252 lines
6.7 KiB
JavaScript
252 lines
6.7 KiB
JavaScript
/**
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* SVG-edit 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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// NOTE: Requires jQuery to be loaded.
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SVGEditUtilities = {
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};
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// String used to encode base64.
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SVGEditUtilities._keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
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// Function: SVGEditUtilities.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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SVGEditUtilities.toXml = function(str) {
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return $('<p/>').text(str).html();
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};
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// Function: SVGEditUtilities.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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SVGEditUtilities.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: Utils.encode64
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// Converts a string to base64
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SVGEditUtilities.encode64 = function(input) {
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// base64 strings are 4/3 larger than the original string
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// input = Utils.encodeUTF8(input); // convert non-ASCII characters
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input = Utils.convertToXMLReferences(input);
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if(window.btoa) return window.btoa(input); // Use native if available
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var _keyStr = SVGEditUtilities._keyStr;
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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: Utils.decode64
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// Converts a string from base64
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SVGEditUtilities.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: Utils.convertToXMLReferences
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// Converts a string to use XML references
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SVGEditUtilities.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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}
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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: rectsIntersect
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// Check if two rectangles (BBoxes objects) intersect each other
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//
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// Paramaters:
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// r1 - The first BBox-like object
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// r2 - The second BBox-like object
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//
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// Returns:
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// Boolean that's true if rectangles intersect
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SVGEditUtilities.rectsIntersect = function(r1, r2) {
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return r2.x < (r1.x+r1.width) &&
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(r2.x+r2.width) > r1.x &&
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r2.y < (r1.y+r1.height) &&
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(r2.y+r2.height) > r1.y;
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};
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// Function: snapToAngle
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// Returns a 45 degree angle coordinate associated with the two given
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// coordinates
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//
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// Parameters:
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// x1 - First coordinate's x value
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// x2 - Second coordinate's x value
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// y1 - First coordinate's y value
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// y2 - Second coordinate's y value
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//
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// Returns:
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// Object with the following values:
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// x - The angle-snapped x value
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// y - The angle-snapped y value
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// snapangle - The angle at which to snap
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SVGEditUtilities.snapToAngle = function(x1,y1,x2,y2) {
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var snap = Math.PI/4; // 45 degrees
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var dx = x2 - x1;
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var dy = y2 - y1;
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var angle = Math.atan2(dy,dx);
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var dist = Math.sqrt(dx * dx + dy * dy);
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var snapangle= Math.round(angle/snap)*snap;
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var x = x1 + dist*Math.cos(snapangle);
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var y = y1 + dist*Math.sin(snapangle);
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//console.log(x1,y1,x2,y2,x,y,angle)
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return {x:x, y:y, a:snapangle};
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},
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// Function: 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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SVGEditUtilities.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: 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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SVGEditUtilities.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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