Mega Code Archive
Convert RichEdit to Bitmap
<![CDATA[
Title: Convert RichEdit to Bitmap?
{
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
]]>