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<?php
/**
* album_thumbnail class
*
* Generates a collage thumbnail from four images. The layout used will be based on the
* aspect ratios of the images provided. You should change the default values of the
* parameters for the constructor if the same values will be used all the time.
*
* Example usage:
* $at = new album_thumbnail();
* $at->add_image('/images/001.jpg');
* $at->add_image('/images/002.jpg');
* $at->add_image('/images/003.jpg');
* $at->add_image('/images/004.jpg');
*
* $at->make_thumbnail('/images/thumb1234.jpg');
*
* ============================================================================
*
* LAYOUTS - where image 0 is the narrowest (lowest width:height ratio), image 3 is the widest.
*
* LAYOUT 4A - for mostly normal proportions
* +---+-------+
* | 1 | 2 |
* +---+-----+-+
* | 3 |0|
* +---------+-+
*
* LAYOUT 4B - for two tall and two normal photos.
* +---+-----+---+
* | | 3 | |
* | 1 +-----+ 0 |
* | | 2 | |
* +---+-----+---+
*
* LAYOUT 4C - for one image taller than the rest
* +---+-----------+
* | 1 | |
* +---+ |
* | 3 | 0 |
* +---+ |
* | 2 | |
* +---+-----------+
*
* LAYOUT 4D - for all wide photos
* +--------------+
* | 1 |
* +--------------|
* | 3 |
* +--------------|
* | 2 |
* +--------------+
* | 0 |
* +--------------+
*
* LAYOUT 3A - for three tall photos
* +---+-----+-+
* | | | |
* | 1 | 2 |0|
* | | | |
* +---+-----+-+
*
* @author Kip Robinson, www.vacant-nebula.com
*/
class album_thumbnail
{
var $images = array();
var $images_idx = array();
var $ratios = array();
var $width;
var $padding;
var $border_width;
var $bg_color;
var $border_color;
/**
* You probably want to change the default values of these parameters so that you don't have to
* specify them everytime.
*
* @param $width Total width of the thumbnail in pixels, including padding and border.
* @param $padding Width in pixels of gap between photos, and gap between photo and edge.
* Does not include borders.
* @param $border_width Width in pixels of border around each photo. No border is drawn around
* the whole image.
* @param $bg_color The color to use for the background (i.e. the padding).
* @param $border_color The color to use for the borders around the photos.
*/
function __construct($width = 196, $padding = 2, $border_width = 1, $bg_color = 0xffffff, $border_color = 0x808080)
{
$this->width = $width;
$this->padding = $padding;
$this->border_width = $border_width;
$this->bg_color = $bg_color;
$this->border_color = $border_color;
}
function __destruct()
{
$this->cleanup();
}
function cleanup()
{
foreach($this->images as $image)
imagedestroy($image);
$this->images = array();
}
function add_image($file)
{
$src = false;
$ext = strtolower(strrchr($file, '.'));
if ($ext == '.jpg' || $ext == '.jpeg' || $ext == '.jpe')
$src = imagecreatefromjpeg($file);
else if ($ext == '.gif')
$src = imagecreatefromgif($file);
else if ($ext == '.png')
$src = imagecreatefrompng($file);
if ($src != false)
$this->images[] = $src;
}
function make_thumbnail($dest_file)
{
if (count($this->images) < 4)
return;
$this->compute_ratios();
$layouts = array();
//Determine what layout to use
if ($this->ratios[0] > 2.0) //all pretty wide
{
$layouts = $this->layout_4d();
}
else if ($this->ratios[2] < 0.8) //all images pretty tall
{
//drop the widest image, use vertical panel layout
imagedestroy($this->images[3]);
array_pop($this->images);
$layouts = $this->layout_3a();
}
else if ($this->ratios[0] <= 1.0 && $this->ratios[1] > 1.2) //one tall image
{
$layouts = $this->layout_4c();
}
else if ($this->ratios[1] <= 1.0 && $this->ratios[2] > 1.3 && mt_rand(0,1)) //2 wide, 2 tall: 50% chance of 4b
{
$layouts = $this->layout_4b();
}
else //all other combinations
{
$layouts = $this->layout_4a();
}
$this->build_thumb($layouts, $dest_file);
$this->cleanup();
}
//Private methods
private function compute_ratios()
{
//first sort images by their aspect ratios
usort($this->images, create_function('&$a, &$b', '$r=imagesx($a)/imagesy($a)-imagesx($b)/imagesy($b);return($r<0?-1:($r>0?1:0));') );
//clear $ratios (shouldn't be needed.. just in case)
if (count($this->ratios) != 0)
$this->ratios = array();
//store ratios in $ratios array, parallel to $images array
foreach($this->images as $image)
$this->ratios[] = imagesx($image) / imagesy($image);
}
private function build_thumb($layouts, $file)
{
$height = 0;
foreach ($layouts as $layout)
{
if ($layout['h'] + $layout['y'] > $height)
$height = $layout['h'] + $layout['y'];
}
$height += $this->padding + $this->border_width;
$canvas = imagecreatetruecolor($this->width, $height);
imagefill($canvas, 0, 0, $this->bg_color);
$border = imagecreatetruecolor(4, 4);
imagefill($border, 0, 0, $this->border_color);
for ($i = 0; $i < count($layouts); $i++)
{
imagecopyresized ( $canvas, $border,
$layouts[$i]['x'] - $this->border_width, $layouts[$i]['y'] - $this->border_width, 0, 0,
$layouts[$i]['w'] + 2*$this->border_width, $layouts[$i]['h'] + 2*$this->border_width, 4, 4 );
imagecopyresampled($canvas, $this->images[$i],
$layouts[$i]['x'], $layouts[$i]['y'], 0, 0,
$layouts[$i]['w'], $layouts[$i]['h'], imagesx($this->images[$i]), imagesy($this->images[$i]) );
}
if (file_exists($file))
unlink($file);
imagejpeg($canvas, $file, 75);
imagedestroy($border);
imagedestroy($canvas);
}
//-------------------------------------------------------------
// LAYOUT FUNCTIONS
//-------------------------------------------------------------
// Layout 4a - for mostly normal proportions
// +---+-------+
// | 1 | 2 |
// +---+-----+-+
// | 3 |0|
// +---------+-+
private function layout_4a()
{
$ret = array();
//$h1 = height of row 1, $h2 = height of row 2
$h1 = ($this->width - 3*$this->padding - 4*$this->border_width) /
($this->ratios[1] + $this->ratios[2]);
$h2 = ($this->width - 3*$this->padding - 4*$this->border_width) /
($this->ratios[3] + $this->ratios[0]);
$ret[1] = array(
'w' => round( $this->ratios[1] * $h1 ),
'h' => round( $h1 ),
'x' => $this->padding + $this->border_width,
'y' => $this->padding + $this->border_width
);
$ret[2] = array(
'w' => $this->width - $ret[1]['w'] - 3*$this->padding - 4*$this->border_width,
'h' => $ret[1]['h'],
'x' => $ret[1]['x'] + $ret[1]['w'] + $this->padding + 2*$this->border_width,
'y' => $ret[1]['y']
);
$ret[3] = array(
'w' => round( $this->ratios[3] * $h2 ),
'h' => round( $h2 ),
'x' => $ret[1]['x'],
'y' => $ret[1]['y'] + $ret[1]['h'] + $this->padding + 2*$this->border_width
);
$ret[0] = array(
'w' => $this->width - $ret[3]['w'] - 3*$this->padding - 4*$this->border_width,
'h' => $ret[3]['h'],
'x' => $ret[3]['x'] + $ret[3]['w'] + $this->padding + 2*$this->border_width,
'y' => $ret[3]['y']
);
return $ret;
}
// LAYOUT 4B - for two tall and two normal photos.
// +---+-----+---+
// | | 3 | |
// | 1 +-----+ 0 |
// | | 2 | |
// +---+-----+---+
private function layout_4b()
{
$ret = array();
//$h1 = height of image 1, etc
$h1 = ($this->width - 2*$this->padding - 2*$this->border_width +
($this->padding + 2*$this->border_width)*
(1/(1/$this->ratios[3] + 1/$this->ratios[2]) - 2)) /
($this->ratios[1] + $this->ratios[0] +
1/(1/$this->ratios[3] + 1/$this->ratios[2]));
$h3 = ($h1 - $this->padding - 2*$this->border_width) /
(1 + $this->ratios[3] / $this->ratios[2]);
$h2 = $h1 - $h3 - $this->padding - 2*$this->border_width;
$ret[1] = array(
'w' => round( $this->ratios[1] * $h1 ),
'h' => round( $h1 ),
'x' => $this->padding + $this->border_width,
'y' => $this->padding + $this->border_width
);
$ret[3] = array(
'w' => round( $this->ratios[3] * $h3 ),
'h' => round( $h3 ),
'x' => $ret[1]['x'] + $ret[1]['w'] + $this->padding + 2*$this->border_width,
'y' => $ret[1]['y']
);
$ret[2] = array(
'w' => $ret[3]['w'],
'h' => $ret[1]['h'] - $ret[3]['h'] - $this->padding - 2*$this->border_width,
'x' => $ret[3]['x'],
'y' => $ret[3]['y'] + $ret[3]['h'] + $this->padding + 2*$this->border_width
);
$ret[0] = array(
'w' => $this->width - $ret[1]['w'] - $ret[3]['w'] - 4*$this->padding - 6*$this->border_width,
'h' => $ret[1]['h'],
'x' => $ret[2]['x'] + $ret[2]['w'] + $this->padding + 2*$this->border_width,
'y' => $ret[1]['y']
);
return $ret;
}
// LAYOUT 4C - for one image taller than the rest
// +---+-----------+
// | 1 | |
// +---+ |
// | 3 | 0 |
// +---+ |
// | 2 | |
// +---+-----------+
private function layout_4c()
{
$ret = array();
$h0 = ($this->width - 2*$this->padding - 2*$this->border_width -
($this->padding + 2*$this->border_width) *
(1 - (2/(1/$this->ratios[3] + 1/$this->ratios[2] + 1/$this->ratios[1])))) /
($this->ratios[0] + (1/(1/$this->ratios[3] + 1/$this->ratios[2] + 1/$this->ratios[1])));
$h1 = ($h0 - 2*$this->padding - 4*$this->border_width) /
($this->ratios[1]*(1/$this->ratios[3] + 1/$this->ratios[2]) + 1);
$h3 = $h1 * $this->ratios[1] / $this->ratios[3];
$h2 = $h0 - $h1 - $h3 - 2*$this->padding - 4*$this->border_width;
$ret[1] = array(
'w' => round( $this->ratios[1] * $h1 ),
'h' => round( $h1 ),
'x' => $this->padding + $this->border_width,
'y' => $this->padding + $this->border_width
);
$ret[3] = array(
'w' => $ret[1]['w'],
'h' => round( $h3 ),
'x' => $ret[1]['x'],
'y' => $ret[1]['y'] + $ret[1]['h'] + $this->padding + 2*$this->border_width,
);
$ret[2] = array(
'w' => $ret[1]['w'],
'h' => round( $h2 ),
'x' => $ret[1]['x'],
'y' => $ret[3]['y'] + $ret[3]['h'] + $this->padding + 2*$this->border_width,
);
$ret[0] = array(
'w' => $this->width - $ret[1]['w'] - 3*$this->padding - 4*$this->border_width,
'h' => $ret[1]['h'] + $ret[3]['h'] + $ret[2]['h'] + 2*$this->padding + 4*$this->border_width,
'x' => $ret[1]['x'] + $ret[1]['w'] + $this->padding + 2*$this->border_width,
'y' => $ret[1]['y']
);
return $ret;
}
// LAYOUT 4D - for all wide photos
// +--------------+
// | 1 |
// +--------------|
// | 3 |
// +--------------|
// | 2 |
// +--------------+
// | 0 |
// +--------------+
private function layout_4d()
{
$ret = array();
$w1 = $this->width - 2*$this->padding - 2*$this->border_width;
$ret[1] = array(
'w' => $w1,
'h' => round( $w1 / $this->ratios[1] ),
'x' => $this->padding + $this->border_width,
'y' => $this->padding + $this->border_width,
);
$ret[3] = array(
'w' => $ret[1]['w'],
'h' => round( $w1 / $this->ratios[3] ),
'x' => $ret[1]['x'],
'y' => $ret[1]['y'] + $ret[1]['h'] + $this->padding + 2*$this->border_width
);
$ret[2] = array(
'w' => $ret[1]['w'],
'h' => round( $w1 / $this->ratios[2] ),
'x' => $ret[1]['x'],
'y' => $ret[3]['y'] + $ret[3]['h'] + $this->padding + 2*$this->border_width
);
$ret[0] = array(
'w' => $ret[1]['w'],
'h' => round( $w1 / $this->ratios[0] ),
'x' => $ret[1]['x'],
'y' => $ret[2]['y'] + $ret[2]['h'] + $this->padding + 2*$this->border_width
);
return $ret;
}
// LAYOUT 3A - for three tall photos
// +---+-----+-+
// | | | |
// | 1 | 2 |0|
// | | | |
// +---+-----+-+
private function layout_3a()
{
$ret = array();
$h1 = ($this->width - 4*$this->padding - 6*$this->border_width) /
($this->ratios[0] + $this->ratios[1] + $this->ratios[2]);
$ret[1] = array(
'w' => round( $this->ratios[1] * $h1 ),
'h' => round( $h1 ),
'x' => $this->padding + $this->border_width,
'y' => $this->padding + $this->border_width
);
$ret[2] = array(
'w' => round( $this->ratios[2] * $h1 ),
'h' => $ret[1]['h'],
'x' => $ret[1]['x'] + $ret[1]['w'] + $this->padding + 2*$this->border_width,
'y' => $ret[1]['y']
);
$ret[0] = array(
'w' => $this->width - $ret[1]['w'] - $ret[2]['w'] - 4*$this->padding - 6*$this->border_width,
'h' => $ret[1]['h'],
'x' => $ret[2]['x'] + $ret[2]['w'] + $this->padding + 2*$this->border_width,
'y' => $ret[1]['y']
);
return $ret;
}
}