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1 | /** | ||
2 | * SVGPan library 1.2.1 | ||
3 | * ====================== | ||
4 | * | ||
5 | * Given an unique existing element with id "viewport" (or when missing, the first g | ||
6 | * element), including the the library into any SVG adds the following capabilities: | ||
7 | * | ||
8 | * - Mouse panning | ||
9 | * - Mouse zooming (using the wheel) | ||
10 | * - Object dragging | ||
11 | * | ||
12 | * You can configure the behaviour of the pan/zoom/drag with the variables | ||
13 | * listed in the CONFIGURATION section of this file. | ||
14 | * | ||
15 | * Known issues: | ||
16 | * | ||
17 | * - Zooming (while panning) on Safari has still some issues | ||
18 | * | ||
19 | * Releases: | ||
20 | * | ||
21 | * 1.2.1, Mon Jul 4 00:33:18 CEST 2011, Andrea Leofreddi | ||
22 | * - Fixed a regression with mouse wheel (now working on Firefox 5) | ||
23 | * - Working with viewBox attribute (#4) | ||
24 | * - Added "use strict;" and fixed resulting warnings (#5) | ||
25 | * - Added configuration variables, dragging is disabled by default (#3) | ||
26 | * | ||
27 | * 1.2, Sat Mar 20 08:42:50 GMT 2010, Zeng Xiaohui | ||
28 | * Fixed a bug with browser mouse handler interaction | ||
29 | * | ||
30 | * 1.1, Wed Feb 3 17:39:33 GMT 2010, Zeng Xiaohui | ||
31 | * Updated the zoom code to support the mouse wheel on Safari/Chrome | ||
32 | * | ||
33 | * 1.0, Andrea Leofreddi | ||
34 | * First release | ||
35 | * | ||
36 | * This code is licensed under the following BSD license: | ||
37 | * | ||
38 | * Copyright 2009-2010 Andrea Leofreddi <a.leofreddi@itcharm.com>. All rights reserved. | ||
39 | * | ||
40 | * Redistribution and use in source and binary forms, with or without modification, are | ||
41 | * permitted provided that the following conditions are met: | ||
42 | * | ||
43 | * 1. Redistributions of source code must retain the above copyright notice, this list of | ||
44 | * conditions and the following disclaimer. | ||
45 | * | ||
46 | * 2. Redistributions in binary form must reproduce the above copyright notice, this list | ||
47 | * of conditions and the following disclaimer in the documentation and/or other materials | ||
48 | * provided with the distribution. | ||
49 | * | ||
50 | * THIS SOFTWARE IS PROVIDED BY Andrea Leofreddi ``AS IS'' AND ANY EXPRESS OR IMPLIED | ||
51 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | ||
52 | * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL Andrea Leofreddi OR | ||
53 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | ||
54 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | ||
55 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | ||
56 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | ||
57 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | ||
58 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
59 | * | ||
60 | * The views and conclusions contained in the software and documentation are those of the | ||
61 | * authors and should not be interpreted as representing official policies, either expressed | ||
62 | * or implied, of Andrea Leofreddi. | ||
63 | */ | ||
64 | |||
65 | "use strict"; | ||
66 | |||
67 | /// CONFIGURATION | ||
68 | /// ====> | ||
69 | |||
70 | var enablePan = 1; // 1 or 0: enable or disable panning (default enabled) | ||
71 | var enableZoom = 1; // 1 or 0: enable or disable zooming (default enabled) | ||
72 | var enableDrag = 0; // 1 or 0: enable or disable dragging (default disabled) | ||
73 | |||
74 | /// <==== | ||
75 | /// END OF CONFIGURATION | ||
76 | |||
77 | var root = document.documentElement; | ||
78 | |||
79 | var state = 'none', svgRoot, stateTarget, stateOrigin, stateTf; | ||
80 | |||
81 | setupHandlers(root); | ||
82 | |||
83 | /** | ||
84 | * Register handlers | ||
85 | */ | ||
86 | function setupHandlers(root){ | ||
87 | setAttributes(root, { | ||
88 | "onmouseup" : "handleMouseUp(evt)", | ||
89 | "onmousedown" : "handleMouseDown(evt)", | ||
90 | "onmousemove" : "handleMouseMove(evt)", | ||
91 | //"onmouseout" : "handleMouseUp(evt)", // Decomment this to stop the pan functionality when dragging out of the SVG element | ||
92 | }); | ||
93 | |||
94 | if(navigator.userAgent.toLowerCase().indexOf('webkit') >= 0) | ||
95 | window.addEventListener('mousewheel', handleMouseWheel, false); // Chrome/Safari | ||
96 | else | ||
97 | window.addEventListener('DOMMouseScroll', handleMouseWheel, false); // Others | ||
98 | } | ||
99 | |||
100 | /** | ||
101 | * Retrieves the root element for SVG manipulation. The element is then cached into the svgRoot global variable. | ||
102 | */ | ||
103 | function getRoot(root) { | ||
104 | if(typeof(svgRoot) == "undefined") { | ||
105 | var g = null; | ||
106 | |||
107 | g = root.getElementById("viewport"); | ||
108 | |||
109 | if(g == null) | ||
110 | g = root.getElementsByTagName('g')[0]; | ||
111 | |||
112 | if(g == null) | ||
113 | alert('Unable to obtain SVG root element'); | ||
114 | |||
115 | setCTM(g, g.getCTM()); | ||
116 | |||
117 | g.removeAttribute("viewBox"); | ||
118 | |||
119 | svgRoot = g; | ||
120 | } | ||
121 | |||
122 | return svgRoot; | ||
123 | } | ||
124 | |||
125 | /** | ||
126 | * Instance an SVGPoint object with given event coordinates. | ||
127 | */ | ||
128 | function getEventPoint(evt) { | ||
129 | var p = root.createSVGPoint(); | ||
130 | |||
131 | p.x = evt.clientX; | ||
132 | p.y = evt.clientY; | ||
133 | |||
134 | return p; | ||
135 | } | ||
136 | |||
137 | /** | ||
138 | * Sets the current transform matrix of an element. | ||
139 | */ | ||
140 | function setCTM(element, matrix) { | ||
141 | var s = "matrix(" + matrix.a + "," + matrix.b + "," + matrix.c + "," + matrix.d + "," + matrix.e + "," + matrix.f + ")"; | ||
142 | |||
143 | element.setAttribute("transform", s); | ||
144 | } | ||
145 | |||
146 | /** | ||
147 | * Dumps a matrix to a string (useful for debug). | ||
148 | */ | ||
149 | function dumpMatrix(matrix) { | ||
150 | var s = "[ " + matrix.a + ", " + matrix.c + ", " + matrix.e + "\n " + matrix.b + ", " + matrix.d + ", " + matrix.f + "\n 0, 0, 1 ]"; | ||
151 | |||
152 | return s; | ||
153 | } | ||
154 | |||
155 | /** | ||
156 | * Sets attributes of an element. | ||
157 | */ | ||
158 | function setAttributes(element, attributes){ | ||
159 | for (var i in attributes) | ||
160 | element.setAttributeNS(null, i, attributes[i]); | ||
161 | } | ||
162 | |||
163 | /** | ||
164 | * Handle mouse wheel event. | ||
165 | */ | ||
166 | function handleMouseWheel(evt) { | ||
167 | if(!enableZoom) | ||
168 | return; | ||
169 | |||
170 | if(evt.preventDefault) | ||
171 | evt.preventDefault(); | ||
172 | |||
173 | evt.returnValue = false; | ||
174 | |||
175 | var svgDoc = evt.target.ownerDocument; | ||
176 | |||
177 | var delta; | ||
178 | |||
179 | if(evt.wheelDelta) | ||
180 | delta = evt.wheelDelta / 3600; // Chrome/Safari | ||
181 | else | ||
182 | delta = evt.detail / -90; // Mozilla | ||
183 | |||
184 | var z = 1 + delta; // Zoom factor: 0.9/1.1 | ||
185 | |||
186 | var g = getRoot(svgDoc); | ||
187 | |||
188 | var p = getEventPoint(evt); | ||
189 | |||
190 | p = p.matrixTransform(g.getCTM().inverse()); | ||
191 | |||
192 | // Compute new scale matrix in current mouse position | ||
193 | var k = root.createSVGMatrix().translate(p.x, p.y).scale(z).translate(-p.x, -p.y); | ||
194 | |||
195 | setCTM(g, g.getCTM().multiply(k)); | ||
196 | |||
197 | if(typeof(stateTf) == "undefined") | ||
198 | stateTf = g.getCTM().inverse(); | ||
199 | |||
200 | stateTf = stateTf.multiply(k.inverse()); | ||
201 | } | ||
202 | |||
203 | /** | ||
204 | * Handle mouse move event. | ||
205 | */ | ||
206 | function handleMouseMove(evt) { | ||
207 | if(evt.preventDefault) | ||
208 | evt.preventDefault(); | ||
209 | |||
210 | evt.returnValue = false; | ||
211 | |||
212 | var svgDoc = evt.target.ownerDocument; | ||
213 | |||
214 | var g = getRoot(svgDoc); | ||
215 | |||
216 | if(state == 'pan' && enablePan) { | ||
217 | // Pan mode | ||
218 | var p = getEventPoint(evt).matrixTransform(stateTf); | ||
219 | |||
220 | setCTM(g, stateTf.inverse().translate(p.x - stateOrigin.x, p.y - stateOrigin.y)); | ||
221 | } else if(state == 'drag' && enableDrag) { | ||
222 | // Drag mode | ||
223 | var p = getEventPoint(evt).matrixTransform(g.getCTM().inverse()); | ||
224 | |||
225 | setCTM(stateTarget, root.createSVGMatrix().translate(p.x - stateOrigin.x, p.y - stateOrigin.y).multiply(g.getCTM().inverse()).multiply(stateTarget.getCTM())); | ||
226 | |||
227 | stateOrigin = p; | ||
228 | } | ||
229 | } | ||
230 | |||
231 | /** | ||
232 | * Handle click event. | ||
233 | */ | ||
234 | function handleMouseDown(evt) { | ||
235 | if(evt.preventDefault) | ||
236 | evt.preventDefault(); | ||
237 | |||
238 | evt.returnValue = false; | ||
239 | |||
240 | var svgDoc = evt.target.ownerDocument; | ||
241 | |||
242 | var g = getRoot(svgDoc); | ||
243 | |||