<?php
namespace Intervention\Image\Gd\Commands;
use Intervention\Image\Gd\Color;
class TrimCommand extends ResizeCommand
{
/**
* Trims away parts of an image
*
* @param \Intervention\Image\Image $image
* @return boolean
*/
public function execute($image)
{
$base = $this->argument(0)->type('string')->value();
$away = $this->argument(1)->value();
$tolerance = $this->argument(2)->type('numeric')->value(0);
$feather = $this->argument(3)->type('numeric')->value(0);
$width = $image->getWidth();
$height = $image->getHeight();
// default values
$checkTransparency = false;
// define borders to trim away
if (is_null($away)) {
$away = ['top', 'right', 'bottom', 'left'];
} elseif (is_string($away)) {
$away = [$away];
}
// lower border names
foreach ($away as $key => $value) {
$away[$key] = strtolower($value);
}
// define base color position
switch (strtolower($base)) {
case 'transparent':
case 'trans':
$checkTransparency = true;
$base_x = 0;
$base_y = 0;
break;
case 'bottom-right':
case 'right-bottom':
$base_x = $width - 1;
$base_y = $height - 1;
break;
default:
case 'top-left':
case 'left-top':
$base_x = 0;
$base_y = 0;
break;
}
// pick base color
if ($checkTransparency) {
$color = new Color; // color will only be used to compare alpha channel
} else {
$color = $image->pickColor($base_x, $base_y, 'object');
}
$top_x = 0;
$top_y = 0;
$bottom_x = $width;
$bottom_y = $height;
// search upper part of image for colors to trim away
if (in_array('top', $away)) {
for ($y=0; $y < ceil($height/2); $y++) {
for ($x=0; $x < $width; $x++) {
$checkColor = $image->pickColor($x, $y, 'object');
if ($checkTransparency) {
$checkColor->r = $color->r;
$checkColor->g = $color->g;
$checkColor->b = $color->b;
}
if ($color->differs($checkColor, $tolerance)) {
$top_y = max(0, $y - $feather);
break 2;
}
}
}
}
// search left part of image for colors to trim away
if (in_array('left', $away)) {
for ($x=0; $x < ceil($width/2); $x++) {
for ($y=$top_y; $y < $height; $y++) {
$checkColor = $image->pickColor($x, $y, 'object');
if ($checkTransparency) {
$checkColor->r = $color->r;
$checkColor->g = $color->g;
$checkColor->b = $color->b;
}
if ($color->differs($checkColor, $tolerance)) {
$top_x = max(0, $x - $feather);
break 2;
}
}
}
}
// search lower part of image for colors to trim away
if (in_array('bottom', $away)) {
for ($y=($height-1); $y >= floor($height/2)-1; $y--) {
for ($x=$top_x; $x < $width; $x++) {
$checkColor = $image->pickColor($x, $y, 'object');
if ($checkTransparency) {
$checkColor->r = $color->r;
$checkColor->g = $color->g;
$checkColor->b = $color->b;
}
if ($color->differs($checkColor, $tolerance)) {
$bottom_y = min($height, $y+1 + $feather);
break 2;
}
}
}
}
// search right part of image for colors to trim away
if (in_array('right', $away)) {
for ($x=($width-1); $x >= floor($width/2)-1; $x--) {
for ($y=$top_y; $y < $bottom_y; $y++) {
$checkColor = $image->pickColor($x, $y, 'object');
if ($checkTransparency) {
$checkColor->r = $color->r;
$checkColor->g = $color->g;
$checkColor->b = $color->b;
}
if ($color->differs($checkColor, $tolerance)) {
$bottom_x = min($width, $x+1 + $feather);
break 2;
}
}
}
}
// trim parts of image
return $this->modify($image, 0, 0, $top_x, $top_y, ($bottom_x-$top_x), ($bottom_y-$top_y), ($bottom_x-$top_x), ($bottom_y-$top_y));
}
}