>From watching the sourcecode of JMapPane.java I know now, that mapArea is
null and mouseClicked doesn't check if it's a null-pointer, that's why I get
the NullPointerException. (maybe a check for null should be added here,
other methods do check I saw)
But shouldn't be my map rendered although I don't click in the MapPane?
Salke
Salke wrote:
>
> Hi Martin,
>
> thanks for your help. You were absolutly right, the gc.show()-method
> created the frame. But that actually means, that my JMapPane isn't working
> at all. The code now looks like that:
>
> MapContext mc = new DefaultMapContext();
> StyleBuilder sb = new StyleBuilder();
> org.geotools.styling.Style style =
> sb.createStyle(sb.createRasterSymbolizer());
>
> StreamingRenderer renderer = new StreamingRenderer();
>
> HashMap hints = new HashMap();
> hints.put("memoryPreloadingEnabled", Boolean.TRUE);
> renderer.setRendererHints(hints);
>
> mc.addLayer(gc, style);
> JMapPane mp = new JMapPane(new BorderLayout(), true, renderer, mc);
> mp.setBounds(230, 10, 600, 600);
> mp.setReset(true);
> mp.repaint();
>
> this.getContentPane().add(mp);
>
> Nothing appears on my frame, BUT, if I click on the area where the
> JMapPane SHOULD be, I get a NullPointerException, so obviously I'm still
> missing something. I think it's a problem with the MapContext or the
> Renderer, maybe some additional options need to be set?!
>
> Greetings and thanks for your help again, Salke
>
>
> Martin Schmitz-5 wrote:
>>
>> Hello Salke,
>>
>> I think your "strange" behavior comes from:
>>
>> gc.show();
>>
>> This (test method) opens a frame and shows the grid.
>> Comment this line out to avoid this.
>> To show your grid in "your own" JMapPane/MapContext it is additionally
>> necessary to invoke
>>
>> JMapPane.setReset(true);
>> JMapPane.repaint();
>>
>> after adding a new layer to the MapContext.
>>
>> @Geotools-Developers:
>> Maybe it is time to provide the JavaDoc for JMapPane, where also the
>> setReset(.) issue is mentioned. There often are the same questions on
>> this list...
>>
>> Kind regards
>>
>> Martin Schmitz
>>
>>
>> Salke schrieb:
>>> Hi,
>>>
>>> I started using geotools today, so I am pretty new to this impressive
>>> library. I am using a JMapPane to display raster data I got from a WMS
>>> (geoserver). The layer is displayed properly, BUT: As soon as I create
>>> the
>>> JMapPane-object, it's opening its own frame displaying the loaded layer
>>> inside. 0o Looking at the documentation I found out that JMapPane is a
>>> subclass of a "normal" JPanel, how can it open it's own frame? :X
>>>
>>> I want the JMapPane to be displayed inside my mainframe, which is a
>>> normal
>>> JFrame.
>>>
>>> Another question: How can I use the controls for Zooming and Panning I
>>> read
>>> about in some posts and parts of the documentation) At the moment, it
>>> looks
>>> like a static image beeing simply displayed. Some source is following,
>>> maybe
>>> it helps to find a way out of the magic frame-creation :)
>>>
>>> URL myURL = new
>>> URL("http://localhost:8080/geoserver/wms";);
>>> WebMapServer wms = new WebMapServer(myURL);
>>> GetMapRequest mapRequest = wms.createGetMapRequest();
>>> mapRequest.addLayer(currentLayer);
>>> mapRequest.setFormat("image/png");
>>> mapRequest.setDimensions(600, 600);
>>> mapRequest.setBBox(currentLayer.getLatLonBoundingBox());
>>>
>>> BufferedImage image =
>>> ImageIO.read(wms.issueRequest(mapRequest).getInputStream());
>>> GeneralEnvelope envelope = new
>>> GeneralEnvelope(currentLayer.getLatLonBoundingBox());
>>>
>>> GridCoverageFactory factory = new
>>> GridCoverageFactory();
>>> GridCoverage2D gc = factory.create("GridCoverage",
>>> image, envelope);
>>> gc.show();
>>>
>>> MapContext mc = new DefaultMapContext();
>>> StyleBuilder sb = new StyleBuilder();
>>> org.geotools.styling.Style style =
>>> sb.createStyle(sb.createRasterSymbolizer());
>>>
>>> StreamingRenderer renderer = new StreamingRenderer();
>>>
>>> HashMap hints = new HashMap();
>>> hints.put("memoryPreloadingEnabled", Boolean.TRUE);
>>> renderer.setRendererHints(hints);
>>>
>>> mc.addLayer(gc, style);
>>> JMapPane mp = new JMapPane(null, true, renderer, mc);
>>>
>>> // this points to this class that is a subclass of
>>> JFrame
>>> // the JMapPane is even "displayed" (own frame) without
>>> this line 0o
>>> this.getContentPane().add(mp);
>>
>>
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>
>
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