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svgedit/editor/svgutils.js

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/*globals $, svgedit, unescape, DOMParser, ActiveXObject, getStrokedBBox*/
/*jslint vars: true, eqeq: true, bitwise: true, continue: true, forin: true*/
/**
* Package: svgedit.utilities
*
* Licensed under the MIT License
*
* Copyright(c) 2010 Alexis Deveria
* Copyright(c) 2010 Jeff Schiller
*/
// Dependencies:
// 1) jQuery
// 2) pathseg.js
// 3) browser.js
// 4) svgtransformlist.js
// 5) units.js
(function(undef) {'use strict';
if (!svgedit.utilities) {
svgedit.utilities = {};
}
// Constants
// String used to encode base64.
var KEYSTR = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
var NS = svgedit.NS;
// Much faster than running getBBox() every time
var visElems = 'a,circle,ellipse,foreignObject,g,image,line,path,polygon,polyline,rect,svg,text,tspan,use';
var visElems_arr = visElems.split(',');
//var hidElems = 'clipPath,defs,desc,feGaussianBlur,filter,linearGradient,marker,mask,metadata,pattern,radialGradient,stop,switch,symbol,title,textPath';
var editorContext_ = null;
var domdoc_ = null;
var domcontainer_ = null;
var svgroot_ = null;
svgedit.utilities.init = function(editorContext) {
editorContext_ = editorContext;
domdoc_ = editorContext.getDOMDocument();
domcontainer_ = editorContext.getDOMContainer();
svgroot_ = editorContext.getSVGRoot();
};
// 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) {
// ' is ok in XML, but not HTML
// > does not normally need escaping, though it can if within a CDATA expression (and preceded by "]]")
return str.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/, '&#x27;');
};
// Function: svgedit.utilities.fromXml
// Converts XML entities in a string to single characters.
// Example: '&amp;' becomes '&'
//
// Parameters:
// str - The string to be converted
//
// Returns:
// The converted string
svgedit.utilities.fromXml = function(str) {
return $('<p/>').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 = [];
output.length = 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 svgedit.utilities.decodeUTF8(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 svgedit.utilities.decodeUTF8(output);
};
svgedit.utilities.decodeUTF8 = function (argString) {
return decodeURIComponent(escape(argString));
};
// codedread:does not seem to work with webkit-based browsers on OSX // Brettz9: please test again as function upgraded
svgedit.utilities.encodeUTF8 = function (argString) {
return unescape(encodeURIComponent(argString));
};
// Function: svgedit.utilities.convertToXMLReferences
// Converts a string to use XML references
svgedit.utilities.convertToXMLReferences = function(input) {
var n,
output = '';
for (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: svgedit.utilities.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('<svg:svg') >= 0) {
sXML = sXML.replace(/<(\/?)svg:/g, '<$1').replace('xmlns:svg', 'xmlns');
}
var out, dXML;
try{
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(e2){ throw new Error('Error parsing XML string'); }
return out;
};
// Function: svgedit.utilities.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: svgedit.utilities.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: svgedit.utilities.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:
// * <circle fill="url(someFile.svg#foo)" />
// * <circle fill="url('someFile.svg#foo')" />
// * <circle fill='url("someFile.svg#foo")' />
//
// 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')
if (attrVal.indexOf("url('") === 0) {
return attrVal.substring(5, attrVal.indexOf("'",6));
}
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(NS.XLINK, 'href');
};
// Function: svgedit.utilities.setHref
// Sets the given element's xlink:href value
svgedit.utilities.setHref = function(elem, val) {
elem.setAttributeNS(NS.XLINK, 'xlink:href', val);
};
// Function: findDefs
//
// Returns:
// The document's <defs> element, create it first if necessary
svgedit.utilities.findDefs = function() {
var svgElement = editorContext_.getSVGContent();
var defs = svgElement.getElementsByTagNameNS(NS.SVG, 'defs');
if (defs.length > 0) {
defs = defs[0];
} else {
defs = svgElement.ownerDocument.createElementNS(NS.SVG, 'defs');
if (svgElement.firstChild) {
// first child is a comment, so call nextSibling
svgElement.insertBefore(defs, svgElement.firstChild.nextSibling);
} else {
svgElement.appendChild(defs);
}
}
return defs;
};
// TODO(codedread): Consider moving the next to functions to bbox.js
// Function: svgedit.utilities.getPathBBox
// Get correct BBox for a path in Webkit
// Converted from code found here:
// http://blog.hackers-cafe.net/2009/06/how-to-calculate-bezier-curves-bounding.html
//
// Parameters:
// path - The path DOM element to get the BBox for
//
// Returns:
// A BBox-like object
svgedit.utilities.getPathBBox = function(path) {
var seglist = path.pathSegList;
var tot = seglist.numberOfItems;
var bounds = [[], []];
var start = seglist.getItem(0);
var P0 = [start.x, start.y];
var i;
for (i = 0; i < tot; i++) {
var seg = seglist.getItem(i);
if(seg.x === undef) {continue;}
// Add actual points to limits
bounds[0].push(P0[0]);
bounds[1].push(P0[1]);
if (seg.x1) {
var P1 = [seg.x1, seg.y1],
P2 = [seg.x2, seg.y2],
P3 = [seg.x, seg.y];
var j;
for (j = 0; j < 2; j++) {
var calc = function(t) {
return Math.pow(1-t,3) * P0[j]
+ 3 * Math.pow(1-t,2) * t * P1[j]
+ 3 * (1-t) * Math.pow(t, 2) * P2[j]
+ Math.pow(t,3) * P3[j];
};
var b = 6 * P0[j] - 12 * P1[j] + 6 * P2[j];
var a = -3 * P0[j] + 9 * P1[j] - 9 * P2[j] + 3 * P3[j];
var c = 3 * P1[j] - 3 * P0[j];
if (a == 0) {
if (b == 0) {
continue;
}
var t = -c / b;
if (0 < t && t < 1) {
bounds[j].push(calc(t));
}
continue;
}
var b2ac = Math.pow(b,2) - 4 * c * a;
if (b2ac < 0) {continue;}
var t1 = (-b + Math.sqrt(b2ac))/(2 * a);
if (0 < t1 && t1 < 1) {bounds[j].push(calc(t1));}
var t2 = (-b - Math.sqrt(b2ac))/(2 * a);
if (0 < t2 && t2 < 1) {bounds[j].push(calc(t2));}
}
P0 = P3;
} else {
bounds[0].push(seg.x);
bounds[1].push(seg.y);
}
}
var x = Math.min.apply(null, bounds[0]);
var w = Math.max.apply(null, bounds[0]) - x;
var y = Math.min.apply(null, bounds[1]);
var h = Math.max.apply(null, bounds[1]) - y;
return {
'x': x,
'y': y,
'width': w,
'height': h
};
};
// Function: groupBBFix
// Get the given/selected element's bounding box object, checking for
// horizontal/vertical lines (see issue 717)
// Note that performance is currently terrible, so some way to improve would
// be great.
//
// Parameters:
// selected - Container or <use> DOM element
function groupBBFix(selected) {
if(svgedit.browser.supportsHVLineContainerBBox()) {
try { return selected.getBBox();} catch(e){}
}
var ref = $.data(selected, 'ref');
var matched = null;
var ret, copy;
if(ref) {
copy = $(ref).children().clone().attr('visibility', 'hidden');
$(svgroot_).append(copy);
matched = copy.filter('line, path');
} else {
matched = $(selected).find('line, path');
}
var issue = false;
if(matched.length) {
matched.each(function() {
var bb = this.getBBox();
if(!bb.width || !bb.height) {
issue = true;
}
});
if(issue) {
var elems = ref ? copy : $(selected).children();
ret = getStrokedBBox(elems); // getStrokedBBox defined in svgcanvas
} else {
ret = selected.getBBox();
}
} else {
ret = selected.getBBox();
}
if(ref) {
copy.remove();
}
return ret;
}
// Function: svgedit.utilities.getBBox
// Get the given/selected element's bounding box object, convert it to be more
// usable when necessary
//
// Parameters:
// elem - Optional DOM element to get the BBox for
svgedit.utilities.getBBox = function(elem) {
var selected = elem || editorContext_.geSelectedElements()[0];
if (elem.nodeType != 1) {return null;}
var ret = null;
var elname = selected.nodeName;
switch ( elname ) {
case 'text':
if(selected.textContent === '') {
selected.textContent = 'a'; // Some character needed for the selector to use.
ret = selected.getBBox();
selected.textContent = '';
} else {
if (selected.getBBox) { ret = selected.getBBox(); }
}
break;
case 'path':
if(!svgedit.browser.supportsPathBBox()) {
ret = svgedit.utilities.getPathBBox(selected);
} else {
if (selected.getBBox) { ret = selected.getBBox(); }
}
break;
case 'g':
case 'a':
ret = groupBBFix(selected);
break;
default:
if(elname === 'use') {
ret = groupBBFix(selected, true);
}
if(elname === 'use' || ( elname === 'foreignObject' && svgedit.browser.isWebkit() ) ) {
if(!ret) {ret = selected.getBBox();}
// This is resolved in later versions of webkit, perhaps we should
// have a featured detection for correct 'use' behavior?
// ——————————
if(!svgedit.browser.isWebkit()) {
var bb = {};
bb.width = ret.width;
bb.height = ret.height;
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)) {
if (selected) { ret = selected.getBBox(); }
else {
// Check if element is child of a foreignObject
var fo = $(selected).closest('foreignObject');
if (fo.length) {
if (fo[0].getBBox) {
ret = fo[0].getBBox();
}
}
}
}
}
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;
var i;
for (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 getRefElem
// Get the reference element associated with the given attribute value
//
// Parameters:
// attrVal - The attribute value as a string
svgedit.utilities.getRefElem = function(attrVal) {
return svgedit.utilities.getElem(svgedit.utilities.getUrlFromAttr(attrVal).substr(1));
};
// 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 svgedit.NS.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) {
var i;
for (i in attrs) {
var ns = (i.substr(0,4) === 'xml:' ? NS.XML :
i.substr(0,6) === 'xlink:' ? NS.XLINK : 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]);
}
}
};
// Function: cleanupElement
// Remove unneeded (default) attributes, makes resulting SVG smaller
//
// Parameters:
// element - DOM element to clean up
svgedit.utilities.cleanupElement = function(element) {
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
};
var nodeName = element.nodeName ? element.nodeName : '';
if (nodeName == 'ellipse') {
// Ellipse elements requires rx and ry attributes
delete defaults.rx;
delete defaults.ry;
}
var attr;
for (attr in defaults) {
var val = defaults[attr];
if(element.getAttribute(attr) == val) {
element.removeAttribute(attr);
}
}
};
// Function: snapToGrid
// round value to for snapping
// NOTE: This function did not move to svgutils.js since it depends on curConfig.
svgedit.utilities.snapToGrid = function(value) {
var stepSize = editorContext_.getSnappingStep();
var unit = editorContext_.getBaseUnit();
if (unit !== "px") {
stepSize *= svgedit.units.getTypeMap()[unit];
}
value = Math.round(value/stepSize)*stepSize;
return value;
};
svgedit.utilities.preg_quote = function (str, delimiter) {
// From: http://phpjs.org/functions
return String(str).replace(new RegExp('[.\\\\+*?\\[\\^\\]$(){}=!<>|:\\' + (delimiter || '') + '-]', 'g'), '\\$&');
};
/**
* @param {string} globalCheck A global which can be used to determine if the script is already loaded
* @param {array} scripts An array of scripts to preload (in order)
* @param {function} cb The callback to execute upon load.
*/
svgedit.utilities.executeAfterLoads = function (globalCheck, scripts, cb) {
return function () {
var args = arguments;
function endCallback () {
cb.apply(null, args);
}
if (window[globalCheck]) {
endCallback();
}
else {
scripts.reduceRight(function (oldFunc, script) {
return function () {
$.getScript(script, oldFunc);
};
}, endCallback)();
}
};
};
svgedit.utilities.buildCanvgCallback = function (callCanvg) {
return svgedit.utilities.executeAfterLoads('canvg', ['canvg/rgbcolor.js', 'canvg/canvg.js'], callCanvg);
};
svgedit.utilities.buildJSPDFCallback = function (callJSPDF) {
return svgedit.utilities.executeAfterLoads('RGBColor', ['canvg/rgbcolor.js'], function () {
var arr = [];
if (!RGBColor || RGBColor.ok === undef) { // It's not our RGBColor, so we'll need to load it
arr.push('canvg/rgbcolor.js');
}
svgedit.utilities.executeAfterLoads('jsPDF', arr.concat('jspdf/underscore-min.js', 'jspdf/jspdf.min.js', 'jspdf/jspdf.plugin.svgToPdf.js'), callJSPDF)();
});
};
}());
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