$(document).ready(function() {
var
//add this class to all elements created by the script. the reason is that we call the script again on
//window resize, and use the class to remove all the "artefacts" we created in the previous run.
myClassName = 'imageMapHighlighterArtefacts'
, liHighlightClass = 'liHighlighting'
// "2d context" attributes used for highlighting.
, areaHighLighting = {fillStyle: 'rgba(0,0,0,0.30)', strokeStyle: 'yellow', lineJoin: 'round', lineWidth: 1.6}
//every imagemap that wants highlighting, should reside in a div of this 'class':
, hilightDivMarker = '.imageMapHighlighter'
// specifically for wikis - redlinks tooltip adds this message
, el = mw && mw.config && mw.config.get('wgUserLanguage') == 'el'
, pageDoesntExistMessage = el ? ' (Η σελίδα δεν υπάρχει)' : ' (page does not exist)'
, expandLegend = el ? 'Εμφάνιση λίστας χάρτη' : 'ּShow Legend'
, collapseLegend = el ? 'Απόκρυψη λίστας χάρτη' : 'Hide Legend'
;
function drawMarker(context, areas) { // this is where the magic is done.
function drawPoly(coords) {
context.moveTo(coords.shift(), coords.shift());
while (coords.length)
context.lineTo(coords.shift(), coords.shift());
}
for (var i in areas) {
var coords = areas[i].coords.split(',');
context.beginPath();
switch (areas[i].shape) {
case 'rect': drawPoly([coords[0], coords[1], coords[0], coords[3], coords[2], coords[3], coords[2], coords[1]]); break;
case 'circle': context.arc(coords[0],coords[1],coords[2],0,Math.PI*2); break;//x,y,r,startAngle,endAngle
case 'poly': drawPoly(coords); break;
}
context.closePath();
context.stroke();
context.fill();
}
}
function mouseAction(e) {
var $this = $(this),
context = $this.data('context'),
activate = e.type == 'mouseover',
li = $this.prop('tagName') == 'LI';
if (li && activate) { // in this case, we need to test visibility vis a vis scrolling
var height = $this.height(),
ol = $this.parent(),
top = $this.position().top;
if (top < 0 || top + height > ol.height())
ol.animate({scrollTop: ol.scrollTop() + top - ol.height() / 2});
}
$this.toggleClass(liHighlightClass, activate);
context.clearRect(0, 0, context.canvas.width, context.canvas.height);
if (activate) {
drawMarker(context, $this.data('areas'));
if ($.client.profile().name === 'msie') { // ie9: dimwit needs to be told twice.
context.clearRect(0, 0, context.canvas.width, context.canvas.height);
drawMarker(context, $this.data('areas'));
}
}
}
// massage the area "href" and create a human legible string to be used as the tooltip of "li"
function pageOfHref(href, cssClass) {
var page = href.replace(document.location.protocol + mw.config.get('wgServer') + "/wiki/", '').replace(/.*\/\//, '').replace(/_/g, ' ');
page = page.replace(/#(.*)/, function(toReplace){return toReplace.replace(/\.([\dA-F]{2})/g, '%$1');});
page = decodeURIComponent(page); // used for "title" of legends - just like "normal" wiki links.
if (cssClass.indexOf('new') + 1)
page += pageDoesntExistMessage;
return page;
}
function init() {
appendCSS('li.' + myClassName + '{white-space:normal;}\n' + //css for li element
'li.' + liHighlightClass + '{background-color:yellow;}\n' + //css for highlighted li element.
'.rtl li.' + myClassName + '{ margin-left: 3em;}\n' +
'.ltr li.' + myClassName + '{ margin-right: 3em;}');
var imgindex = 0;
$(hilightDivMarker+ ' img').each(function() {
var img = $(this), map = img.siblings('map:first');
if (!('area', map).length)
return; //not an imagemap. inside "each" anonymous function, 'return' means "continue".
var w = img.width(), h = img.height();
var dims = {position: 'absolute', width: w + 'px', height: h + 'px', border: 0, top:0, left:0};
var jcanvas = $('<canvas>', {'class': myClassName})
.css(dims)
.attr({width: w, height: h});
var bgimg = $('<img>', {'class': myClassName, src: img.attr('src')})
.css(dims);//completely inert image. this is what we see.
var context = $.extend(jcanvas[0].getContext("2d"), areaHighLighting);
// this is where the magic is done: prepare a sandwich of the inert bgimg at the bottom,
// the canvas above it, and the original, image, on top.
// so canvas won't steal the mouse events.
// pack them all TIGHTLY in a newly minted "relative" div, so when page chnage
// (other scripts adding elements, window resize etc.), canvas and imagese remain aligned.
var div = $('<div>').css({position: 'relative', width: w + 'px', height: h + 'px'});
img.before(div); // put the div just above the image, and ...
div.append(bgimg) // place the background image in the div
.append(jcanvas)// and the canvas. both are "absolute", so they don't occupy space in the div
.append(img); // now yank the original image from the window and place it on top.
img.fadeTo(1, 0); // make the image transparent - we see canvas and bgimg through it.
var eL = $(".imageMapHighlighter:eq(" + imgindex + ")").attr("data-expandLegendText");
if (eL !== undefined) { expandLegend = eL; }
var cL = $(".imageMapHighlighter:eq(" + imgindex + ")").attr("data-collapseLegendText");
if (cL !== undefined) { collapseLegend = cL; }
var ol = $('<ol>', {'class': myClassName})
.css({clear: 'both', margin: 0, left: 20, 'text-align': 'left', listStyle: 'disc', maxWidth: w + 'px', float: 'left', position: 'relative'})
.attr({'data-expandtext' : expandLegend, 'data-collapsetext': collapseLegend});
// ol below image, hr below ol. original caption pushed below hr.
var sl = $(".imageMapHighlighter:eq(" + imgindex + ")").attr("data-showLegend");
if (sl === undefined) { sl = "no"; }
if ( sl.search("yes") === 0 ) {
div.after($('<hr>', {'class': myClassName}).css('clear', 'both')).after(ol);
}
imgindex++;
var lis = {}; //collapse areas with same caption to one list item
$('area', map).each(function() {
var $this = $(this), text = this.title;
var li = lis[text]; // title already met? use the same li
if (!li) { //no? create a new one.
var href = this.href, cssClass = this['class'] || '';
lis[text] = li = $('<li>', {'class': myClassName})
.append($('<a>', {href: href, title: pageOfHref(href, cssClass), text: text, 'class': cssClass + ' internal'}))
.bind('mouseover mouseout', mouseAction)
.data('areas', [])
.data('context', context)
.appendTo(ol);
}
li.data('areas').push(this); //add the area to the li
$(this).bind('mouseover mouseout', function(e) {li.trigger(e);});
});
ol.addClass('mw-collapsed')
.makeCollapsible();
});
}
//has at least one "imagehighlight" div, and canvas-capable browser:
if ($(hilightDivMarker).length && $('<canvas>')[0].getContext) {
mw.loader.using('jquery.makeCollapsible', init);
}
});
