<?php
namespace Intervention\Image\Imagick;
use Intervention\Image\AbstractColor;
class Color extends AbstractColor
{
/**
* ImagickPixel containing current color information
*
* @var \ImagickPixel
*/
public $pixel;
/**
* Initiates color object from integer
*
* @param int $value
* @return \Intervention\Image\AbstractColor
*/
public function initFromInteger($value)
{
$a = ($value >> 24) & 0xFF;
$r = ($value >> 16) & 0xFF;
$g = ($value >> 8) & 0xFF;
$b = $value & 0xFF;
$a = $this->rgb2alpha($a);
$this->setPixel($r, $g, $b, $a);
}
/**
* Initiates color object from given array
*
* @param array $value
* @return \Intervention\Image\AbstractColor
*/
public function initFromArray($array)
{
$array = array_values($array);
if (count($array) == 4) {
// color array with alpha value
list($r, $g, $b, $a) = $array;
} elseif (count($array) == 3) {
// color array without alpha value
list($r, $g, $b) = $array;
$a = 1;
}
$this->setPixel($r, $g, $b, $a);
}
/**
* Initiates color object from given string
*
* @param string $value
*
* @return \Intervention\Image\AbstractColor
*/
public function initFromString($value)
{
if ($color = $this->rgbaFromString($value)) {
$this->setPixel($color[0], $color[1], $color[2], $color[3]);
}
}
/**
* Initiates color object from given ImagickPixel object
*
* @param ImagickPixel $value
*
* @return \Intervention\Image\AbstractColor
*/
public function initFromObject($value)
{
if (is_a($value, '\ImagickPixel')) {
$this->pixel = $value;
}
}
/**
* Initiates color object from given R, G and B values
*
* @param int $r
* @param int $g
* @param int $b
*
* @return \Intervention\Image\AbstractColor
*/
public function initFromRgb($r, $g, $b)
{
$this->setPixel($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 $a
*
* @return \Intervention\Image\AbstractColor
*/
public function initFromRgba($r, $g, $b, $a)
{
$this->setPixel($r, $g, $b, $a);
}
/**
* Calculates integer value of current color instance
*
* @return int
*/
public function getInt()
{
$r = $this->getRedValue();
$g = $this->getGreenValue();
$b = $this->getBlueValue();
$a = intval(round($this->getAlphaValue() * 255));
return intval(($a << 24) + ($r << 16) + ($g << 8) + $b);
}
/**
* Calculates hexadecimal value of current color instance
*
* @param string $prefix
*
* @return string
*/
public function getHex($prefix = '')
{
return sprintf('%s%02x%02x%02x', $prefix,
$this->getRedValue(),
$this->getGreenValue(),
$this->getBlueValue()
);
}
/**
* Calculates RGB(A) in array format of current color instance
*
* @return array
*/
public function getArray()
{
return [
$this->getRedValue(),
$this->getGreenValue(),
$this->getBlueValue(),
$this->getAlphaValue()
];
}
/**
* Calculates RGBA in string format of current color instance
*
* @return string
*/
public function getRgba()
{
return sprintf('rgba(%d, %d, %d, %.2F)',
$this->getRedValue(),
$this->getGreenValue(),
$this->getBlueValue(),
$this->getAlphaValue()
);
}
/**
* Determines if current color is different from given color
*
* @param AbstractColor $color
* @param int $tolerance
* @return boolean
*/
public function differs(AbstractColor $color, $tolerance = 0)
{
$color_tolerance = round($tolerance * 2.55);
$alpha_tolerance = round($tolerance);
$delta = [
'r' => abs($color->getRedValue() - $this->getRedValue()),
'g' => abs($color->getGreenValue() - $this->getGreenValue()),
'b' => abs($color->getBlueValue() - $this->getBlueValue()),
'a' => abs($color->getAlphaValue() - $this->getAlphaValue())
];
return (
$delta['r'] > $color_tolerance or
$delta['g'] > $color_tolerance or
$delta['b'] > $color_tolerance or
$delta['a'] > $alpha_tolerance
);
}
/**
* Returns RGB red value of current color
*
* @return int
*/
public function getRedValue()
{
return intval(round($this->pixel->getColorValue(\Imagick::COLOR_RED) * 255));
}
/**
* Returns RGB green value of current color
*
* @return int
*/
public function getGreenValue()
{
return intval(round($this->pixel->getColorValue(\Imagick::COLOR_GREEN) * 255));
}
/**
* Returns RGB blue value of current color
*
* @return int
*/
public function getBlueValue()
{
return intval(round($this->pixel->getColorValue(\Imagick::COLOR_BLUE) * 255));
}
/**
* Returns RGB alpha value of current color
*
* @return float
*/
public function getAlphaValue()
{
return round($this->pixel->getColorValue(\Imagick::COLOR_ALPHA), 2);
}
/**
* Initiates ImagickPixel from given RGBA values
*
* @return \ImagickPixel
*/
private function setPixel($r, $g, $b, $a = null)
{
$a = is_null($a) ? 1 : $a;
return $this->pixel = new \ImagickPixel(
sprintf('rgba(%d, %d, %d, %.2F)', $r, $g, $b, $a)
);
}
/**
* Returns current color as ImagickPixel
*
* @return \ImagickPixel
*/
public function getPixel()
{
return $this->pixel;
}
/**
* Calculates RGBA integer alpha value into float value
*
* @param int $value
* @return float
*/
private function rgb2alpha($value)
{
// (255 -> 1.0) / (0 -> 0.0)
return (float) round($value/255, 2);
}
}
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