draw line with php using coordinates from txt file - php

Question

I have file A2.txt with coordinate x1,y1,x2,y2 in every line like below :
204 13 225 59
225 59 226 84
226 84 219 111
219 111 244 192
244 192 236 209
236 209 254 223
254 223 276 258
276 258 237 337
in my php file i have that code. This code should take every line and draw line with coordinate from line. But something was wrong cause nothing was draw :/:
<?php
$plik = fopen("A2.txt", 'r') or die("blad otarcia");
while(!feof($plik))
{
$l = fgets($plik,20);
$k = explode(' ',$l);
imageline ( $mapa , $k[0] , $k[1] , $k[2] , $k[3] , $kolor );
}
imagejpeg($mapa);
imagedestroy($mapa);
fclose($plik) ;
?>
If I use imagejpeg and imagedestroy in while its only first line draw. What to do to draw every line ??
Please help :)

Answer 1

Unstructured, no cleanup or error checking example:
<?php
$plik = <<<EOD
204 13 225 59
225 59 226 84
226 84 219 111
219 111 244 192
244 192 236 209
236 209 254 223
254 223 276 258
276 258 237 337
EOD;
$plik = preg_replace('/\r\n?/', "\n", $plik);
$arr = explode("\n", $plik);
array_walk($arr,
function (&$value, $key) {
$value = explode(' ', $value);
}
);
$minwidth = array_reduce($arr,
function ($res, $val) { return min($res, $val[0], $val[2]); },
PHP_INT_MAX);
$maxwidth = array_reduce($arr,
function ($res, $val) { return max($res, $val[0], $val[2]); },
(PHP_INT_MAX * -1) - 1);
$minheight = array_reduce($arr,
function ($res, $val) { return min($res, $val[1], $val[3]); },
PHP_INT_MAX);
$maxheight = array_reduce($arr,
function ($res, $val) { return max($res, $val[1], $val[3]); },
(PHP_INT_MAX * -1) - 1);
/* note: The image does not reflect the "+ 1"'s I added in a subsequent edit */
$mapa = imagecreatetruecolor($maxwidth - $minwidth + 1, $maxheight - $minheight + 1);
$kolor = imagecolorallocate($mapa, 100, 200, 50);
foreach ($arr as $k) {
imageline($mapa,
$k[0] - $minwidth,
$k[1] - $minheight,
$k[2] - $minwidth,
$k[3] - $minheight, $kolor );
}
header("Content-type: image/png");
imagepng($mapa);
result: