$angle){
//그래프용
$im = imagecreatetruecolor($graph_size * 2, $graph_size * 2);
$red = imagecolorallocate($im, 0xFF, 0x00, 0x00);
$blue = imagecolorallocate($im, 0x00, 0x80, 0xFF);
$white = imagecolorallocate($im, 0xFF, 0xFF, 0xFF);
$black = imagecolorallocate($im, 0x00, 0x00, 0x00);
imagefilledrectangle($im, 0, 0, ($graph_size * 2) - 1, ($graph_size * 2) - 1, $white);
imageline ( $im , $graph_size , 0 , $graph_size, ($graph_size * 2) - 1 , $blue);//세로선
imageline ( $im , 0 , $graph_size , ($graph_size * 2) - 1, $graph_size , $blue);//가로선
imagefttext($im, $graph_font_size, 0, 185, 220, $black, $font_file, '0');
imagefttext($im, $graph_font_size, 0, 135, 20, $black, $font_file, 'Y축 음수');
imagefttext($im, $graph_font_size, 0, 135, 390, $black, $font_file, 'Y축 양수');
imagefttext($im, $graph_font_size, 0, 10, 220, $black, $font_file, 'X축 음수');
imagefttext($im, $graph_font_size, 0, 340, 220, $black, $font_file, 'X축 양수');
echo "기울기가 {$angle}도 일때
" . PHP_EOL;
$array = imageftbbox ( $font_size, $angle, $font_file, $string );
print_r($array);
echo "
" . PHP_EOL;
// $graph_size 을 더한것은 그래프상에서 보여주기 위해서
imageline ( $im , $array[0] + $graph_size , $array[1] + $graph_size , $array[2] + $graph_size, $array[3] + $graph_size , $blue);
imageline ( $im , $array[2] + $graph_size , $array[3] + $graph_size , $array[4] + $graph_size, $array[5] + $graph_size , $blue);
imageline ( $im , $array[4] + $graph_size , $array[5] + $graph_size , $array[6] + $graph_size, $array[7] + $graph_size , $blue);
imageline ( $im , $array[6] + $graph_size , $array[7] + $graph_size , $array[0] + $graph_size, $array[1] + $graph_size , $blue);
$x_min = min($array[0], $array[2], $array[4], $array[6]) * -1;
$y_min = min($array[1], $array[3], $array[5], $array[7]) * -1;
//전부 양수가 되도록 오른쪽, 하단으로 밀어내림
imageline ( $im , $array[0] + $x_min + $graph_size , $array[1] + $y_min + $graph_size , $array[2] + $x_min + $graph_size, $array[3] + $y_min + $graph_size , $black);
imageline ( $im , $array[2] + $x_min + $graph_size , $array[3] + $y_min + $graph_size , $array[4] + $x_min + $graph_size, $array[5] + $y_min + $graph_size , $black);
imageline ( $im , $array[4] + $x_min + $graph_size , $array[5] + $y_min + $graph_size , $array[6] + $x_min + $graph_size, $array[7] + $y_min + $graph_size , $black);
imageline ( $im , $array[6] + $x_min + $graph_size , $array[7] + $y_min + $graph_size , $array[0] + $x_min + $graph_size, $array[1] + $y_min + $graph_size , $black);
imagefttext($im, $font_size, $angle, $array[0] + $x_min + $graph_size, $array[1] + $y_min + $graph_size, $red, $font_file, $string);
imagepng($im, 'temp/study3_' . ($k + 1) . '.png');
imagedestroy($im);
?>
?>.png?<?=time()?>)