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Date Posted: 01:40:16 03/08/01 Thu
Author: Jason Offrey
Subject: Continue.. Obtaining coordinates for cropping an Image

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.

Jason


>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 >properties.
>

procedure TFormEditor.Crop;
var
Transform : TCropTransform;
Graphic : TDibGraphic;

Left : LongInt;
Top : LongInt;
Right : LongInt;
Bottom : LongInt;

StartXPos,
StartYPos,
StopXPos,
StopYPos : Longint;
begin
StartXPos:=Image.HorzScrollBar.Position;
StartYPos:=Image.VertScrollBar.Position;
StopXPos:=Round( (StartXPos+Image.DisplayedGraphic.Width));
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);
// Bottom:=Round(Image.DisplayedGraphic.Height-StopYPos);
// Right:=Round(Image.DisplayedGraphic.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);
end;

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