e2pdf / vendors / svggraph / Coords.php

Coords.php in E2Pdf – Export Pdf Tool for WordPress 1.32.17, at vendors/svggraph/Coords.php

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1	<?php
2	/**
3	* Copyright (C) 2015-2022 Graham Breach
4	*
5	* This program is free software: you can redistribute it and/or modify
6	* it under the terms of the GNU Lesser General Public License as published by
7	* the Free Software Foundation, either version 3 of the License, or
8	* (at your option) any later version.
9	*
10	* This program is distributed in the hope that it will be useful,
11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13	* GNU Lesser General Public License for more details.
14	*
15	* You should have received a copy of the GNU Lesser General Public License
16	* along with this program. If not, see <http://www.gnu.org/licenses/>.
17	*/
18	/**
19	* For more information, please contact <graham@goat1000.com>
20	*/
21
22	namespace Goat1000\SVGGraph;
23
24	/**
25	* Class for parsing and converting coordinates
26	*/
27	class Coords {
28
29	private $graph;
30
31	public function __construct(&$graph)
32	{
33	$this->graph =& $graph;
34	}
35
36	/**
37	* Returns TRUE if (x,y) is grid-based
38	*/
39	public function isGrid($x, $y)
40	{
41	if(is_numeric($x) && is_numeric($y))
42	return false;
43	$first = strtolower(substr($x, 0, 1));
44	if($first == 'g')
45	return true;
46	$first = strtolower(substr($y, 0, 1));
47	if($first == 'g')
48	return true;
49	return false;
50	}
51
52	/**
53	* splits $value, removing leading char and updating $axis, $axis_no
54	*/
55	private static function valueAxis(&$value, &$axis, &$axis_no)
56	{
57	if(preg_match('/^[ug](.*?)(([xy])(\d?))?$/i', $value, $matches)) {
58	$value = $matches[1];
59	if(count($matches) == 5) {
60	$axis = strtolower($matches[3]);
61	$axis_no = is_numeric($matches[4]) ? $matches[4] : null;
62	}
63	return;
64	}
65	// if the regex failed (?!) just strip leading u or g
66	$value = substr($value, 1);
67	}
68
69	/**
70	* Transform coordinate pair to SVG coords
71	*/
72	public function transformCoords($x, $y)
73	{
74	$xy = [ $this->transform($x, 'x'), $this->transform($y, 'y') ];
75	if($this->isGrid($x, $y) && method_exists($this->graph, 'transformCoords')) {
76	$xy = $this->graph->transformCoords($xy[0], $xy[1]);
77	}
78	return $xy;
79	}
80
81	/**
82	* Determines the type of value
83	*/
84	public static function parseValue($value, $axis = null)
85	{
86	$info = [
87	'value' => $value, 'axis' => $axis, 'axis_no' => null,
88	'simple' => true, 'grid' => false, 'units' => false,
89	'offset' => 0, 'offset_units' => false,
90	];
91	if(is_numeric($value) \|\| !is_string($value))
92	return $info;
93
94	$info['simple'] = false;
95	$first = strtolower(substr($value, 0, 1));
96	if($first == 'u' \|\| $first == 'g') {
97	Coords::valueAxis($value, $axis, $axis_no);
98	$info['value'] = $value;
99	$info['axis'] = $axis;
100	$info['axis_no'] = $axis_no;
101	$info['grid'] = true;
102	$info['units'] = ($first == 'u');
103	$first = strtolower(substr($value, 0, 1));
104	}
105
106	// check for offset from relative position
107	if(!$info['units'] && in_array($first, ['t','l','b','r','h','w','c']) &&
108	preg_match('/(.+)([-+][0-9.]+)(u?)/', $info['value'], $matches)) {
109	$info['value'] = $matches[1];
110	$info['offset'] = $matches[2];
111	$info['offset_units'] = ($matches[3] == 'u' \|\| $matches[3] == 'U');
112	}
113	return $info;
114	}
115
116	/**
117	* Transform from grid space etc. to SVG space
118	*/
119	public function transform($value, $axis, $default_pos = 0, $measure_from = 0)
120	{
121	$v_info = Coords::parseValue($value, $axis);
122	if($v_info['simple'])
123	return $value;
124
125	$value = $v_info['value'];
126	if($v_info['grid'] && !method_exists($this->graph, 'gridX'))
127	throw new \Exception('Invalid dimensions (non-grid graph)');
128
129	if($v_info['units']) {
130	$axis_inst = $this->graph->getAxis($v_info['axis'], $v_info['axis_no']);
131	return $axis_inst->measureUnits($measure_from, $value);
132	}
133
134	$dim = $this->graph->getDimensions();
135
136	// try value as assoc/datetime key first
137	if($v_info['grid']) {
138	$axis_inst = $this->graph->getAxis($v_info['axis'], $v_info['axis_no']);
139	$position = $axis_inst->positionByKey($value);
140	if($position !== null) {
141	if($v_info['axis'] == 'x')
142	return $position + $dim['pad_left'];
143	return $axis_inst->reversed() ?
144	$dim['height'] - $dim['pad_bottom'] - $position :
145	$position + $dim['pad_top'];
146	}
147	}
148
149	if(is_numeric($value)) {
150	if($v_info['grid']) {
151	$func = $axis == 'x' ? 'gridX' : 'gridY';
152	return $this->graph->{$func}($value, $v_info['axis_no']);
153	}
154	return $value;
155	}
156
157	if($value == 'c')
158	$value .= $axis;
159	$pos = $v_info['grid'] ? $this->getGridPosition($value, $default_pos) :
160	$this->getGraphPosition($value, $default_pos);
161
162	// handle offset from relative position
163	if($v_info['offset']) {
164	if($v_info['offset_units']) {
165	$axis_inst = $this->graph->getAxis($v_info['axis'], $v_info['axis_no']);
166	$pos += $axis_inst->measureUnits($measure_from, $v_info['offset']);
167	} else {
168	$pos += $v_info['offset'];
169	}
170	}
171	return $pos;
172	}
173
174	/**
175	* Converts a grid position to a number
176	*/
177	public function getGridPosition($pos, $default_pos)
178	{
179	$dim = $this->graph->getDimensions();
180	switch($pos) {
181	case 't' : return $dim['pad_top'];
182	case 'l' : return $dim['pad_left'];
183	case 'b' : return $dim['height'] - $dim['pad_bottom'];
184	case 'r' : return $dim['width'] - $dim['pad_right'];
185	case 'h' : return $dim['height'] - $dim['pad_bottom'] - $dim['pad_top'];
186	case 'w' : return $dim['width'] - $dim['pad_right'] - $dim['pad_left'];
187	case 'cx' : return ($dim['width'] - $dim['pad_right'] + $dim['pad_left']) / 2;
188	case 'cy' : return ($dim['height'] - $dim['pad_bottom'] + $dim['pad_top']) / 2;
189	}
190	return $default_pos;
191	}
192
193	/**
194	* Converts a graph position to a number
195	*/
196	public function getGraphPosition($pos, $default_pos)
197	{
198	$dim = $this->graph->getDimensions();
199	switch($pos) {
200	case 't' : return 0;
201	case 'l' : return 0;
202	case 'b' : return $dim['height'];
203	case 'r' : return $dim['width'];
204	case 'h' : return $dim['height'];
205	case 'w' : return $dim['width'];
206	case 'cx' : return $dim['width'] / 2;
207	case 'cy' : return $dim['height'] / 2;
208	}
209	return $default_pos;
210	}
211	}
212
213