random color gereation

Anon

I need to write a script that displays 100 random colors using a 'for loop'. The colors should span the range 000000 to ffffff...please help

khaine

to create the colors as blocks. You could set up image.php something like.

header("Content-type: images/png");

$im=imagecreate(15, 15) or die("Cannot create");

srand((double) microtime() * 1000000);
$rc=rand(1, 255);
$gc=rand(1, 255);
$bc=rand(1, 255);

$background_color=imagecolorallocate($im, $rc, $gc, $bc);
$text_color=imagecolorallocate($im, 255, 255, 255);
imagestring($im, 1, 5, 5, "", $text_color);
imagepng($im);

then set up a for loop to create the html and put <IMG src="image.php">. Each time the image.php is called it will create a small colored block as an image.

Mark.

Anon

thanks for replying....i'm very new to php....what i would like to do is somehow generate 3 random numbers then change it into hexadecimal format and use 'for loops' to generate the color band...any ideas??

khaine

what you need is a decimal to hex converter.

Something like this should do what you want.

function tohex(numin)
{
$new=sprintf("%02X", $numin);
return($new);
}

then in you main program something like.

srand((double) microtime() * 1000000);
for ( $temp=0; $temp<100; $tmep++ )
{
$rc=tohex(rand(1, 255));
$gc=tohex(rand(1, 255));
$bc=tohex(rand(1, 255));
$col="#".$rc.$gc.$bc;

// whatever you want to do with the color.
// $col now holds the html hex value of a color.

}

hope that helps.

Mark.

khaine

oops type-o in there the function should be

khaine

aarrgghh wrong button. try again.

the program should be.

<?php

function tohex($numin)
{
$new=sprintf("%02X", $numin);
return($new);
}

srand((double) microtime() * 1000000);
for ( $temp=0; $temp<100; $tmep++ )
{
$rc=tohex(rand(1, 255));
$gc=tohex(rand(1, 255));
$bc=tohex(rand(1, 255));
$col="#".$rc.$gc.$bc;

// whatever you want to do with the color.
// $col now holds the html hex value of a color.

}

I missed the $ on the variable for the function.

Mark.