305 lines
7.1 KiB
PHP
305 lines
7.1 KiB
PHP
<?php
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namespace service;
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class CalendarExtractor{
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/* [1] Attributes
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=========================================================*/
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private $start_d = null; // 1st day date
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private $img_url = null; // image url
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private $img_res = null; // image resource
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private $event = []; // events
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private $event_t = [ 0 ]; // types of events
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/* [2] Constants
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=========================================================*/
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public static $start_y = 79; // start y
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public static $stop_y = 699; // stop y
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public static $start_h = 8; // start hour
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public static $stop_h = 20; // stop hour
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/* (1) Builds a calendar extractor
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*
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* @img_url<String> URL of the string to extract from
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* @start_d<String> Date of the first day
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*
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* @return instance<CalendarExtractor> Instance
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*
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---------------------------------------------------------*/
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public function __construct($img_url=null, $start_d=null){
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/* [1] Check arguments
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=========================================================*/ {
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/* (1) Check type */
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if( !is_string($img_url) || !is_string($start_d) )
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throw new \Exception("CalendarExtractor.__construct(<String>, <String>) expected but CalendarExtractor.__construct(<".gettype($img_url).">, <".gettype($start_d).">) received");
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/* (2) Check @img_url link availability */
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if( !($img_head=@get_headers($img_url)) )
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throw new \Exception("CalendarExtractor.__construct(<URL>, <String>) received but cannot reach <URL>");
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if( !preg_match('@HTTP.+200@', $img_head[0]) )
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throw new \Exception("CalendarExtractor.__construct(<URL>, <String>) received but cannot reach <URL>");
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/* (3) Check @start_d format */
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if( !preg_match("@^\d{1,2}-\d{1,2}-\d{3,}$@", $start_d) )
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throw new \Exception("CalendarExtractor.__construct(<String>, <DATE>) received <DATE> has not the correct format");
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}
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/* [2] Fetch file
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=========================================================*/ {
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/* (1) Try to open file with GD */
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$this->img_res = @imagecreatefrompng($img_url);
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/* (2) Manage error */
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if( !$this->img_res )
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throw new \Exception("URL is not a JPEG image, or is unreachable");
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/* (3) Register data */
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$this->img_url = $img_url;
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$this->start_d = $start_d;
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}
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}
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/* (2) Extracts calendar data from image
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*
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* @return error<bool> FALSE on error
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*
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---------------------------------------------------------*/
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public function process(){
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/* [1] Global variables
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=========================================================*/ {
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/* (1) Image size */ {
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// {1} Request for size //
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$img_siz = @getimagesize($this->img_url);
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// {2} If error //
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if( !$img_siz )
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throw new \Exception("Cannot get image size");
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$img_siz = [
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'w' => $img_siz[0],
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'h' => $img_siz[1]
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];
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}
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}
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/* [2] Extract day limits
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=========================================================*/ {
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/* (1) Will contain the column+1 w index */
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$col_ind = [];
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/* (2) Extract column indexes */
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for( $x = 0 ; $x < $img_siz['w'] ; $x++ ){
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if( $this->getColor($x, 62) <= 10 )
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$col_ind[] = $x+1;
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}
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/* (3) Remove last */
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unset( $col_ind[count($col_ind)-1] );
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}
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/* [3] For each day -> get events
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=========================================================*/ {
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/* (1) For each day */
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foreach($col_ind as $day_n=>$col_x){
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/* (2) For each y pixel -> exctract event */
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for( $y = self::$start_y ; $y < self::$stop_y ; $y++ ){
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/* (3) Get current color + next */
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$p = $this->getColor($col_x, $y);
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$p1 = $this->getColor($col_x, $y+1);
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/* (4) If on black pixel and next not white */
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if( $p == 0 && $p1 != 0xffffff ){
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// {1} calculate time //
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$time = $this->yToTime($day_n, $y);
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// {2} Store new event type (if missing) //
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if( !isset($this->event_t[$p1]) )
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$this->event_t[$p1] = $this->event_t[0]++;
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$uid = $this->event_t[$p1];
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// {3} Store event start //
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$this->event[$uid][$time] = [];
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// {4} Seek end of event //
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$y++;
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while( $y < self::$stop_y && $this->getColor($col_x, $y) != 0 )
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$y++;
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// {5} If end reached //
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$this->event[$uid][$time] = $this->yToTime($day_n, $y);
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}
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}
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}
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}
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}
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/* (3) Get a pixel's color
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*
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* @x<int> X coordinate
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* @y<int> Y coordinate
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*
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* @return color<u_int32> Raw color
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*
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---------------------------------------------------------*/
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private function getColor($x, $y){
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return imagecolorat($this->img_res, $x, $y);
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}
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/* (4) Get time from a y-coordinate
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*
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* @day_n<int> Day relative index
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* @y<int> y Coordinate
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*
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* @return time<String> Formatted time (HH:mm)
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*
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---------------------------------------------------------*/
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private function yToTime($day_n, $y){
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/* [1] Get the date
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=========================================================*/ {
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/* (1) Get the day's date */
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$day_ts = strtotime($this->start_d." + $day_n days");
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/* (2) Format it */
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$day = date('Ymd', $day_ts);
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}
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/* [2] Get the time
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=========================================================*/{
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/* (1) Get the time */
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$time = self::$start_h + (self::$stop_h-self::$start_h) * ($y-self::$start_y) / (self::$stop_y-self::$start_y);
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/* (2) Calculate hour form time */
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$hour = floor($time);
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/* (3) Calculate min from time */
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$min = round( 60 * ($time-$hour) );
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/* (4) Round minutes to 10min */
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$min = round($min/10)*10;
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/* (5) Format to 2-digit */
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$hour = ( $hour < 10 ) ? "0$hour" : $hour;
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$min = ( $min < 10 ) ? "0$min" : $min ;
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}
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/* [3] Convert to GMT (UTC+0)
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=========================================================*/
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/* (1) Set fixed timezone offset */
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$tz_offset = +2;
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/* (2) Get GMT (UTC+0) timestamp */
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$ts = strtotime("${day} $hour:$min:00") - (3600*$tz_offset);
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/* (3) Return GMT date */
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return date("Ymd\THis\Z", $ts);
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}
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/* (5) Generate ICS output
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*
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* @return ics<String> ICS Representation of the events
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*
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---------------------------------------------------------*/
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public function toIcs(){
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$RAW = "";
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/* [1] Manage types
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=========================================================*/
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$type_name = [];
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foreach($this->event_t as $color=>$uid)
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$type_name[$uid] = $color;
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/* [2] For each event
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=========================================================*/
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foreach($this->event as $event_t=>$events){
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$type = "Event of type '".$type_name[$event_t]."'";
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/* (2) For each event of each type
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---------------------------------------------------------*/
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foreach($events as $start_t=>$stop_t){
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$RAW .= "BEGIN:VEVENT\n";
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$RAW .= "DTSTAMP:".gmdate("Ymd\THis\Z", time())."\n"; // required
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$RAW .= "DTSTART:${start_t}\n";
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$RAW .= "DTEND:${stop_t}\n";
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$RAW .= "UID:$start_t-univ-pau-ics\n"; // required
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$RAW .= "SUMMARY:$type\n";
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$RAW .= "CATEGORIES: UPPA Calendar\n";
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$RAW .= "END:VEVENT\n";
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}
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}
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return $RAW;
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}
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} |