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<?php
/**
* ezcGraphColor
*
* Struct for representing colors in ezcGraph. A color is defined using the
* common RGBA model with integer values between 0 and 255. An alpha value
* of zero means full opacity, while 255 means full transparency.
*/
class ezcGraphColor
{
/**
* Red color value.
*
* Contains a value between 0 and 255
*
* @var integer
*/
public $red = 0;
/**
* Green color value.
*
* Contains a value between 0 and 255
*
* @var integer
*/
public $green = 0;
/**
* Blue color value.
*
* Contains a value between 0 and 255
*
* @var integer
*/
public $blue = 0;
/**
* Alpha color value.
*
* Contains a value between 0 and 255. 0 means full opacity and 255 full
* transparency.
*
* @var integer
*/
public $alpha = 0;
/**
* Empty constructor
*/
public function __construct()
{
}
/**
* Throws a BasePropertyNotFound exception.
*/
public function __set( $name, $key )
{
throw new ezcBasePropertyNotFoundException( $name );
}
/**
* Throws a BasePropertyNotFound exception.
*/
public function __get( $name )
{
throw new ezcBasePropertyNotFoundException( $name );
}
/**
* Creates an ezcGraphColor object from a hexadecimal color representation
*
* @param mixed $string Hexadecimal color representation
* @return ezcGraphColor
*/
static public function fromHex( $string )
{
// Remove trailing #
if ( $string[0] === '#' )
{
$string = substr( $string, 1 );
}
// Iterate over chunks and convert to integer
$color = new ezcGraphColor();
$keys = array( 'red', 'green', 'blue', 'alpha' );
foreach ( str_split( $string, 2) as $nr => $hexValue )
{
if ( isset( $keys[$nr] ) )
{
$key = $keys[$nr];
$color->$key = hexdec( $hexValue ) % 256;
}
}
// Set missing values to zero
for ( ++$nr; $nr < count( $keys ); ++$nr )
{
$key = $keys[$nr];
$color->$key = 0;
}
return $color;
}
/**
* Creates an ezcGraphColor object from an array of integers
*
* @param array $array Array of integer color values
* @return ezcGraphColor
*/
static public function fromIntegerArray( array $array )
{
// Iterate over array elements
$color = new ezcGraphColor();
$keys = array( 'red', 'green', 'blue', 'alpha' );
$nr = 0;
foreach ( $array as $colorValue )
{
if ( isset( $keys[$nr] ) )
{
$key = $keys[$nr++];
$color->$key = ( (int) $colorValue ) % 256;
}
}
// Set missing values to zero
for ( ++$nr; $nr < count( $keys ); ++$nr )
{
$key = $keys[$nr];
$color->$key = 0;
}
return $color;
}
/**
* Creates an ezcGraphColor object from an array of floats
*
* @param array $array Array of float color values
* @return ezcGraphColor
*/
static public function fromFloatArray( array $array )
{
// Iterate over array elements
$color = new ezcGraphColor();
$keys = array( 'red', 'green', 'blue', 'alpha' );
$nr = 0;
foreach ( $array as $colorValue )
{
if ( isset( $keys[$nr] ) )
{
$key = $keys[$nr++];
$color->$key = ( (float) $colorValue * 255 ) % 256;
}
}
// Set missing values to zero
for ( ++$nr; $nr < count( $keys ); ++$nr )
{
$key = $keys[$nr];
$color->$key = 0;
}
return $color;
}
/**
* Tries to detect type of color color definition and returns an
* ezcGraphColor object
*
* @param mixed $color Some kind of color definition
* @return ezcGraphColor
*/
static public function create( $color )
{
if ( is_string( $color ) )
{
return ezcGraphColor::fromHex( $color );
}
elseif ( is_array( $color ) )
{
$testElement = reset( $color );
if ( is_int( $testElement ) )
{
return ezcGraphColor::fromIntegerArray( $color );
}
else
{
return ezcGraphColor::fromFloatArray( $color );
}
}
else
{
throw new ezcGraphUnknownColorDefinitionException( $color );
}
}
/**
* Darkens the color
*
* @param float $value Percent to darken the color
* @return void
*/
public function darken( $value )
{
$color = clone $this;
$value = 1 - $value;
$color->red *= $value;
$color->green *= $value;
$color->blue *= $value;
return $color;
}
}
?>
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