Say about the SpatialIndexFeatureSource, I encountered another problem.
I create a empty SpatialIndexFeatureCollection for another layer, and will
add features later on but display first. It throw the following exception:
java.lang.NullPointerException
at com.vividsolutions.jts.geom.Envelope.init(Envelope.java:253)
at com.vividsolutions.jts.geom.Envelope.<init>(Envelope.java:186)
at
org.geotools.geometry.jts.ReferencedEnvelope.<init>(ReferencedEnvelope.java:248)
at
org.geotools.data.collection.SpatialIndexFeatureCollection.getBounds(SpatialIndexFeatureCollection.java:235)
at
org.geotools.data.collection.SpatialIndexFeatureSource.getBounds(SpatialIndexFeatureSource.java:89)
at org.geotools.map.FeatureLayer.getBounds(FeatureLayer.java:195)
at org.geotools.map.MapContent.getMaxBounds(MapContent.java:600)
at org.geotools.map.MapContent.getViewport(MapContent.java:665)
at
org.geotools.swing.AbstractMapPane.doSetMapContent(AbstractMapPane.java:539)
at org.geotools.swing.AbstractMapPane.<init>(AbstractMapPane.java:205)
at org.geotools.swing.JMapPane.<init>(JMapPane.java:77)
at org.geotools.swing.JMapPane.<init>(JMapPane.java:66)
at org.geotools.swing.JMapFrame.<init>(JMapFrame.java:196)
at edu.buaa.taxi.ui.MapMatcherUI.init(MapMatcherUI.java:240)
at edu.buaa.taxi.ui.MapMatcherUI.<init>(MapMatcherUI.java:128)
at edu.buaa.taxi.ui.MapMatcherUI.main(MapMatcherUI.java:158)
here is some main code:
MapContent map = new MapContent();
...
SimpleFeatureType locationType = builder.buildFeatureType();
SimpleFeatureCollection layer2FeatureCollection = new
SpatialIndexFeatureCollection(locationType);
Style style2 = styleFactory.createStyle();
...
Layer layer2 = new FeatureLayer(layer2FeatureCollection, style2);
map.layers().add(layer2);
JMapFrame mapFrame = new JMapFrame(map);
Why? If I use ListFeatureCollecition, there is no problem, but I think it
may reduce the performance. How to solve it?
On Tue, Feb 28, 2012 at 4:00 AM, Andrea Aime
<[email protected]>wrote:
> On Mon, Feb 27, 2012 at 4:36 PM, Zheng Xudong <[email protected]> wrote:
> > Hi all,
> >
> > I use GeoTools 8.0M4 to load a shapefile contains about 10,000+
> > geometries (each is a multiline). The code is just like the demo in
> > quickstart. But I found the rendering is a little slow, especially when I
> > zoom in/out or drag the map, and even sometimes the rendering couldn't
> > completed (leave some blank area). What can I do to optimize the
> > performance of rendering, or the demo is already the best solution?
> The CPU
> > of my PC is Core Duo E6550, the memory is 2G, and the graphics card
> is ATI
> > Radeon HD 2400.
>
> If you can manage to load all features in memory there is, among the
> samples,
> one that loads all geometries in a in memory spatial index.
> Look for SpatialIndexFeatureSource
>
> Cheers
> Andrea
>
>
> --
> -------------------------------------------------------
> Ing. Andrea Aime
> GeoSolutions S.A.S.
> Tech lead
>
> Via Poggio alle Viti 1187
> 55054 Massarosa (LU)
> Italy
>
> phone: +39 0584 962313
> fax: +39 0584 962313
> mob: +39 339 8844549
>
> http://www.geo-solutions.it
> http://geo-solutions.blogspot.com/
> http://www.youtube.com/user/GeoSolutionsIT
> http://www.linkedin.com/in/andreaaime
> http://twitter.com/geowolf
>
> -------------------------------------------------------
>
--
Zheng Xudong
State Key Laboratory of Software Development Environment
School of Computer Science and Engineer, BeiHang University
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