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Date Posted: 10:07:10 03/16/02 Sat
Author: Mark Chamberws
Subject: Possible bug in 'DrawBox'

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;
Rect: TRect;
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);

It works for me ;-)

Mark Chambers

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