I am not quite sure what you are stuck on. I guess that setting the
background to null asks the demo to draw it again?
--
Jody Garnett
On 2 March 2015 at 18:19, wbh <wangbaohua2...@163.com> wrote:
> Plus, after debug, my idea, that setting the background of the GPS is null
> after PAN or ZOOM, solves my problem.
> However, I feel this is not the best way.
> Can anybody tell me how to solve my problem?
>
>
>
>
> 在 2015-03-02 21:41:40，"wbh" <wangbaohua2...@163.com> 写道：
>
> Dears,
> I have a simple app which displays the vehicle's current position.
> -------------------my way------------------------
> 1 use socket to receive and send vehicle's position (Lon, Lat)
> 2 extend DirectLayer to GpsDirectLayer, which have an ArrayList to store
> all of the GPS point
> 3 when socket receives a GPS, add it to the ArrayList and call Draw()
> method of GpsDirectLayer. In this method, erase the previous point and draw
> the latest GPS. (Thanks Michael Bedward for the FlyingSaucer demo ^^)
> 4 In eras() method, get the background of the GPS (use Raster) before draw
> it
> -------------------my problem------------------
> If no PAN, ZOOM operation, all goes well. But when PAN and ZOOM, all
> layers are redrawn (I think). So the stored raster for the background is no
> longer available (or needed).
> What can I do to avoid this?
> My first idea is set the background is null when PAN or ZOOM is performed,
> is that the correct way?
> Thanks in advance!
>
>
>
>
>
>
>
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conversation now. http://goparallel.sourceforge.net/
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