647 lines
17 KiB
JavaScript
647 lines
17 KiB
JavaScript
/**
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* Package: svgedit.utilities
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*
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* Licensed under the Apache License, Version 2
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*
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* Copyright(c) 2010 Alexis Deveria
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* Copyright(c) 2010 Jeff Schiller
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*/
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// Dependencies:
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// 1) jQuery
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// 2) browser.js
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// 3) svgtransformlist.js
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var svgedit = svgedit || {};
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(function() {
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if (!svgedit.utilities) {
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svgedit.utilities = {};
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}
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// Constants
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// String used to encode base64.
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var KEYSTR = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
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var SVGNS = 'http://www.w3.org/2000/svg';
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var XLINKNS = 'http://www.w3.org/1999/xlink';
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var XMLNS = "http://www.w3.org/XML/1998/namespace";
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// Much faster than running getBBox() every time
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var visElems = 'a,circle,ellipse,foreignObject,g,image,line,path,polygon,polyline,rect,svg,text,tspan,use';
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var visElems_arr = visElems.split(',');
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//var hidElems = 'clipPath,defs,desc,feGaussianBlur,filter,linearGradient,marker,mask,metadata,pattern,radialGradient,stop,switch,symbol,title,textPath';
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var editorContext_ = null;
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var domdoc_ = null;
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var domcontainer_ = null;
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var svgroot_ = null;
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svgedit.utilities.init = function(editorContext) {
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editorContext_ = editorContext;
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domdoc_ = editorContext.getDOMDocument();
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domcontainer_ = editorContext.getDOMContainer();
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svgroot_ = editorContext.getSVGRoot();
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};
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// Function: svgedit.utilities.toXml
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// Converts characters in a string to XML-friendly entities.
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//
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// Example: "&" becomes "&"
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//
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// Parameters:
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// str - The string to be converted
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//
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// Returns:
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// The converted string
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svgedit.utilities.toXml = function(str) {
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return $('<p/>').text(str).html();
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};
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// Function: svgedit.utilities.fromXml
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// Converts XML entities in a string to single characters.
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// Example: "&" becomes "&"
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//
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// Parameters:
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// str - The string to be converted
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//
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// Returns:
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// The converted string
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svgedit.utilities.fromXml = function(str) {
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return $('<p/>').html(str).text();
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};
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// This code was written by Tyler Akins and has been placed in the
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// public domain. It would be nice if you left this header intact.
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// Base64 code from Tyler Akins -- http://rumkin.com
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// schiller: Removed string concatenation in favour of Array.join() optimization,
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// also precalculate the size of the array needed.
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// Function: svgedit.utilities.encode64
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// Converts a string to base64
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svgedit.utilities.encode64 = function(input) {
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// base64 strings are 4/3 larger than the original string
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// input = svgedit.utilities.encodeUTF8(input); // convert non-ASCII characters
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input = svgedit.utilities.convertToXMLReferences(input);
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if(window.btoa) return window.btoa(input); // Use native if available
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var output = new Array( Math.floor( (input.length + 2) / 3 ) * 4 );
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var chr1, chr2, chr3;
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var enc1, enc2, enc3, enc4;
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var i = 0, p = 0;
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do {
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chr1 = input.charCodeAt(i++);
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chr2 = input.charCodeAt(i++);
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chr3 = input.charCodeAt(i++);
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enc1 = chr1 >> 2;
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enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
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enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
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enc4 = chr3 & 63;
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if (isNaN(chr2)) {
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enc3 = enc4 = 64;
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} else if (isNaN(chr3)) {
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enc4 = 64;
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}
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output[p++] = KEYSTR.charAt(enc1);
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output[p++] = KEYSTR.charAt(enc2);
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output[p++] = KEYSTR.charAt(enc3);
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output[p++] = KEYSTR.charAt(enc4);
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} while (i < input.length);
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return output.join('');
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};
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// Function: svgedit.utilities.decode64
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// Converts a string from base64
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svgedit.utilities.decode64 = function(input) {
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if(window.atob) return window.atob(input);
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var output = "";
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var chr1, chr2, chr3 = "";
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var enc1, enc2, enc3, enc4 = "";
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var i = 0;
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// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
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input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
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do {
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enc1 = KEYSTR.indexOf(input.charAt(i++));
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enc2 = KEYSTR.indexOf(input.charAt(i++));
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enc3 = KEYSTR.indexOf(input.charAt(i++));
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enc4 = KEYSTR.indexOf(input.charAt(i++));
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chr1 = (enc1 << 2) | (enc2 >> 4);
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chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
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chr3 = ((enc3 & 3) << 6) | enc4;
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output = output + String.fromCharCode(chr1);
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if (enc3 != 64) {
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output = output + String.fromCharCode(chr2);
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}
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if (enc4 != 64) {
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output = output + String.fromCharCode(chr3);
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}
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chr1 = chr2 = chr3 = "";
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enc1 = enc2 = enc3 = enc4 = "";
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} while (i < input.length);
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return unescape(output);
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};
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// Currently not being used, so commented out for now
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// based on http://phpjs.org/functions/utf8_encode:577
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// codedread:does not seem to work with webkit-based browsers on OSX
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// "encodeUTF8": function(input) {
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// //return unescape(encodeURIComponent(input)); //may or may not work
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// var output = '';
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// for (var n = 0; n < input.length; n++){
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// var c = input.charCodeAt(n);
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// if (c < 128) {
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// output += input[n];
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// }
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// else if (c > 127) {
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// if (c < 2048){
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// output += String.fromCharCode((c >> 6) | 192);
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// }
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// else {
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// output += String.fromCharCode((c >> 12) | 224) + String.fromCharCode((c >> 6) & 63 | 128);
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// }
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// output += String.fromCharCode((c & 63) | 128);
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// }
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// }
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// return output;
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// },
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// Function: svgedit.utilities.convertToXMLReferences
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// Converts a string to use XML references
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svgedit.utilities.convertToXMLReferences = function(input) {
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var output = '';
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for (var n = 0; n < input.length; n++){
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var c = input.charCodeAt(n);
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if (c < 128) {
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output += input[n];
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} else if(c > 127) {
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output += ("&#" + c + ";");
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}
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}
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return output;
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};
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// Function: svgedit.utilities.text2xml
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// Cross-browser compatible method of converting a string to an XML tree
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// found this function here: http://groups.google.com/group/jquery-dev/browse_thread/thread/c6d11387c580a77f
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svgedit.utilities.text2xml = function(sXML) {
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if(sXML.indexOf('<svg:svg') >= 0) {
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sXML = sXML.replace(/<(\/?)svg:/g, '<$1').replace('xmlns:svg', 'xmlns');
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}
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var out;
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try{
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var dXML = (window.DOMParser)?new DOMParser():new ActiveXObject("Microsoft.XMLDOM");
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dXML.async = false;
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} catch(e){
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throw new Error("XML Parser could not be instantiated");
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};
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try{
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if(dXML.loadXML) out = (dXML.loadXML(sXML))?dXML:false;
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else out = dXML.parseFromString(sXML, "text/xml");
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}
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catch(e){ throw new Error("Error parsing XML string"); };
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return out;
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};
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// Function: svgedit.utilities.bboxToObj
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// Converts a SVGRect into an object.
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//
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// Parameters:
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// bbox - a SVGRect
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//
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// Returns:
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// An object with properties names x, y, width, height.
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svgedit.utilities.bboxToObj = function(bbox) {
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return {
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x: bbox.x,
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y: bbox.y,
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width: bbox.width,
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height: bbox.height
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}
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};
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// Function: svgedit.utilities.walkTree
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// Walks the tree and executes the callback on each element in a top-down fashion
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//
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// Parameters:
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// elem - DOM element to traverse
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// cbFn - Callback function to run on each element
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svgedit.utilities.walkTree = function(elem, cbFn){
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if (elem && elem.nodeType == 1) {
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cbFn(elem);
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var i = elem.childNodes.length;
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while (i--) {
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svgedit.utilities.walkTree(elem.childNodes.item(i), cbFn);
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}
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}
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};
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// Function: svgedit.utilities.walkTreePost
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// Walks the tree and executes the callback on each element in a depth-first fashion
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// TODO: FIXME: Shouldn't this be calling walkTreePost?
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//
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// Parameters:
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// elem - DOM element to traverse
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// cbFn - Callback function to run on each element
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svgedit.utilities.walkTreePost = function(elem, cbFn) {
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if (elem && elem.nodeType == 1) {
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var i = elem.childNodes.length;
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while (i--) {
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svgedit.utilities.walkTree(elem.childNodes.item(i), cbFn);
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}
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cbFn(elem);
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}
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};
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// Function: svgedit.utilities.getUrlFromAttr
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// Extracts the URL from the url(...) syntax of some attributes.
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// Three variants:
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// * <circle fill="url(someFile.svg#foo)" />
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// * <circle fill="url('someFile.svg#foo')" />
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// * <circle fill='url("someFile.svg#foo")' />
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//
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// Parameters:
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// attrVal - The attribute value as a string
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//
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// Returns:
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// String with just the URL, like someFile.svg#foo
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svgedit.utilities.getUrlFromAttr = function(attrVal) {
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if (attrVal) {
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// url("#somegrad")
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if (attrVal.indexOf('url("') === 0) {
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return attrVal.substring(5,attrVal.indexOf('"',6));
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}
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// url('#somegrad')
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else if (attrVal.indexOf("url('") === 0) {
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return attrVal.substring(5,attrVal.indexOf("'",6));
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}
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else if (attrVal.indexOf("url(") === 0) {
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return attrVal.substring(4,attrVal.indexOf(')'));
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}
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}
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return null;
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};
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// Function: svgedit.utilities.getHref
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// Returns the given element's xlink:href value
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svgedit.utilities.getHref = function(elem) {
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return elem.getAttributeNS(XLINKNS, "href");
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}
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// Function: svgedit.utilities.setHref
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// Sets the given element's xlink:href value
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svgedit.utilities.setHref = function(elem, val) {
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elem.setAttributeNS(XLINKNS, "xlink:href", val);
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}
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// Function: findDefs
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// Parameters:
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// svgElement - The <svg> element.
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//
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// Returns:
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// The document's <defs> element, create it first if necessary
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svgedit.utilities.findDefs = function(svgElement) {
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var svgElement = editorContext_.getSVGContent().documentElement;
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var defs = svgElement.getElementsByTagNameNS(SVGNS, "defs");
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if (defs.length > 0) {
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defs = defs[0];
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}
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else {
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// first child is a comment, so call nextSibling
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defs = svgElement.insertBefore( svgElement.ownerDocument.createElementNS(SVGNS, "defs" ), svgElement.firstChild.nextSibling);
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}
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return defs;
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};
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// TODO(codedread): Consider moving the next to functions to bbox.js
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// Function: svgedit.utilities.getPathBBox
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// Get correct BBox for a path in Webkit
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// Converted from code found here:
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// http://blog.hackers-cafe.net/2009/06/how-to-calculate-bezier-curves-bounding.html
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//
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// Parameters:
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// path - The path DOM element to get the BBox for
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//
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// Returns:
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// A BBox-like object
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svgedit.utilities.getPathBBox = function(path) {
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var seglist = path.pathSegList;
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var tot = seglist.numberOfItems;
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var bounds = [[], []];
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var start = seglist.getItem(0);
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var P0 = [start.x, start.y];
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for(var i=0; i < tot; i++) {
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var seg = seglist.getItem(i);
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if(!seg.x) continue;
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// Add actual points to limits
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bounds[0].push(P0[0]);
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bounds[1].push(P0[1]);
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if(seg.x1) {
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var P1 = [seg.x1, seg.y1],
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P2 = [seg.x2, seg.y2],
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P3 = [seg.x, seg.y];
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for(var j=0; j < 2; j++) {
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var calc = function(t) {
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return Math.pow(1-t,3) * P0[j]
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+ 3 * Math.pow(1-t,2) * t * P1[j]
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+ 3 * (1-t) * Math.pow(t,2) * P2[j]
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+ Math.pow(t,3) * P3[j];
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};
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var b = 6 * P0[j] - 12 * P1[j] + 6 * P2[j];
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var a = -3 * P0[j] + 9 * P1[j] - 9 * P2[j] + 3 * P3[j];
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var c = 3 * P1[j] - 3 * P0[j];
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if(a == 0) {
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if(b == 0) {
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continue;
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}
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var t = -c / b;
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if(0 < t && t < 1) {
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bounds[j].push(calc(t));
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}
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continue;
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}
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var b2ac = Math.pow(b,2) - 4 * c * a;
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if(b2ac < 0) continue;
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var t1 = (-b + Math.sqrt(b2ac))/(2 * a);
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if(0 < t1 && t1 < 1) bounds[j].push(calc(t1));
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var t2 = (-b - Math.sqrt(b2ac))/(2 * a);
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if(0 < t2 && t2 < 1) bounds[j].push(calc(t2));
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}
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P0 = P3;
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} else {
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bounds[0].push(seg.x);
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bounds[1].push(seg.y);
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}
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}
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var x = Math.min.apply(null, bounds[0]);
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var w = Math.max.apply(null, bounds[0]) - x;
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var y = Math.min.apply(null, bounds[1]);
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var h = Math.max.apply(null, bounds[1]) - y;
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return {
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'x': x,
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'y': y,
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'width': w,
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'height': h
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};
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};
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// Function: groupBBFix
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// Get the given/selected element's bounding box object, checking for
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// horizontal/vertical lines (see issue 717)
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// Note that performance is currently terrible, so some way to improve would
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// be great.
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//
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// Parameters:
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// selected - Container or <use> DOM element
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function groupBBFix(selected) {
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if(svgedit.browser.supportsHVLineContainerBBox()) {
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try { return selected.getBBox();} catch(e){}
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}
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var ref = $.data(selected, 'ref');
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var matched = null;
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if(ref) {
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var copy = $(ref).children().clone().attr('visibility', 'hidden');
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$(svgroot_).append(copy);
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matched = copy.filter('line, path');
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} else {
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matched = $(selected).find('line, path');
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}
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var issue = false;
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if(matched.length) {
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matched.each(function() {
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var bb = this.getBBox();
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if(!bb.width || !bb.height) {
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issue = true;
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}
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});
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if(issue) {
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var elems = ref ? copy : $(selected).children();
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ret = getStrokedBBox(elems);
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} else {
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ret = selected.getBBox();
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}
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} else {
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ret = selected.getBBox();
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}
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if(ref) {
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copy.remove();
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}
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return ret;
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}
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// Function: svgedit.utilities.getBBox
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// Get the given/selected element's bounding box object, convert it to be more
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// usable when necessary
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//
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// Parameters:
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// elem - Optional DOM element to get the BBox for
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svgedit.utilities.getBBox = function(elem) {
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var selected = elem || editorContext_.geSelectedElements()[0];
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if (elem.nodeType != 1) return null;
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var ret = null;
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var elname = selected.nodeName;
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switch ( elname ) {
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case 'text':
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if(selected.textContent === '') {
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selected.textContent = 'a'; // Some character needed for the selector to use.
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ret = selected.getBBox();
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selected.textContent = '';
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} else {
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try { ret = selected.getBBox();} catch(e){}
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}
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break;
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case 'path':
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if(!svgedit.browser.supportsPathBBox()) {
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ret = svgedit.utilities.getPathBBox(selected);
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} else {
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try { ret = selected.getBBox();} catch(e){}
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}
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break;
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case 'g':
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case 'a':
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ret = groupBBFix(selected);
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break;
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default:
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if(elname === 'use') {
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ret = groupBBFix(selected, true);
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}
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if(elname === 'use' || elname === 'foreignObject') {
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if(!ret) ret = selected.getBBox();
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if(!svgedit.browser.isWebkit()) {
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var bb = {};
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bb.width = ret.width;
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bb.height = ret.height;
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bb.x = ret.x + parseFloat(selected.getAttribute('x')||0);
|
|
bb.y = ret.y + parseFloat(selected.getAttribute('y')||0);
|
|
ret = bb;
|
|
}
|
|
} else if(~visElems_arr.indexOf(elname)) {
|
|
try { ret = selected.getBBox();}
|
|
catch(e) {
|
|
// Check if element is child of a foreignObject
|
|
var fo = $(selected).closest("foreignObject");
|
|
if(fo.length) {
|
|
try {
|
|
ret = fo[0].getBBox();
|
|
} catch(e) {
|
|
ret = null;
|
|
}
|
|
} else {
|
|
ret = null;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if(ret) {
|
|
ret = svgedit.utilities.bboxToObj(ret);
|
|
}
|
|
|
|
// get the bounding box from the DOM (which is in that element's coordinate system)
|
|
return ret;
|
|
};
|
|
|
|
// Function: svgedit.utilities.getRotationAngle
|
|
// Get the rotation angle of the given/selected DOM element
|
|
//
|
|
// Parameters:
|
|
// elem - Optional DOM element to get the angle for
|
|
// to_rad - Boolean that when true returns the value in radians rather than degrees
|
|
//
|
|
// Returns:
|
|
// Float with the angle in degrees or radians
|
|
svgedit.utilities.getRotationAngle = function(elem, to_rad) {
|
|
var selected = elem || editorContext_.getSelectedElements()[0];
|
|
// find the rotation transform (if any) and set it
|
|
var tlist = svgedit.transformlist.getTransformList(selected);
|
|
if(!tlist) return 0; // <svg> elements have no tlist
|
|
var N = tlist.numberOfItems;
|
|
for (var i = 0; i < N; ++i) {
|
|
var xform = tlist.getItem(i);
|
|
if (xform.type == 4) {
|
|
return to_rad ? xform.angle * Math.PI / 180.0 : xform.angle;
|
|
}
|
|
}
|
|
return 0.0;
|
|
};
|
|
|
|
// Function: getElem
|
|
// Get a DOM element by ID within the SVG root element.
|
|
//
|
|
// Parameters:
|
|
// id - String with the element's new ID
|
|
if (svgedit.browser.supportsSelectors()) {
|
|
svgedit.utilities.getElem = function(id) {
|
|
// querySelector lookup
|
|
return svgroot_.querySelector('#'+id);
|
|
};
|
|
} else if (svgedit.browser.supportsXpath()) {
|
|
svgedit.utilities.getElem = function(id) {
|
|
// xpath lookup
|
|
return domdoc_.evaluate(
|
|
'svg:svg[@id="svgroot"]//svg:*[@id="'+id+'"]',
|
|
domcontainer_,
|
|
function() { return "http://www.w3.org/2000/svg"; },
|
|
9,
|
|
null).singleNodeValue;
|
|
};
|
|
} else {
|
|
svgedit.utilities.getElem = function(id) {
|
|
// jQuery lookup: twice as slow as xpath in FF
|
|
return $(svgroot_).find('[id=' + id + ']')[0];
|
|
};
|
|
}
|
|
|
|
// Function: assignAttributes
|
|
// Assigns multiple attributes to an element.
|
|
//
|
|
// Parameters:
|
|
// node - DOM element to apply new attribute values to
|
|
// attrs - Object with attribute keys/values
|
|
// suspendLength - Optional integer of milliseconds to suspend redraw
|
|
// unitCheck - Boolean to indicate the need to use svgedit.units.setUnitAttr
|
|
svgedit.utilities.assignAttributes = function(node, attrs, suspendLength, unitCheck) {
|
|
if(!suspendLength) suspendLength = 0;
|
|
// Opera has a problem with suspendRedraw() apparently
|
|
var handle = null;
|
|
if (!svgedit.browser.isOpera()) svgroot_.suspendRedraw(suspendLength);
|
|
|
|
for (var i in attrs) {
|
|
var ns = (i.substr(0,4) === "xml:" ? XMLNS :
|
|
i.substr(0,6) === "xlink:" ? XLINKNS : null);
|
|
|
|
if(ns) {
|
|
node.setAttributeNS(ns, i, attrs[i]);
|
|
} else if(!unitCheck) {
|
|
node.setAttribute(i, attrs[i]);
|
|
} else {
|
|
svgedit.units.setUnitAttr(node, i, attrs[i]);
|
|
}
|
|
|
|
}
|
|
|
|
if (!svgedit.browser.isOpera()) svgroot_.unsuspendRedraw(handle);
|
|
};
|
|
|
|
// Function: cleanupElement
|
|
// Remove unneeded (default) attributes, makes resulting SVG smaller
|
|
//
|
|
// Parameters:
|
|
// element - DOM element to clean up
|
|
svgedit.utilities.cleanupElement = function(element) {
|
|
var handle = svgroot_.suspendRedraw(60);
|
|
var defaults = {
|
|
'fill-opacity':1,
|
|
'stop-opacity':1,
|
|
'opacity':1,
|
|
'stroke':'none',
|
|
'stroke-dasharray':'none',
|
|
'stroke-linejoin':'miter',
|
|
'stroke-linecap':'butt',
|
|
'stroke-opacity':1,
|
|
'stroke-width':1,
|
|
'rx':0,
|
|
'ry':0
|
|
}
|
|
|
|
for(var attr in defaults) {
|
|
var val = defaults[attr];
|
|
if(element.getAttribute(attr) == val) {
|
|
element.removeAttribute(attr);
|
|
}
|
|
}
|
|
|
|
svgroot_.unsuspendRedraw(handle);
|
|
};
|
|
|
|
|
|
})(); |