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Unit Unit1;
{$mode objfpc}{$H+}
Interface
Uses
Classes, Sysutils, Fileutil, Forms, Controls, Graphics, Dialogs, ExtCtrls, StdCtrls, ComCtrls,
LCLType, Math;
Type
{ Tform1 }
Tform1 = Class(Tform)
edtText : Tedit;
Label1 : Tlabel;
Label2 : Tlabel;
pnlView : Tpanel;
tbPosY : Ttrackbar;
tbColorMix : Ttrackbar;
Procedure Formcreate(Sender : Tobject);
Procedure Formshow(Sender : Tobject);
Procedure Tbposychange(Sender : Tobject);
Private
Public
BmpText, BmpFond, BmpOut : TBitmap;
procedure UpdateView;
procedure DoDrawTheText;
End;
type
TRGBTripleArray = array[0..32767] of TRGBTriple;
PRGBTripleArray = ^TRGBTripleArray;
Var
Form1 : Tform1;
Implementation
{$R *.lfm}
{ Tform1 }
Procedure Tform1.Formcreate(Sender : Tobject);
Begin
BmpFond := TBitmap.Create;
BmpFond.SetSize(400,128);
BmpFond.PixelFormat := pf24Bit;
With BmpFond.Canvas do
begin
Brush.Style := bsSolid;
Brush.Color := clBlue;
FillRect(0,0,400,128);
End;
BmpText := TBitmap.Create;
BmpText.SetSize(400,128);
BmpText.PixelFormat := pf24Bit;
BmpOut := TBitmap.Create;
BmpOut.SetSize(400,128);
BmpOut.PixelFormat := pf24Bit;
End;
Procedure Tform1.Formshow(Sender : Tobject);
Begin
UpdateView;
End;
Procedure Tform1.Tbposychange(Sender : Tobject);
Begin
UpdateView;
End;
procedure TForm1.DoDrawTheText;
Var
aTextStyle : TTextStyle;
begin
BmpText.BeginUpdate(True);
With BmpText.Canvas do
begin
Clear;
Brush.Style := bsSolid;
Brush.Color := clWhite;
FillRect(0,0,400,128);
Font.Color := clYellow;
With aTextStyle do
begin
Alignment := taCenter;
Layout :=tlTop;
SingleLine := False;
WordBreak := True;
Opaque := True;
RightToLeft := False;
SystemFont := True;
EndEllipsis := True;
End;
Brush.Style := bsClear;
Brush.Color := clNone;
TextRect(Rect(4,0,396,120),4,tbPosY.Position,edtText.Text,aTextStyle);
End;
BmpText.EndUpdate();
end;
Procedure Tform1.Updateview;
const
Seuil = 85; // = 255 div 3
var
CT : pRGBTripleArray; // Couleur pixel Texte
CF, CR : pRGBTripleArray; // Couleur pixel Fond
x, y : integer;
MaxX, MaxY : integer;
function ColorMix(AColor,BColor:TRGBTriple;const Percent : single):TRGBTriple;
var
pct:single;
function ClampByte(const Value: Integer): Byte;
begin
if Value > 255 then
Result := 255
else
if Value < 0 then
Result := 0
else
Result := Value;
end;
begin
pct:=100-Percent;
result.rgbtRed := ClampByte(round( ((AColor.rgbtRed/100) *pct) + ((BColor.rgbtRed/100) *Percent) ));
result.rgbtGreen := ClampByte(round( ((AColor.rgbtGreen/100)*pct) + ((BColor.rgbtGreen/100)*Percent) ));
result.rgbtblue := ClampByte(round( ((AColor.rgbtblue/100) *pct) + ((BColor.rgbtBlue/100) *Percent) ));
end;
Begin
//Boucle maximum sur les plus petites Largeur/Hauteur
MaxX := Min(BmpText.Width, BmpFond.Width);
MaxY := Min(BmpText.Height, BmpFond.Height);
DoDrawTheText;
//BmpOut.SetSize(400,128);
for y := 0 to MaxY-1 do
begin // parcourir les lignes une par une
CT := pRGBTripleArray(BmpText.RawImage.GetLineStart(y));
CF := pRGBTripleArray(BmpFond.RawImage.GetLineStart(y));
CR := pRGBTripleArray(BmpOut.RawImage.GetLineStart(y));
for x := 0 to MaxX-1 do
begin
if (((CT^[x].rgbtRed +CT^[x].rgbtGreen+CT^[x].rgbtBlue) div 3) < Seuil) then
CR^[X] := CF^[X]
else
CR^[x] := ColorMix(CF^[X], CT^[X],tbColorMix.Position);
end;
end;
pnlView.Canvas.Clear;
pnlView.Canvas.Draw(0,0,BmpText); // ------> Avec BmpOut le texte est toujours au milieu !!!!!!!!!
Application.ProcessMessages;
End; |
