[29468] | 1 | /**
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| 2 | * SVGTransformList
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| 3 | *
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| 4 | * Licensed under the Apache License, Version 2
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| 5 | *
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| 6 | * Copyright(c) 2010 Alexis Deveria
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| 7 | * Copyright(c) 2010 Jeff Schiller
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| 8 | */
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| 9 |
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| 10 | // Dependencies:
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| 11 | // 1) browser.js
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| 12 |
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| 13 | var svgedit = svgedit || {};
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| 14 |
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| 15 | (function() {
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| 16 |
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| 17 | if (!svgedit.transformlist) {
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| 18 | svgedit.transformlist = {};
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| 19 | }
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| 20 |
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| 21 | var svgroot = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
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| 22 |
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| 23 | // Helper function.
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| 24 | function transformToString(xform) {
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| 25 | var m = xform.matrix,
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| 26 | text = "";
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| 27 | switch(xform.type) {
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| 28 | case 1: // MATRIX
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| 29 | text = "matrix(" + [m.a,m.b,m.c,m.d,m.e,m.f].join(",") + ")";
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| 30 | break;
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| 31 | case 2: // TRANSLATE
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| 32 | text = "translate(" + m.e + "," + m.f + ")";
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| 33 | break;
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| 34 | case 3: // SCALE
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| 35 | if (m.a == m.d) text = "scale(" + m.a + ")";
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| 36 | else text = "scale(" + m.a + "," + m.d + ")";
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| 37 | break;
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| 38 | case 4: // ROTATE
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| 39 | var cx = 0, cy = 0;
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| 40 | // this prevents divide by zero
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| 41 | if (xform.angle != 0) {
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| 42 | var K = 1 - m.a;
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| 43 | cy = ( K * m.f + m.b*m.e ) / ( K*K + m.b*m.b );
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| 44 | cx = ( m.e - m.b * cy ) / K;
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| 45 | }
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| 46 | text = "rotate(" + xform.angle + " " + cx + "," + cy + ")";
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| 47 | break;
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| 48 | }
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| 49 | return text;
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| 50 | };
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| 51 |
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| 52 |
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| 53 | /**
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| 54 | * Map of SVGTransformList objects.
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| 55 | */
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| 56 | var listMap_ = {};
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| 57 |
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| 58 |
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| 59 | // **************************************************************************************
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| 60 | // SVGTransformList implementation for Webkit
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| 61 | // These methods do not currently raise any exceptions.
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| 62 | // These methods also do not check that transforms are being inserted. This is basically
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| 63 | // implementing as much of SVGTransformList that we need to get the job done.
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| 64 | //
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| 65 | // interface SVGEditTransformList {
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| 66 | // attribute unsigned long numberOfItems;
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| 67 | // void clear ( )
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| 68 | // SVGTransform initialize ( in SVGTransform newItem )
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| 69 | // SVGTransform getItem ( in unsigned long index ) (DOES NOT THROW DOMException, INDEX_SIZE_ERR)
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| 70 | // SVGTransform insertItemBefore ( in SVGTransform newItem, in unsigned long index ) (DOES NOT THROW DOMException, INDEX_SIZE_ERR)
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| 71 | // SVGTransform replaceItem ( in SVGTransform newItem, in unsigned long index ) (DOES NOT THROW DOMException, INDEX_SIZE_ERR)
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| 72 | // SVGTransform removeItem ( in unsigned long index ) (DOES NOT THROW DOMException, INDEX_SIZE_ERR)
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| 73 | // SVGTransform appendItem ( in SVGTransform newItem )
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| 74 | // NOT IMPLEMENTED: SVGTransform createSVGTransformFromMatrix ( in SVGMatrix matrix );
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| 75 | // NOT IMPLEMENTED: SVGTransform consolidate ( );
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| 76 | // }
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| 77 | // **************************************************************************************
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| 78 | svgedit.transformlist.SVGTransformList = function(elem) {
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| 79 | this._elem = elem || null;
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| 80 | this._xforms = [];
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| 81 | // TODO: how do we capture the undo-ability in the changed transform list?
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| 82 | this._update = function() {
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| 83 | var tstr = "";
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| 84 | var concatMatrix = svgroot.createSVGMatrix();
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| 85 | for (var i = 0; i < this.numberOfItems; ++i) {
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| 86 | var xform = this._list.getItem(i);
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| 87 | tstr += transformToString(xform) + " ";
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| 88 | }
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| 89 | this._elem.setAttribute("transform", tstr);
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| 90 | };
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| 91 | this._list = this;
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| 92 | this._init = function() {
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| 93 | // Transform attribute parser
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| 94 | var str = this._elem.getAttribute("transform");
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| 95 | if(!str) return;
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| 96 |
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| 97 | // TODO: Add skew support in future
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| 98 | var re = /\s*((scale|matrix|rotate|translate)\s*\(.*?\))\s*,?\s*/;
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| 99 | var arr = [];
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| 100 | var m = true;
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| 101 | while(m) {
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| 102 | m = str.match(re);
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| 103 | str = str.replace(re,'');
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| 104 | if(m && m[1]) {
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| 105 | var x = m[1];
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| 106 | var bits = x.split(/\s*\(/);
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| 107 | var name = bits[0];
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| 108 | var val_bits = bits[1].match(/\s*(.*?)\s*\)/);
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| 109 | val_bits[1] = val_bits[1].replace(/(\d)-/g, "$1 -");
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| 110 | var val_arr = val_bits[1].split(/[, ]+/);
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| 111 | var letters = 'abcdef'.split('');
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| 112 | var mtx = svgroot.createSVGMatrix();
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| 113 | $.each(val_arr, function(i, item) {
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| 114 | val_arr[i] = parseFloat(item);
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| 115 | if(name == 'matrix') {
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| 116 | mtx[letters[i]] = val_arr[i];
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| 117 | }
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| 118 | });
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| 119 | var xform = svgroot.createSVGTransform();
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| 120 | var fname = 'set' + name.charAt(0).toUpperCase() + name.slice(1);
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| 121 | var values = name=='matrix'?[mtx]:val_arr;
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| 122 |
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| 123 | if (name == 'scale' && values.length == 1) {
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| 124 | values.push(values[0]);
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| 125 | } else if (name == 'translate' && values.length == 1) {
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| 126 | values.push(0);
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| 127 | } else if (name == 'rotate' && values.length == 1) {
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| 128 | values.push(0);
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| 129 | values.push(0);
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| 130 | }
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| 131 | xform[fname].apply(xform, values);
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| 132 | this._list.appendItem(xform);
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| 133 | }
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| 134 | }
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| 135 | };
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| 136 | this._removeFromOtherLists = function(item) {
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| 137 | if (item) {
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| 138 | // Check if this transform is already in a transformlist, and
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| 139 | // remove it if so.
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| 140 | var found = false;
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| 141 | for (var id in listMap_) {
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| 142 | var tl = listMap_[id];
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| 143 | for (var i = 0, len = tl._xforms.length; i < len; ++i) {
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| 144 | if(tl._xforms[i] == item) {
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| 145 | found = true;
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| 146 | tl.removeItem(i);
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| 147 | break;
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| 148 | }
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| 149 | }
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| 150 | if (found) {
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| 151 | break;
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| 152 | }
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| 153 | }
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| 154 | }
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| 155 | };
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| 156 |
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| 157 | this.numberOfItems = 0;
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| 158 | this.clear = function() {
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| 159 | this.numberOfItems = 0;
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| 160 | this._xforms = [];
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| 161 | };
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| 162 |
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| 163 | this.initialize = function(newItem) {
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| 164 | this.numberOfItems = 1;
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| 165 | this._removeFromOtherLists(newItem);
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| 166 | this._xforms = [newItem];
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| 167 | };
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| 168 |
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| 169 | this.getItem = function(index) {
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| 170 | if (index < this.numberOfItems && index >= 0) {
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| 171 | return this._xforms[index];
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| 172 | }
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| 173 | throw {code: 1}; // DOMException with code=INDEX_SIZE_ERR
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| 174 | };
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| 175 |
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| 176 | this.insertItemBefore = function(newItem, index) {
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| 177 | var retValue = null;
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| 178 | if (index >= 0) {
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| 179 | if (index < this.numberOfItems) {
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| 180 | this._removeFromOtherLists(newItem);
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| 181 | var newxforms = new Array(this.numberOfItems + 1);
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| 182 | // TODO: use array copying and slicing
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| 183 | for ( var i = 0; i < index; ++i) {
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| 184 | newxforms[i] = this._xforms[i];
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| 185 | }
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| 186 | newxforms[i] = newItem;
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| 187 | for ( var j = i+1; i < this.numberOfItems; ++j, ++i) {
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| 188 | newxforms[j] = this._xforms[i];
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| 189 | }
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| 190 | this.numberOfItems++;
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| 191 | this._xforms = newxforms;
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| 192 | retValue = newItem;
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| 193 | this._list._update();
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| 194 | }
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| 195 | else {
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| 196 | retValue = this._list.appendItem(newItem);
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| 197 | }
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| 198 | }
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| 199 | return retValue;
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| 200 | };
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| 201 |
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| 202 | this.replaceItem = function(newItem, index) {
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| 203 | var retValue = null;
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| 204 | if (index < this.numberOfItems && index >= 0) {
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| 205 | this._removeFromOtherLists(newItem);
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| 206 | this._xforms[index] = newItem;
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| 207 | retValue = newItem;
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| 208 | this._list._update();
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| 209 | }
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| 210 | return retValue;
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| 211 | };
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| 212 |
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| 213 | this.removeItem = function(index) {
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| 214 | if (index < this.numberOfItems && index >= 0) {
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| 215 | var retValue = this._xforms[index];
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| 216 | var newxforms = new Array(this.numberOfItems - 1);
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| 217 | for (var i = 0; i < index; ++i) {
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| 218 | newxforms[i] = this._xforms[i];
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| 219 | }
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| 220 | for (var j = i; j < this.numberOfItems-1; ++j, ++i) {
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| 221 | newxforms[j] = this._xforms[i+1];
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| 222 | }
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| 223 | this.numberOfItems--;
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| 224 | this._xforms = newxforms;
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| 225 | this._list._update();
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| 226 | return retValue;
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| 227 | } else {
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| 228 | throw {code: 1}; // DOMException with code=INDEX_SIZE_ERR
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| 229 | }
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| 230 | };
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| 231 |
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| 232 | this.appendItem = function(newItem) {
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| 233 | this._removeFromOtherLists(newItem);
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| 234 | this._xforms.push(newItem);
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| 235 | this.numberOfItems++;
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| 236 | this._list._update();
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| 237 | return newItem;
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| 238 | };
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| 239 | };
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| 240 |
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| 241 |
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| 242 | svgedit.transformlist.resetListMap = function() {
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| 243 | listMap_ = {};
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| 244 | };
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| 245 |
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| 246 | /**
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| 247 | * Removes transforms of the given element from the map.
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| 248 | * Parameters:
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| 249 | * elem - a DOM Element
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| 250 | */
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| 251 | svgedit.transformlist.removeElementFromListMap = function(elem) {
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| 252 | if (elem.id && listMap_[elem.id]) {
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| 253 | delete listMap_[elem.id];
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| 254 | }
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| 255 | };
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| 256 |
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| 257 | // Function: getTransformList
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| 258 | // Returns an object that behaves like a SVGTransformList for the given DOM element
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| 259 | //
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| 260 | // Parameters:
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| 261 | // elem - DOM element to get a transformlist from
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| 262 | svgedit.transformlist.getTransformList = function(elem) {
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| 263 | if (!svgedit.browser.supportsNativeTransformLists()) {
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| 264 | var id = elem.id;
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| 265 | if(!id) {
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| 266 | // Get unique ID for temporary element
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| 267 | id = 'temp';
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| 268 | }
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| 269 | var t = listMap_[id];
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| 270 | if (!t || id == 'temp') {
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| 271 | listMap_[id] = new svgedit.transformlist.SVGTransformList(elem);
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| 272 | listMap_[id]._init();
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| 273 | t = listMap_[id];
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| 274 | }
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| 275 | return t;
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| 276 | }
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| 277 | else if (elem.transform) {
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| 278 | return elem.transform.baseVal;
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| 279 | }
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| 280 | else if (elem.gradientTransform) {
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| 281 | return elem.gradientTransform.baseVal;
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| 282 | }
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| 283 | else if (elem.patternTransform) {
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| 284 | return elem.patternTransform.baseVal;
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| 285 | }
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| 286 |
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| 287 | return null;
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| 288 | };
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| 289 |
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| 290 |
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| 291 | })(); |
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