Start on a units JS package. Rename BrowserSupport and Utilities packages to lower-case

git-svn-id: http://svg-edit.googlecode.com/svn/trunk@1844 eee81c28-f429-11dd-99c0-75d572ba1ddd

editor/units.js

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+/**
+ * Package: svgedit.units
+ *
+ * Licensed under the Apache License, Version 2
+ *
+ * Copyright(c) 2010 Alexis Deveria
+ * Copyright(c) 2010 Jeff Schiller
+ */
+
+// Dependencies:
+// 1) jQuery
+
+(function() {
+
+if (!window.svgedit) {
+	window.svgedit = {};
+}
+
+if (!svgedit.units) {
+	svgedit.units = {};
+}
+
+var w_attrs = ['x', 'x1', 'cx', 'rx', 'width'];
+var h_attrs = ['y', 'y1', 'cy', 'ry', 'height'];
+var unit_attrs = $.merge(['r','radius'], w_attrs);
+
+var unitNumMap = {
+	'%':  2,
+	'em': 3,
+	'ex': 4,
+	'px': 5,
+	'cm': 6,
+	'mm': 7,
+	'in': 8,
+	'pt': 9,
+	'pc': 10
+};
+
+$.merge(unit_attrs, h_attrs);
+
+/**
+ * Stores mapping of unit type to user coordinates.
+ */
+svgedit.units.typeMap = {px: 1};
+
+/**
+ * Initializes this module.
+ */
+svgedit.units.init = function() {
+	var svgns = 'http://www.w3.org/2000/svg';
+
+	// Get correct em/ex values by creating a temporary SVG.
+	var svg = document.createElementNS(svgns, 'svg');
+	document.body.appendChild(svg);
+	var rect = document.createElementNS(svgns,'rect');
+	rect.setAttribute('width',"1em");
+	rect.setAttribute('height',"1ex");
+	rect.setAttribute('x',"1in");
+	svg.appendChild(rect);
+	var bb = rect.getBBox();
+	document.body.removeChild(svg);
+
+	var inch = bb.x;
+	svgedit.units.typeMap['em'] = bb.width;
+	svgedit.units.typeMap['ex'] = bb.height;
+	svgedit.units.typeMap['in'] = inch;
+	svgedit.units.typeMap['cm'] = inch / 2.54;
+	svgedit.units.typeMap['mm'] = inch / 25.4;
+	svgedit.units.typeMap['pt'] = inch / 72;
+	svgedit.units.typeMap['pc'] = inch / 6;
+	svgedit.units.typeMap['%'] = 0;
+};
+
+})();