Zoom Crop Image
This snippet is great for creating thumbnails of varying dimensions. For example if you wanted to create a rectangular thumb automatically. Basically you load an image (ie. $im = imageloadfromjpeg) into a variable and then you can pass that variable to this snippet and have it return a new image variable.
Snippet:
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<?
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// gives a nice rectangular crop of an image
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// this function depends on the constrained MINIMUM function…
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// zoom crops are useful for making rectangular thumbs instantly
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// of images…
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// http://thedevnet.com/php/snippets/zoom-crop-image/
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function zoom_crop($img, $w, $h)
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{
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// min resize the bastard…
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$img = c_minresize($img, $w, $h);
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$orig_w = imagesx($img);
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$orig_h = imagesy($img);
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// set where the crop should begin width and height wise..
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// /2 will be center… however.. most portrait images have the
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// content action near the top.. so that's why I use /5 for
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// vertically cropped images… adjust to fit your need..
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$start_y = floor(($orig_h - $h) /5);
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$start_x = floor(($orig_w - $w) /2);
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// now lets create a new image…
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$new_im = imagecreatetruecolor($w, $h);
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imagecopy($new_im, $img, 0,0, $start_x, $start_y, $w,$h);
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return $new_im; // return the new image…
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}
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?>
Snippet 2: (required from Constrained Image Resize Min/Max )
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<?
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// constrained resize.. (max value)
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// constraining to a MAXIMUM value means that we want the image
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// to be NO MORE then $w or $h…
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// so when it resizes an image… it'll constrain it to the same dimensions
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// but it will not exceed in width or height the values of $max_width or $max_height
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// http://thedevnet.com/php/snippets/zoom-crop-image/
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function c_resize( $img, $max_width, $max_height)
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{
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$FullImage_width = imagesx ($img); // Original image width
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$FullImage_height = imagesy ($img); // Original image height
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// now we check for over-sized images and pare them down
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// to the dimensions we need for display purposes
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$ratio = ( $FullImage_width > $max_width ) ? (real)($max_width / $FullImage_width) : 1 ;
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$new_width = ((int)($FullImage_width * $ratio));
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$new_height = ((int)($FullImage_height * $ratio));
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//check for images that are still too high
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$ratio = ( $new_height > $max_height ) ? (real)($max_height / $new_height) : 1 ;
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$new_width = ((int)($new_width * $ratio)); //mid-size width
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$new_height = ((int)($new_height * $ratio)); //mid-size height
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$NEW_IM = imagecreatetruecolor( $new_width , $new_height );
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imagecopyresampled( $NEW_IM, $img,
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0,0, 0,0, //starting points
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$new_width, $new_height,
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$FullImage_width, $FullImage_height );
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return $NEW_IM;
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}
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// constrained resize.. (min value)
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// constraining to a minimum value means that we want the image
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// to be NO LESS then $w or $h…
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// so when it resizes an image… it'll constrain it to the same dimensions
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// but it will not be reduced less then a certain width or certain height…
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// this is useful for a crop function
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// http://thedevnet.com/php/snippets/zoom-crop-image/
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function c_minresize($img, $w, $h)
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{
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$src_w = imagesx($img);
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$src_h = imagesy($img);
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$pct_w = ($w / $src_w) * 100;
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$pct_h = ($h / $src_h) * 100;
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if($pct_w > $pct_h)
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{
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$new_w = $src_w * ($pct_w / 100);
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$new_h = $src_h * ($pct_w / 100);
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}
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else
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{
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$new_w = $src_w * ($pct_h / 100);
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$new_h = $src_h * ($pct_h / 100);
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}
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$new_w *= 1.05;
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$new_h *= 1.05;
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return c_resize( $img, $new_w, $new_h);
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}
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?>
Example:
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<?
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// load the image
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$im = imagecreatefromjpeg("test.jpg");
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// crop the image (make it 200 pixels wide and 100 pixels high)
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$im = zoom_crop($img, 200, 100);
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// display the image
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imagejpeg($im);
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?>
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Originally posted 2009-10-16 23:05:06.
Popularity: 40%
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