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setting fonts color in RGB

Posted on 2001-09-17
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Last Modified: 2013-12-03
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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Question by:Landiin
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12 Comments
 
LVL 14

Expert Comment

by:AvonWyss
Comment Utility
with TRGBQuad(YourColor) do begin
    rbgRed:=255; //ranges 0..255
//    rbgBlue:=10;
//    rbgGreen:=10;
end;
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LVL 1

Accepted Solution

by:
Baksa earned 50 total points
Comment Utility

  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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LVL 27

Expert Comment

by:kretzschmar
Comment Utility
is there not a
function RGBToColor(R:Byte;G:Byte;B:Byte) : TColor;
?
0
 
LVL 14

Expert Comment

by:AvonWyss
Comment Utility
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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Author Comment

by:Landiin
Comment Utility
there is no RGBToColor function that i have found..
0
 
LVL 27

Expert Comment

by:kretzschmar
Comment Utility
was just a guess,
no delphi on hand yet
:-)
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LVL 3

Expert Comment

by:f15iaf
Comment Utility
label1.font.Color:=rgb(0,0,255);
0
 
LVL 5

Expert Comment

by:alanwhincup
Comment Utility
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
0
 

Author Comment

by:Landiin
Comment Utility
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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LVL 14

Expert Comment

by:AvonWyss
Comment Utility
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.
0
 

Author Comment

by:Landiin
Comment Utility
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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Author Comment

by:Landiin
Comment Utility
after trying all of yalls exp. I should of used f15iaf his was was so easy
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