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276 lines
8.5 KiB
276 lines
8.5 KiB
'use strict';
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/**
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* Pathformer
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* Beta version
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*
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* Take any SVG version 1.1 and transform
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* child elements to 'path' elements
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*
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* This code is purely forked from
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* https://github.com/Waest/SVGPathConverter
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*/
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/**
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* Class constructor
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*
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* @param {DOM|String} element Dom element of the SVG or id of it
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*/
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function Pathformer(element) {
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// Test params
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if (typeof element === 'undefined') {
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throw new Error('Pathformer [constructor]: "element" parameter is required');
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}
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// Set the element
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if (element.constructor === String) {
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element = document.getElementById(element);
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if (!element) {
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throw new Error('Pathformer [constructor]: "element" parameter is not related to an existing ID');
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}
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}
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if (element instanceof window.SVGElement ||
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element instanceof window.SVGGElement ||
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/^svg$/i.test(element.nodeName)) {
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this.el = element;
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} else {
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throw new Error('Pathformer [constructor]: "element" parameter must be a string or a SVGelement');
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}
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// Start
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this.scan(element);
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}
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/**
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* List of tags which can be transformed
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* to path elements
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*
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* @type {Array}
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*/
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Pathformer.prototype.TYPES = ['line', 'ellipse', 'circle', 'polygon', 'polyline', 'rect'];
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/**
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* List of attribute names which contain
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* data. This array list them to check if
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* they contain bad values, like percentage.
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*
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* @type {Array}
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*/
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Pathformer.prototype.ATTR_WATCH = ['cx', 'cy', 'points', 'r', 'rx', 'ry', 'x', 'x1', 'x2', 'y', 'y1', 'y2'];
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/**
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* Finds the elements compatible for transform
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* and apply the liked method
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*
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* @param {object} options Object from the constructor
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*/
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Pathformer.prototype.scan = function (svg) {
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var fn, element, pathData, pathDom,
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elements = svg.querySelectorAll(this.TYPES.join(','));
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for (var i = 0; i < elements.length; i++) {
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element = elements[i];
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fn = this[element.tagName.toLowerCase() + 'ToPath'];
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pathData = fn(this.parseAttr(element.attributes));
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pathDom = this.pathMaker(element, pathData);
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element.parentNode.replaceChild(pathDom, element);
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}
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};
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/**
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* Read `line` element to extract and transform
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* data, to make it ready for a `path` object.
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*
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* @param {DOMelement} element Line element to transform
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* @return {object} Data for a `path` element
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*/
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Pathformer.prototype.lineToPath = function (element) {
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var newElement = {},
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x1 = element.x1 || 0,
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y1 = element.y1 || 0,
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x2 = element.x2 || 0,
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y2 = element.y2 || 0;
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newElement.d = 'M' + x1 + ',' + y1 + 'L' + x2 + ',' + y2;
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return newElement;
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};
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/**
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* Read `rect` element to extract and transform
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* data, to make it ready for a `path` object.
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* The radius-border is not taken in charge yet.
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* (your help is more than welcomed)
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*
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* @param {DOMelement} element Rect element to transform
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* @return {object} Data for a `path` element
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*/
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Pathformer.prototype.rectToPath = function (element) {
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var newElement = {},
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x = parseFloat(element.x) || 0,
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y = parseFloat(element.y) || 0,
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width = parseFloat(element.width) || 0,
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height = parseFloat(element.height) || 0;
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if (element.rx || element.ry) {
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var rx = parseInt(element.rx, 10) || -1,
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ry = parseInt(element.ry, 10) || -1;
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rx = Math.min(Math.max(rx < 0 ? ry : rx, 0), width/2);
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ry = Math.min(Math.max(ry < 0 ? rx : ry, 0), height/2);
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newElement.d = 'M ' + (x + rx) + ',' + y + ' ' +
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'L ' + (x + width - rx) + ',' + y + ' ' +
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'A ' + rx + ',' + ry + ',0,0,1,' + (x + width) + ',' + (y + ry) + ' ' +
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'L ' + (x + width) + ',' + (y + height - ry) + ' ' +
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'A ' + rx + ',' + ry + ',0,0,1,' + (x + width - rx) + ',' + (y + height) + ' ' +
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'L ' + (x + rx) + ',' + (y + height) + ' ' +
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'A ' + rx + ',' + ry + ',0,0,1,' + x + ',' + (y + height - ry) + ' ' +
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'L ' + x + ',' + (y + ry) + ' ' +
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'A ' + rx + ',' + ry + ',0,0,1,' + (x + rx) + ',' + y;
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}
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else {
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newElement.d = 'M' + x + ' ' + y + ' ' +
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'L' + (x + width) + ' ' + y + ' ' +
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'L' + (x + width) + ' ' + (y + height) + ' ' +
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'L' + x + ' ' + (y + height) + ' Z';
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}
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return newElement;
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};
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/**
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* Read `polyline` element to extract and transform
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* data, to make it ready for a `path` object.
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*
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* @param {DOMelement} element Polyline element to transform
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* @return {object} Data for a `path` element
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*/
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Pathformer.prototype.polylineToPath = function (element) {
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var newElement = {},
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points = element.points.trim().split(' '),
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i, path;
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// Reformatting if points are defined without commas
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if (element.points.indexOf(',') === -1) {
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var formattedPoints = [];
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for (i = 0; i < points.length; i+=2) {
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formattedPoints.push(points[i] + ',' + points[i+1]);
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}
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points = formattedPoints;
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}
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// Generate the path.d value
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path = 'M' + points[0];
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for(i = 1; i < points.length; i++) {
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if (points[i].indexOf(',') !== -1) {
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path += 'L' + points[i];
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}
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}
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newElement.d = path;
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return newElement;
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};
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/**
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* Read `polygon` element to extract and transform
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* data, to make it ready for a `path` object.
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* This method rely on polylineToPath, because the
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* logic is similar. The path created is just closed,
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* so it needs an 'Z' at the end.
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*
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* @param {DOMelement} element Polygon element to transform
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* @return {object} Data for a `path` element
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*/
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Pathformer.prototype.polygonToPath = function (element) {
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var newElement = Pathformer.prototype.polylineToPath(element);
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newElement.d += 'Z';
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return newElement;
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};
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/**
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* Read `ellipse` element to extract and transform
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* data, to make it ready for a `path` object.
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*
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* @param {DOMelement} element ellipse element to transform
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* @return {object} Data for a `path` element
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*/
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Pathformer.prototype.ellipseToPath = function (element) {
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var newElement = {},
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rx = parseFloat(element.rx) || 0,
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ry = parseFloat(element.ry) || 0,
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cx = parseFloat(element.cx) || 0,
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cy = parseFloat(element.cy) || 0,
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startX = cx - rx,
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startY = cy,
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endX = parseFloat(cx) + parseFloat(rx),
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endY = cy;
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newElement.d = 'M' + startX + ',' + startY +
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'A' + rx + ',' + ry + ' 0,1,1 ' + endX + ',' + endY +
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'A' + rx + ',' + ry + ' 0,1,1 ' + startX + ',' + endY;
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return newElement;
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};
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/**
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* Read `circle` element to extract and transform
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* data, to make it ready for a `path` object.
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*
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* @param {DOMelement} element Circle element to transform
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* @return {object} Data for a `path` element
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*/
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Pathformer.prototype.circleToPath = function (element) {
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var newElement = {},
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r = parseFloat(element.r) || 0,
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cx = parseFloat(element.cx) || 0,
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cy = parseFloat(element.cy) || 0,
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startX = cx - r,
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startY = cy,
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endX = parseFloat(cx) + parseFloat(r),
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endY = cy;
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newElement.d = 'M' + startX + ',' + startY +
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'A' + r + ',' + r + ' 0,1,1 ' + endX + ',' + endY +
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'A' + r + ',' + r + ' 0,1,1 ' + startX + ',' + endY;
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return newElement;
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};
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/**
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* Create `path` elements form original element
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* and prepared objects
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*
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* @param {DOMelement} element Original element to transform
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* @param {object} pathData Path data (from `toPath` methods)
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* @return {DOMelement} Path element
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*/
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Pathformer.prototype.pathMaker = function (element, pathData) {
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var i, attr, pathTag = document.createElementNS('http://www.w3.org/2000/svg','path');
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for(i = 0; i < element.attributes.length; i++) {
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attr = element.attributes[i];
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if (this.ATTR_WATCH.indexOf(attr.name) === -1) {
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pathTag.setAttribute(attr.name, attr.value);
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}
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}
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for(i in pathData) {
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pathTag.setAttribute(i, pathData[i]);
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}
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return pathTag;
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};
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/**
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* Parse attributes of a DOM element to
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* get an object of attribute => value
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*
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* @param {NamedNodeMap} attributes Attributes object from DOM element to parse
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* @return {object} Object of attributes
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*/
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Pathformer.prototype.parseAttr = function (element) {
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var attr, output = {};
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for (var i = 0; i < element.length; i++) {
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attr = element[i];
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// Check if no data attribute contains '%', or the transformation is impossible
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if (this.ATTR_WATCH.indexOf(attr.name) !== -1 && attr.value.indexOf('%') !== -1) {
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throw new Error('Pathformer [parseAttr]: a SVG shape got values in percentage. This cannot be transformed into \'path\' tags. Please use \'viewBox\'.');
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}
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output[attr.name] = attr.value;
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}
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return output;
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};
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