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Posted by Toby Inkster on 11/22/06 10:53
cwdjrxyz wrote:
> function MakeArray(n){
> this.length=n;
> for(var i=1; n>=i; i++) this[i]=i-1;
> return this
> }
>
> hex=new MakeArray(16);
> hex[11]="A"; hex[12]="B"; hex[13]="C"; hex[14]="D"; hex[15]="E";
> hex[16]="F";
>
> function ToHex(x){ // Changes a int to hex (in the range 0
> to 255)
> var high=x/16;
> var s=high+""; //1
> s=s.substring(0,2); //2 the combination of these are the
> same as the trunc function
> high=parseInt(s,10); //3
> var left=hex[high+1]; // left part of the hex-value
> var low=x-high*16; // calculate the rest of the values
> s=low+""; //1
> s=s.substring(0,2); //2 the combination of these are the
> same as the trunc function
> low=parseInt(s,10); //3
> var right=hex[low+1]; // right part of the hex-value
> var string=left+""+right; // add the high and low together
> return string;
> }
You base your entire argument on the "fact" that converting from decimal
to hexadecimal in Javascript is hard. It's not.
var r = 196; // red value in decimal
var g = 128; // green value in decimal
var b = 255; // blue value in decimal
var total = (256*256*r) + (256*g) + b; // combine
var hexcolour = "#" + total.toString(16); // ToHex
Your rainbow script, using hexadecimal notation is:
function paint(blah)
{
c1=255; x=blah.length; f=c1/x; c0=255;
for (i=0;x>i;i++)
{
c1=Math.round(255*Math.sin(i/(x/3)));
c2=Math.round(f*i);
total = (256*256*c0) + (256*c1) + c2;
hexcolour = "#" + total.toString(16);
document.write('<span style="color:' + hexcolour + '">'
+ blah.substring(i,i+1) + '<\/span>');
}
}
Easy.
--
Toby A Inkster BSc (Hons) ARCS
Contact Me ~ http://tobyinkster.co.uk/contact
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