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Date Posted: 09:31:34 03/09/01 Fri
Author: Bill Miller
Subject: Re: Continue.. Obtaining coordinates for cropping an Image
In reply to: Jason Offrey 's message, "Continue.. Obtaining coordinates for cropping an Image" on 01:40:16 03/08/01 Thu


Cropping is pretty easy with Envision once you get used to it. I have an Image Capture component I developed called Apprehend. It has demos with some of the Delphi image libaries including Envision. It also supports cropping. I'll sent it to you tonight....


>I have played with both the Image.Graphic and
>Image.DisplayedGraphic Height and Width values but
>both result in a cropped image which is either to
>large or to small; not an exact crop of the viewable
>screen image.
>I have included the Crop function I am currently
>trying to get working.
>Again, any help will be greatly appreciated.
>>Hi Jason,
>>Have you tried adding the Width and Height of the
>scroll >box to your upper left corner? The you could
>calculate the >crop transform coordinates
>>from the size of the DisplayedImage.Width/Height
>procedure TFormEditor.Crop;
> Transform : TCropTransform;
> Graphic : TDibGraphic;
> Left : LongInt;
> Top : LongInt;
> Right : LongInt;
> Bottom : LongInt;
> StartXPos,
> StartYPos,
> StopXPos,
> StopYPos : Longint;
> StartXPos:=Image.HorzScrollBar.Position;
> StartYPos:=Image.VertScrollBar.Position;
> StopXPos:=Round(
> StopYPos:=Round(
>(StartYPos+Image.DisplayedGraphic.Height) );
> Top:=Round(StartYPos+1);
> Left:=Round(StartXPos+1);
> Bottom:=Round(Image.Graphic.Height-StopYPos);
> Right:=Round(Image.Graphic.Width-StopXPos);
> Graphic := Image.Graphic;
> FUndoGraphic.Assign(Graphic);
> Transform := TCropTransform.Create;
> try
> Transform.Left := Left;
> Transform.Right := Right;
> Transform.Top := Top;
> Transform.Bottom := Bottom;
> Transform.ApplyOnDest(FUndoGraphic, Graphic);
> finally
> Transform.Free;
> end;
> Image.Redraw(True);

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