e2pdf / vendors / svggraph / DonutGraphTrait.php

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

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1	<?php
2	/**
3	* Copyright (C) 2021-2022 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	trait DonutGraphTrait {
25
26	/**
27	* Returns the outer and inner angle adjustments for the slice gap
28	*/
29	public function getSliceGap($angle, $ratio)
30	{
31	$gap_angle = $this->getOption('donut_slice_gap');
32	$outer_a = $inner_a = 0;
33	if($gap_angle > 0) {
34	$a = deg2rad($gap_angle);
35	if($a < $angle * 0.5) {
36	$outer_a = 0.5 * $a;
37	$inner_a = $outer_a / $ratio;
38	}
39	}
40	return [$outer_a, $inner_a];
41	}
42
43	/**
44	* Override the parent to draw doughnut slice
45	*/
46	protected function getSlice($item, $angle_start, $angle_end, $radius_x,
47	$radius_y, &$attr, $single_slice, $colour_index)
48	{
49	$ratio = min(0.99, max(0.01, $this->getOption('inner_radius')));
50	$angle = $angle_end - $angle_start;
51
52	list($outer_a, $inner_a) = $this->getSliceGap($angle, $ratio);
53	$x_start = $y_start = $x_end = $y_end = 0;
54	$angle_start += $this->s_angle;
55	$angle_end += $this->s_angle;
56	$this->calcSlice($angle_start + $outer_a, $angle_end - $outer_a,
57	$radius_x, $radius_y, $x_start, $y_start, $x_end, $y_end);
58	$xc = $this->x_centre;
59	$yc = $this->y_centre;
60	$rx1 = $radius_x * $ratio;
61	$ry1 = $radius_y * $ratio;
62
63	if($single_slice && $this->full_angle >= M_PI * 2.0) {
64	$x1_start = $xc + $rx1;
65	$x1_end = $xc - $rx1;
66	$y1_start = $y1_end = $yc;
67	$x2_start = $xc + $radius_x;
68	$x2_end = $xc - $radius_x;
69	$y2_start = $y2_end = $yc;
70	// path with ellipses made of arcs
71	$path = new PathData('M', $x1_start, $y1_start);
72	$path->add('A', $rx1, $ry1, 0, 0, 0, $x1_end, $y1_end);
73	$path->add('A', $rx1, $ry1, 0, 0, 0, $x1_start, $y1_start);
74	$path->add('M', $x2_start, $y2_start);
75	$path->add('A', $radius_x, $radius_y, 0, 0, 0, $x2_end, $y2_end);
76	$path->add('A', $radius_x, $radius_y, 0, 0, 0, $x2_start, $y2_start);
77	$attr['d'] = $path;
78	$attr['fill-rule'] = 'evenodd';
79	} else {
80	$outer = ($angle > M_PI ? 1 : 0);
81	$sweep = ($this->getOption('reverse') ? 0 : 1);
82
83	// inner radius reduced by gap
84	$as = $angle_start + $inner_a;
85	$ae = $angle_end - $inner_a;
86	if($ae < $as)
87	$ae = $as = ($ae + $as) / 2; // not enough space, so come to a point
88
89	$this->calcSlice($as, $ae, $rx1, $ry1, $x1_start, $y1_start, $x1_end, $y1_end);
90	$isweep = $sweep ? 0 : 1;
91	$path = new PathData('M', $x1_end, $y1_end);
92	$path->add('A', $rx1, $ry1, 0, $outer, $isweep, $x1_start, $y1_start);
93	$path->add('L', $x_start, $y_start);
94	$path->add('A', $radius_x, $radius_y, 0, $outer, $sweep, $x_end, $y_end, 'z');
95	$attr['d'] = $path;
96	}
97	return $this->element('path', $attr);
98	}
99
100	/**
101	* Returns extra drawing code that goes between pie and labels
102	*/
103	protected function pieExtras()
104	{
105	$inner_text = $this->getOption('inner_text');
106	if(empty($inner_text))
107	return '';
108
109	// use content label for inner text - measurements don't really matter
110	$this->addContentLabel('innertext', 0,
111	$this->x_centre - 100, $this->y_centre - 100, 200, 200,
112	$inner_text);
113	return '';
114	}
115
116	/**
117	* Overridden to keep inner text in the middle
118	*/
119	public function dataLabelPosition($dataset, $index, &$item, $x, $y, $w, $h,
120	$label_w, $label_h)
121	{
122	if($dataset === 'innertext')
123	return ['centre middle', [$x, $y] ];
124
125	list($pos, $target) = parent::dataLabelPosition($dataset, $index, $item,
126	$x, $y, $w, $h, $label_w, $label_h);
127	if(isset($this->slice_info[$index]) && $this->getOption('label_position') <= 1) {
128	$a = $this->slice_info[$index]->midAngle();
129	$ac = $this->s_angle + $a;
130	$rx = $this->slice_info[$index]->radius_x;
131	$ry = $this->slice_info[$index]->radius_y;
132	$ring_centre = ($this->getOption('inner_radius') + 1) * 0.5;
133	$xt = $rx * $ring_centre * cos($ac);
134	$yt = ($this->getOption('reverse') ? -1 : 1) * $ry * $ring_centre * sin($ac);
135	$target = [$x + $xt, $y + $yt];
136	}
137	return [$pos, $target];
138	}
139
140	/**
141	* Returns the style options for the inner text label
142	*/
143	public function dataLabelStyle($dataset, $index, &$item)
144	{
145	$style = parent::dataLabelStyle($dataset, $index, $item);
146
147	if($dataset !== 'innertext')
148	return $style;
149
150	// label settings can override global settings
151	$opts = [
152	'font' => 'inner_text_font',
153	'font_size' => 'inner_text_font_size',
154	'font_weight' => 'inner_text_font_weight',
155	'font_adjust' => 'inner_text_font_adjust',
156	'colour' => 'inner_text_colour',
157	'back_colour' => 'inner_text_back_colour',
158	];
159	foreach($opts as $key => $opt)
160	if(isset($this->settings[$opt]) && !empty($this->settings[$opt]))
161	$style[$key] = $this->settings[$opt];
162
163	// no boxes
164	$style['type'] = 'plain';
165	return $style;
166	}
167	}
168
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