[Geotools-gt2-users] Fwd: Problems with the unsupported SWT module

[Jonas S. <jon...@go...>]

Yes, it does. I used
http://www.naturalearthdata.com/downloads/50m-cultural-vectors/.

Am Mi., 22. Apr. 2020 um 17:15 Uhr schrieb Ian Turton <ijt...@gm...>:

> Does your shapefile have a .prj file? It's worth testing with say the
> states.shp file from GeoServer or the Natural Earth datasets.
>
> Ian
>
> On Wed, 22 Apr 2020 at 16:05, Jonas Schrottenbaum via GeoTools-GT2-Users <
> geo...@li...> wrote:
>
>> Hello,
>>
>> i managed to get an e4 application with geotools 20.5 and also the swt
>> module on 20.5 to run. But i still get exceptions when adding shapefiles or
>> wms-layers to the map.
>> The next step will be an attempt to upgrade the swt module version by
>> version. Before that i would like to be able to display a shapefile layer
>> and a wms layer on the same mappane, without problems, as a proof of
>> concept.
>>
>> When adding a shapefile layer, i get the exception enclosed in
>> exception1.txt.
>>
>> When adding a wms layer i get the exception enclosed in exception2.txt.
>>
>> Part code:
>> @PostConstruct
>> public void postConstruct(Composite parent, IEclipseContext context) {
>>     handleImages();
>>     MapContent content = new MapContent();
>>     SashForm sashForm = new SashForm(parent, SWT.HORIZONTAL | SWT.NULL);
>>     Composite mainComposite = sashForm;
>>     MapLayerComposite mapLayerTable = new
>> MapLayerComposite(mainComposite, SWT.BORDER);
>>     mapPane = new SwtMapPane(mainComposite, SWT.BORDER |
>> SWT.NO_BACKGROUND);
>>     mapPane.setMapContent(content);
>>     mapLayerTable.setMapPane(mapPane);
>>     sashForm.setWeights(new int[] { 1, 3 });
>>
>> mapPane.setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_WHITE));
>>     StreamingRenderer renderer = new StreamingRenderer();
>>     mapPane.setRenderer(renderer);
>>     context.set(SwtMapPane.class, mapPane);
>> }
>>
>> Import shapefile code:
>> @Execute
>> public void execute(SwtMapPane mapPane) {
>>     Display display = Display.getCurrent();
>>     Shell shell = new Shell(display);
>>     File file = JFileDataStoreChooser.showOpenFile(new String[] { "*.shp"
>> }, shell);
>>     try {
>>         if (file != null && file.exists()) {
>>            MapContent mapContent = mapPane.getMapContent();
>>            FileDataStore store = FileDataStoreFinder.getDataStore(file);
>>            SimpleFeatureSource featureSource = store.getFeatureSource();
>>            Style style = Utils.createStyle(file, featureSource);
>>            Layer layer = new FeatureLayer(featureSource, style);
>>            //Add viewport line here
>>            mapContent.addLayer(layer);
>>            mapPane.redraw();
>>         }
>>     ...
>> }
>>
>> Import WMS code:
>> @Execute
>> public void execute(SwtMapPane mapPane) {
>>     WebMapServer wms = null;
>>     try {
>>         wms = new WebMapServer(new URL("
>> http://ows.mundialis.de/services/service?"));
>>     } catch ...
>>     }
>>     WMSCapabilities capabilities = wms.getCapabilities();
>>     MapContent mapContent = mapPane.getMapContent();
>>     WMSLayer layer = new WMSLayer(wms,
>> capabilities.getLayerList().get(1));
>>     //Add viewport line here
>>     mapContent.addLayer(displayLayer);
>>     mapPane.redraw();
>> }
>>
>> I noticed that the SwtMapPane::getDisplayArea method (which is called
>> here:  at org.geotools.swt.SwtMapPane.setCrs(SwtMapPane.java:428)) returns
>> a ReferencedEnvelope where the crs is null, because the viewport of the
>> mapcontent is still null.
>> So i thought i need to initialize it somewhere somehow, but this is not
>> shown in any tutorial i think. So maybe i'm just missing a simple line in
>> the part code?
>>
>> I found out that adding the line
>> mapContent.getViewport().setBounds(layer.getBounds()); in the shapefile/wms
>> code as indicated by the comments is a quick fix for the exception, but not
>> a solution because it just works for one layer.
>>
>> When only using shapefiles, as soon as a second one is added (from the
>> same example dataset so a assume same crs) the bounds of the first one are
>> overwritten by the second one and if they happen to be samller, the borders
>> of the first shapefile are not displayed correctly anymore.
>> And if i try to combine both, there are obviously major problems, because
>> of, i assume, different crs and so on.
>> When trying to display a wms layer on top of a shapefile layer, the wms
>> layer is stretched and as soon as i try to change anything, like visibility
>> i get an exception (enclosed in exception3.txt) and the layers won't render
>> again.
>> Same when trying to display a shapefile layer on top of a wmslayer, i
>> also get an exception (enclosed in exception4.txt). But those are expected,
>> as my "fix" only takes one layer into account.
>>
>> So the final question is: What am i missing to avoid those "sourceCRS
>> can't be null" exceptions and what do i have to do to correctly overlay
>> multiple different layers like shapefile and WMS?
>> And should i follow the developers guide when trying to update the swt
>> module and talk to the dev mailing list and get the contributers license
>> and so on?
>>
>> Best regards
>> Jones
>>
>>
>> _______________________________________________
>> GeoTools-GT2-Users mailing list
>> Geo...@li...
>> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
>>
>
>
> --
> Ian Turton
>