TOPIC:

How to draw on Cursor 5 years 2 months ago #11506

Roman
Topic Author
Offline
Junior Member
Posts: 56
Thank you received: 0

Hi All!
I need to runtime modify cursor image. Drawing by cursor Canvas do not work correctly: any painting make image transparent.
On the FPC-forum helped me with this code:

procedure TToolFill.UpdateImage;
var
  Cur : TCursorImage;
  Bitmap : PBitmapInfo;
  FillColor : TRGBQuad;

  procedure Square(x, y, w : integer);
  var
     I, J : Integer;
  begin
    // квадратик
    with FillColor do begin
       rgbRed := Red(fColor);
       rgbGreen := Green(fColor);
       rgbBlue := Blue(fColor);
       rgbReserved := $FF;
    end;
    for I := y to y+w do begin
      for J := x to x+w do begin
        Bitmap^.bmiColors[I * Cur.Width + J] := FillColor;
      end;
    end;
  end;

begin
  Cur := TCursorImage.Create;
  Cur.LoadFromResourceID(HINSTANCE, CurId);

  GetMem(Bitmap, SizeOf(TBitmapInfoHeader) + Cur.Width * Cur.Height * SizeOf(TColor));
  with Bitmap^.bmiHeader do begin
    biSize := SizeOf(TBitmapInfoHeader);
    biWidth := Cur.Width;
    biHeight := Cur.Height;
    biPlanes := 1;
    biBitCount := 32;
    biCompression := BI_RGB;
    biSizeImage := biWidth * biHeight * SizeOf(TColor);
  end;

  GetDIBits(Cur.Canvas.Handle, Cur.BitmapHandle, 0, Cur.Height, @(Bitmap^.bmiColors), Bitmap, DIB_RGB_COLORS);

  Square(Cur.Width - 9, Cur.Height - 9, 8);

  SetDIBits(Cur.Canvas.Handle, Cur.BitmapHandle, 0, Cur.Height, @(Bitmap^.bmiColors), Bitmap, DIB_RGB_COLORS);
  FreeMem(Bitmap);
  Screen.Cursors[CurId] := Cur.ReleaseHandle;
  Cur.Free;
  //
  WorkScreen.PB.Cursor := CurId;
end;

But this code not flexible becouse drawind curves, ellipses and angled lines need more work.

My question to the connoisseurs is this: is there any way to do the same thing on the principle of drawing on canvas?
For example, instead of the above procedure Square(..) use something like SomeObj.Canvas.FillRect (...)?

Please Log in or Create an account to join the conversation.

Last edit: by Roman.

How to draw on Cursor 5 years 2 months ago #11507

Sternas Stefanos
Offline
Moderator
Ex Pilot, M.Sc, Ph.D
Posts: 4461
Thank you received: 1082

Sir
TCursorImage has Canvas
so this must work

procedure test;
 var Cur : TCursorImage;
begin
  Cur := TCursorImage.Create;
  Cur.LoadFromResourceID(HINSTANCE, CurId);
  //................................

  cur.Canvas.FillRect(); 
  cur.Canvas.some
  ..
  ..

  //..............................
  Screen.Cursors[CurId] := Cur.ReleaseHandle;
  Cur.Free;
end;

PilotLogic Architect and Core Programmer

Please Log in or Create an account to join the conversation.

Last edit: by Sternas Stefanos.

How to draw on Cursor 5 years 2 months ago #11508

Roman
Topic Author
Offline
Junior Member
Posts: 56
Thank you received: 0

Sternas Stefanos wrote: so this must work

Must, but do not work

If cursor is 32-bit-color image any drawing as Canvas.LineTo or Canvas.FillRect or any other make original image transparent.

The image above is obtained by the following code (red circle is background):

Cur := TCursorImage.Create;
  Cur.LoadFromResourceID(HINSTANCE, CurId);
  with Cur.Canvas do begin
    Brush.Style := bsSolid;
    Brush.Color := clBlue;
    FillRect(10,10,21,21);
  end;
  Screen.Cursors[CurId] := Cur.ReleaseHandle;
  Cur.Free;

ScreenShot1.png

Please Log in or Create an account to join the conversation.

How to draw on Cursor 5 years 2 months ago #11509

Sternas Stefanos Offline Moderator Ex Pilot, M.Sc, Ph.D Posts: 4461 Thank you received: 1082	so the TCursorImage.Canvas work OK Try Cur.LoadFromResourceID(HINSTANCE, CurId); Cur.Transparent:=false or true; Cur.TransparentColor:= Cur.TransparentMode:= with Cur.Canvas do begin PilotLogic Architect and Core Programmer
	Please Log in or Create an account to join the conversation.

Forum

CodeTyphon Studio

CodeTyphon Studio Components and Libraries

Graphics Development

How to draw on Cursor

TOPIC:

How to draw on Cursor 5 years 2 months ago #11506

How to draw on Cursor 5 years 2 months ago #11507

How to draw on Cursor 5 years 2 months ago #11508

Attachments:

How to draw on Cursor 5 years 2 months ago #11509