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setting fonts color in RGB

How would i change the font color if i only wanted to change the red value in the rgb value and the same for green and blue..
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Landiin
Asked:
Landiin
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1 Solution
 
AvonWyssCommented:
with TRGBQuad(YourColor) do begin
    rbgRed:=255; //ranges 0..255
//    rbgBlue:=10;
//    rbgGreen:=10;
end;
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BaksaCommented:

  rgb := (red * $10000) + blue *$100 + green;

  red := (rgb and $FF0000) div $10000;
  blue := (rgb and $FF00) div $100;
  green := rgb and $FF;
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kretzschmarCommented:
is there not a
function RGBToColor(R:Byte;G:Byte;B:Byte) : TColor;
?
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AvonWyssCommented:
No, there's a ColorToRGB withi will take a TColor and convert a system color to a RGB color if needed. And it would not help to *change* just a part of a color.
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LandiinAuthor Commented:
there is no RGBToColor function that i have found..
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kretzschmarCommented:
was just a guess,
no delphi on hand yet
:-)
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f15iafCommented:
label1.font.Color:=rgb(0,0,255);
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alanwhincupCommented:
If i am understanding you correctly, you want to change each rgb value indepently with out changing the other 2 e.g change red without changing the green and blue values. You could do it like this:

function ChangeColor(FColor : TColor; R, G, B : Integer) : TColor;
var
  I : Integer;
  Red, Green, Blue : Byte;
begin
  I := ColorToRGB(FColor);
  I := Integer(GetNearestColor(FColor, I));
  if R >= 0 then Red := R else Red := GetRValue(I);
  if G >= 0 then Green := G else Green := GetGValue(I);
  if B >= 0 then Blue := B else Blue := GetBValue(I);
  Result := RGB(Red, Green, Blue);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Label1.Font.Color := ChangeColor(Label1.Font.Color, 255, -1, -1);
end;

the colors you dont want to change have to have a integer below 0 when calling to the function so that it knows you don't want to change them. The example shown above will keep the Green and Blue values the same and will just change the red value.

Cheers,

Alan
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LandiinAuthor Commented:
Thx for all the fast good good comments. I had to go with
Baksa because that comment made me come up with this:

Label1.Font.Color := StrToInt('$00'+IntToHex(Red,2)+IntToHex(Green,2)+IntToHex(Blue,2));

Thx for the push in the correct direction Baksa
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AvonWyssCommented:
Landiin, this solutions of yours is about the worst you could come up with; converting numeric values to hex strings, concatenating them back together and converting it back to a numberic value is VERY inefficient. Baska's solution was *much* better, and mine (posted first also) would probably have been the fastest with no computations whatsoever.
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LandiinAuthor Commented:
AvonWyss you are correct about all the converting. It was just to simple to pass up, ans speet didn't matter. I am just starting out with delphie and programming all together. I didn't understand your comment but I am sure its the fastest, I wouldn't know. All in all you all help a great deal and I learned something... thx again
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LandiinAuthor Commented:
after trying all of yalls exp. I should of used f15iaf his was was so easy
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