Re: [OpenMap Users] navigating the map using the mouse

I have the following mouseDragged method in my PositionMouseMode (similar
to the normal NavMouseMode).
The map drag performance is quite reasonable even though I don't have a
particularly fast machine by today's standards.

    public void mouseDragged(MouseEvent e) {
///////////////////////////////////// mouseDragged event
                //
        if (Context.debugging("MouseModeMouseEvents")) debugMouseEvent(e);
        //
                //
        if ((e.getSource() instanceof MapBean) == false) // If not
from MapBean
            return; // Then return
                //
        MapFrame mapFrame = niApp.getMapFrame(); // Get the map
frame
        MapBean map = (MapBean)e.getSource(); // Get the map bean
        dragPoint = e.getPoint(); // Get mouse position
        dragPoint.x = Math.max(dragPoint.x, 0); // Don't allow -ve
        dragPoint.y = Math.max(dragPoint.y, 0); // Don't allow -ve
        dragPoint.x = Math.min(dragPoint.x, (map.getWidth() - 1)); //
Keep on the map
        dragPoint.y = Math.min(dragPoint.y, (map.getHeight() - 1)); //
Keep on the map
        mouseDragging = true; // Flag it is being dragged
                //
        // Now drag the map. //
        int xCentre = map.getWidth() / 2; // X middle
        int yCentre = map.getHeight() / 2; // Y middle
        int newX = xCentre + (mouseDownPoint.x - e.getX()); // Get new
X centre
        int newY = yCentre + (mouseDownPoint.y - e.getY()); // Get new
Y centre
        LatLonPoint newCentre = map.getProjection().inverse(newX, newY);
// Get as latlon
        map.setCenter(newCentre); // Shift the world
        mouseDownPoint.x = e.getX(); // Remember where it
        mouseDownPoint.y = e.getY(); // Came from
                //
        mapFrame.reportLocation(e); // Report position & scale
                //
        }
////////////////////////////////////////////////////////////////////////
End of mouseDragged()

regards,

Adrian

_____________________________________________

Dr. Adrian Lumsden
Product Specialist
Scientific Software and Systems Limited

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E-mail: Adrian.Lumsden@sss.co.nz

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Don Dietrick <dietrick@bbn.com>
Sent by: owner-openmap-users@bbn.com
26/02/04 02:54

 
        To: Lior Graf <liorg@mercury.co.il>
        cc: "'openmap-users@bbn.com'" <openmap-users@bbn.com>
        Subject: Re: [OpenMap Users] navigating the map using the mouse

Hi Lior,

I think I would modify the NavMouseMode to interpret the mouse events
as you like.

Getting the map to drag 'live' would be a little harder, you might have
to get involved with the BufferedMapBean/BufferedLayerMapBean image
buffer and translate it based on the mouse drag events. You would have
a handle to the MapBean as the source of the MouseEvent, so you don't
have to configure your mouse mode to look for it.

- Don

On Feb 25, 2004, at 5:12 AM, Lior Graf wrote:

> Hi,
>
>  
>
> I'd like to know whether it is possible to navigate the map using the
> mouse (clicking a point and then dragging the mouse to a certain
> direction, will cause the map to move to that direction).
>
>  
>
> Where do I start implementing that?
>
>  
>
> Regards,
>
>  
>
> Lior Graf
>
> Software Developer
>
> Mercury Interactive
>
>  
>
> Tel: 972 3 5399925
>
> Mobile: 972 66 507302
>
> Fax: 972 3 5331617
>
> Email: liorg@mercury.co.il
>
>  
>
>
> _______________________________________________________________________
> _
> This email has been scanned for all viruses.
>
> Mercury Interactive Corporation
> Optimizing Business Processes to Maximize Business Results
>

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