Re: pan solution

Hi,
here's my two cents. I occasionally make use of the map overview layer,
but I find it annoying in that it is in a separate window and so is
often hidden by the regular map. I keep wanting to explore making it
a permanent part of the main window, by sticking it right on top of the
real map, say in the upper left corner. There may already by a way
to do this, but as I said, I haven't really done any digging on
this feature.

then panning around could be done by dragging the square in the
overview layer, without having to click and wait, click and wait
or zoom out, recenter, zoom in as I do now.

my two cents,
james

>From Peter.Pan@comsat.com, received Mon, Jun 18, 2001 at 05:39:27PM -0400:
> 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
> >

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