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/** * SVGPan library 1.2 - phpDocumentor1 * ==================== * * Given an unique existing element with id "viewport", including the * the library into any SVG adds the following capabilities: * * - Mouse panning * - Mouse zooming (using the wheel) * - Object dargging * * Known issues: * * - Zooming (while panning) on Safari has still some issues * * Releases: * * 1.2 - phpDocumentor1, Fri Apr 08 19:19:00 CET 2011, Mike van Riel * Increased zoom speed with 20% * Disabled element moving functionality * * 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. */ var root = document.documentElement; var state = 'none', stateTarget, stateOrigin, stateTf; setupHandlers(root); /** * Register handlers */ function setupHandlers(root){ setAttributes(root, { "onmouseup" : "add(evt)", "onmousedown" : "handleMouseDown(evt)", "onmousemove" : "handleMouseMove(evt)", "onmouseup" : "handleMouseUp(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 } /** * 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 (i in attributes) element.setAttributeNS(null, i, attributes[i]); } /** * Handle mouse move event. */ function handleMouseWheel(evt) { 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 * 1.2); // Zoom factor: 0.9/1.1 var g = svgDoc.getElementById("viewport"); 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)); 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 = svgDoc.getElementById("viewport"); if(state == 'pan') { // Pan mode var p = getEventPoint(evt).matrixTransform(stateTf); setCTM(g, stateTf.inverse().translate(p.x - stateOrigin.x, p.y - stateOrigin.y)); } else if(state == 'move') { // Move 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 = svgDoc.getElementById("viewport"); // if(evt.target.tagName == "svg") { // Pan mode state = 'pan'; stateTf = g.getCTM().inverse(); stateOrigin = getEventPoint(evt).matrixTransform(stateTf); // } else { // Move mode // state = 'move'; // // 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 == 'move') { // Quit pan mode state = ''; } }