Re[2]: pan solution

Yvon,

The rubber band is really a nice idea. As I remember, many CAD software like
AutoCAD are using this trchniques.

Could you please give me some idea how to implement this design?
Is it difficult and time consuming for this implementation using openmap? Do we
need to change the source code of openamap?

Thanks,
Peter

____________________Reply Separator____________________
Subject: Re: pan solution
Author: "Yvon Perreault" <yvonp@home.com>
Date: 6/18/01 4:32 PM

While this may seem to you like a natural way to go, you need to understand
how map drawing takes place. The result of all the data layers and
buffering done by OpenMap will seriously impact the "live" feedback you may
wish to see as you are, as you say, "dragging" the map around. It is almost
always impratical to have such live dragging with complicated drawing
algorithms, especially map-based displays.

However, it may be useful to implement a tool which shows, using a
rubberband effect, the displacement of the point where the drag starts to
where the drag stops, and then perform a complete map drawing cycle. This I
have done myself in some products I've developed. Could the OpenMap team
consider such an option? They'll have to provide guidance...

Just my $0.02.

-- Yvon Perreault
    FGM Inc.

----- Original Message -----
From: <Peter.Pan@comsat.com>
To: <openmap-users@bbn.com>
Sent: Monday, June 18, 2001 3:37 PM
Subject: pan solution

> I think the pan solution in the openmap is not convenient. Could we
implement it
> like following, Let the mouse drag the map, the map moves as the movement
of the
> mouse. In a word, drag the map by mouse.
>
> I am thinking about implementing this feature, could you please give me
some
> idea which part of the codes should be modified so that I can have a quick
> start?
>
> Thanks,
> Peter
>
> --
> [To unsubscribe to this list send an email to "majdart@bbn.com"
> with the following text in the BODY of the message "unsubscribe
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Subject: Re: pan solution
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