<?php
namespace Intervention\Image;
use Intervention\Image\Exception\NotReadableException;
use Intervention\Image\Exception\NotSupportedException;
abstract class AbstractColor
{
/**
* Initiates color object from integer
*
* @param int $value
* @return \Intervention\Image\AbstractColor
*/
abstract public function initFromInteger($value);
/**
* Initiates color object from given array
*
* @param array $value
* @return \Intervention\Image\AbstractColor
*/
abstract public function initFromArray($value);
/**
* Initiates color object from given string
*
* @param string $value
* @return \Intervention\Image\AbstractColor
*/
abstract public function initFromString($value);
/**
* Initiates color object from given ImagickPixel object
*
* @param ImagickPixel $value
* @return \Intervention\Image\AbstractColor
*/
abstract public function initFromObject($value);
/**
* Initiates color object from given R, G and B values
*
* @param int $r
* @param int $g
* @param int $b
* @return \Intervention\Image\AbstractColor
*/
abstract public function initFromRgb($r, $g, $b);
/**
* Initiates color object from given R, G, B and A values
*
* @param int $r
* @param int $g
* @param int $b
* @param float $a
* @return \Intervention\Image\AbstractColor
*/
abstract public function initFromRgba($r, $g, $b, $a);
/**
* Calculates integer value of current color instance
*
* @return int
*/
abstract public function getInt();
/**
* Calculates hexadecimal value of current color instance
*
* @param string $prefix
* @return string
*/
abstract public function getHex($prefix);
/**
* Calculates RGB(A) in array format of current color instance
*
* @return array
*/
abstract public function getArray();
/**
* Calculates RGBA in string format of current color instance
*
* @return string
*/
abstract public function getRgba();
/**
* Determines if current color is different from given color
*
* @param AbstractColor $color
* @param int $tolerance
* @return boolean
*/
abstract public function differs(AbstractColor $color, $tolerance = 0);
/**
* Creates new instance
*
* @param mixed $value
*/
public function __construct($value = null)
{
$this->parse($value);
}
/**
* Parses given value as color
*
* @param mixed $value
* @return \Intervention\Image\AbstractColor
*/
public function parse($value)
{
switch (true) {
case is_string($value):
$this->initFromString($value);
break;
case is_int($value):
$this->initFromInteger($value);
break;
case is_array($value):
$this->initFromArray($value);
break;
case is_object($value):
$this->initFromObject($value);
break;
case is_null($value):
$this->initFromArray([255, 255, 255, 0]);
break;
default:
throw new NotReadableException(
"Color format ({$value}) cannot be read."
);
}
return $this;
}
/**
* Formats current color instance into given format
*
* @param string $type
* @return mixed
*/
public function format($type)
{
switch (strtolower($type)) {
case 'rgba':
return $this->getRgba();
case 'hex':
return $this->getHex('#');
case 'int':
case 'integer':
return $this->getInt();
case 'array':
return $this->getArray();
case 'obj':
case 'object':
return $this;
default:
throw new NotSupportedException(
"Color format ({$type}) is not supported."
);
}
}
/**
* Reads RGBA values from string into array
*
* @param string $value
* @return array
*/
protected function rgbaFromString($value)
{
$result = false;
// parse color string in hexidecimal format like #cccccc or cccccc or ccc
$hexPattern = '/^#?([a-f0-9]{1,2})([a-f0-9]{1,2})([a-f0-9]{1,2})$/i';
// parse color string in format rgb(140, 140, 140)
$rgbPattern = '/^rgb ?\(([0-9]{1,3}), ?([0-9]{1,3}), ?([0-9]{1,3})\)$/i';
// parse color string in format rgba(255, 0, 0, 0.5)
$rgbaPattern = '/^rgba ?\(([0-9]{1,3}), ?([0-9]{1,3}), ?([0-9]{1,3}), ?([0-9.]{1,4})\)$/i';
if (preg_match($hexPattern, $value, $matches)) {
$result = [];
$result[0] = strlen($matches[1]) == '1' ? hexdec($matches[1].$matches[1]) : hexdec($matches[1]);
$result[1] = strlen($matches[2]) == '1' ? hexdec($matches[2].$matches[2]) : hexdec($matches[2]);
$result[2] = strlen($matches[3]) == '1' ? hexdec($matches[3].$matches[3]) : hexdec($matches[3]);
$result[3] = 1;
} elseif (preg_match($rgbPattern, $value, $matches)) {
$result = [];
$result[0] = ($matches[1] >= 0 && $matches[1] <= 255) ? intval($matches[1]) : 0;
$result[1] = ($matches[2] >= 0 && $matches[2] <= 255) ? intval($matches[2]) : 0;
$result[2] = ($matches[3] >= 0 && $matches[3] <= 255) ? intval($matches[3]) : 0;
$result[3] = 1;
} elseif (preg_match($rgbaPattern, $value, $matches)) {
$result = [];
$result[0] = ($matches[1] >= 0 && $matches[1] <= 255) ? intval($matches[1]) : 0;
$result[1] = ($matches[2] >= 0 && $matches[2] <= 255) ? intval($matches[2]) : 0;
$result[2] = ($matches[3] >= 0 && $matches[3] <= 255) ? intval($matches[3]) : 0;
$result[3] = ($matches[4] >= 0 && $matches[4] <= 1) ? $matches[4] : 0;
} else {
throw new NotReadableException(
"Unable to read color ({$value})."
);
}
return $result;
}
}
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