Perhaps this?
<?
/**
* ColorMatch class
* Version : 1.0
* Author : Jerrett Taylor
* Last Updated : March 1, 2003
*/
class ColorMatch
{
var $default_color = '';
var $colors = Array();
/**
* Constructor. Generates matching colors if passed a color
*/
function ColorMatch($_color='')
{
// Constructor. If passed a color, generate our matching colors
if ($_color) $this->Generate($_color);
}
/**
* returns requested color,or default if color is invalid
* @param $_type type of color to return
* @param $_pos position/number of color to return
* @returns hexidecimal color
*/
function GetColor($_type,$_pos)
{
return ($this->colors[$_type][$_pos]) ? $this->colors[$_type][$_pos] : $this->default_color;
}
/**
* converts a hexidecimal color to HSV Color Model
* @param $hex hexidecimal color
* @returns array( hue, saturation, value )
*/
function hex2hsv ($_hex)
{
$rgb = hexdec(str_replace("#","",$_hex));
list ($_red,$_green,$_blue) = array(($rgb >> 16) & 0xFF, ($rgb >> 8) & 0xFF, $rgb & 0xFF);
// get highest and lowest colors
$max = max($_red,$_green,$_blue);
$min = min($_red,$_green,$_blue);
$v = $max; // 'value' is always the highest value from RGB
$delta = $max-$min; // get midway between highest and lowest, this is our delta!
if ($max == 0) return Array('0','0','0'); // this is black, if the biggest value is 0
$s = 100*($delta/$max); // 'saturation' is our delta divided by max
// see which color is most dominant
if ($_red == $max) $h = @round(( $_green - $_blue ) / $delta); // between yellow & magenta
elseif ($_green == $max) $h = @round(2 + ( $_blue - $_red ) / $delta); // between cyan & yellow
else $h = @round(4 + ( $_red - $_green ) / $delta); // between magenta & cyan
$h*=60; // move into primary/secondary color group
// we can't be having negatives.. if it's in negatives, add 360 (full circle)
$h = ($h < 0) ? $h+=360 : $h;
return Array(ceil($h),ceil($s),ceil(100*($v/255)));
}
/**
* converts a HSV color to hexidecimal
* @param $_hue HSV Hue
* @param $_sat HSV saturation
* @param $_val HSV value
* @returns hexidecimal color (with #)
*/
function hsv2hex($_hue, $_sat, $_val)
{
// safegaurds against invalid values
if ($_hue < 0 ) $_hue+=359; elseif ($_hue > 359) $_hue-=359;
if ($_val > 100) $_val=100; elseif ($_val < 0) $_val = 0;
if ($_sat > 100) $_sat=100; elseif ($_sat < 0) $_sat=0;
if ($_sat == 0) { $_val = floor($_val*2.55); return '#'.str_pad(dechex($_val),2,'0',STR_PAD_LEFT).str_pad(dechex($_val),2,'0',STR_PAD_LEFT).str_pad(dechex($_val),2,'0',STR_PAD_LEFT); } // this is grey
$_hue/=60; // move hue into 1-6 (primary & secondary colors)
$_sat/=100; $_val/=100; // divide by 100 so we are dealing with proper 0.0 - 0.1
$factor = $_hue-floor($_hue); // get fractional part of the hue
// math to get into the 255 range of things from the _sat and _val
$color1 = ceil($_val * (1-$_sat)*255);
$color2 = ceil($_val * (1-($_sat * $factor))*255);
$color3 = ceil($_val * (1-($_sat * (1-$factor)))*255);
$_val = ceil($_val*255);
// return rgb based on which primary/secondary color group we are in
switch (floor($_hue))
{
case 0: $red = $_val; $green = $color3; $blue = $color1; break;
case 1: $red = $color2; $green = $_val; $blue = $color1; break;
case 2: $red = $color1; $green = $_val; $blue = $color3; break;
case 3: $red = $color1; $green = $color2; $blue = $_val; break;
case 4: $red = $color3; $green = $color1; $blue = $_val; break;
case 5: $red = $_val; $green = $color1; $blue = $color2; break;
}
return '#'.str_pad(dechex($red),2,'0',STR_PAD_LEFT).str_pad(dechex($green),2,'0',STR_PAD_LEFT).str_pad(dechex($blue),2,'0',STR_PAD_LEFT);
}
/**
* Gets matching colors. Returns triad colors, complementary colors, Analog colors
* as well as modifications to the color tint, shade, and saturation.
* @param $_hex hexidecimal color
*/
function Generate($_hex)
{
$this->default_color = $_hex;
list($_hue,$_sat,$_val) = $this->hex2hsv($_hex);
// complementary color, and 2 variations in sat/val
$this->colors['complimentary'][1] = $this->hsv2hex($_hue-180,$_sat,$_val);
$this->colors['complimentary'][2] = $this->hsv2hex($_hue-180,$_sat+10,$_val-20);
$this->colors['complimentary'][3] = $this->hsv2hex($_hue-180,$_sat-50,$_val-50);
// triad colors
$this->colors['triad'][1] = $_hex;
$this->colors['triad'][2] = $this->hsv2hex($_hue-120,$_sat,$_val);
$this->colors['triad'][3] = $this->hsv2hex($_hue+120,$_sat,$_val);
// set some vars for modification
$hue = $_hue-45;
$val = ($_val > 75) ? $_val-=25 : $_val;
$val = ($val < 25) ? $val+=25 : $_val;
$sat = $_sat;
// get us some colors!
for ($i=1;$i<=5;$i++)
{
$sat-=15; $val+=5; $hue+=30; // Move along the hsv "color sphere" thingamagig
$this->colors['analogue'][$i] = $this->hsv2hex($hue,$_sat,$_val);
$this->colors['tint'][$i] = $this->hsv2hex($_hue,$_sat,$val);
$this->colors['shade'][$i] = $this->hsv2hex($_hue,$sat,$_val);
$this->colors['saturation'][$i] = $this->hsv2hex($_hue,$sat,$val);
}
// this is a set built from the sat, tint and analog results.
// this could be usefull for generating a theme
$this->colors['set'][1] = $_hex;
$this->colors['set'][2] = $this->colors['saturation'][5];
$this->colors['set'][3] = $this->colors['saturation'][4];
$this->colors['set'][4] = $this->colors['tint'][5];
$this->colors['set'][5] = $this->colors['tint'][3];
$this->colors['set'][6] = $this->colors['tint'][1];
$this->colors['set'][7] = $this->colors['analogue'][3];
$this->colors['set'][8] = $this->colors['analogue'][5];
}
/**
* Dumps out a list of all available colors.
*/
function ShowColors()
{
echo '<style type="text/css">body { background-color:'.$_POST['color'].'}</style>';
echo '<span style="position: absolute; top: 90px; left:15px; width: 190px;">';
foreach($this->colors as $block => $cblock)
{
echo '<span style="height: 10px; width: 190px;"> </span>';
foreach($cblock as $key => $color)
{
echo '<span style="width: 190px;">
<span style="width: 110px; border: 1px solid black; border-right: 0px; display: table-cell; color: #0000ff;padding: 4px; font: 10px verdana; color:#000; background-color:#FFF; font-weight:bold;">'.$block.' '.$key.' </span>
<span style="width: 70px; display: table-cell; border: 1px solid black; padding: 4px; background-color: '.$color.'; text-align:center;font: 10px verdana; color: #000; text-transform: uppercase;">'.$color.'</span>
</span>';
}
}
echo '</span>';
}
}
?>
