide().fadeIn(options.fadeSpeed||0);
         }
 
         /*
          * Call the onInit callback. The setTimeout() call is used to ensure
          * that the plugin has been fully initialized and the object instance is
          * available (so that it can be obtained in the callback).
          */
         setTimeout(function () { options.onInit(img, getSelection()); }, 0);
     }
 
     /**
      * Document keypress event handler
      *
      * @param event
      *            The event object
      * @return false
      */
     var docKeyPress = function(event) {
         var k = options.keys, d, t, key = event.keyCode;
 
         d = !isNaN(k.alt) && (event.altKey || event.originalEvent.altKey) ? k.alt :
             !isNaN(k.ctrl) && event.ctrlKey ? k.ctrl :
             !isNaN(k.shift) && event.shiftKey ? k.shift :
             !isNaN(k.arrows) ? k.arrows : 10;
 
         if (k.arrows == 'resize' || (k.shift == 'resize' && event.shiftKey) ||
             (k.ctrl == 'resize' && event.ctrlKey) ||
             (k.alt == 'resize' && (event.altKey || event.originalEvent.altKey)))
         {
             /* Resize selection */
 
             switch (key) {
             case 37:
                 /* Left */
                 d = -d;
             case 39:
                 /* Right */
                 t = max(x1, x2);
                 x1 = min(x1, x2);
                 x2 = max(t + d, x1);
                 fixAspectRatio();
                 break;
             case 38:
                 /* Up */
                 d = -d;
             case 40:
                 /* Down */
                 t = max(y1, y2);
                 y1 = min(y1, y2);
                 y2 = max(t + d, y1);
                 fixAspectRatio(true);
                 break;
             default:
                 return;
             }
 
             doResize();
         }
         else {
             /* Move selection */
 
             x1 = min(x1, x2);
             y1 = min(y1, y2);
 
             switch (key) {
             case 37:
                 /* Left */
                 doMove(max(x1 - d, left), y1);
                 break;
             case 38:
                 /* Up */
                 doMove(x1, max(y1 - d, top));
                 break;
             case 39:
                 /* Right */
                 doMove(x1 + min(d, imgWidth - selX(x2)), y1);
                 break;
             case 40:
                 /* Down */
                 doMove(x1, y1 + min(d, imgHeight - selY(y2)));
                 break;
             default:
                 return;
             }
         }
 
         return false;
     };
 
     /**
      * Apply style options to plugin element (or multiple elements)
      *
      * @param $elem
      *            A jQuery object representing the element(s) to style
      * @param props
      *            An object that maps option names to corresponding CSS
      *            properties
      */
     function styleOptions($elem, props) {
         for (var option in props)
             if (options[option] !== undefined)
                 $elem.css(props[option], options[option]);
     }
 
     /**
      * Set plugin options
      *
      * @param newOptions
      *            The new options object
      */
     function setOptions(newOptions) {
         if (newOptions.parent)
             ($parent = $(newOptions.parent)).append($box.add($outer));
 
         /* Merge the new options with the existing ones */
         $.extend(options, newOptions);
 
         adjust();
 
         if (newOptions.handles != null) {
             /* Recreate selection area handles */
             $handles.remove();
             $handles = $([]);
 
             i = newOptions.handles ? newOptions.handles == 'corners' ? 4 : 8 : 0;
 
             while (i--)
                 $handles = $handles.add(div());
 
             /* Add a class to handles and set the CSS properties */
             $handles.addClass(options.classPrefix + '-handle').css({
                 position: 'absolute',
                 /*
                  * The font-size property needs to be set to zero, otherwise
                  * Internet Explorer makes the handles too large
                  */
                 fontSize: '0',
                 zIndex: zIndex + 1 || 1
             });
 
             /*
              * If handle width/height has not been set with CSS rules, set the
              * default 5px
              */
             if (!parseInt($handles.css('width')) >= 0)
                 $handles.width(5).height(5);
 
             /*
              * If the borderWidth option is in use, add a solid border to
              * handles
              */
             if (o = options.borderWidth)
                 $handles.css({ borderWidth: o, borderStyle: 'solid' });
 
             /* Apply other style options */
             styleOptions($handles, { borderColor1: 'border-color',
                 borderColor2: 'background-color',
                 borderOpacity: 'opacity' });
         }
 
         /* Calculate scale factors */
         scaleX = options.imageWidth / imgWidth || 1;
         scaleY = options.imageHeight / imgHeight || 1;
 
         /* Set selection */
         if (newOptions.x1 != null) {
             setSelection(newOptions.x1, newOptions.y1, newOptions.x2,
                 newOptions.y2);
             newOptions.show = !newOptions.hide;
         }
 
         if (newOptions.keys)
             /* Enable keyboard support */
             options.keys = $.extend({ shift: 1, ctrl: 'resize' },
                 newOptions.keys);
 
         /* Add classes to plugin elements */
         $outer.addClass(options.classPrefix + '-outer');
         $area.addClass(options.classPrefix + '-selection');
         for (i = 0; i++ < 4;)
             $($border[i-1]).addClass(options.classPrefix + '-border' + i);
 
         /* Apply style options */
         styleOptions($area, { selectionColor: 'background-color',
             selectionOpacity: 'opacity' });
         styleOptions($border, { borderOpacity: 'opacity',
             borderWidth: 'border-width' });
         styleOptions($outer, { outerColor: 'background-color',
             outerOpacity: 'opacity' });
         if (o = options.borderColor1)
             $($border[0]).css({ borderStyle: 'solid', borderColor: o });
         if (o = options.borderColor2)
             $($border[1]).css({ borderStyle: 'dashed', borderColor: o });
 
         /* Append all the selection area elements to the container box */
         $box.append($area.add($border).add($areaOpera)).append($handles);
 
         if (msie) {
             if (o = ($outer.css('filter')||'').match(/opacity=(\d+)/))
                 $outer.css('opacity', o[1]/100);
             if (o = ($border.css('filter')||'').match(/opacity=(\d+)/))
                 $border.css('opacity', o[1]/100);
         }
 
         if (newOptions.hide)
             hide($box.add($outer));
         else if (newOptions.show && imgLoaded) {
             shown = true;
             $box.add($outer).fadeIn(options.fadeSpeed||0);
             doUpdate();
         }
 
         /* Calculate the aspect ratio factor */
         aspectRatio = (d = (options.aspectRatio || '').split(/:/))[0] / d[1];
 
         $img.add($outer).off('mousedown', imgMouseDown);
 
         if (options.disable || options.enable === false) {
             /* Disable the plugin */
             $box.off({ 'mousemove touchmove': areaMouseMove,
                 'mousedown touchstart': areaMouseDown });
             $(window).off('resize', windowResize);
         }
         else {
             if (options.enable || options.disable === false) {
                 /* Enable the plugin */
                 if (options.resizable || options.movable)
                     $box.on({ 'mousemove touchmove': areaMouseMove,
                         'mousedown touchstart': areaMouseDown });
 
                 $(window).on( 'resize', windowResize);
             }
 
             if (!options.persistent)
                 $img.add($outer).on('mousedown touchstart', imgMouseDown);
         }
 
         options.enable = options.disable = undefined;
     }
 
     /**
      * Remove plugin completely
      */
     this.remove = function () {
         /*
          * Call setOptions with { disable: true } to unbind the event handlers
          */
         setOptions({ disable: true });
         $box.add($outer).remove();
     };
 
     /*
      * Public API
      */
 
     /**
      * Get current options
      *
      * @return An object containing the set of options currently in use
      */
     this.getOptions = function () { return options; };
 
     /**
      * Set plugin options
      *
      * @param newOptions
      *            The new options object
      */
     this.setOptions = setOptions;
 
     /**
      * Get the current selection
      *
      * @param noScale
      *            If set to <code>true</code>, scaling is not applied to the
      *            returned selection
      * @return Selection object
      */
     this.getSelection = getSelection;
 
     /**
      * Set the current selection
      *
      * @param x1
      *            X coordinate of the upper left corner of the selection area
      * @param y1
      *            Y coordinate of the upper left corner of the selection area
      * @param x2
      *            X coordinate of the lower right corner of the selection area
      * @param y2
      *            Y coordinate of the lower right corner of the selection area
      * @param noScale
      *            If set to <code>true</code>, scaling is not applied to the
      *            new selection
      */
     this.setSelection = setSelection;
 
     /**
      * Cancel selection
      */
     this.cancelSelection = cancelSelection;
 
     /**
      * Update plugin elements
      *
      * @param resetKeyPress
      *            If set to <code>false</code>, this instance's keypress
      *            event handler is not activated
      */
     this.update = doUpdate;
 
     /* Do the dreaded browser detection */
     var msie = (/msie ([\w.]+)/i.exec(ua)||[])[1],
         opera = /opera/i.test(ua),
         safari = /webkit/i.test(ua) && !/chrome/i.test(ua);
 
     /*
      * Traverse the image's parent elements (up to <body>) and find the
      * highest z-index
      */
     $p = $img;
 
     while ($p.length) {
         zIndex = max(zIndex,
             !isNaN($p.css('z-index')) ? $p.css('z-index') : zIndex);
         /* Also check if any of the ancestor elements has fixed position */
         if ($p.css('position') == 'fixed')
             position = 'fixed';
 
         $p = $p.parent(':not(body)');
     }
 
     /*
      * If z-index is given as an option, it overrides the one found by the
      * above loop
      */
     zIndex = options.zIndex || zIndex;
 
     if (msie)
         $img.attr('unselectable', 'on');
 
     /*
      * In MSIE and WebKit, we need to use the keydown event instead of keypress
      */
     $.imgAreaSelect.keyPress = msie || safari ? 'keydown' : 'keypress';
 
     /*
      * There is a bug affecting the CSS cursor property in Opera (observed in
      * versions up to 10.00) that prevents the cursor from being updated unless
      * the mouse leaves and enters the element again. To trigger the mouseover
      * event, we're adding an additional div to $box and we're going to toggle
      * it when mouse moves inside the selection area.
      */
     if (opera)
         $areaOpera = div().css({ width: '100%', height: '100%',
             position: 'absolute', zIndex: zIndex + 2 || 2 });
 
     /*
      * We initially set visibility to "hidden" as a workaround for a weird
      * behaviour observed in Google Chrome 1.0.154.53 (on Windows XP). Normally
      * we would just set display to "none", but, for some reason, if we do so
      * then Chrome refuses to later display the element with .show() or
      * .fadeIn().
      */
     $box.add($outer).css({ visibility: 'hidden', position: position,
         overflow: 'hidden', zIndex: zIndex || '0' });
     $box.css({ zIndex: zIndex + 2 || 2 });
     $area.add($border).css({ position: 'absolute', fontSize: '0' });
 
     /*
      * If the image has been fully loaded, or if it is not really an image (eg.
      * a div), call imgLoad() immediately; otherwise, bind it to be called once
      * on image load event.
      */
     img.complete || img.readyState == 'complete' || !$img.is('img') ?
         imgLoad() : $img.one('load', imgLoad);
 
     /*
      * MSIE 9.0 doesn't always fire the image load event -- resetting the src
      * attribute seems to trigger it. The check is for version 7 and above to
      * accommodate for MSIE 9 running in compatibility mode.
      */
     if (!imgLoaded && msie && msie >= 7)
         img.src = img.src;
 };
 
 /**
  * Invoke imgAreaSelect on a jQuery object containing the image(s)
  *
  * @param options
  *            Options object
  * @return The jQuery object or a reference to imgAreaSelect instance (if the
  *         <code>instance</code> option was specified)
  */
 $.fn.imgAreaSelect = function (options) {
     options = options || {};
 
     this.each(function () {
         /* Is there already an imgAreaSelect instance bound to this element? */
         if ($(this).data('imgAreaSelect')) {
             /* Yes there is -- is it supposed to be removed? */
             if (options.remove) {
                 /* Remove the plugin */
                 $(this).data('imgAreaSelect').remove();
                 $(this).removeData('imgAreaSelect');
             }
             else
                 /* Reset options */
                 $(this).data('imgAreaSelect').setOptions(options);
         }
         else if (!options.remove) {
             /* No exising instance -- create a new one */
 
             /*
              * If neither the "enable" nor the "disable" option is present, add
              * "enable" as the default
              */
             if (options.enable === undefined && options.disable === undefined)
                 options.enable = true;
 
             $(this).data('imgAreaSelect', new $.imgAreaSelect(this, options));
         }
     });
 
     if (options.instance)
         /*
          * Return the imgAreaSelect instance bound to the first element in the
          * set
          */
         return $(this).data('imgAreaSelect');
 
     return this;
 };
 
 })(jQuery);