Hi Stephane,
Thanks for the code, this is a cool addition. I'll incorporate it
into the code base.
- Don
On Feb 21, 2007, at 6:12 AM, Stéphane Wasserhardt wrote:
> Hello !
>
> Here is a very simple addition to AbstractMouseMode.
> It doesn't change anything in it's current state. You must set
> AbstractMouseMode.mouseWheelCenters to true if you want to activate
> the modification.
> When set to true, this only change the way AbstractMouseMode
> handles mouseWheelEvents : instead of simply zooming in, mouse
> wheel negative rotations also center the projection towards the
> mouse location.
>
> For instance, if the current projection is centered on location A,
> and the mouse pointer is on location B, if you zoom in using the
> mouse wheel, the projection's center will be moved towards location
> B (at a constant rate : WHEEL_CENTERING_PERCENTS percents of the
> distance between A and B).
>
> I think this simple feature can be usefull for most openMap
> applications. Any feedbacks are welcome :-)
>
> Stephane
>
>
> PS : Added code is below (complete modified file is attached) :
>
> /**
> * Set this value to <code>true</code> in order to have the
> mapBean centered on mouse position each time
> * the mouseWheel is used for zooming.<br>
> * TODO This should be part of "Environment" or another general
> configuration.
> */
> public static transient boolean mouseWheelCenters = false;
> /**
> * When <code>mouseWheelCenters</code> is set to <code>true</
> code>, this constant indicates how much
> * the projection's center is moved towards the mouse location
> in percent of the distance between the
> * current projection's center and the mouse location.
> */
> public static final transient int WHEEL_CENTERING_PERCENTS = 15;
> private static final transient float WHEEL_CENTERING_RATIO =
> WHEEL_CENTERING_PERCENTS / 100f;
>
> /**
> * Invoked from the MouseWheelListener interface.
> */
> public void mouseWheelMoved(MouseWheelEvent e) {
> int rot = e.getWheelRotation();
> if (e.getSource() instanceof MapBean) {
> MapBean mb = (MapBean) e.getSource();
> if (rot > 0) {
> // Positive, zoom out
> mb.zoom(new ZoomEvent(mb, ZoomEvent.RELATIVE, 1.1f));
> } else {
> // ADDITION - BEGIN
> // When zooming in, if mouseWheelCenters mode is
> set ...
> if (mouseWheelCenters) {
> // The projection's center is moved by
> WHEEL_CENTERING_PERCENTS percents of the distance
> // to the mouse's location.
> Projection projection = mb.getProjection();
>
> float centerX = projection.getWidth() / 2f;
> float centerY = projection.getHeight() / 2f;
> int newX = Math.round(centerX + (e.getX() -
> centerX) * WHEEL_CENTERING_RATIO);
> int newY = Math.round(centerY + (e.getY() -
> centerY) * WHEEL_CENTERING_RATIO);
>
> LatLonPoint llp = projection.inverse(newX, newY);
> mb.center(new CenterEvent(mb, llp.getLatitude
> (), llp.getLongitude()));
> }
> // ADDITION - END
>
> mb.zoom(new ZoomEvent(mb, ZoomEvent.RELATIVE, .9f));
> }
> }
> }
> <AbstractMouseMode.java>
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Don Dietrick, dietrick_at_bbn.com
BBN Technologies, Cambridge, MA
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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Received on Wed Feb 21 2007 - 20:56:32 EST