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Diffstat (limited to 'lib/classes/InstituteCalendarHelper.class.php')
| -rw-r--r-- | lib/classes/InstituteCalendarHelper.class.php | 814 |
1 files changed, 0 insertions, 814 deletions
diff --git a/lib/classes/InstituteCalendarHelper.class.php b/lib/classes/InstituteCalendarHelper.class.php deleted file mode 100644 index 9412a34..0000000 --- a/lib/classes/InstituteCalendarHelper.class.php +++ /dev/null @@ -1,814 +0,0 @@ -<?php - -/** - * InstituteCalendarHelper.class.php - class for institute calendar convenience functions - * - * @author Timo Hartge <hartge@data-quest> - * @license http://www.gnu.org/licenses/gpl-2.0.html GPL version 2 - * @category Stud.IP - * - */ - -class InstituteCalendarHelper -{ - const COLUMN_DATAFIELD_ID = '69f6485f3c937766866a03d9d642ecbb'; - const COLOR_DATAFIELD_ID = '41cda2be71fe9efd6e28b853fc0681f3'; - const INST_DEFAULT_COLOR_DATAFIELD_ID = '0c63321a8e93b3ccc927611709248e07'; - const DEFAULT_EVENT_COLOR = '#899ab9'; - - /** - * Returns the default calendar columns. - * - * @return array default column names - */ - private static function getDefaultColumns() - { - return [ - 1 => ['Spalte 1', 1], - 2 => ['Spalte 2', 1], - 3 => ['Spalte 3', 1], - 4 => ['Spalte 4', 1], - 5 => ['Spalte 5', 1], - 6 => ['Spalte 6', 1] - ]; - } - - /** - * Fetches the stores columns merged with defaults. - * - * @param string $institut_id - * @param boolean $only_visible only return visible columns - * - * @return array column array in a fullcalender expected format - */ - public static function getResourceColumns($institut_id, $only_visible = false) - { - /* - returns the columns in following format: - $columns = [ - ['id' => '0', 'title' => 'Sammelspalte'], - ['id' => '1', 'title' => 'Spalte 1'] - ]; - */ - - $columns = []; - $inst_columns = [ - 0 => ['Sammelspalte', 1] - ]; - - $db_inst_columns = InstitutePlanColumn::findByInstitute($institut_id); - - if ($db_inst_columns) { - foreach ($db_inst_columns as $col_info) { - $inst_columns[$col_info['column']] = [$col_info['name'], $col_info['visible']]; - } - } else { - $inst_columns = array_merge($inst_columns, self::getDefaultColumns()); - } - foreach ($inst_columns as $id => $info) { - if ($only_visible && !$info[1]) continue; - $columns[] = ['id' => $id, 'title' => $info[0], 'visible' => $info[1]]; - } - return $columns; - } - - /** - * Adds the default resource columns - * - * @param string $institut_id - * - * @return int last resource column number - */ - public static function addDefaultResourceColumns($institut_id) - { - $max_col = 0; - foreach (self::getDefaultColumns() as $col_id => $col_info) { - $new_col = new InstitutePlanColumn([$institut_id, $col_id]); - $new_col->name = $col_info[0]; - $new_col->visible = $col_info[1]; - if ($new_col->store()) { - $max_col = $col_id; - } - } - return $max_col; - } - - /** - * Adds a resource column - * - * @param string $institut_id - * @param string $name - * @param int $specific_column_number - * - * @return int number of affected rows - */ - public static function addResourceColumn($institut_id, $name, $specific_column_number = 0) - { - $last_col = InstitutePlanColumn::getLastColumnOfInstitute($institut_id); - if ($last_col !== null) { - $max_col = $last_col->column; - } else { - $max_col = self::addDefaultResourceColumns($institut_id); - } - $column_number = $specific_column_number>0?$specific_column_number:intval($max_col)+1; - $new_col = new InstitutePlanColumn([$institut_id, $column_number]); - $new_col->name = $name; - $new_col->visible = 1; - return $new_col->store(); - } - - /** - * Looks up column id for course events - * - * @param Course $course - * - * @return array course events with column id - */ - public static function getCourseEventcolumns(Course $course) - { - $df = DatafieldEntryModel::findByModel($course, self::COLUMN_DATAFIELD_ID); - if ($df[0] && $df[0]->content) { - $event_columns = unserialize($df[0]->content); - } else { - $event_columns = []; - } - return $event_columns; - } - - /** - * Sets the column id for course events - * - * @param Course $course - * @param string $event_id SeminarCycleDate id - * @param string $institut_id - * @param string $column number of the column - * - * @return bool stored - */ - public static function setCourseEventcolumn($course, $event_id, $institut_id, $column) - { - $df = DatafieldEntryModel::findByModel($course, self::COLUMN_DATAFIELD_ID); - if ($df[0]) { - $event_columns = self::getCourseEventcolumns($course); - if (!is_array($event_columns[$event_id])) { - unset($event_columns[$event_id]); - } - $event_columns[$event_id][$institut_id] = $column; - $df[0]->content = serialize($event_columns); - return $df[0]->store(); - } - return false; - } - - /** - * Looks up color value for course events - * - * @param Course $course - * - * @return array course events with color value - */ - public static function getCourseEventcolors($course) - { - $df = DatafieldEntryModel::findByModel($course, self::COLOR_DATAFIELD_ID); - if ($df[0] && $df[0]->content) { - $event_colors = unserialize($df[0]->content); - } else { - $event_colors = []; - } - return $event_colors; - } - - /** - * Sets color value for course events - * - * @param Course $course - * @param string $event_id SeminarCycleDate id - * @param string $institut_id - * @param string $color colorcode - * - * @return bool stored - */ - public static function setCourseEventcolor($course, $event_id, $institut_id, $color) - { - $df = DatafieldEntryModel::findByModel($course, self::COLOR_DATAFIELD_ID); - if ($df[0]) { - $event_colors = self::getCourseEventcolors($course); - if (!is_array($event_colors[$event_id])) { - unset($event_colors[$event_id]); - } - $event_colors[$event_id][$institut_id] = $color; - $df[0]->content = serialize($event_colors); - return $df[0]->store(); - } - return false; - } - - /** - * Looks up default color value for institute course events - * - * @param Course $course - * - * @return array course events with color value - */ - public static function getInstituteDefaultEventcolors($institut) - { - $df = DatafieldEntryModel::findByModel($institut, self::INST_DEFAULT_COLOR_DATAFIELD_ID); - if ($df && $df[0]->content) { - $event_colors = unserialize($df[0]->content); - } else { - $event_colors = []; - } - return $event_colors; - } - - /** - * Sets default institute course events color value for semtypes - * - * @param Institut $institut - * @param string $semtype - * @param string $color colorcode - * - * @return bool stored - */ - public static function setInstituteDefaultEventcolor($institut, $semtype, $color) - { - $df = DatafieldEntryModel::findByModel($institut, self::INST_DEFAULT_COLOR_DATAFIELD_ID); - if ($df[0]) { - $event_colors = self::getInstituteDefaultEventcolors($institut); - $event_colors[$semtype['name']] = $color; - $df[0]->content = serialize($event_colors); - return $df[0]->store(); - } - return false; - } - - /** - * Sets color value for every course events of given courses semtype - * - * @param Course $course - * @param string $institut_id - * @param string $color colorcode - * - * @return bool stored - */ - public static function setSemtypeEventcolor($course, $institut_id, $color) - { - $semtype = $course->getSemType(); - $institut = Institute::find($institut_id); - if ($institut) { - self::setInstituteDefaultEventcolor($institut, $semtype, $color); - } - $courses = Course::findBySQL('status =? AND Institut_id=?', [$semtype['id'], $course->institut_id]); - if ($courses) { - foreach ($courses as $semtype_course) { - foreach (SeminarCycleDate::findBySeminar($semtype_course->seminar_id) as $cycle_date) { - self::setCourseEventcolor($semtype_course, $cycle_date->id, $institut_id, $color); - } - } - return true; - } - return false; - } - - /** - * Prepares an array of course id and names for creation of dropable calendar events - * - * @param array $courses Array of courses - * @param array $semester Semester - * - * @return array prepared array - */ - public static function getEventlessCourses($courses, $semester = null) - { - $eventless = []; - foreach (array_keys($courses) as $cid) { - $course = Course::find($cid); - $cycle_dates = SeminarCycleDate::findBySeminar($course->seminar_id); - if (count($cycle_dates) < 1) { - $eventless[$cid] = $course->getFullName('number-name'); - } elseif ($semester) { - $has_date_in_semester = false; - foreach ($cycle_dates as $cycle_date) { - foreach ($cycle_date->getAllDates() as $course_date) { - if ($course_date->date >= $semester->beginn && $course_date->date <= $semester->ende) { - $has_date_in_semester = true; - break; - } - } - if ($has_date_in_semester) break; - } - if (!$has_date_in_semester) { - $eventless[$cid] = $course->getFullName('number-name'); - } - } - } - return $eventless; - } - - /** - * Creates FullCalendar event date of course events - * - * @param array $courses Array of courses - * @param string $institut_id - * @param array $semester Semester - * @param array $specific_weekday fetch only events for specific weekday - * - * @return array fullcalendar events - */ - public static function getEvents($courses, $institut_id, $semester = null, $specific_weekday = null) - { - $events = []; - $today = date('w'); - - $user_insts = array_map(function ($arr) { - return $arr['Institut_id']; - }, Institute::getMyInstitutes($GLOBALS['user']->id)); - - $min_time = explode(':', Config::get()->INSTITUTE_COURSE_PLAN_START_HOUR); - $minbigtime = (int) $min_time[0]; - $max_time = explode(':', Config::get()->INSTITUTE_COURSE_PLAN_END_HOUR); - $maxbigtime = (int) $max_time[0]; - - $institut = Institute::find($institut_id); - $inst_default_colors = self::getInstituteDefaultEventcolors($institut); - - Course::findAndMapMany(function ($course) use ( - $courses, - &$events, - $today, - $minbigtime, - $maxbigtime, - $user_insts, - $institut_id, - $inst_default_colors, - $semester, - $specific_weekday - ) { - $semtype = $course->getSemType(); - - $event_columns = self::getCourseEventcolumns($course) ?: []; - $event_colors = self::getCourseEventcolors($course) ?: []; - - if (in_array($course->institut_id, $user_insts)) { - $is_editable = true; - $is_start_editable = !LockRules::Check($course->id, 'room_time'); - $is_duration_editable = false; - } else { - $is_editable = false; - $is_start_editable = false; - $is_duration_editable = false; - } - - foreach (SeminarCycleDate::findBySeminar($course->seminar_id) as $cycle_date) { - if ($semester) { - $has_date_in_semester = false; - foreach ($cycle_date->getAllDates() as $course_date) { - if ($course_date->date >= $semester->beginn && $course_date->date <= $semester->ende) { - $has_date_in_semester = true; - break; - } - } - if (!$has_date_in_semester) { - continue; - } - } - - if (is_numeric($specific_weekday) && $specific_weekday != $cycle_date['weekday']) { - continue; - } - - $conform = true; - - if ($cycle_date['weekday'] == 0) { - $day_offset = 7 - $today; - } else { - $day_offset = $cycle_date['weekday'] - $today; - } - - $start_time = explode(':', $cycle_date['start_time']); - $bigtime = (int) $start_time[0]; - if ($bigtime > $maxbigtime || $bigtime < $minbigtime) { - $conform = false; - } elseif ($bigtime % 2) { - $bigtime--; - } - $start_time = $bigtime . ':00:00'; - - $end_time = explode(':', $start_time); - $end_time[0] += 2; - $end_time = implode(':', $end_time); - - $move_url = URLHelper::getURL('dispatch.php/admin/courseplanning/move_event'); - $name = $course->getFullName('number-name'); - - if ($start_time != $cycle_date['start_time'] && $end_time != $cycle_date['end_time']) { - $start = self::iso8601date(strtotime($day_offset . ' days'), $cycle_date['start_time']); - $end = self::iso8601date(strtotime($day_offset . ' days'), $cycle_date['end_time']); - $backgroundcolor = '#6c737a'; - $textcolor = '#ffffff'; - } else { - $start = self::iso8601date(strtotime($day_offset . ' days'), $start_time); - $end = self::iso8601date(strtotime($day_offset . ' days'), $end_time); - - $backgroundcolor = null; - if (array_key_exists($cycle_date->id, $event_colors)) { - if (is_array($event_colors[$cycle_date->id]) && array_key_exists($institut_id, $event_colors[$cycle_date->id])) { - $backgroundcolor = $event_colors[$cycle_date->id][$institut_id]; - } - } - if (!$backgroundcolor) { - $backgroundcolor = array_key_exists($semtype['name'], $inst_default_colors) - ? $inst_default_colors[$semtype['name']] - : self::DEFAULT_EVENT_COLOR; - } - - $textcolor = '#ffffff'; - if (self::calculateLuminosityRatio($backgroundcolor, $textcolor) < 3) { - $textcolor = '#000000'; - } - } - if (!$is_editable) { - $backgroundcolor = '#c4c7c9'; - $textcolor = '#000000'; - } - - $resource_column = '0'; - if (array_key_exists($cycle_date->id, $event_columns)) { - if (is_array($event_columns[$cycle_date->id]) && array_key_exists($institut_id, $event_columns[$cycle_date->id])) { - $resource_column = $event_columns[$cycle_date->id][$institut_id]; - } - } - - $events[] = [ - 'resourceId' => $resource_column, - 'id' => $cycle_date->id, - 'title' => $name, - 'start' => $start, - 'end' => $end, - 'textColor' => $textcolor, - 'backgroundColor' => $backgroundcolor, - 'borderColor' => '#000', - 'editable' => $is_editable, - 'startEditable' => $is_start_editable, - 'durationEditable' => $is_duration_editable, - 'resourceEditable' => true, - 'studip_api_urls' => ['move' => $move_url], - 'studip_view_urls' => ['edit' => URLHelper::getURL('dispatch.php/course/details/index/' . $cycle_date->seminar_id)], - 'metadate_id' => $cycle_date->metadate_id, - 'course_id' => $cycle_date->seminar_id, - 'tooltip' => self::getCycleInfos($course, $cycle_date), - 'icon' => $is_start_editable ? '' : 'lock-locked', - 'conform' => $conform, - ]; - } - }, array_keys($courses)); - - return $events; - } - - /** - * Creates a fullcalendar event of given SeminarCycleDate - * - * @param SeminarCycleDate $cycle_date - * @param string $institut_id - * - * @return string enriched course info string for tooltip - */ - public static function getCycleEvent($cycle_date, $institut_id) - { - $course = Course::find($cycle_date->seminar_id); - $semtype = $course->getSemType(); - $institut = Institute::find($institut_id); - $inst_default_colors = self::getInstituteDefaultEventcolors($institut); - - $today = date('w'); - $user_insts = array_map(function ($arr) { - return $arr['Institut_id']; - }, Institute::getMyInstitutes($GLOBALS['user']->id)); - - $min_time = explode(':', Config::get()->INSTITUTE_COURSE_PLAN_START_HOUR); - $minbigtime = (int) $min_time[0]; - $max_time = explode(':', Config::get()->INSTITUTE_COURSE_PLAN_END_HOUR); - $maxbigtime = (int) $max_time[0]; - - $start_time = explode(':', $cycle_date['start_time']); - $bigtime = (int) $start_time[0]; - - if ($bigtime > $maxbigtime || $bigtime < $minbigtime) { - return null; - } elseif ($bigtime % 2) { - $bigtime--; - } - $start_time = $bigtime . ':00:00'; - - $end_time = explode(':', $start_time); - $end_time[0] += 2; - $end_time = implode(':', $end_time); - - if (in_array($course->institut_id, $user_insts)) { - $is_editable = true; - $is_start_editable = !LockRules::Check($cycle_date->seminar_id, 'room_time'); - $is_duration_editable = false; - } else { - $is_editable = false; - $is_start_editable = false; - $is_duration_editable = false; - } - - if ($cycle_date['weekday'] == 0) { - $day_offset = (7 - $today); - } else { - $day_offset = ($cycle_date['weekday'] - $today); - } - - $event_columns = self::getCourseEventcolumns($course); - $event_colors = self::getCourseEventcolors($course); - - $move_url = URLHelper::getURL('dispatch.php/admin/courseplanning/move_event'); - $name = $course->getFullName('number-name'); - - if ($start_time != $cycle_date['start_time'] && $end_time != $cycle_date['end_time']) { - $start = self::iso8601date(strtotime($day_offset . ' days'), $cycle_date['start_time']); - $end = self::iso8601date(strtotime($day_offset . ' days'), $cycle_date['end_time']); - $backgroundcolor = '#6c737a'; - $textcolor = '#ffffff'; - } else { - $start = self::iso8601date(strtotime($day_offset . ' days'), $start_time); - $end = self::iso8601date(strtotime($day_offset . ' days'), $end_time); - - $backgroundcolor = null; - if (array_key_exists($cycle_date->id, $event_colors)) { - if (is_array($event_colors[$cycle_date->id]) && array_key_exists($institut_id, $event_colors[$cycle_date->id])) { - $backgroundcolor = $event_colors[$cycle_date->id][$institut_id]; - } - } - if (!$backgroundcolor) { - $backgroundcolor = array_key_exists($semtype['name'], $inst_default_colors)?$inst_default_colors[$semtype['name']]:self::DEFAULT_EVENT_COLOR; - } - - $textcolor = '#ffffff'; - if (self::calculateLuminosityRatio($backgroundcolor, $textcolor) < 3) { - $textcolor = '#000000'; - } - } - if (!$is_editable) { - $backgroundcolor = '#c4c7c9'; - $textcolor = '#000000'; - } - - $resource_column = '0'; - if (array_key_exists($cycle_date->id, $event_columns)) { - if (is_array($event_columns[$cycle_date->id]) && array_key_exists($institut_id, $event_columns[$cycle_date->id])) { - $resource_column = $event_columns[$cycle_date->id][$institut_id]; - } - } - - return [ - 'resourceId' => $resource_column, - 'id' => $cycle_date->id, - 'title' => $name, - 'start' => $start, - 'end' => $end, - 'textColor' => $textcolor, - 'backgroundColor' => $backgroundcolor, - 'borderColor' => '#000', - 'editable' => $is_editable, - 'startEditable' => $is_start_editable, - 'durationEditable' => $is_duration_editable, - 'resourceEditable' => true, - 'studip_api_urls' => ['move' => $move_url], - 'studip_view_urls' => ['edit' => URLHelper::getURL('dispatch.php/course/details/index/' . $cycle_date->seminar_id)], - 'metadate_id' => $cycle_date->metadate_id, - 'course_id' => $cycle_date->seminar_id, - 'tooltip' => self::getCycleInfos($course, $cycle_date), - 'icon' => $is_start_editable ? '' : 'lock-locked' - ]; - } - - /** - * Creates a string with course infos to be displayed as a tooltip in calendar events - * - * @param SeminarCycleDate $cycle_date - * - * @return string enriched course info string for tooltip - */ - private static function getCycleInfos($course, $cycle_date) - { - $info_string = ''; - - $info_string .= $course->getFullName('number-name') . "\n"; - - $dozenten = []; - foreach (CourseMember::findByCourseAndStatus($course->id, 'dozent') as $cmember) { - $dozenten[$cmember->user->user_id] = $cmember->user->getFullName(); - } - if ($dozenten) { - $info_string .= implode(', ', $dozenten) . "\n"; - } - - $rooms = []; - foreach ($cycle_date->getAllDates() as $course_date) { - $room = $course_date->getRoom(); - if ($room) { - $rooms[$room->id] = $room->name; - } - } - if ($rooms) { - $info_string .= implode(', ', $rooms) . "\n"; - } - - if ($course->getSemClass()->offsetGet('module')) { - $mvv_pathes = []; - $course_start = $course->start_time; - $course_end = ($course->end_time < 0 || is_null($course->end_time)) - ? PHP_INT_MAX - : $course->end_time; - // set filter to show only pathes with valid semester data - ModuleManagementModelTreeItem::setObjectFilter('Modul', - function ($modul) use ($course_start, $course_end) { - // check for public status - if (!$GLOBALS['MVV_MODUL']['STATUS']['values'][$modul->stat]['public']) { - return false; - } - $modul_start = Semester::find($modul->start)->beginn ?: 0; - $modul_end = Semester::find($modul->end)->ende ?: PHP_INT_MAX; - return ($modul_start <= $course_end && $modul_end >= $course_start); - } - ); - - ModuleManagementModelTreeItem::setObjectFilter('StgteilVersion', - function ($version) { - return (bool) $GLOBALS['MVV_STGTEILVERSION']['STATUS']['values'][$version->stat]['public']; - } - ); - - $trail_classes = ['Modulteil', 'StgteilabschnittModul', 'StgteilAbschnitt', 'StgteilVersion']; - $mvv_object_pathes = MvvCourse::get($course->getId())->getTrails($trail_classes); - if ($mvv_object_pathes) { - if (Config::get()->COURSE_SEM_TREE_DISPLAY) { - $mvv_tree = []; - foreach ($mvv_object_pathes as $mvv_object_path) { - // show only complete pathes - if (count($mvv_object_path) == 4) { - // flatten the pathes to a linked list - $stg = reset($mvv_object_path); - $parent_id = 'root'; - foreach ($mvv_object_path as $mvv_object) { - $mvv_object_id = $mvv_object instanceof StgteilabschnittModul - ? $mvv_object->modul_id - : $mvv_object->id; - $mvv_tree[$parent_id][$mvv_object_id] = [ - 'id' => $mvv_object_id, - 'name' => $mvv_object->getDisplayName(), - 'class' => get_class($mvv_object), - ]; - $parent_id = $mvv_object_id; - } - } - } - if (count($mvv_tree)) { - // add the root node - $mvv_tree['start'][] = [ - 'id' => 'root', - 'name' => Config::get()->UNI_NAME_CLEAN, - 'class' => '' - ]; - } - } else { - foreach ($mvv_object_pathes as $mvv_object_path) { - // show only complete pathes - if (count($mvv_object_path) == 4) { - $mvv_object_names = []; - $modul_id = ''; - foreach ($mvv_object_path as $mvv_object) { - if ($mvv_object instanceof StgteilabschnittModul) { - $modul_id = $mvv_object->modul_id; - } - $mvv_object_names[] = $mvv_object->getDisplayName(); - } - $mvv_pathes[] = [$modul_id => $mvv_object_names]; - } - } - } - // to prevent collisions of object ids in the tree - // in the case of same objects listed in more than one part - // of the tree - $id_sfx = new stdClass(); - $id_sfx->c = 1; - } - foreach ($mvv_pathes as $mvv_path) { - foreach ($mvv_path as $mvv_path_content) { - $info_string .= implode(' > ', $mvv_path_content) . "\n"; - } - } - } - - return $info_string; - } - - public static function getBackgroundEvents($start = null) - { - $datetime = new DateTime(); - $slot_duration = 1; - $start_time = 8; - $end_time = 16; - $events = []; - $day_interval = 1; - - if ($start == null) { - $datetime->modify('monday this week'); - $datetime->add(new DateInterval('PT' . $start_time . 'H')); - $day_interval = 7; - } - - for ($i = 1; $i <= $day_interval; $i++) { - for ($slot = $start_time; $slot < $end_time; $slot += $slot_duration) { - if ($slot % 2) { - $datetime->setTime($slot, 0); - $events[] = [ - 'start' => self::iso8601date($datetime, $slot), - 'end' => self::iso8601date($datetime, $slot + $slot_duration), - 'rendering' => 'background', - ]; - - } - } - $datetime->setTime($start_time, 0); - $datetime->add(new DateInterval('P1D')); - }; - return $events; - } - - private static function iso8601date($date, $time = '00:00:00', $timezone = '+00:00') - { - // If only date parameter is passed and is a DateTimeInterface object or - // unix timestamp, assume time from date - if (func_num_args() === 1 && ($date instanceof DateTimeInterface || ctype_digit($date))) { - $time = $date; - } - - // Get time - if ($time instanceof DateTimeInterface) { - $time = $time->format('H:i:s'); - } elseif (ctype_digit($time)) { - $time = date('H:i:s', $time); - } elseif (sscanf($time, '%u:%u:%u', $hours, $minutes, $seconds)) { - $time = sprintf('%02u:%02u:%02u', $hours, $minutes, $seconds); - } - - // Get date - if ($date instanceof DateTimeInterface) { - $date = $date->format('Y-m-d'); - } elseif (ctype_digit($date)) { - $date = date('Y-m-d', $date); - } - - return "{$date}T{$time}{$timezone}"; - } - - - // calculates the luminosity of an given RGB color - // the color code must be in the format of RRGGBB - // the luminosity equations are from the WCAG 2 requirements - // http://www.w3.org/TR/WCAG20/#relativeluminancedef - private static function calculateLuminosity($color) - { - $r = hexdec(substr($color, 0, 2)) / 255; // red value - $g = hexdec(substr($color, 2, 2)) / 255; // green value - $b = hexdec(substr($color, 4, 2)) / 255; // blue value - if ($r <= 0.03928) { - $r = $r / 12.92; - } else { - $r = pow(($r + 0.055) / 1.055, 2.4); - } - if ($g <= 0.03928) { - $g = $g / 12.92; - } else { - $g = pow(($g + 0.055) / 1.055, 2.4); - } - if ($b <= 0.03928) { - $b = $b / 12.92; - } else { - $b = pow(($b + 0.055) / 1.055, 2.4); - } - $luminosity = 0.2126 * $r + 0.7152 * $g + 0.0722 * $b; - return $luminosity; - } - - // calculates the luminosity ratio of two colors - // the luminosity ratio equations are from the WCAG 2 requirements - // http://www.w3.org/TR/WCAG20/#contrast-ratiodef - private static function calculateLuminosityRatio($color1, $color2) - { - $c1 = ltrim($color1, '#'); - $c2 = ltrim($color2, '#'); - $l1 = self::calculateLuminosity($c1); - $l2 = self::calculateLuminosity($c2); - if ($l1 > $l2) { - $ratio = ($l1 + 0.05) / ($l2 + 0.05); - } else { - $ratio = ($l2 + 0.05) / ($l1 + 0.05); - } - return $ratio; - } -} |