134 lines
3.1 KiB
JavaScript
134 lines
3.1 KiB
JavaScript
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'use strict';
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exports.type = 'perItem';
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exports.active = false;
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exports.description = 'removes elements that are drawn outside of the viewbox (disabled by default)';
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var SVGO = require('../lib/svgo.js'),
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_path = require('./_path.js'),
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intersects = _path.intersects,
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path2js = _path.path2js,
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viewBox,
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viewBoxJS;
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/**
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* Remove elements that are drawn outside of the viewbox.
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*
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* @param {Object} item current iteration item
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* @return {Boolean} if false, item will be filtered out
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*
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* @author JoshyPHP
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*/
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exports.fn = function(item) {
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if (item.isElem('path') && item.hasAttr('d') && typeof viewBox !== 'undefined')
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{
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// Consider that any item with a transform attribute or a M instruction
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// within the viewBox is visible
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if (hasTransform(item) || pathMovesWithinViewBox(item.attr('d').value))
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{
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return true;
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}
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var pathJS = path2js(item);
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if (pathJS.length === 2)
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{
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// Use a closed clone of the path if it's too short for intersects()
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pathJS = JSON.parse(JSON.stringify(pathJS));
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pathJS.push({ instruction: 'z' });
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}
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return intersects(viewBoxJS, pathJS);
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}
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if (item.isElem('svg'))
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{
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parseViewBox(item);
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}
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return true;
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};
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/**
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* Test whether given item or any of its ancestors has a transform attribute.
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*
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* @param {String} path
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* @return {Boolean}
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*/
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function hasTransform(item)
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{
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return item.hasAttr('transform') || (item.parentNode && hasTransform(item.parentNode));
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}
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/**
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* Parse the viewBox coordinates and compute the JS representation of its path.
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*
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* @param {Object} svg svg element item
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*/
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function parseViewBox(svg)
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{
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var viewBoxData = '';
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if (svg.hasAttr('viewBox'))
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{
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// Remove commas and plus signs, normalize and trim whitespace
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viewBoxData = svg.attr('viewBox').value;
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}
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else if (svg.hasAttr('height') && svg.hasAttr('width'))
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{
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viewBoxData = '0 0 ' + svg.attr('width').value + ' ' + svg.attr('height').value;
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}
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// Remove commas and plus signs, normalize and trim whitespace
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viewBoxData = viewBoxData.replace(/[,+]|px/g, ' ').replace(/\s+/g, ' ').replace(/^\s*|\s*$/g, '');
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// Ensure that the dimensions are 4 values separated by space
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var m = /^(-?\d*\.?\d+) (-?\d*\.?\d+) (\d*\.?\d+) (\d*\.?\d+)$/.exec(viewBoxData);
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if (!m)
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{
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return;
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}
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// Store the viewBox boundaries
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viewBox = {
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left: parseFloat(m[1]),
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top: parseFloat(m[2]),
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right: parseFloat(m[1]) + parseFloat(m[3]),
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bottom: parseFloat(m[2]) + parseFloat(m[4])
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};
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var path = new SVGO().createContentItem({
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elem: 'path',
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prefix: '',
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local: 'path'
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});
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path.addAttr({
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name: 'd',
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prefix: '',
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local: 'd',
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value: 'M' + m[1] + ' ' + m[2] + 'h' + m[3] + 'v' + m[4] + 'H' + m[1] + 'z'
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});
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viewBoxJS = path2js(path);
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}
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/**
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* Test whether given path has a M instruction with coordinates within the viewBox.
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*
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* @param {String} path
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* @return {Boolean}
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*/
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function pathMovesWithinViewBox(path)
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{
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var regexp = /M\s*(-?\d*\.?\d+)(?!\d)\s*(-?\d*\.?\d+)/g, m;
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while (null !== (m = regexp.exec(path)))
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{
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if (m[1] >= viewBox.left && m[1] <= viewBox.right && m[2] >= viewBox.top && m[2] <= viewBox.bottom)
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{
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return true;
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}
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}
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return false;
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}
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