Ok below is the fully tested and working code:
NOTE: . I have attached it too so wordwrapping email clients don't stuff the
lines up .. ;-)
This script will take in two 6character HTML hex colours (ie 44F0DD) and
return the "midway" colour between them (in Hex also)..
----------------------
<?php
//Example values..
$bgcol="39DFD9";
$lncol="F02816";
/** Func: getMidColour **/
// Returns the midway value in HEX between the two DEC values $dec1, $dec2
function getMidColour(&$dec1,&$dec2) {
return
dechex(abs(hexdec($dec1)-hexdec($dec2))/2+(hexdec($dec1)>hexdec($dec2)?hexde
c($dec2):hexdec($dec1)));
}
// Parses 6char hex colour (RRGGBB) into 3 part RGB string and feeds into an
array
$bgcol_arr=split(",",preg_replace("/(.{2})(.{2})(.{2})/","$1,$2,$3",$bgcol))
;
$lncol_arr=split(",",preg_replace("/(.{2})(.{2})(.{2})/","$1,$2,$3",$lncol))
;
// We now can access the hex RGB values through the [0],[1],[2] elements of
these arrays..
// Using our custom function we can throw into our final array the actual 3
hex values
// desired which is the midpoint between $bgcol and $lncol
$midcol_arr=Array(getMidColour($bgcol_arr[0],$lncol_arr[0]),getMidColour($bg
col_arr[1],$lncol_arr[1]),getMidColour($bgcol_arr[2],$lncol_arr[2]));
// Formats the array into a string and Upper cases it..
$midcol=strtoupper(join("",$midcol_arr));
?>
---------------------
You then have the $midcol var which holds a uppercase HTML hex colour string
which represents the midway colour between $bgcol and $lncol..
Finally.. :-p
Ok HIH
----- Original Message -----
From: "::[ Julien Bonastre ]::" <[EMAIL PROTECTED]>
To: "::[ Julien Bonastre ]::" <[EMAIL PROTECTED]>
Sent: Thursday, October 10, 2002 12:19 AM
Subject: Re: [PHP] Reversing the Colour.
> Hang on..
>
> Yep I just tested it.
>
> Make sure you incldue the forward slash REGEX seperators in those preg
> functions..
>
> Ie.. my lines in previous email have:
>
$bgcol_arr=split(",",preg_replace("([\d]{2})([\d]{2})([\d]{2})","$1,$2,$3",$
> bgcol));
>
> Which should be:
>
$bgcol_arr=split(",",preg_replace("/([\d]{2})([\d]{2})([\d]{2})/","$1,$2,$3"
> ,$bgcol));
>
>
>
> Anyway...
> ----- Original Message -----
> From: "::[ Julien Bonastre ]::" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Wednesday, October 09, 2002 11:59 PM
> Subject: Re: [PHP] Reversing the Colour.
>
>
> Assumptions:
> - background colour is stored in $bgcol (ie 4592FF)
> - chosen link colour is stored in $lncol (ie *same as above*)
> - Finds "half-way" colour between $bgcol and $lncol (returns a RRGGBB in
hex
> as above)
>
> Notes:
> This is actually fairly simple Alexis.. Simply convert your hex vals to
> something you can work with (ie dec) using hexdec() and then do some basic
> maths to find the half way between each of the R G B vals and then finally
> spitting out a hex value for the midway mark..
>
>
> Implementation:
>
> <?php
> /** Func: getMidColour **/
> // Returns the midway value in HEX between the two DEC values $dec1, $dec2
> function getMidColour(&$dec1,&$dec2) {
> return
>
dechex(abs(hexdec($dec1)-hexdec($dec2))/2+(hexdec($dec1)>hexdec($dec2)?hexde
> c($dec2):hexdec($dec1)));
> }
>
> // Parses 6char hex colour (RRGGBB) into 3 part RGB string and feeds into
an
> array
>
$bgcol_arr=split(",",preg_replace("([\d]{2})([\d]{2})([\d]{2})","$1,$2,$3",$
> bgcol));
>
$lncol_arr=split(",",preg_replace("([\d]{2})([\d]{2})([\d]{2})","$1,$2,$3",$
> lncol));
>
> // We now can access the hex RGB values through the [0],[1],[2] elements
of
> these arrays..
> // Using our custom function we can throw into our final array the actual
3
> hex values
> // desired which is the midpoint between $bgcol and $lncol
>
$midcol_arr=Array(getMidColour($bgcol_arr[0],$lncol_arr[0]),getMidColour($bg
> col_arr[1],$lncol_arr[1]),getMidColour($bgcol_arr[2],$lncol_arr[2]));
>
>
>
>
> -----------------------
>
> HIH.. Not tested.. Please tell me how it goes (if it goes :-p)
>
>
>
> Bye
>
>
> ----- Original Message -----
> From: "Alexis Antonakis" <[EMAIL PROTECTED]>
> To: "Php-General@Lists. Php. Net" <[EMAIL PROTECTED]>
> Sent: Wednesday, October 09, 2002 10:48 PM
> Subject: [PHP] Reversing the Colour.
>
>
> > Hi,
> >
> > I have a site whereby the user can select the colour of links for their
> > individual sections.
> >
> > What I would like to do is to get the exact opposite colour of the one
> that
> > they choose and use that in the 'hover over' option of the <a> tag.
> >
> > The value for the colour is stored in hex.
> >
> > To add to this, the user can also choose the background colour. I have
> made
> > sure that they cannot have the same background colour as colour of the
> link,
> > but obviously if the background colour is the exact opposite of the link
> > colour, then when they hover over the link, it would 'disappear'. In
this
> > case I would like to choose HALFWAY between the two sets of colours. I
> know
> > that this might not always produce the best colour combinations, but I'm
> > trying to get it so that the links always 'stand out'. I cannot let them
> > choose the colour of the 'Hover Over' option unfortunately.
> >
> > Any suggestions as to how to achieve this, especially the calculations,
or
> > for that matter improve upon it, would be most appreciated.
> >
> > Regards
> > Alexis
> >
> >
> >
> > --
> > PHP General Mailing List (http://www.php.net/)
> > To unsubscribe, visit: http://www.php.net/unsub.php
> >
> >
>
>
>
>
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