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Date Posted: 06:44:14 05/30/03 Fri
Author: Michel
Subject: Re: ResizeTransform Question
In reply to: Kai 's message, "ResizeTransform Question" on 00:51:51 05/29/03 Thu


Hi Kai,

The image scroll box has to reset some information when the graphic has changed.

Call,

isb.Redraw(True)

instead of Invalidate.

Best regards,

Michel

>
>Hi All ~
>
>am new to Envision (even though we bought it two years
>ago):
>
>For the snippet below: isb is an ImageScrollBox (just
>dropped on form - no changes made but to its name) and
>Pic
>is a TPicture.
>
>Any suggestion as to why the code below does not
>produce the desired result, i.e. a stretchdrawn copy
>of the image from Pic on isb?
>
>
>
>
>//-----------------------------------------------------
>procedure Tform1.StretchDraw(SrcGraphic, DstGraphic:
>TDIBGraphic; const DstWidth, DstHeight: Integer);
>var
> StrDrawTransform: TResizeTransform;
>
>begin
> try
> // ifTriangle, ifHermite, ifBell, ifBSpline,
>ifLanczos3, ifMitchell
> StrDrawTransform :=
>TResizeTransform.Create;
> StrDrawTransform.Interpolated := True;
> StrDrawTransform.Filter := ifTriangle;
> StrDrawTransform.Height := DstHeight;
> StrDrawTransform.Width := DstWidth;
> //
> StrDrawTransform.ApplyOnDest( SrcGraphic,
>DstGraphic);
> finally
> StrDrawTransform.Free;
> end;
>end;
>
>//-----------------------------------------------------
>procedure TForm1.Button2Click(Sender: TObject);
>begin
> StretchDraw( Pic.Graphic as TDIBGraphic,
>isb.Graphic, isb.Width, isb.Height);
> isb.Invalidate;
>end;

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