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...Convert RichEdit to Bitmap?
Autor: Sonic
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Tip Rating (12):  
     


{
  Sometimes you need to draw RichEdit control upon TImage canvas.
  Maybe to manipulate it like create transparent RichEdit control
  or other manipulate trick.  But you don't know how to convert
  RichEdit control into Bitmap.

  Here's the solution to convert RichEdit control into bitmap.
}

uses RichEdit;
// Sonic Delphi
// soulyx@yahoo.com


function RTFtoBitmap(myRTF: TRichEdit; GiveSpaceForBorder: Integer): TBitmap;

  // using myRTF parameter with your TRichEdit control name,
  // default name "RichEdit1".
  // For GiveSpaceForBorder parameter, sometimes you need to draw
  // the RichEdit control with rectangle colorfull border, so you need
  // to give space for it.
var
  
myRect: TRect;
  temp: TBitmap;
begin
  
temp := TBitmap.Create;

  myRect := myRTF.ClientRect;
  // if you are using PRF_NONCLIENT parameter in myRTF.perform command
  // using this statement
  // myRect := Rect(0,0,MyRTF.Width,MyRTF.Height);

  
temp.Width  := myRect.Right;
  temp.Height := myRect.Bottom;
  with temp.Canvas do
  begin
    
Lock;
    try
      
myRTF.Perform(WM_PRINT, Handle, PRF_CLIENT);
      //you can trying to change PRF_CLIENT with
      //PRF_CHILDREN or PRF_CLIENT or PRF_NONCLIENT or PRF_ERASEBKGND
      //or combine them. See what happen...
    
finally
      
Unlock
    end;
  end;
  Result := TBitmap.Create;
  Result := CreateEmptyBmp(clWhite,
    temp.Width + GiveSpaceForBorder * 2,
    temp.Height + GiveSpaceForBorder * 2);
  Result.Canvas.Lock;
  Result.Canvas.Draw(GiveSpaceForBorder, GiveSpaceForBorder, temp);
  Result.Canvas.Unlock;
  temp.Free;
end;


// Here's to put colorfull border
procedure MakeBorder(const bdr: TBitmap; BorderWidth: Integer; BorderColor: TColor);
begin
  with 
bdr.Canvas do
  begin
    
Brush.Style := bsClear;
    pen.Width := BorderWidth;
    pen.Color := BorderColor;
    rectangle(BorderWidth - 1, BorderWidth - 1, bdr.Width, bdr.Height);
  end;
end;


// Example how to using it
//
// var bmp : TBitmap;
// begin
//   bmp := RTFtoBitmap(RichEdit1,2);
//   MakeBorder(bmp,2,clBlue);
//   Image1.Canvas.Draw(5,5,bmp);
//   bmp.free;
// end;
//
//
// Hey, how to make it transparent ??
// Hmm.. think it by yourself.
// I can only giving you one starting solution.. hehe


 

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