Here is my contribution. The "readable opposite" color calculated by this script still lacks a bit readability in some cases and it's only partly tested, but I hope it helps.<?php
class Color
{
const
DEC = 0,
HEX = 1,
LIGHT = 0,
DIM = 2,
ABSOLUTE = 0,
PERCENTAGE = 4,
REFER_TO_MAXIMUM = 0,
REFER_TO_CURRENT = 8;
static public
$HEX_VALUES = array(
0, 1, 2, 3,
4, 5, 6, 7,
8, 9, 'A' => 10, 'B' => 11,
'C' => 12, 'D' => 13, 'E' => 14, 'F' => 15
),
$DEC_VALUES = array(
0, 1, 2, 3,
4, 5, 6, 7,
8, 9, 'A', 'B',
'C', 'D', 'E', 'F'
);
protected
$color = array(
'r' => 0,
'g' => 0,
'b' => 0
);
public function __construct()
{
$args = func_get_args();
call_user_func_array(array($this, 'setColor'), $args);
}
public function setColor($rgb, $mode = self::HEX)
{
if(array_keys($rgb) != array('r', 'g', 'b'))
{
throw new Exception('only "r", "g" or "b" permitted as array keys');
}
foreach($rgb as $cType => $cValue)
{
if($mode & self::HEX)
{
$cValue = self::hexToDec($cValue);
}
$this->color[$cType] = $cValue;
}
}
public function __get($propertyName)
{
if($propertyName == 'color')
{
return $this->color;
}
if(!isset($this->color[$propertyName]))
{
throw new Exception('use of undefined virtual property "'.$propertyName.'"');
}
return $this->color[$propertyName];
}
public function __set($propertyName, $propertyValue)
{
if($propertyName == 'color')
{
$this->setColor($propertyValue, self::DEC);
return;
}
if(!isset($this->color[$propertyName]))
{
throw new Exception('use of undefined virtual property "'.$propertyName.'"');
}
$this->color[$propertyName] = $propertyValue;
}
static public function hexToDec($hex)
{
$dec = 0;
for($i = strlen($hex) - 1, $j = 0; $i >= 0; --$i, $j += 4)
{
$dec += self::$HEX_VALUES[$hex{$i}]<<$j;
}
return $dec;
}
static public function decToHex($dec)
{
$hex = '';
while($dec != 0)
{
$hex .= self::$DEC_VALUES[$dec % 16];
$dec>>=4;
}
return strrev($hex);
}
public function add($rgb, $mode)
{
$this->color = self::calculateColor($this->color, $rgb, $mode);
}
public static function calculateColor($rgbStart, $rgbAdd, $mode)
{
if(array_intersect(array_keys($rgbStart), array_keys($rgbAdd)) != array('r', 'g', 'b'))
{
throw new Exception('only "r", "g" or "b" permitted as array keys');
}
if($mode & self::PERCENTAGE)
{
foreach($rgbAdd as $cType => $cValue)
{
$percentageOf = ($mode & self::REFER_TO_CURRENT) ? $rgbStart[$cType] / 100 : 2.55;
$rgbAdd[$cType] = $percentageOf * $cValue;
}
}
foreach($rgbAdd as $cType => $cValue)
{
if($mode & self::DIM)
{
$cValue *= -1;
}
$rgbStart[$cType] += $cValue;
}
return $rgbStart;
}
public function oppositeColor()
{
$this->color = self::calculateOpposite($this->color, self::DEC);
}
public static function calculateOpposite($rgb, $mode)
{
if(array_keys($rgb) != array('r', 'g', 'b'))
{
throw new Exception('only "r", "g" or "b" permitted as array keys');
}
foreach($rgb as $cType => $cValue)
{
if($mode & self::HEX)
{
$cValue = self::hexToDec($cValue);
}
$rgb[$cType] = 255 - $cValue;
}
return $rgb;
}
public function readableOppositeColor($mode)
{
return self::calculateReadableOpposite($this->color, $mode | self::DEC);
}
public static function calculateReadableOpposite($rgb, $mode)
{
$rgb = self::calculateOpposite($rgb, $mode);
foreach($rgb as $cType => $cValue)
{
if($cValue > 98 && $cValue < 158)
{
$rgb[$cType] = ($cValue - 128 < 0) ? 98 : 158;
}
}
return $rgb;
}
public function __toString()
{
return self::colorToString($this->color, self::DEC);
}
public static function colorToString($rgb, $mode)
{
if(array_keys($rgb) != array('r', 'g', 'b'))
{
throw new Exception('only "r", "g" or "b" permitted as array keys');
}
foreach($rgb as $cType => $cValue)
{
if($mode & self::HEX)
{
break;
}
if($cValue < 0)
{
$cValue = 0;
}
elseif($cValue > 255)
{
$cValue = 255;
}
$rgb[$cType] = self::fillHex(self::decToHex((int) $cValue));
}
return $rgb['r'].$rgb['g'].$rgb['b'];
}
protected static function fillHex($hex)
{
return str_pad($hex, 2, '0', STR_PAD_LEFT);
}
}
$menus = array(
'Services' => array(
'Service1' => array(),
'Service2' => array(
'S2 Sub1' => array(
'S2 Sub1.1' => array(),
'S2 Sub1.2' => array(
'S2 Sub1.2.1' => array(),
'S2 Sub1.2.2' => array(
'S2 Sub1.2.2.1' => array(),
'S2 Sub1.2.2.2' => array()
)
)
),
'S2 Sub2' => array()
),
'Service 3' => array()
)
);
function showMenus($menus, $color)
{
$bColor = Color::calculateColor(
$color,
array(
'r' => 10,
'g' => 10,
'b' => 10
),
Color::DEC | Color::PERCENTAGE
);
$textColor = Color::colorToString(Color::calculateReadableOpposite($bColor, Color::DEC), Color::DEC);
$backgroundColor = Color::colorToString($bColor, Color::DEC);
foreach($menus as $subMenu => $subMenus)
{
echo '<div style="color:#',$textColor,';background-color:#',$backgroundColor,';">',$subMenu;
showMenus($subMenus, $bColor);
echo '</div>';
}
}
?>
<html>
<head>
<title>Submenus</title>
<style type="text/css">
div
{
padding:0.5em;
margin:0.5em;
}
</style>
</head>
<body>
<?php
showMenus(
$menus,
array(
'r' => '9A',
'g' => '9A',
'b' => '00'
)
);
?>
</body>
</html>dumpfi