/**
 *  SVGPan library 1.2.1
 * ======================
 *
 * Given an unique existing element with id "viewport" (or when missing, the first g
 * element), including the the library into any SVG adds the following capabilities:
 *
 *  - Mouse panning
 *  - Mouse zooming (using the wheel)
 *  - Object dragging
 *
 * You can configure the behaviour of the pan/zoom/drag with the variables
 * listed in the CONFIGURATION section of this file.
 *
 * Known issues:
 *
 *  - Zooming (while panning) on Safari has still some issues
 *
 * Releases:
 *
 * 1.2.1, Mon Jul  4 00:33:18 CEST 2011, Andrea Leofreddi
 *	- Fixed a regression with mouse wheel (now working on Firefox 5)
 *	- Working with viewBox attribute (#4)
 *	- Added "use strict;" and fixed resulting warnings (#5)
 *	- Added configuration variables, dragging is disabled by default (#3)
 *
 * 1.2, Sat Mar 20 08:42:50 GMT 2010, Zeng Xiaohui
 *	Fixed a bug with browser mouse handler interaction
 *
 * 1.1, Wed Feb  3 17:39:33 GMT 2010, Zeng Xiaohui
 *	Updated the zoom code to support the mouse wheel on Safari/Chrome
 *
 * 1.0, Andrea Leofreddi
 *	First release
 *
 * This code is licensed under the following BSD license:
 *
 * Copyright 2009-2010 Andrea Leofreddi <a.leofreddi@itcharm.com>. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 *
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list
 *       of conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY Andrea Leofreddi ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL Andrea Leofreddi OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are those of the
 * authors and should not be interpreted as representing official policies, either expressed
 * or implied, of Andrea Leofreddi.
 */

"use strict";

/// CONFIGURATION
/// ====>

var enablePan = 1; // 1 or 0: enable or disable panning (default enabled)
var enableZoom = 1; // 1 or 0: enable or disable zooming (default enabled)
var enableDrag = 0; // 1 or 0: enable or disable dragging (default disabled)

/// <====
/// END OF CONFIGURATION

var root = document.documentElement;

var state = 'none', svgRoot, stateTarget, stateOrigin, stateTf;

setupHandlers(root);

/**
 * Register handlers
 */
function setupHandlers(root){
	setAttributes(root, {
		"onmouseup" : "handleMouseUp(evt)",
		"onmousedown" : "handleMouseDown(evt)",
		"onmousemove" : "handleMouseMove(evt)",
		//"onmouseout" : "handleMouseUp(evt)", // Decomment this to stop the pan functionality when dragging out of the SVG element
	});

	if(navigator.userAgent.toLowerCase().indexOf('webkit') >= 0)
		window.addEventListener('mousewheel', handleMouseWheel, false); // Chrome/Safari
	else
		window.addEventListener('DOMMouseScroll', handleMouseWheel, false); // Others
}

/**
 * Retrieves the root element for SVG manipulation. The element is then cached into the svgRoot global variable.
 */
function getRoot(root) {
	if(typeof(svgRoot) == "undefined") {
		var g = null;

		g = root.getElementById("viewport");

		if(g == null)
			g = root.getElementsByTagName('g')[0];

		if(g == null)
			alert('Unable to obtain SVG root element');

		setCTM(g, g.getCTM());

		g.removeAttribute("viewBox");

		svgRoot = g;
	}

	return svgRoot;
}

/**
 * Instance an SVGPoint object with given event coordinates.
 */
function getEventPoint(evt) {
	var p = root.createSVGPoint();

	p.x = evt.clientX;
	p.y = evt.clientY;

	return p;
}

/**
 * Sets the current transform matrix of an element.
 */
function setCTM(element, matrix) {
	var s = "matrix(" + matrix.a + "," + matrix.b + "," + matrix.c + "," + matrix.d + "," + matrix.e + "," + matrix.f + ")";

	element.setAttribute("transform", s);
}

/**
 * Dumps a matrix to a string (useful for debug).
 */
function dumpMatrix(matrix) {
	var s = "[ " + matrix.a + ", " + matrix.c + ", " + matrix.e + "\n  " + matrix.b + ", " + matrix.d + ", " + matrix.f + "\n  0, 0, 1 ]";

	return s;
}

/**
 * Sets attributes of an element.
 */
function setAttributes(element, attributes){
	for (var i in attributes)
		element.setAttributeNS(null, i, attributes[i]);
}

/**
 * Handle mouse wheel event.
 */
function handleMouseWheel(evt) {
	if(!enableZoom)
		return;

	if(evt.preventDefault)
		evt.preventDefault();

	evt.returnValue = false;

	var svgDoc = evt.target.ownerDocument;

	var delta;

	if(evt.wheelDelta)
		delta = evt.wheelDelta / 3600; // Chrome/Safari
	else
		delta = evt.detail / -90; // Mozilla

	var z = 1 + delta; // Zoom factor: 0.9/1.1

	var g = getRoot(svgDoc);

	var p = getEventPoint(evt);

	p = p.matrixTransform(g.getCTM().inverse());

	// Compute new scale matrix in current mouse position
	var k = root.createSVGMatrix().translate(p.x, p.y).scale(z).translate(-p.x, -p.y);

        setCTM(g, g.getCTM().multiply(k));

	if(typeof(stateTf) == "undefined")
		stateTf = g.getCTM().inverse();

	stateTf = stateTf.multiply(k.inverse());
}

/**
 * Handle mouse move event.
 */
function handleMouseMove(evt) {
	if(evt.preventDefault)
		evt.preventDefault();

	evt.returnValue = false;

	var svgDoc = evt.target.ownerDocument;

	var g = getRoot(svgDoc);

	if(state == 'pan' && enablePan) {
		// Pan mode
		var p = getEventPoint(evt).matrixTransform(stateTf);

		setCTM(g, stateTf.inverse().translate(p.x - stateOrigin.x, p.y - stateOrigin.y));
	} else if(state == 'drag' && enableDrag) {
		// Drag mode
		var p = getEventPoint(evt).matrixTransform(g.getCTM().inverse());

		setCTM(stateTarget, root.createSVGMatrix().translate(p.x - stateOrigin.x, p.y - stateOrigin.y).multiply(g.getCTM().inverse()).multiply(stateTarget.getCTM()));

		stateOrigin = p;
	}
}

/**
 * Handle click event.
 */
function handleMouseDown(evt) {
	if(evt.preventDefault)
		evt.preventDefault();

	evt.returnValue = false;

	var svgDoc = evt.target.ownerDocument;

	var g = getRoot(svgDoc);

	if(
		evt.target.tagName == "svg"
		|| !enableDrag // Pan anyway when drag is disabled and the user clicked on an element
	) {
		// Pan mode
		state = 'pan';

		stateTf = g.getCTM().inverse();

		stateOrigin = getEventPoint(evt).matrixTransform(stateTf);
	} else {
		// Drag mode
		state = 'drag';

		stateTarget = evt.target;

		stateTf = g.getCTM().inverse();

		stateOrigin = getEventPoint(evt).matrixTransform(stateTf);
	}
}

/**
 * Handle mouse button release event.
 */
function handleMouseUp(evt) {
	if(evt.preventDefault)
		evt.preventDefault();

	evt.returnValue = false;

	var svgDoc = evt.target.ownerDocument;

	if(state == 'pan' || state == 'drag') {
		// Quit pan mode
		state = '';
	}
}