/**
* SVG-edit Utilities
*
* Licensed under the Apache License, Version 2
*
* Copyright(c) 2010 Alexis Deveria
* Copyright(c) 2010 Jeff Schiller
*/
// Dependencies:
// 1) jQuery
(function() {
if (!window.svgedit) {
window.svgedit = {};
}
if (!svgedit.Utilities) {
svgedit.Utilities = {};
}
// Constants
// String used to encode base64.
var KEYSTR = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
var XLINKNS = "http://www.w3.org/1999/xlink";
// Function: svgedit.Utilities.toXml
// Converts characters in a string to XML-friendly entities.
//
// Example: "&" becomes "&"
//
// Parameters:
// str - The string to be converted
//
// Returns:
// The converted string
svgedit.Utilities.toXml = function(str) {
return $('').text(str).html();
};
// Function: svgedit.Utilities.fromXml
// Converts XML entities in a string to single characters.
// Example: "&" becomes "&"
//
// Parameters:
// str - The string to be converted
//
// Returns:
// The converted string
svgedit.Utilities.fromXml = function(str) {
return $('').html(str).text();
};
// This code was written by Tyler Akins and has been placed in the
// public domain. It would be nice if you left this header intact.
// Base64 code from Tyler Akins -- http://rumkin.com
// schiller: Removed string concatenation in favour of Array.join() optimization,
// also precalculate the size of the array needed.
// Function: svgedit.Utilities.encode64
// Converts a string to base64
svgedit.Utilities.encode64 = function(input) {
// base64 strings are 4/3 larger than the original string
// input = svgedit.Utilities.encodeUTF8(input); // convert non-ASCII characters
input = svgedit.Utilities.convertToXMLReferences(input);
if(window.btoa) return window.btoa(input); // Use native if available
var output = new Array( Math.floor( (input.length + 2) / 3 ) * 4 );
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0, p = 0;
do {
chr1 = input.charCodeAt(i++);
chr2 = input.charCodeAt(i++);
chr3 = input.charCodeAt(i++);
enc1 = chr1 >> 2;
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
enc4 = chr3 & 63;
if (isNaN(chr2)) {
enc3 = enc4 = 64;
} else if (isNaN(chr3)) {
enc4 = 64;
}
output[p++] = KEYSTR.charAt(enc1);
output[p++] = KEYSTR.charAt(enc2);
output[p++] = KEYSTR.charAt(enc3);
output[p++] = KEYSTR.charAt(enc4);
} while (i < input.length);
return output.join('');
};
// Function: svgedit.Utilities.decode64
// Converts a string from base64
svgedit.Utilities.decode64 = function(input) {
if(window.atob) return window.atob(input);
var output = "";
var chr1, chr2, chr3 = "";
var enc1, enc2, enc3, enc4 = "";
var i = 0;
// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
do {
enc1 = KEYSTR.indexOf(input.charAt(i++));
enc2 = KEYSTR.indexOf(input.charAt(i++));
enc3 = KEYSTR.indexOf(input.charAt(i++));
enc4 = KEYSTR.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64) {
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64) {
output = output + String.fromCharCode(chr3);
}
chr1 = chr2 = chr3 = "";
enc1 = enc2 = enc3 = enc4 = "";
} while (i < input.length);
return unescape(output);
};
// Currently not being used, so commented out for now
// based on http://phpjs.org/functions/utf8_encode:577
// codedread:does not seem to work with webkit-based browsers on OSX
// "encodeUTF8": function(input) {
// //return unescape(encodeURIComponent(input)); //may or may not work
// var output = '';
// for (var n = 0; n < input.length; n++){
// var c = input.charCodeAt(n);
// if (c < 128) {
// output += input[n];
// }
// else if (c > 127) {
// if (c < 2048){
// output += String.fromCharCode((c >> 6) | 192);
// }
// else {
// output += String.fromCharCode((c >> 12) | 224) + String.fromCharCode((c >> 6) & 63 | 128);
// }
// output += String.fromCharCode((c & 63) | 128);
// }
// }
// return output;
// },
// Function: svgedit.Utilities.convertToXMLReferences
// Converts a string to use XML references
svgedit.Utilities.convertToXMLReferences = function(input) {
var output = '';
for (var n = 0; n < input.length; n++){
var c = input.charCodeAt(n);
if (c < 128) {
output += input[n];
}
else if(c > 127) {
output += ("&#" + c + ";");
}
}
return output;
};
// Function: rectsIntersect
// Check if two rectangles (BBoxes objects) intersect each other
//
// Paramaters:
// r1 - The first BBox-like object
// r2 - The second BBox-like object
//
// Returns:
// Boolean that's true if rectangles intersect
svgedit.Utilities.rectsIntersect = function(r1, r2) {
return r2.x < (r1.x+r1.width) &&
(r2.x+r2.width) > r1.x &&
r2.y < (r1.y+r1.height) &&
(r2.y+r2.height) > r1.y;
};
// Function: text2xml
// Cross-browser compatible method of converting a string to an XML tree
// found this function here: http://groups.google.com/group/jquery-dev/browse_thread/thread/c6d11387c580a77f
svgedit.Utilities.text2xml = function(sXML) {
if(sXML.indexOf('= 0) {
sXML = sXML.replace(/<(\/?)svg:/g, '<$1').replace('xmlns:svg', 'xmlns');
}
var out;
try{
var dXML = (window.DOMParser)?new DOMParser():new ActiveXObject("Microsoft.XMLDOM");
dXML.async = false;
} catch(e){
throw new Error("XML Parser could not be instantiated");
};
try{
if(dXML.loadXML) out = (dXML.loadXML(sXML))?dXML:false;
else out = dXML.parseFromString(sXML, "text/xml");
}
catch(e){ throw new Error("Error parsing XML string"); };
return out;
};
// Function: bboxToObj
// Converts a SVGRect into an object.
//
// Parameters:
// bbox - a SVGRect
//
// Returns:
// An object with properties names x, y, width, height.
svgedit.Utilities.bboxToObj = function(bbox) {
return {
x: bbox.x,
y: bbox.y,
width: bbox.width,
height: bbox.height
}
};
// Function: walkTree
// Walks the tree and executes the callback on each element in a top-down fashion
//
// Parameters:
// elem - DOM element to traverse
// cbFn - Callback function to run on each element
svgedit.Utilities.walkTree = function(elem, cbFn){
if (elem && elem.nodeType == 1) {
cbFn(elem);
var i = elem.childNodes.length;
while (i--) {
svgedit.Utilities.walkTree(elem.childNodes.item(i), cbFn);
}
}
};
// Function: walkTreePost
// Walks the tree and executes the callback on each element in a depth-first fashion
// TODO: FIXME: Shouldn't this be calling walkTreePost?
//
// Parameters:
// elem - DOM element to traverse
// cbFn - Callback function to run on each element
svgedit.Utilities.walkTreePost = function(elem, cbFn) {
if (elem && elem.nodeType == 1) {
var i = elem.childNodes.length;
while (i--) {
svgedit.Utilities.walkTree(elem.childNodes.item(i), cbFn);
}
cbFn(elem);
}
};
// Function: svgedit.Utilities.getUrlFromAttr
// Extracts the URL from the url(...) syntax of some attributes.
// Three variants:
// *
// *
// *
//
// Parameters:
// attrVal - The attribute value as a string
//
// Returns:
// String with just the URL, like someFile.svg#foo
svgedit.Utilities.getUrlFromAttr = function(attrVal) {
if (attrVal) {
// url("#somegrad")
if (attrVal.indexOf('url("') === 0) {
return attrVal.substring(5,attrVal.indexOf('"',6));
}
// url('#somegrad')
else if (attrVal.indexOf("url('") === 0) {
return attrVal.substring(5,attrVal.indexOf("'",6));
}
else if (attrVal.indexOf("url(") === 0) {
return attrVal.substring(4,attrVal.indexOf(')'));
}
}
return null;
};
// Function: svgedit.Utilities.getHref
// Returns the given element's xlink:href value
svgedit.Utilities.getHref = function(elem) {
return elem.getAttributeNS(XLINKNS, "href");
}
// Function: svgedit.Utilities.setHref
// Sets the given element's xlink:href value
svgedit.Utilities.setHref = function(elem, val) {
elem.setAttributeNS(XLINKNS, "xlink:href", val);
}
// Function: findDefs
// Parameters:
// svgElement - The