Moving rectangle around StringGrid

From: Ray Hall (rayhall_at_bigpond.net.au)
Date: 03/28/05 

Date: Sun, 27 Mar 2005 23:56:25 GMT

Hello,

I am trying to move a rectangle around on a StringGrid. I can draw the
rectangle using FrameRect, but I end up with many rectangles as I move it.
This is some of the code I am using and a link to a video of what I want to
achive.

http://www.turbofast.com.au/bin/GhostBox.avi (240k)

with StringGrid1 do
  begin
     Cells[xCel, yCel]:= FloatToStr(air);
     Update;
     TheRect := Rect(L + x,T + y,R + x,B + y);
     Canvas.Brush.Color := clRed;
     Canvas.FrameRect(TheRect);
  end;

Thanks,

Ray Hall.

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