xref: /webtrees/app/Module/FanChartModule.php (revision bd29d468ac3a5ed7a23d7dd8f300504dda83fc72) 
1<?php
2
3/**
4 * webtrees: online genealogy
5 * Copyright (C) 2022 webtrees development team
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
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 General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <https://www.gnu.org/licenses/>.
16 */
17
18declare(strict_types=1);
19
20namespace Fisharebest\Webtrees\Module;
21
22use Fig\Http\Message\RequestMethodInterface;
23use Fisharebest\Webtrees\Auth;
24use Fisharebest\Webtrees\I18N;
25use Fisharebest\Webtrees\Individual;
26use Fisharebest\Webtrees\Menu;
27use Fisharebest\Webtrees\Registry;
28use Fisharebest\Webtrees\Services\ChartService;
29use Fisharebest\Webtrees\Validator;
30use Fisharebest\Webtrees\Webtrees;
31use Psr\Http\Message\ResponseInterface;
32use Psr\Http\Message\ServerRequestInterface;
33use Psr\Http\Server\RequestHandlerInterface;
34
35use function app;
36use function array_filter;
37use function array_map;
38use function cos;
39use function deg2rad;
40use function e;
41use function gd_info;
42use function hexdec;
43use function imagecolorallocate;
44use function imagecolortransparent;
45use function imagecreate;
46use function imagedestroy;
47use function imagefilledarc;
48use function imagefilledrectangle;
49use function imagepng;
50use function imagettfbbox;
51use function imagettftext;
52use function implode;
53use function intdiv;
54use function mb_substr;
55use function ob_get_clean;
56use function ob_start;
57use function redirect;
58use function response;
59use function round;
60use function route;
61use function rtrim;
62use function sin;
63use function sqrt;
64use function strip_tags;
65use function substr;
66use function view;
67
68use const IMG_ARC_PIE;
69
70/**
71 * Class FanChartModule
72 */
73class FanChartModule extends AbstractModule implements ModuleChartInterface, RequestHandlerInterface
74{
75    use ModuleChartTrait;
76
77    protected const ROUTE_URL = '/tree/{tree}/fan-chart-{style}-{generations}-{width}/{xref}';
78
79    // Chart styles
80    private const STYLE_HALF_CIRCLE          = 2;
81    private const STYLE_THREE_QUARTER_CIRCLE = 3;
82    private const STYLE_FULL_CIRCLE          = 4;
83
84    // Defaults
85    public const    DEFAULT_STYLE       = self::STYLE_THREE_QUARTER_CIRCLE;
86    public const    DEFAULT_GENERATIONS = 4;
87    public const    DEFAULT_WIDTH       = 100;
88    protected const DEFAULT_PARAMETERS  = [
89        'style'       => self::DEFAULT_STYLE,
90        'generations' => self::DEFAULT_GENERATIONS,
91        'width'       => self::DEFAULT_WIDTH,
92    ];
93
94    // Limits
95    private const MINIMUM_GENERATIONS = 2;
96    private const MAXIMUM_GENERATIONS = 9;
97    private const MINIMUM_WIDTH       = 50;
98    private const MAXIMUM_WIDTH       = 500;
99
100    // Chart layout parameters
101    private const FONT               = Webtrees::ROOT_DIR . 'resources/fonts/DejaVuSans.ttf';
102    private const CHART_WIDTH_PIXELS = 800;
103    private const TEXT_SIZE_POINTS   = self::CHART_WIDTH_PIXELS / 120.0;
104    private const GAP_BETWEEN_RINGS  = 2;
105
106    private ChartService $chart_service;
107
108    /**
109     * FanChartModule constructor.
110     *
111     * @param ChartService $chart_service
112     */
113    public function __construct(ChartService $chart_service)
114    {
115        $this->chart_service = $chart_service;
116    }
117
118    /**
119     * Initialization.
120     *
121     * @return void
122     */
123    public function boot(): void
124    {
125        Registry::routeFactory()->routeMap()
126            ->get(static::class, static::ROUTE_URL, $this)
127            ->allows(RequestMethodInterface::METHOD_POST);
128    }
129
130    /**
131     * How should this module be identified in the control panel, etc.?
132     *
133     * @return string
134     */
135    public function title(): string
136    {
137        /* I18N: Name of a module/chart */
138        return I18N::translate('Fan chart');
139    }
140
141    /**
142     * A sentence describing what this module does.
143     *
144     * @return string
145     */
146    public function description(): string
147    {
148        /* I18N: Description of the “Fan Chart” module */
149        return I18N::translate('A fan chart of an individual’s ancestors.');
150    }
151
152    /**
153     * CSS class for the URL.
154     *
155     * @return string
156     */
157    public function chartMenuClass(): string
158    {
159        return 'menu-chart-fanchart';
160    }
161
162    /**
163     * Return a menu item for this chart - for use in individual boxes.
164     *
165     * @param Individual $individual
166     *
167     * @return Menu|null
168     */
169    public function chartBoxMenu(Individual $individual): ?Menu
170    {
171        return $this->chartMenu($individual);
172    }
173
174    /**
175     * The title for a specific instance of this chart.
176     *
177     * @param Individual $individual
178     *
179     * @return string
180     */
181    public function chartTitle(Individual $individual): string
182    {
183        /* I18N: https://en.wikipedia.org/wiki/Family_tree#Fan_chart - %s is an individual’s name */
184        return I18N::translate('Fan chart of %s', $individual->fullName());
185    }
186
187    /**
188     * A form to request the chart parameters.
189     *
190     * @param Individual                                $individual
191     * @param array<bool|int|string|array<string>|null> $parameters
192     *
193     * @return string
194     */
195    public function chartUrl(Individual $individual, array $parameters = []): string
196    {
197        return route(static::class, [
198                'xref' => $individual->xref(),
199                'tree' => $individual->tree()->name(),
200            ] + $parameters + self::DEFAULT_PARAMETERS);
201    }
202
203    /**
204     * @param ServerRequestInterface $request
205     *
206     * @return ResponseInterface
207     */
208    public function handle(ServerRequestInterface $request): ResponseInterface
209    {
210        $tree        = Validator::attributes($request)->tree();
211        $user        = Validator::attributes($request)->user();
212        $xref        = Validator::attributes($request)->isXref()->string('xref');
213        $style       = Validator::attributes($request)->isInArrayKeys($this->styles())->integer('style');
214        $generations = Validator::attributes($request)->isBetween(self::MINIMUM_GENERATIONS, self::MAXIMUM_GENERATIONS)->integer('generations');
215        $width       = Validator::attributes($request)->isBetween(self::MINIMUM_WIDTH, self::MAXIMUM_WIDTH)->integer('width');
216        $ajax        = Validator::queryParams($request)->boolean('ajax', false);
217
218        // Convert POST requests into GET requests for pretty URLs.
219        if ($request->getMethod() === RequestMethodInterface::METHOD_POST) {
220            return redirect(route(static::class, [
221                'tree'        => $tree->name(),
222                'generations' => Validator::parsedBody($request)->isBetween(self::MINIMUM_GENERATIONS, self::MAXIMUM_GENERATIONS)->integer('generations'),
223                'style'       => Validator::parsedBody($request)->isInArrayKeys($this->styles())->integer('style'),
224                'width'       => Validator::parsedBody($request)->isBetween(self::MINIMUM_WIDTH, self::MAXIMUM_WIDTH)->integer('width'),
225                'xref'        => Validator::parsedBody($request)->isXref()->string('xref'),
226             ]));
227        }
228
229        Auth::checkComponentAccess($this, ModuleChartInterface::class, $tree, $user);
230
231        $individual  = Registry::individualFactory()->make($xref, $tree);
232        $individual  = Auth::checkIndividualAccess($individual, false, true);
233
234        if ($ajax) {
235            return $this->chart($individual, $style, $width, $generations);
236        }
237
238        $ajax_url = $this->chartUrl($individual, [
239            'ajax'        => true,
240            'generations' => $generations,
241            'style'       => $style,
242            'width'       => $width,
243        ]);
244
245        return $this->viewResponse('modules/fanchart/page', [
246            'ajax_url'            => $ajax_url,
247            'generations'         => $generations,
248            'individual'          => $individual,
249            'maximum_generations' => self::MAXIMUM_GENERATIONS,
250            'minimum_generations' => self::MINIMUM_GENERATIONS,
251            'maximum_width'       => self::MAXIMUM_WIDTH,
252            'minimum_width'       => self::MINIMUM_WIDTH,
253            'module'              => $this->name(),
254            'style'               => $style,
255            'styles'              => $this->styles(),
256            'title'               => $this->chartTitle($individual),
257            'tree'                => $tree,
258            'width'               => $width,
259        ]);
260    }
261
262    /**
263     * Generate both the HTML and PNG components of the fan chart
264     *
265     * @param Individual $individual
266     * @param int        $style
267     * @param int        $width
268     * @param int        $generations
269     *
270     * @return ResponseInterface
271     */
272    protected function chart(Individual $individual, int $style, int $width, int $generations): ResponseInterface
273    {
274        $ancestors = $this->chart_service->sosaStradonitzAncestors($individual, $generations);
275
276        $width = intdiv(self::CHART_WIDTH_PIXELS * $width, 100);
277
278        switch ($style) {
279            case self::STYLE_HALF_CIRCLE:
280                $chart_start_angle = 180;
281                $chart_end_angle   = 360;
282                $height            = intdiv($width, 2);
283                break;
284
285            case self::STYLE_THREE_QUARTER_CIRCLE:
286                $chart_start_angle = 135;
287                $chart_end_angle   = 405;
288                $height            = intdiv($width * 86, 100);
289                break;
290
291            case self::STYLE_FULL_CIRCLE:
292            default:
293                $chart_start_angle = 90;
294                $chart_end_angle   = 450;
295                $height            = $width;
296                break;
297        }
298
299        // Start with a transparent image.
300        $image       = imagecreate($width, $height);
301        $transparent = imagecolorallocate($image, 0, 0, 0);
302        imagecolortransparent($image, $transparent);
303        imagefilledrectangle($image, 0, 0, $width, $height, $transparent);
304
305        // Use theme-specified colors.
306        /** @var ModuleThemeInterface $theme */
307        $theme       = app(ModuleThemeInterface::class);
308        $text_color  = $this->imageColor($image, '000000');
309        $backgrounds = [
310            'M' => $this->imageColor($image, 'b1cff0'),
311            'F' => $this->imageColor($image, 'e9daf1'),
312            'U' => $this->imageColor($image, 'eeeeee'),
313        ];
314
315        // Co-ordinates are measured from the top-left corner.
316        $center_x  = intdiv($width, 2);
317        $center_y  = $center_x;
318        $arc_width = $width / $generations / 2.0;
319
320        // Popup menus for each ancestor.
321        $html = '';
322
323        // Areas for the image map.
324        $areas = '';
325
326        for ($generation = $generations; $generation >= 1; $generation--) {
327            // Which ancestors to include in this ring. 1, 2-3, 4-7, 8-15, 16-31, etc.
328            // The end of the range is also the number of ancestors in the ring.
329            $sosa_start = 2 ** $generation - 1;
330            $sosa_end   = 2 ** ($generation - 1);
331
332            $arc_diameter = intdiv($width * $generation, $generations);
333            $arc_radius = $arc_diameter / 2;
334
335            // Draw an empty background, for missing ancestors.
336            imagefilledarc(
337                $image,
338                $center_x,
339                $center_y,
340                $arc_diameter,
341                $arc_diameter,
342                $chart_start_angle,
343                $chart_end_angle,
344                $backgrounds['U'],
345                IMG_ARC_PIE
346            );
347
348            $arc_diameter -= 2 * self::GAP_BETWEEN_RINGS;
349
350            for ($sosa = $sosa_start; $sosa >= $sosa_end; $sosa--) {
351                if ($ancestors->has($sosa)) {
352                    $individual = $ancestors->get($sosa);
353
354                    $chart_angle = $chart_end_angle - $chart_start_angle;
355                    $start_angle = $chart_start_angle + intdiv($chart_angle * ($sosa - $sosa_end), $sosa_end);
356                    $end_angle   = $chart_start_angle + intdiv($chart_angle * ($sosa - $sosa_end + 1), $sosa_end);
357                    $angle       = $end_angle - $start_angle;
358
359                    imagefilledarc(
360                        $image,
361                        $center_x,
362                        $center_y,
363                        $arc_diameter,
364                        $arc_diameter,
365                        $start_angle,
366                        $end_angle,
367                        $backgrounds[$individual->sex()] ?? $backgrounds['U'],
368                        IMG_ARC_PIE
369                    );
370
371                    // Text is written at a tangent to the arc.
372                    $text_angle = 270.0 - ($start_angle + $end_angle) / 2.0;
373
374                    $text_radius = $arc_diameter / 2.0 - $arc_width * 0.25;
375
376                    // Don't draw text right up to the edge of the arc.
377                    if ($angle === 360) {
378                        $delta = 90;
379                    } elseif ($angle === 180) {
380                        if ($generation === 1) {
381                            $delta = 20;
382                        } else {
383                            $delta = 60;
384                        }
385                    } elseif ($angle > 120) {
386                        $delta = 45;
387                    } elseif ($angle > 60) {
388                        $delta = 15;
389                    } else {
390                        $delta = 1;
391                    }
392
393                    $tx_start = $center_x + $text_radius * cos(deg2rad($start_angle + $delta));
394                    $ty_start = $center_y + $text_radius * sin(deg2rad($start_angle + $delta));
395                    $tx_end   = $center_x + $text_radius * cos(deg2rad($end_angle - $delta));
396                    $ty_end   = $center_y + $text_radius * sin(deg2rad($end_angle - $delta));
397
398                    $max_text_length = (int) sqrt(($tx_end - $tx_start) ** 2 + ($ty_end - $ty_start) ** 2);
399
400                    $text_lines = array_filter([
401                        I18N::reverseText($individual->fullName()),
402                        I18N::reverseText($individual->alternateName() ?? ''),
403                        I18N::reverseText($individual->lifespan()),
404                    ]);
405
406                    $text_lines = array_map(
407                        fn (string $line): string => $this->fitTextToPixelWidth($line, $max_text_length),
408                        $text_lines
409                    );
410
411                    $text = implode("\n", $text_lines);
412
413                    if ($generation === 1) {
414                        $ty_start -= $text_radius / 2;
415                    }
416
417                    // If PHP is compiled with --enable-gd-jis-conv, then the function
418                    // imagettftext() is modified to expect EUC-JP encoding instead of UTF-8.
419                    // Attempt to detect and convert...
420                    if (gd_info()['JIS-mapped Japanese Font Support'] ?? false) {
421                        $text = mb_convert_encoding($text, 'EUC-JP', 'UTF-8');
422                    }
423
424                    imagettftext(
425                        $image,
426                        self::TEXT_SIZE_POINTS,
427                        $text_angle,
428                        (int) $tx_start,
429                        (int) $ty_start,
430                        $text_color,
431                        static::FONT,
432                        $text
433                    );
434                    // Debug text positions by underlining first line of text
435                    //imageline($image, (int) $tx_start, (int) $ty_start, (int) $tx_end, (int) $ty_end, $backgrounds['U']);
436
437                    $areas .= '<area shape="poly" coords="';
438                    for ($deg = $start_angle; $deg <= $end_angle; $deg++) {
439                        $rad = deg2rad($deg);
440                        $areas .= round($center_x + $arc_radius * cos(deg2rad($rad)), 1) . ',';
441                        $areas .= round($center_y + $arc_radius * sin(deg2rad($rad)), 1) . ',';
442                    }
443                    for ($deg = $end_angle; $deg >= $start_angle; $deg--) {
444                        $rad = deg2rad($deg);
445                        $areas .= round($center_x + ($arc_radius - $arc_width) * cos($rad), 1) . ',';
446                        $areas .= round($center_y + ($arc_radius - $arc_width) * sin($rad), 1) . ',';
447                    }
448                    $rad = deg2rad($start_angle);
449                    $areas .= round($center_x + $arc_radius * cos($rad), 1) . ',';
450                    $areas .= round($center_y + $arc_radius * sin($rad), 1) . '"';
451
452                    $areas .= ' href="#' . e($individual->xref()) . '"';
453                    $areas .= ' alt="' . strip_tags($individual->fullName()) . '"';
454                    $areas .= ' title="' . strip_tags($individual->fullName()) . '">';
455
456                    $html  .= '<div id="' . $individual->xref() . '" class="fan_chart_menu">';
457                    $html  .= '<a href="' . e($individual->url()) . '" class="dropdown-item p-1">';
458                    $html  .= $individual->fullName();
459                    $html  .= '</a>';
460
461                    foreach ($theme->individualBoxMenu($individual) as $menu) {
462                        $link  = $menu->getLink();
463                        $class = $menu->getClass();
464                        $html .= '<a href="' . e($link) . '" class="dropdown-item p-1 ' . e($class) . '">';
465                        $html .= $menu->getLabel();
466                        $html .= '</a>';
467                    }
468
469                    $html .= '</div>';
470                }
471            }
472        }
473
474        ob_start();
475        imagepng($image);
476        imagedestroy($image);
477        $png = ob_get_clean();
478
479        return response(view('modules/fanchart/chart', [
480            'fanh'  => $height,
481            'fanw'  => $width,
482            'html'  => $html,
483            'areas' => $areas,
484            'png'   => $png,
485            'title' => $this->chartTitle($individual),
486        ]));
487    }
488
489    /**
490     * Convert a CSS color into a GD color.
491     *
492     * @param resource $image
493     * @param string   $css_color
494     *
495     * @return int
496     */
497    protected function imageColor($image, string $css_color): int
498    {
499        return imagecolorallocate(
500            $image,
501            (int) hexdec(substr($css_color, 0, 2)),
502            (int) hexdec(substr($css_color, 2, 2)),
503            (int) hexdec(substr($css_color, 4, 2))
504        );
505    }
506
507    /**
508     * This chart can display its output in a number of styles
509     *
510     * @return array<string>
511     */
512    protected function styles(): array
513    {
514        return [
515            /* I18N: layout option for the fan chart */
516            self::STYLE_HALF_CIRCLE          => I18N::translate('half circle'),
517            /* I18N: layout option for the fan chart */
518            self::STYLE_THREE_QUARTER_CIRCLE => I18N::translate('three-quarter circle'),
519            /* I18N: layout option for the fan chart */
520            self::STYLE_FULL_CIRCLE          => I18N::translate('full circle'),
521        ];
522    }
523
524    /**
525     * Fit text to a given number of pixels by either cropping to fit,
526     * or adding spaces to center.
527     *
528     * @param string $text
529     * @param int    $pixels
530     *
531     * @return string
532     */
533    protected function fitTextToPixelWidth(string $text, int $pixels): string
534    {
535        while ($this->textWidthInPixels($text) > $pixels) {
536            $text = mb_substr($text, 0, -1);
537        }
538
539        while ($this->textWidthInPixels(' ' . $text . ' ') < $pixels) {
540            $text = ' ' . $text . ' ';
541        }
542
543        // We only need the leading spaces.
544        return rtrim($text);
545    }
546
547    /**
548     * @param string $text
549     *
550     * @return int
551     */
552    protected function textWidthInPixels(string $text): int
553    {
554        $bounding_box = imagettfbbox(self::TEXT_SIZE_POINTS, 0, self::FONT, $text);
555
556        return $bounding_box[4] - $bounding_box[0];
557    }
558}
559