233 lines
6.2 KiB
JavaScript
233 lines
6.2 KiB
JavaScript
/**
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* SVGPan library 1.2 - phpDocumentor1
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* ====================
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*
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* Given an unique existing element with id "viewport", including the
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* the library into any SVG adds the following capabilities:
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*
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* - Mouse panning
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* - Mouse zooming (using the wheel)
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* - Object dargging
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*
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* Known issues:
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*
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* - Zooming (while panning) on Safari has still some issues
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*
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* Releases:
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*
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* 1.2 - phpDocumentor1, Fri Apr 08 19:19:00 CET 2011, Mike van Riel
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* Increased zoom speed with 20%
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* Disabled element moving functionality
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*
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* 1.2, Sat Mar 20 08:42:50 GMT 2010, Zeng Xiaohui
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* Fixed a bug with browser mouse handler interaction
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*
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* 1.1, Wed Feb 3 17:39:33 GMT 2010, Zeng Xiaohui
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* Updated the zoom code to support the mouse wheel on Safari/Chrome
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*
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* 1.0, Andrea Leofreddi
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* First release
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*
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* This code is licensed under the following BSD license:
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*
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* Copyright 2009-2010 Andrea Leofreddi <a.leofreddi@itcharm.com>. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are
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* permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY Andrea Leofreddi ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL Andrea Leofreddi OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* The views and conclusions contained in the software and documentation are those of the
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* authors and should not be interpreted as representing official policies, either expressed
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* or implied, of Andrea Leofreddi.
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*/
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var root = document.documentElement;
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var state = 'none', stateTarget, stateOrigin, stateTf;
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setupHandlers(root);
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/**
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* Register handlers
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*/
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function setupHandlers(root){
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setAttributes(root, {
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"onmouseup" : "add(evt)",
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"onmousedown" : "handleMouseDown(evt)",
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"onmousemove" : "handleMouseMove(evt)",
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"onmouseup" : "handleMouseUp(evt)",
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// "onmouseout" : "handleMouseUp(evt)" // Decomment this to stop the pan functionality when dragging out of the SVG element
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});
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if(navigator.userAgent.toLowerCase().indexOf('webkit') >= 0)
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window.addEventListener('mousewheel', handleMouseWheel, false); // Chrome/Safari
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else
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window.addEventListener('DOMMouseScroll', handleMouseWheel, false); // Others
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}
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/**
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* Instance an SVGPoint object with given event coordinates.
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*/
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function getEventPoint(evt) {
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var p = root.createSVGPoint();
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p.x = evt.clientX;
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p.y = evt.clientY;
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return p;
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}
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/**
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* Sets the current transform matrix of an element.
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*/
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function setCTM(element, matrix) {
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var s = "matrix(" + matrix.a + "," + matrix.b + "," + matrix.c + "," + matrix.d + "," + matrix.e + "," + matrix.f + ")";
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element.setAttribute("transform", s);
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}
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/**
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* Dumps a matrix to a string (useful for debug).
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*/
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function dumpMatrix(matrix) {
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var s = "[ " + matrix.a + ", " + matrix.c + ", " + matrix.e + "\n " + matrix.b + ", " + matrix.d + ", " + matrix.f + "\n 0, 0, 1 ]";
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return s;
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}
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/**
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* Sets attributes of an element.
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*/
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function setAttributes(element, attributes){
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for (i in attributes)
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element.setAttributeNS(null, i, attributes[i]);
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}
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/**
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* Handle mouse move event.
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*/
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function handleMouseWheel(evt) {
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if(evt.preventDefault)
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evt.preventDefault();
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evt.returnValue = false;
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var svgDoc = evt.target.ownerDocument;
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var delta;
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if(evt.wheelDelta)
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delta = evt.wheelDelta / 3600; // Chrome/Safari
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else
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delta = evt.detail / -90; // Mozilla
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var z = 1 + (delta * 1.2); // Zoom factor: 0.9/1.1
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var g = svgDoc.getElementById("viewport");
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var p = getEventPoint(evt);
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p = p.matrixTransform(g.getCTM().inverse());
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// Compute new scale matrix in current mouse position
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var k = root.createSVGMatrix().translate(p.x, p.y).scale(z).translate(-p.x, -p.y);
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setCTM(g, g.getCTM().multiply(k));
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stateTf = stateTf.multiply(k.inverse());
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}
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/**
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* Handle mouse move event.
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*/
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function handleMouseMove(evt) {
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if(evt.preventDefault)
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evt.preventDefault();
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evt.returnValue = false;
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var svgDoc = evt.target.ownerDocument;
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var g = svgDoc.getElementById("viewport");
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if(state == 'pan') {
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// Pan mode
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var p = getEventPoint(evt).matrixTransform(stateTf);
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setCTM(g, stateTf.inverse().translate(p.x - stateOrigin.x, p.y - stateOrigin.y));
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} else if(state == 'move') {
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// Move mode
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var p = getEventPoint(evt).matrixTransform(g.getCTM().inverse());
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setCTM(stateTarget, root.createSVGMatrix().translate(p.x - stateOrigin.x, p.y - stateOrigin.y).multiply(g.getCTM().inverse()).multiply(stateTarget.getCTM()));
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stateOrigin = p;
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}
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}
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/**
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* Handle click event.
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*/
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function handleMouseDown(evt) {
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if(evt.preventDefault)
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evt.preventDefault();
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evt.returnValue = false;
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var svgDoc = evt.target.ownerDocument;
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var g = svgDoc.getElementById("viewport");
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// if(evt.target.tagName == "svg") {
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// Pan mode
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state = 'pan';
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stateTf = g.getCTM().inverse();
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stateOrigin = getEventPoint(evt).matrixTransform(stateTf);
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// } else {
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// Move mode
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// state = 'move';
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//
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// stateTarget = evt.target;
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//
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// stateTf = g.getCTM().inverse();
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//
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// stateOrigin = getEventPoint(evt).matrixTransform(stateTf);
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// }
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}
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/**
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* Handle mouse button release event.
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*/
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function handleMouseUp(evt) {
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if(evt.preventDefault)
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evt.preventDefault();
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evt.returnValue = false;
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var svgDoc = evt.target.ownerDocument;
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if(state == 'pan' || state == 'move') {
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// Quit pan mode
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state = '';
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}
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}
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