[Archive-access-cvs] SF.net SVN: archive-access:[3062] trunk/archive-access/projects/wayback/ wayback-webapp/src/main/webapp/js/graph-calc.js

[<bra...@us...>]

Revision: 3062
          http://archive-access.svn.sourceforge.net/archive-access/?rev=3062&view=rev
Author:   bradtofel
Date:     2010-04-24 00:42:27 +0000 (Sat, 24 Apr 2010)

Log Message:
-----------
INITIAL REV: Code to translate a mouse horizontal location within an image, into a date, given a "start date" at the left edge of the image, and an "end date" at the right edge.

Added Paths:
-----------
    trunk/archive-access/projects/wayback/wayback-webapp/src/main/webapp/js/graph-calc.js

Added: trunk/archive-access/projects/wayback/wayback-webapp/src/main/webapp/js/graph-calc.js
===================================================================
--- trunk/archive-access/projects/wayback/wayback-webapp/src/main/webapp/js/graph-calc.js	                        (rev 0)
+++ trunk/archive-access/projects/wayback/wayback-webapp/src/main/webapp/js/graph-calc.js	2010-04-24 00:42:27 UTC (rev 3062)
@@ -0,0 +1,50 @@
+function getEventX(event) {
+	var posx = 0;
+	if (event.pageX || event.pageY) {
+		posx =  event.pageX;
+	}
+	else if (event.clientX || event.clientY) 	{
+		posx = event.clientX + document.body.scrollLeft
+			+ document.documentElement.scrollLeft;
+	}
+	return posx;
+}
+function getElementX(obj) {
+	var x = 0;
+	if (obj.offsetParent) {
+		do {
+			x += obj.offsetLeft;
+		} while (obj = obj.offsetParent);
+	}
+	return x;
+}
+function zeroPad(str,len) {
+	var i;
+	var pad = "";
+	var s = str.toString();
+	for(i=s.length; i < len; i++) {
+		pad = "0".toString() + pad.toString();
+	}
+	return pad.toString() + s.toString();
+}
+
+function dateToTimestamp(date) {
+	return date.getFullYear() +
+		zeroPad(date.getMonth()+1,2) +
+		zeroPad(date.getDay()+1,2) +
+		zeroPad(date.getHours(),2) +
+		zeroPad(date.getMinutes(),2) +
+		zeroPad(date.getSeconds(),2);
+}
+
+function calcTimestamp(event,element,firstMS,lastMS) {
+	  var eventX = getEventX(event);
+	  var elementX = getElementX(element);
+	  var elementWidth = element.width;
+	  var msWidth = lastMS - firstMS;
+	  var x = eventX - elementX;
+	  var pct = x / elementWidth;
+	  var pctDate = pct * msWidth;
+	  var date = pctDate + firstMS;
+	  return dateToTimestamp(new Date(date));
+}


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