Re: Controllable version of day/night layer

Hi Eric,

I just took a quick look at this, and added these methods to the
DayNightLayer. The doPrepare method was copied from another layer, and
calling that should kick off a DayNightWorker for you, and the layer
should update itself automatically.

I just tossed in a couple of setters and getters, just in case you need
those, too.

     /**
      * A method that will launch a DayNightWorker to fetch the images
      * that best suit the settings in the current attributes.
      *
      * If you call this AND change the projection of the MapBean, you
      * double the work for the layer.
      */
     public void doPrepare() {
        // If there isn't a worker thread working on a projection
        // changed or other doPrepare call, then create a thread that
        // will do the real work. If there is a thread working on
        // this, then set the cancelled flag in the layer.
        if (currentWorker == null) {
            currentWorker = new DayNightWorker();
            currentWorker.execute();
        }
        else setCancelled(true);
     }

     /**
      * Get the time of the overlay.
      */
     public long getOverlayTime() {
        return overlayTime;
     }

     /**
      * Set the time for the overlay.
      */
     public void setOverlayTime(long ot) {
        overlayTime = ot;
        currentTime = false;
     }

     /**
      * Returns whether the layer will set the overlayTime to the time
      * the image is created.
      */
     public boolean getCurrentTime() {
        return currentTime;
     }

     /**
      * Set whether the layer should set the overlayTime to the time
      * the image is created. If the time is being set to reflect a
      * time other than the current time, this needs to be set to
      * false. It actually is, if you manually set the overlay time.
      */
     public void setCurrentTime(boolean ct) {
        currentTime = ct;
     }

    /**
      * Get the timer being used for automatic updates. May be null if
      * a timer is not set.
      */
     public Timer getTimer() {
        return timer;
     }

     /**
      * If you want the layer to update itself at certain intervals,
      * you can set the timer to do that. Set it to null to disable it.
      */
     public void setTimer(Timer t) {
        timer = t;
     }

Hope this helps. If you send some GUI updates, I'll incorporate them to
the regular package!

Cheers,

Don

On Wednesday, August 8, 2001, at 05:11 PM, Jablow, Eric R. wrote:

>
> I'm trying to write a version of the DayNightLayer whose focus time can
> be
> changed under program control. Instead of either using a fixed time
> declared
> in the openmap.properties file or using the current time, updated on a
> timer, I want the user to be able to use a widget to select the time to
> display. Yet, I don't want to rewrite the layer.
>
> I've created a DateHandler bean to control the date for the entire
> system, a
> DatePopup GUI, and I've subclassed the DayNightLayer to listen for date
> changes. I put them together using the bean context, but I'm not sure
> what
> to do when the user chooses a new date. The subclass doesn't have
> access to
> currentWorker; the only thing I can figure to do is to set the overlay
> time
> and then to call actionPerformed with a null argument. It isn't working;
> nothing is redrawn.
>
> Can someone help? I'll provide source code if anyone is interested.
>
> Respectfully,
> Eric Jablow
>
> --
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>

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Donald F. Dietrick, dietrick@bbn.com
BBN Technologies, 10 Moulton Street, Cambridge, MA 02138
617.873.3031 FAX 2794
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