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ID: 512

Viewed: 4301

Added: Sep 30, 2003

Version: 1

Snippet uploaded by: snippet

Written By: snippet

Demo: Sorry, no demo

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here is a short little script that will take an image and create a thumbnail view of the same image. this will not just resize it but it creates a new image and makes it the correct size so it actually leaves the default image alone.

Browsers: all
GD Library: 2.0+

none

 <?php 

    $error = False;
    $img_size = 20;
    $image = "someimage.jpg";

    // check if the 'image' parameter has been given 
    if (!isset($image)){ // if not generate an error
        $error = True;
    }
    if(!$bigimage=@imagecreatefromjpeg($image)){
    $error = true;         
    }
     
    if($error){ // generate an error image 
        $img = ImageCreate(123, 100);
        $bg = ImageColorAllocate($img, 255, 255, 255); 
        $white = ImageColorAllocate($img, 255, 0, 0); 
        ImageString($img, 5, 30, 20, "Picture", $white); 
        ImageString($img, 5, 45, 40, "Not", $white); 
        ImageString($img, 5, 25, 60, "Available", $white); 
        ImagePNG($img); 
        ImageDestroy($img); 
        exit(); 
    } 
     
    $x=imageSX($bigimage); 
    $y=imageSY($bigimage);         
     
    if($resize == 'no' || (($x > $y) && ($x < $img_size)) || (($y > $x) && ($y < $img_size))){ 

        imagejpeg($bigimage); 
        exit(); 
    } 
     
    // find the larger dimension 
    if ($x>$y) {    // if it is the width then 
        $dx = 0;                    // the left side of the new image 
        $w = $img_size;                // the width of the new image 
        $h = ($y / $x) * $img_size;    // the height of the new image 
        $dy = 0;                    // the top of the new image 
    } else {    // if the height is larger then 
        $dy = 0;                    // the top of the new image 
        $h = $img_size;                // the height of the new image 
        $w = ($x / $y) * $img_size;    // the width of the new image 
        $dx = 0;    // the left edgeof the new image 
    }

    $thumbimage =ImageCreateTrueColor($w, $h);
    ImageCopyResampled($thumbimage, $bigimage, $dx, $dy, 0, 0, $w, $h, $x, $y);

    imagejpeg($tnimage);     

    // release the memory used by the thumbnail image 
    ImageDestroy($thumbimage);
     
    // release the memory used by the original big image 
    ImageDestroy($bigimage);

?>

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