Solved

# setting fonts color in RGB

Posted on 2001-09-17
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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..
0
Question by:Landiin
• 4
• 3
• 2
• +3

LVL 14

Expert Comment

rbgRed:=255; //ranges 0..255
//    rbgBlue:=10;
//    rbgGreen:=10;
end;
0

LVL 1

Accepted Solution

Baksa earned 50 total points

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

red := (rgb and \$FF0000) div \$10000;
blue := (rgb and \$FF00) div \$100;
green := rgb and \$FF;
0

LVL 27

Expert Comment

is there not a
function RGBToColor(R:Byte;G:Byte;B:Byte) : TColor;
?
0

LVL 14

Expert Comment

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

there is no RGBToColor function that i have found..
0

LVL 27

Expert Comment

was just a guess,
no delphi on hand yet
:-)
0

LVL 3

Expert Comment

label1.font.Color:=rgb(0,0,255);
0

LVL 5

Expert Comment

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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Author Comment

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

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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Author Comment

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
0

Author Comment

after trying all of yalls exp. I should of used f15iaf his was was so easy
0

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