e2pdf / vendors / svggraph / SliceInfo.php

SliceInfo.php in E2Pdf – Export Pdf Tool for WordPress 1.32.23, at vendors/svggraph/SliceInfo.php

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1	<?php
2	/**
3	* Copyright (C) 2019 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 details of each pie slice
26	*/
27	class SliceInfo {
28	public $start_angle;
29	public $end_angle;
30	public $radius_x;
31	public $radius_y;
32
33	public function __construct($start, $end, $rx, $ry)
34	{
35	$this->start_angle = $start;
36	$this->end_angle = $end;
37	$this->radius_x = $rx;
38	$this->radius_y = $ry;
39	}
40
41	/**
42	* Calculates the middle angle of the slice
43	*/
44	public function midAngle()
45	{
46	return $this->start_angle + ($this->end_angle - $this->start_angle) / 2;
47	}
48
49	/**
50	* Returns the slice angle in degrees
51	*/
52	public function degrees()
53	{
54	return rad2deg($this->end_angle - $this->start_angle);
55	}
56
57	/**
58	* Returns the bounding box for the slice, radius from 0,0
59	* @return array($x1, $y1, $x2, $y2)
60	*/
61	public function boundingBox($reverse)
62	{
63	$x1 = $y1 = $x2 = $y2 = 0;
64	$angle = fmod($this->end_angle - $this->start_angle, 2 * M_PI);
65	$right_angle = M_PI * 0.5;
66
67	$rx = $this->radius_x;
68	$ry = $this->radius_y;
69	$a1 = fmod($this->start_angle, 2 * M_PI);
70	$a2 = $a1 + $angle;
71	$start_sector = floor($a1 / $right_angle);
72	$end_sector = floor($a2 / $right_angle);
73
74	switch($end_sector - $start_sector) {
75
76	case 0:
77	// slice all in one sector
78	$x = max(abs(cos($a1)), abs(cos($a2))) * $rx;
79	$y = max(abs(sin($a1)), abs(sin($a2))) * $ry;
80	switch($start_sector) {
81	case 0:
82	$x2 = $x;
83	$y2 = $y;
84	break;
85	case 1:
86	$x1 = -$x;
87	$y2 = $y;
88	break;
89	case 2:
90	$x1 = -$x;
91	$y1 = -$y;
92	break;
93	case 3:
94	$x2 = $x;
95	$y1 = -$y;
96	break;
97	}
98	break;
99
100	case 1:
101	// slice across two sectors
102	switch($start_sector) {
103	case 0:
104	$x1 = cos($a2) * $rx;
105	$x2 = cos($a1) * $rx;
106	$y2 = $ry;
107	break;
108	case 1:
109	$x1 = -$rx;
110	$y1 = sin($a2) * $ry;
111	$y2 = sin($a1) * $ry;
112	break;
113	case 2:
114	$x1 = cos($a1) * $rx;
115	$x2 = cos($a2) * $rx;
116	$y1 = -$ry;
117	break;
118	case 3:
119	$x2 = $rx;
120	$y1 = sin($a1) * $ry;
121	$y2 = sin($a2) * $ry;
122	break;
123	}
124	break;
125
126	case 2:
127	// slice across three sectors
128	$x1 = -$rx;
129	$y1 = -$ry;
130	$x2 = $rx;
131	$y2 = $ry;
132	switch($start_sector) {
133	case 0:
134	$y1 = sin($a2) * $ry;
135	$x2 = cos($a1) * $rx;
136	break;
137	case 1:
138	$x2 = cos($a2) * $rx;
139	$y2 = sin($a1) * $ry;
140	break;
141	case 2:
142	$x1 = cos($a1) * $rx;
143	$y2 = sin($a2) * $ry;
144	break;
145	case 3:
146	$x1 = cos($a2) * $rx;
147	$y1 = sin($a1) * $ry;
148	break;
149	}
150	break;
151
152	case 3:
153	// slice across four sectors
154	$x = max(abs(cos($a1)), abs(cos($a2))) * $rx;
155	$y = max(abs(sin($a1)), abs(sin($a2))) * $ry;
156	$x1 = -$rx;
157	$y1 = -$ry;
158	$x2 = $rx;
159	$y2 = $ry;
160	switch($start_sector) {
161	case 0: $x2 = $x; break;
162	case 1: $y2 = $y; break;
163	case 2: $x1 = -$x; break;
164	case 3: $y1 = -$y; break;
165	}
166	break;
167
168	case 4:
169	// slice is > 270 degrees and both ends in one sector
170	$x1 = -$rx;
171	$y1 = -$ry;
172	$x2 = $rx;
173	$y2 = $ry;
174	break;
175	}
176
177	if($reverse) {
178	// swap Y around origin
179	$y = -$y1;
180	$y1 = -$y2;
181	$y2 = $y;
182	}
183	return [$x1, $y1, $x2, $y2];
184	}
185	}
186
187