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Keep same colors algorithm

Posted on 2004-10-11
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Last Modified: 2010-04-05
I have for my button a color Color1 ( ex: $005200A4 ) . For border Color2 ( ex.$0036006C) and Color3 ( ex: $009428FF ).

The color2 is a dark Color1 and Color3 is the light Color1.

I wish to get instantly Color2/Color3 when change Color1 to have omolog dark/light color for the new Color1. Same darkness/lightness scale.

How to do that?
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Question by:ginsonic
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LVL 7

Expert Comment

by:LRHGuy
ID: 12278264
The lower the number the "darker" the color (I think).

  $52  $00  $A4  is color 1
  $36  $00  $6C  is color2 (darker, lower numbers)
 -$1C -$00 -$38  subtract from normal color to get darker ... lowest number should be $00

  $94  $28  $FF  is color3 (lighter, higher numbers)
 +$42 +$28 +$5B  add to normal color to get lighter ... highest number should be $FF

You do need to deal with each piece of the color separately, as shown.

Just a thought...
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Accepted Solution

by:
LRHGuy earned 2000 total points
ID: 12278394
This seems to work for me. You might want to play with the values being added/subtracted to get a good contrast...

type
  c1=record
      case integer of
       0:( p:array[0..3] of byte);
       1:(l:longint)
    end;

procedure MakeColors(aOrig:tColor; var aLighter, aDarker:TColor);
var
  C,L,D:c1;
  function Lighter(orig,add:byte):byte;
  begin
{$R-}
    result:=orig+add;
    if result<orig then
      result:=$ff; {full bright}
{$R+}
  end;
  function Darker(orig,add:byte):byte;
  begin
{$R-}
    result:=orig-add;
    if result>orig then
      result:=$00; {full dark}
{$R+}
  end;
begin
  C.l:=aOrig;
// make lighter color
  L.L:=C.L;
  L.p[1]:=lighter(C.p[1],$5B);
  L.p[2]:=lighter(C.p[2],$28);
  L.p[3]:=lighter(C.p[3],$42);
  aLighter:=L.L;
// make darker color
  D.L:=C.L;
  D.p[1]:=darker(C.p[1],$1c);
  D.p[2]:=darker(C.p[2],$1c);
  D.p[3]:=darker(C.p[3],$38);
  aDarker:=D.l;
end;

procedure TForm2.Button1Click(Sender: TObject);
var
  C,L,D:tColor;
begin
  self.color:=clYellow;
  makecolors(Self.Color,L,D);
  panel1.color:=L;
  radiogroup1.color:=D;
end;
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