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Image Map Fixer

Finds image maps where the image fails to load and add colored blocks to make them more visible. Only supports RECT areas for now.

29.12.2015 itibariyledir. En son verisyonu görün.

// ==UserScript==
// @name          Image Map Fixer
// @namespace     DoomTay
// @description   Finds image maps where the image fails to load and add colored blocks to make them more visible. Only supports RECT areas for now.
// @version       0.9.0
// @grant         GM_xmlhttpRequest

// ==/UserScript==

var pics = document.body.querySelectorAll("img[usemap]");

for(var i = 0; i < pics.length; i++)
{
	evaluateImage(pics[i]);
}

function evaluateImage(pic)
{
	GM_xmlhttpRequest({
		url: pic.src,
		method: "HEAD",
		onload: function(response) {
			//Going off of response code is unreliable. Sometimes an image will return a status code of 200 even though it would redirect to an error page should you view the image directly, so we're looking at content type instead
			if(response.responseHeaders.indexOf("Content-Type: text/html") > -1)
			{
				var picOffset = {x:pic.getBoundingClientRect().x, y: pic.getBoundingClientRect().y};
				var map = document.body.querySelector("[name = " + pic.getAttribute("usemap").substring(1) + "]");
				for(a = 0; a < map.areas.length; a++)
				{
					switch(map.areas[a].getAttribute("shape"))
					{
						case "rect":
						case "RECT":
							var parsedCoords = /(\d+),\s?(\d+),\s?(\d+),\s?(\d+)/.exec(map.areas[a].getAttribute("coords"));
							var coords = {x: parseInt(parsedCoords[1]), y: parseInt(parsedCoords[2])};
							coords.width = parseInt(parsedCoords[3]) - coords.x;
							coords.height = parseInt(parsedCoords[4]) - coords.y;
							var areaLink = document.createElement("A");
							areaLink.href = map.areas[a].href;
							areaLink.style.position = "absolute";
							areaLink.style.left = picOffset.x + coords.x + "px";
							areaLink.style.top = picOffset.y + coords.y + "px";
							areaLink.style.backgroundColor = randomColor();
							areaLink.style.width = coords.width + "px";
							areaLink.style.height = coords.height + "px";
							break;
						case "circle":
						case "CIRCLE":
							var parsedCoords = /(\d+),\s?(\d+),\s?(\d+)/.exec(map.areas[a].getAttribute("coords"));
							var coords = {x: parseInt(parsedCoords[1]), y: parseInt(parsedCoords[2])};
							coords.radius = parseInt(parsedCoords[3]);
							var areaLink = document.createElement("A");
							areaLink.href = map.areas[a].href;
							areaLink.style.position = "absolute";
							areaLink.style.left = (picOffset.x + coords.x - coords.radius) + "px";
							areaLink.style.top = (picOffset.y + coords.y - coords.radius) + "px";
							areaLink.style.backgroundColor = randomColor();
							areaLink.style.width = areaLink.style.height = (coords.radius * 2) + "px";
							areaLink.style.borderRadius = coords.radius + "px";
							break;
						default:
							break;
					}
					areaLink.style.color = "white";
					areaLink.style.overflow = "auto";
					pic.parentNode.insertBefore(areaLink, pic.nextSibling);
					
				}
			}
		}
	});
}

function randomColor() {
	var color = "rgb("
	var colorValues = [];
	for(var c = 0; c < 3; c++)
	{
		colorValues.push(Math.floor(Math.random()*256));
	}
	color += colorValues + ")";
	return color;
}