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Viewing file:     removeOffCanvasPaths.js (3.09 KB)      -rw-r--r--

'use strict';

exports.type = 'perItem';

exports.active = false;

exports.description = 'removes elements that are drawn outside of the viewbox (disabled by default)';

var SVGO       = require('../lib/svgo.js'),
	_path      = require('./_path.js'),
	intersects = _path.intersects,
	path2js    = _path.path2js,
	viewBox,
	viewBoxJS;

/**
 * Remove elements that are drawn outside of the viewbox.
 *
 * @param {Object} item current iteration item
 * @return {Boolean} if false, item will be filtered out
 *
 * @author JoshyPHP
 */
exports.fn = function(item) {

	if (item.isElem('path') && item.hasAttr('d') && typeof viewBox !== 'undefined')
	{
		// Consider that any item with a transform attribute or a M instruction
		// within the viewBox is visible
		if (hasTransform(item) || pathMovesWithinViewBox(item.attr('d').value))
		{
			return true;
		}

		var pathJS = path2js(item);
		if (pathJS.length === 2)
		{
			// Use a closed clone of the path if it's too short for intersects()
			pathJS = JSON.parse(JSON.stringify(pathJS));
			pathJS.push({ instruction: 'z' });
		}

		return intersects(viewBoxJS, pathJS);
	}
	if (item.isElem('svg'))
	{
		parseViewBox(item);
	}

	return true;
};

/**
 * Test whether given item or any of its ancestors has a transform attribute.
 *
 * @param {String} path
 * @return {Boolean}
 */
function hasTransform(item)
{
	return item.hasAttr('transform') || (item.parentNode && hasTransform(item.parentNode));
}

/**
 * Parse the viewBox coordinates and compute the JS representation of its path.
 *
 * @param {Object} svg svg element item
 */
function parseViewBox(svg)
{
	var viewBoxData = '';
	if (svg.hasAttr('viewBox'))
	{
		// Remove commas and plus signs, normalize and trim whitespace
		viewBoxData = svg.attr('viewBox').value;
	}
	else if (svg.hasAttr('height') && svg.hasAttr('width'))
	{
		viewBoxData = '0 0 ' + svg.attr('width').value + ' ' + svg.attr('height').value;
	}

	// Remove commas and plus signs, normalize and trim whitespace
	viewBoxData = viewBoxData.replace(/[,+]|px/g, ' ').replace(/\s+/g, ' ').replace(/^\s*|\s*$/g, '');

	// Ensure that the dimensions are 4 values separated by space
	var m = /^(-?\d*\.?\d+) (-?\d*\.?\d+) (\d*\.?\d+) (\d*\.?\d+)$/.exec(viewBoxData);
	if (!m)
	{
		return;
	}

	// Store the viewBox boundaries
	viewBox = {
		left:   parseFloat(m[1]),
		top:    parseFloat(m[2]),
		right:  parseFloat(m[1]) + parseFloat(m[3]),
		bottom: parseFloat(m[2]) + parseFloat(m[4])
	};

	var path = new SVGO().createContentItem({
		elem:   'path',
		prefix: '',
		local:  'path'
	});
	path.addAttr({
		name:   'd',
		prefix: '',
		local:  'd',
		value:  'M' + m[1] + ' ' + m[2] + 'h' + m[3] + 'v' + m[4] + 'H' + m[1] + 'z'
	});

	viewBoxJS = path2js(path);
}

/**
 * Test whether given path has a M instruction with coordinates within the viewBox.
 *
 * @param {String} path
 * @return {Boolean}
 */
function pathMovesWithinViewBox(path)
{
	var regexp = /M\s*(-?\d*\.?\d+)(?!\d)\s*(-?\d*\.?\d+)/g, m;
	while (null !== (m = regexp.exec(path)))
	{
		if (m[1] >= viewBox.left && m[1] <= viewBox.right && m[2] >= viewBox.top && m[2] <= viewBox.bottom)
		{
			return true;
		}
	}

	return false;
}