Menu
Community /Pin to ProfileBookmark
@NogDogNov 21.2013 — #Just a proof of concept to show how you can use [s]printf() to handle the output, while working with decimal values:
How do I use a for loop to step thru a hex range and display color ?
Hi,
I am trying to display different colors in sequence
in batches of 100 at a time.
Reason is to make selecting a color quicker.
I want to be able to input a starting hex number for the color
and then the script should increment logically from that point
I have started this but got stuck on the
hexedecimal iteration …
This is my code
[code=php]<?php
/* color_test.php
*/
?>
<!DOCTYPE HTML>
<html>
<head>
<title>Auto Colour</title>
<meta name=”keywords” content=”Auto Colour”>
<meta name=”description” content=”Auto Colour”>
<meta name=”revisit-after” content=”2 days”>
<meta name=”robots” content=”all, index, follow”>
<meta name=”author” content=”SimplePage.net”>
<meta name=”Rating” content=”General”>
<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″>
<link rel=”shortcut icon” href=”/sys_images/favicon.png” type=’image/png’>
<link rel=”icon” href=”/sys_images/favicon.png” type=’image/png’>
<style type=”text/css” media=”all”>
<?php
echo ”
section{
display:block;
position:absolute;
top:20px;
left:100px;
width:400px;
background:white;
}
</style>”;
?>
</head>
<body>
<?php
for ($i = 0; $i < 100 $i=$i++) {
$top_pos1 = (($i-1)*20)+20;
$top_pos1px = $top_pos1.’px’;
$hex1_start_1 = ‘B’; // THESE WOULD BE PART OF INPUT START COLOR HEX
$hex1_start_2 = ‘3’;
$hex2_start_1 = ‘B’; // THESE WOULD BE PART OF INPUT START COLOR HEX
$hex2_start_2 = ‘3’;
$hex3_start_1 = ‘B’; // THESE WOULD BE PART OF INPUT START COLOR HEX
$hex3_start_2 = ‘3’;
$col_hex1a = $hex1_start_2 + // some function of $i or a diff for loop var ??
/// I NEED TO DO THE ABOVE FOR EACH OF THE 3 PARTS OF THE COLOR. !!
$col_hex1 = $col_hex1a.$col_hex1b; // runs thru 0-9 then A-H
$col_hex2 = $col_hex2a.$col_hex2b;
$col_hex3 = $col_hex3a.$col_hex3b;
$hex_color = ‘#’.$col_hex1.$col_hex2.$col_hex3;
echo ”
<section style=”top:$top_pos1px;”>
<span style=”margin:0 0 0 40px; color:$hex_color;font-size:24px;”>This is color no:$i $hex_color</span>
</section>
“;
}
?>
</body>
</html>
So the hard bit is incrementing 0-H on one set of the number hex code
then incrementing the second set etc.
Hmmm . ..
Would appreciate some ideas on how I can do this ?
Thanks.
.
Sign in
to post a comment4 Comments(s) ↴
0
@NogDogNov 21.2013 — #Just a proof of concept to show how you can use [s]printf() to handle the output, while working with decimal values:[code=php]
<?php
$hexValue = '00CC99';
$decValue = hexdec($hexValue);
$min = max(0, $decValue - 30);
$max = min(hexdec('FFFFFF'), $decValue + 30);
foreach(range($min, $max) as $color) {
printf('%06X'.PHP_EOL, $color);
}
[/code]