<?php

/**
 * @author Tadeusz Jedynak
 * @copyright 2024-2025
 * https://alfard.ovh/index.php/phpwykres/
 */

header('Content-Type: image/png');

if (isset($_GET['jedn'])) $jedn=$_GET['jedn']; else $jedn='';
                                                                    //grad.jpg
function gen_wykres($dane, $width = 400, $height = 150, $dist = 5, $tlo = 'alfa2.jpg', $font = 'calibril.ttf')
{
     global $jedn;
 $wykres = imagecreatetruecolor($width, $height);
 $bcg_image = imagecreatefromjpeg($tlo);
 $background = imagecolorat($bcg_image, 0, imagesy($bcg_image) - 1);

 imagefill($wykres, 0, 0, $background);
 imagecopyresampled($wykres, $bcg_image, 0, 0, 0, 0, $width, imagesy($bcg_image), imagesx($bcg_image), imagesy($bcg_image));

 $count_all = array_sum($dane);
 $maX = max($dane);
 $miN = min($dane);
 $el_width = round(($width - $dist) / count($dane));
 $mky = ($height - ($dist * 2)) / ($miN-$maX);
 $ConstY=$height-$dist-round($mky*$miN);
 $top = round(0*$mky)+$ConstY;
 if ($top>($height-$dist)) $top=($height-$dist);
 $i=0;
 foreach ($dane as $key => $value)
 {
  $va=round($value*$mky)+$ConstY;
  $col = 255-round($va/0.6); //round(255 - (150 / count($dane)) * $i);
  $colors[$key] = imagecolorallocate($wykres, $col, 200, 0);
  $text_color[$key] = imagecolorallocate($wykres, 0,0,0);
  $left = $i * $el_width + $dist;
  $srodek=$left + round($el_width/2)+5;
 imagefilledrectangle($wykres, $left, $va, $left + $el_width - $dist, $top, $colors[$key]);
 imagettftext($wykres, 16, 90, $srodek, $height - $dist - 20, $text_color[$key],
              $font, $key.': '.round($value,1).''); 
  $i++;
 }
 imagettftext($wykres, 8, 0, 2,10, $text_color[$key], $font,'©2025Tad1ak');

 return $wykres;
}

$filename = "DaneDawkiUV.txt";

$output = Array();

foreach(file($filename) as $w){
  $w = explode('|', $w); // lub rtrim($w) w zależności czy dopuszczasz \n na końcu
  $output[ $w[0] ] = $w[1];
}

$wykres = gen_wykres($output);
imagepng($wykres);

?>