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Date Posted: 19:21:52 03/18/02 Mon
Author: Michel
Subject: Re: Possible bug in 'DrawBox'
In reply to: Mark Chamberws 's message, "Possible bug in 'DrawBox'" on 10:07:10 03/16/02 Sat


Hi Mark,

Do you have version 1.1? The latest version is relatively simply, but maybe this has been change after the release. Here is the current version which looks similar, but does not use an intermediate TRect:

procedure TRubberbandMouseHandler.DrawBand;
begin
FCanvas.MoveTo(FX1-FImageScrollBox.HorzScrollBar.Position, FY1-FImageScrollBox.VertScrollBar.Position);

FCanvas.LineTo(FX2-FImageScrollBox.HorzScrollBar.Position, FY1-FImageScrollBox.VertScrollBar.Position);
FCanvas.LineTo(FX2-FImageScrollBox.HorzScrollBar.Position, FY2-FImageScrollBox.VertScrollBar.Position);
FCanvas.LineTo(FX1-FImageScrollBox.HorzScrollBar.Position, FY2-FImageScrollBox.VertScrollBar.Position);
FCanvas.LineTo(FX1-FImageScrollBox.HorzScrollBar.Position, FY1-FImageScrollBox.VertScrollBar.Position);

FBandVisible := True;
end;

Best regards,

Michel

>The TRubberBandMouseHandler.DrawRubberBand method
>doesn't take into account that the image may be
>scrolled. It also seems to do a bit of unnecessary
>mucking about with pens, etc. I think the method
>should be:
>
>
>procedure TRubberBandMouseHandler.DrawRubberBand;
>var
> Rect: TRect;
>begin
> Rect.Left := FLeft -
>FImageScrollBox.HorzScrollBar.Position;
> Rect.Top := FTop -
>FImageScrollBox.VertScrollBar.Position;
> Rect.Right := FRight -
>FImageScrollBox.HorzScrollBar.Position;
> Rect.Bottom := FBottom -
>FImageScrollBox.VertScrollBar.Position;
>
> FCanvas.MoveTo(Rect.Left, Rect.Top);
> FCanvas.LineTo(Rect.Right, Rect.Top);
> FCanvas.LineTo(Rect.Right, Rect.Bottom);
> FCanvas.LineTo(Rect.Left, Rect.Bottom);
> FCanvas.LineTo(Rect.Left, Rect.Top);
>end;
>
>It works for me ;-)
>
>Regards,
>Mark Chambers

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