292 lines
7.8 KiB
JavaScript
292 lines
7.8 KiB
JavaScript
/**
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* SVGTransformList
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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) browsersupport.js
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(function() {
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if (!window.svgedit) {
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window.svgedit = {};
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}
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if (!svgedit.transformlist) {
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svgedit.transformlist = {};
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}
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var svgroot = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
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// Helper function.
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function transformToString(xform) {
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var m = xform.matrix,
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text = "";
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switch(xform.type) {
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case 1: // MATRIX
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text = "matrix(" + [m.a,m.b,m.c,m.d,m.e,m.f].join(",") + ")";
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break;
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case 2: // TRANSLATE
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text = "translate(" + m.e + "," + m.f + ")";
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break;
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case 3: // SCALE
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if (m.a == m.d) text = "scale(" + m.a + ")";
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else text = "scale(" + m.a + "," + m.d + ")";
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break;
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case 4: // ROTATE
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var cx = 0, cy = 0;
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// this prevents divide by zero
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if (xform.angle != 0) {
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var K = 1 - m.a;
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cy = ( K * m.f + m.b*m.e ) / ( K*K + m.b*m.b );
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cx = ( m.e - m.b * cy ) / K;
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}
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text = "rotate(" + xform.angle + " " + cx + "," + cy + ")";
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break;
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}
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return text;
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};
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/**
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* Map of SVGTransformList objects.
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*/
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var listMap_ = {};
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// **************************************************************************************
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// SVGTransformList implementation for Webkit
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// These methods do not currently raise any exceptions.
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// These methods also do not check that transforms are being inserted. This is basically
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// implementing as much of SVGTransformList that we need to get the job done.
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//
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// interface SVGEditTransformList {
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// attribute unsigned long numberOfItems;
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// void clear ( )
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// SVGTransform initialize ( in SVGTransform newItem )
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// SVGTransform getItem ( in unsigned long index ) (DOES NOT THROW DOMException, INDEX_SIZE_ERR)
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// SVGTransform insertItemBefore ( in SVGTransform newItem, in unsigned long index ) (DOES NOT THROW DOMException, INDEX_SIZE_ERR)
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// SVGTransform replaceItem ( in SVGTransform newItem, in unsigned long index ) (DOES NOT THROW DOMException, INDEX_SIZE_ERR)
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// SVGTransform removeItem ( in unsigned long index ) (DOES NOT THROW DOMException, INDEX_SIZE_ERR)
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// SVGTransform appendItem ( in SVGTransform newItem )
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// NOT IMPLEMENTED: SVGTransform createSVGTransformFromMatrix ( in SVGMatrix matrix );
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// NOT IMPLEMENTED: SVGTransform consolidate ( );
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// }
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// **************************************************************************************
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svgedit.transformlist.SVGTransformList = function(elem) {
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this._elem = elem || null;
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this._xforms = [];
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// TODO: how do we capture the undo-ability in the changed transform list?
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this._update = function() {
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var tstr = "";
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var concatMatrix = svgroot.createSVGMatrix();
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for (var i = 0; i < this.numberOfItems; ++i) {
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var xform = this._list.getItem(i);
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tstr += transformToString(xform) + " ";
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}
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this._elem.setAttribute("transform", tstr);
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};
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this._list = this;
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this._init = function() {
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// Transform attribute parser
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var str = this._elem.getAttribute("transform");
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if(!str) return;
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// TODO: Add skew support in future
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var re = /\s*((scale|matrix|rotate|translate)\s*\(.*?\))\s*,?\s*/;
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var arr = [];
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var m = true;
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while(m) {
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m = str.match(re);
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str = str.replace(re,'');
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if(m && m[1]) {
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var x = m[1];
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var bits = x.split(/\s*\(/);
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var name = bits[0];
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var val_bits = bits[1].match(/\s*(.*?)\s*\)/);
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val_bits[1] = val_bits[1].replace(/(\d)-/g, "$1 -");
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var val_arr = val_bits[1].split(/[, ]+/);
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var letters = 'abcdef'.split('');
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var mtx = svgroot.createSVGMatrix();
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$.each(val_arr, function(i, item) {
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val_arr[i] = parseFloat(item);
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if(name == 'matrix') {
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mtx[letters[i]] = val_arr[i];
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}
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});
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var xform = svgroot.createSVGTransform();
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var fname = 'set' + name.charAt(0).toUpperCase() + name.slice(1);
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var values = name=='matrix'?[mtx]:val_arr;
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if (name == 'scale' && values.length == 1) {
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values.push(values[0]);
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} else if (name == 'translate' && values.length == 1) {
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values.push(0);
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} else if (name == 'rotate' && values.length == 1) {
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values.push(0);
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values.push(0);
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}
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xform[fname].apply(xform, values);
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this._list.appendItem(xform);
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}
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}
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};
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this._removeFromOtherLists = function(item) {
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if (item) {
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// Check if this transform is already in a transformlist, and
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// remove it if so.
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var found = false;
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for (var id in listMap_) {
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var tl = listMap_[id];
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for (var i = 0, len = tl._xforms.length; i < len; ++i) {
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if(tl._xforms[i] == item) {
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found = true;
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tl.removeItem(i);
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break;
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}
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}
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if (found) {
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break;
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}
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}
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}
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};
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this.numberOfItems = 0;
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this.clear = function() {
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this.numberOfItems = 0;
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this._xforms = [];
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};
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this.initialize = function(newItem) {
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this.numberOfItems = 1;
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this._removeFromOtherLists(newItem);
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this._xforms = [newItem];
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};
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this.getItem = function(index) {
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if (index < this.numberOfItems && index >= 0) {
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return this._xforms[index];
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}
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throw {code: 1}; // DOMException with code=INDEX_SIZE_ERR
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};
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this.insertItemBefore = function(newItem, index) {
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var retValue = null;
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if (index >= 0) {
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if (index < this.numberOfItems) {
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this._removeFromOtherLists(newItem);
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var newxforms = new Array(this.numberOfItems + 1);
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// TODO: use array copying and slicing
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for ( var i = 0; i < index; ++i) {
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newxforms[i] = this._xforms[i];
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}
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newxforms[i] = newItem;
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for ( var j = i+1; i < this.numberOfItems; ++j, ++i) {
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newxforms[j] = this._xforms[i];
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}
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this.numberOfItems++;
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this._xforms = newxforms;
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retValue = newItem;
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this._list._update();
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}
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else {
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retValue = this._list.appendItem(newItem);
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}
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}
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return retValue;
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};
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this.replaceItem = function(newItem, index) {
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var retValue = null;
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if (index < this.numberOfItems && index >= 0) {
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this._removeFromOtherLists(newItem);
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this._xforms[index] = newItem;
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retValue = newItem;
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this._list._update();
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}
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return retValue;
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};
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this.removeItem = function(index) {
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if (index < this.numberOfItems && index >= 0) {
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var retValue = this._xforms[index];
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var newxforms = new Array(this.numberOfItems - 1);
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for (var i = 0; i < index; ++i) {
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newxforms[i] = this._xforms[i];
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}
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for (var j = i; j < this.numberOfItems-1; ++j, ++i) {
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newxforms[j] = this._xforms[i+1];
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}
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this.numberOfItems--;
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this._xforms = newxforms;
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this._list._update();
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return retValue;
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} else {
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throw {code: 1}; // DOMException with code=INDEX_SIZE_ERR
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}
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};
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this.appendItem = function(newItem) {
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this._removeFromOtherLists(newItem);
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this._xforms.push(newItem);
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this.numberOfItems++;
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this._list._update();
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return newItem;
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};
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};
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svgedit.transformlist.resetListMap = function() {
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listMap_ = {};
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};
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/**
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* Removes transforms of the given element from the map.
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* Parameters:
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* elem - a DOM Element
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*/
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svgedit.transformlist.removeElementFromListMap = function(elem) {
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if (elem.id && listMap_[elem.id]) {
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delete listMap_[elem.id];
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}
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};
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// Function: getTransformList
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// Returns an object that behaves like a SVGTransformList for the given DOM element
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//
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// Parameters:
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// elem - DOM element to get a transformlist from
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svgedit.transformlist.getTransformList = function(elem) {
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if (!svgedit.browsersupport.nativeTransformLists) {
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var id = elem.id;
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if(!id) {
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// Get unique ID for temporary element
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id = 'temp';
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}
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var t = listMap_[id];
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if (!t || id == 'temp') {
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listMap_[id] = new svgedit.transformlist.SVGTransformList(elem);
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listMap_[id]._init();
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t = listMap_[id];
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}
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return t;
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}
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else if (elem.transform) {
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return elem.transform.baseVal;
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}
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else if (elem.gradientTransform) {
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return elem.gradientTransform.baseVal;
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}
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else if (elem.patternTransform) {
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return elem.patternTransform.baseVal;
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}
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return null;
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};
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})(); |