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Date Posted: 06:34:06 09/19/02 Thu
Author: Michel
Subject: Re: Automatic ZoomToSelection
In reply to: Ed Fessler 's message, "Automatic ZoomToSelection" on 10:40:45 09/18/02 Wed


Hi Ed,

The ZoomToSelection works in conjunction with the TRubberBandMouseHandler, not the quick select.

You can try the following code (taken from .ZoomToSelection)
in an OnQuickSelect event handler:

OldZoom := ZoomPercent;

XZoom := ZoomPercent * (Self.Width / (Rect.Right - Rect.Left + 1) * 1.0);
YZoom := ZoomPercent * (Self.Height / (Rect.Bottom - Rect.Top + 1) * 1.0);

{ limit the zoom value to 1000 % }
SetZoomPercent( MinFloat(MinFloat(XZoom,1000), YZoom) );

HorzScrollBar.Position := SafeTrunc(Rect.Left * (ZoomPercent / OldZoom));
VertScrollBar.Position := SafeTrunc(Rect.Top * (ZoomPercent / OldZoom));

I will also look at this in more detail.

Best regards,

Michel

>I want to make my program so that it zooms to the user
>selection as soon as they are done selecting (Unlike
>the demo where it is a 2 step process). I tried using
>the mmQuickSelect but I get an error message when I
>call ZoomToSelection that says "Rubberband mouse
>handler not active" I tried using mmSelect, but I am
>not sure where to put my ZoomToSelection call so that
>it will occur when the user is done selecting. If I
>need to use mmUser to do this an example would be
>helpful.
>
>Thanks in advance,
>Ed Fessler
>
>Ed Fessler

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