<?php
Class ResizedImage
{
public $imgfile;
public $string = '';
public $new_width = 0;
public $new_height = 0;
public $angle = 0;
public $max_font_size = 1000;
public $cropped = false;//whether crop the original image if h or w > new h or w
public $font = 'fonts/arialbd.ttf';
private $img;
private $trans_colour;
private $orange;
private $white;
private $whitetr;
private $blacktr;
public function PrintAsBase64()
{
$this->SetImage();
ob_start();
imagepng($this->img);
$b64img = ob_get_contents();
ob_clean();
imagedestroy($this->img);
$b64img = base64_encode($b64img);
echo($b64img);
}
public function PrintAsImage()
{
$this->SetImage();
header('Content-type: image/png');
imagepng($this->img);
imagedestroy($this->img);
}
private function SetImage()
{
if ($this->imgfile == '') {$this->imgfile='NoImageAvailable.jpg';}
$this->img = imagecreatefromstring(file_get_contents($this->imgfile));
$this->trans_colour = imagecolorallocatealpha($this->img, 0, 0, 0, 127);
$this->orange = imagecolorallocate($this->img, 220, 210, 60);
$this->white = imagecolorallocate($this->img, 255,255, 255);
$this->whitetr = imagecolorallocatealpha($this->img, 255,255, 255, 95);
$this->blacktr = imagecolorallocatealpha($this->img, 0, 0, 0, 95);
if ((!$this->cropped) && ($this->string !=''))
{$this->watermarkimage();}
if (($this->new_height > 0) && ($this->new_width > 0)) {$this->ResizeImage();};
if (($this->cropped) && ($this->string !=''))
{$this->watermarkimage();}
imageAlphaBlending($this->img, true);
imageSaveAlpha($this->img, true);
}
////
private function ResizeImage()
{
# v_fact and h_fact are the factor by which the original vertical/horizontal
# image sizes should be multiplied to get the image to your target size.
$v_fact = $this->new_height/imagesy($this->img);//target_height/im_height;
$h_fact = $this->new_width/imagesx($this->img);//target_width/im_width;
# you want to resize the image by the same factor in both vertical
# and horizontal direction, so you need to pick the correct factor from
# v_fact/h_fact so that the largest (relative to target) of the new height/width
# equals the target height/width and the smallest is lower than the target.
# this is the lowest of the two factors
if($this->cropped)
{ $im_fact = max($v_fact, $h_fact); }
else
{ $im_fact = min($v_fact, $h_fact); }
$new_height = round(imagesy($this->img) * $im_fact);
$new_width = round(imagesx($this->img) * $im_fact);
$img2 = $this->img;
$this->img = imagecreatetruecolor($new_width, $new_height);
imagecopyresampled($this->img, $img2, 0, 0, 0, 0, $new_width, $new_height, imagesx($img2), imagesy($img2));
$img2 = $this->img;
$this->img = imagecreatetruecolor($this->new_width, $this->new_height);
imagefill($this->img, 0, 0, $this->trans_colour);
$dstx = 0;
$dsty = 0;
if ($this->cropped)
{
if (imagesx($this->img) < imagesx($img2))
{ $dstx = round((imagesx($this->img)-imagesx($img2))/2); }
if (imagesy($this->img) < imagesy($img2))
{ $dsty = round((imagesy($this->img)-imagesy($img2))/2); }
}
else
{
if (imagesx($this->img) > imagesx($img2))
{ $dstx = round((imagesx($this->img)-imagesx($img2))/2); }
if (imagesy($this->img) > imagesy($img2))
{ $dsty = round((imagesy($this->img)-imagesy($img2))/2); }
}
imagecopy ($this->img, $img2, $dstx, $dsty, 0, 0, imagesx($img2) , imagesy($img2));
imagedestroy($img2);
}
////
private function calculateTextBox($text,$fontFile,$fontSize,$fontAngle)
{
/************
simple function that calculates the *exact* bounding box (single pixel precision).
The function returns an associative array with these keys:
left, top: coordinates you will pass to imagettftext
width, height: dimension of the image you have to create
*************/
$rect = imagettfbbox($fontSize,$fontAngle,$fontFile,$text);
$minX = min(array($rect[0],$rect[2],$rect[4],$rect[6]));
$maxX = max(array($rect[0],$rect[2],$rect[4],$rect[6]));
$minY = min(array($rect[1],$rect[3],$rect[5],$rect[7]));
$maxY = max(array($rect[1],$rect[3],$rect[5],$rect[7]));
return array(
"left" => abs($minX) - 1,
"top" => abs($minY) - 1,
"width" => $maxX - $minX,
"height" => $maxY - $minY,
"box" => $rect);
}
private function watermarkimage($font_size=0)
{
if ($this->string == '')
{die('Watermark function call width empty string!');}
$box = $this->calculateTextBox($this->string, $this->font, $font_size, $this->angle);
while (($box['width'] < imagesx($this->img)) && ($box['height'] < imagesy($this->img)) && ($font_size <= $this->max_font_size))
{
$font_size++;
$box = $this->calculateTextBox($this->string, $this->font, $font_size, $this->angle);
}
$font_size--;
$box = $this->calculateTextBox($this->string, $this->font, $font_size, $this->angle);
$vcenter = round((imagesy($this->img)/2) + ($box['height']/2));
$hcenter = round((imagesx($this->img) - $box['width'])/2);
imagettftext($this->img, $font_size, $this->angle, $hcenter, $vcenter, $this->blacktr, $this->font, $this->string);
imagettftext($this->img, $font_size, $this->angle, $hcenter+1, $vcenter-2, $this->whitetr, $this->font, $this->string);
}
}
?>
Inoltre, ho utilizzato la risposta accettata ma in alcuni casi non mantiene il rapporto. Ho trovato alcune buone risposte sul forum e le ho messe insieme e finalmente ho creato una classe che ridimensiona un'immagine. Come funzione extra puoi mettere un testo filigrana.
Si può vedere cosa succede quando si sceglie di ritagliare o meno, se non viene aggiunta un'area trasparente alla nuova immagine ridimensionata.
Questo esempio è più che richiesto, ma penso che sia un buon esempio.
Nice - Grazie mille, sarà utile. Sto parlando con l'host per cercare di ottenere Imagick in ordine ... ottenendo un errore fatale al momento dove dice che non è stata trovata la classe ... –
Se usi ' 'e fare una ricerca per GD, se è abilitato, la funzione sopra dovrebbe funzionare, anche senza imagick :), tuttavia, se si verificano errori, sentitevi liberi di farmelo sapere. –
Non ha funzionato per me. Non ha mantenuto le proporzioni. –