 dlite922  1,584
Recognized Expert Top Contributor
I spent a couple hours on this and wanted to save someone else a few hours.
This function takes a percentage value and calculates the RGB color. This is useful for a graph or table in which you want the background or some other indicator to change based on the value.
The problem I spent most of my time on was the loss of yellow.
The code is documented and should be easy to understand. Post any questions or modifications to this post.
License: GPL Public -
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/**
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* Example of use of percent2Color function
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* @author Dan M
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* @date 06/24/2010
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*
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*
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*/
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-
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/**
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* This function takes a value and returns an RGB color between Red to Yellow to Green in a given spectrum.
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* 50% = FFFF00
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*
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* @param mixed $value required
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* @param mixed $brightness value between 1 and 255
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* @param mixed $max default 100
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* @param mixed $min default 0
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* @param mixed $thirdColorHex '00'
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*/
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function percent2Color($value,$brightness = 255, $max = 100,$min = 0, $thirdColorHex = '00')
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{
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// Calculate first and second color (Inverse relationship)
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$first = (1-($value/$max))*$brightness;
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$second = ($value/$max)*$brightness;
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// Find the influence of the middle color (yellow if 1st and 2nd are red and green)
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$diff = abs($first-$second);
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$influence = ($brightness-$diff)/2;
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$first = intval($first + $influence);
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$second = intval($second + $influence);
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// Convert to HEX, format and return
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$firstHex = str_pad(dechex($first),2,0,STR_PAD_LEFT);
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$secondHex = str_pad(dechex($second),2,0,STR_PAD_LEFT);
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return $firstHex . $secondHex . $thirdColor ;
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// alternatives:
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// return $thirdColorHex . $firstHex . $secondHex;
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// return $firstHex . $thirdColorHex . $secondHex;
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}
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The code is bloated to make it easier to understand for beginners. I know I could have cut corners. It also needs some error checking (e.g. brightness must be between 1 and 255).
If you would like to compact it or add to it, go ahead and post the new version back! You can also change the affecting pair from red-green to green-blue or blue-red with a red hue or green hue as alternative if you want.
Cheers,
Dan M.
Example of use: -
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<html>
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<body>
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<table width="300px">
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<tr><td>Percent</td><td>Color</td></tr>
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<?php
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$example = array(10,40,28,69,100,0,50);
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foreach($example as $x)
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{
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$color = percent2Color($x,$brightness = 200);
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echo "<tr><td>$x</td><td style='background-color:#$color'>$color</td>";
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}
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?>
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</table>
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</body>
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</html>
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</html>
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