如何编程实现在Geotools的JMapPane中显示MIF数据

如何编程实现在Geotools的JMapPane中显示MapInfo MIF格式的数据？ 我是新手，麻烦大侠们说详细些。首先谢谢各位了！！

<P>经过努力 终于可以读取并显示MapInfo MIF地图数据了，但是每次运行后点一下工具栏上的Reset（地球图标）工具才能将地图数据全部显示。问题出在mapArea上，不知道怎么才能得到合适的mapArea,如果哪位弄好了也发一下。</P>
<P>import java.awt.BorderLayout;<BR>import java.awt.Container;<BR>import java.util.HashMap;</P>
<P>import javax.swing.Action;<BR>import javax.swing.JFrame;<BR>import javax.swing.JToolBar;</P>
<P>import org.geotools.data.FeatureReader;<BR>import org.geotools.data.mif.MIFDataStoreFactory;<BR>import org.geotools.data.mif.MIFFile;<BR>import org.geotools.feature.Feature;<BR>import org.geotools.feature.FeatureCollection;<BR>import org.geotools.feature.FeatureCollections;<BR>import org.geotools.feature.FeatureType;<BR>import org.geotools.gui.swing.JMapPane;<BR>import org.geotools.gui.swing.PanAction;<BR>import org.geotools.gui.swing.ResetAction;<BR>import org.geotools.gui.swing.SelectAction;<BR>import org.geotools.gui.swing.ZoomInAction;<BR>import org.geotools.gui.swing.ZoomOutAction;<BR>import org.geotools.map.DefaultMapContext;<BR>import org.geotools.map.MapContext;<BR>import org.geotools.referencing.crs.DefaultGeographicCRS;<BR>import org.geotools.renderer.GTRenderer;<BR>import org.geotools.renderer.lite.StreamingRenderer;<BR>import org.geotools.styling.BasicLineStyle;<BR>import org.geotools.styling.Style;</P>
<P>import com.vividsolutions.jts.geom.Envelope;</P>
<P><BR>public class JMapPaneDemo extends JFrame {<BR> <BR> private static final long serialVersionUID = 1L;<BR> <BR> private JToolBar toolBar = new JToolBar();<BR> private JMapPane mapPane = new JMapPane();<BR> <BR> public JMapPaneDemo() {<BR>  Container contentPane = getContentPane();<BR>  contentPane.setLayout(new BorderLayout());<BR>  <BR>  contentPane.add(toolBar, BorderLayout.NORTH);  <BR>  contentPane.add(mapPane, BorderLayout.CENTER);<BR>  <BR>  Action zoomIn = new ZoomInAction(mapPane);<BR>  Action zoomOut = new ZoomOutAction(mapPane);<BR>  Action pan = new PanAction(mapPane);<BR>  Action select = new SelectAction(mapPane);<BR>  Action reset = new ResetAction(mapPane);<BR>  toolBar.add(zoomIn);<BR>  toolBar.add(zoomOut);<BR>  toolBar.add(pan);<BR>  toolBar.add(select);<BR>  toolBar.add(reset);<BR>  <BR>  setBounds(20, 20, 600, 400);<BR>  setVisible(true);<BR> }<BR> <BR> public void load(String mifFilePath)throws Exception {<BR>  MIFDataStoreFactory factory = new MIFDataStoreFactory();<BR>  HashMap params = new HashMap();<BR>  params.put(MIFDataStoreFactory.PARAM_FIELDCASE, "upper");<BR>  params.put(MIFDataStoreFactory.PARAM_GEOMNAME, "GEOM");<BR>  params.put(MIFDataStoreFactory.PARAM_GEOMTYPE, "typed");<BR>  MIFFile mf = new MIFFile(mifFilePath, params);<BR>  FeatureType ft = mf.getSchema();<BR>  FeatureReader featureReader = mf.getFeatureReader(); <BR>  <BR>  Envelope mapArea = null;<BR>  FeatureCollection collection = FeatureCollections.newCollection();<BR>  while (featureReader.hasNext()) {<BR>   Feature feature = featureReader.next();<BR>      collection.add(feature);<BR>      int count = 0;<BR>      if (count == 0) mapArea = feature.getBounds();<BR>      count++;<BR>  }<BR>  mapPane.setMapArea(mapArea);<BR>  featureReader.close();<BR>  <BR>  MapContext mapContext = new DefaultMapContext(DefaultGeographicCRS.WGS84);<BR>  Style style = new BasicLineStyle();<BR>  mapContext.addLayer(collection, style);<BR>  mapContext.getLayerBounds();<BR>  mapPane.setHighlightLayer(mapContext.getLayer(0));<BR>  <BR>  GTRenderer gtRenderer;<BR>  gtRenderer = new StreamingRenderer();<BR>  mapPane.setRenderer(gtRenderer);<BR>  mapPane.setContext(mapContext);<BR>  <BR>  repaint();<BR> }<BR> <BR> public static void main(String[] args) {<BR>  JMapPaneDemo application = new JMapPaneDemo();<BR>  application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);<BR>  <BR>  String mifFilePath = "yourfilename.mif";<BR>  try {<BR>   application.load(mifFilePath);<BR>  } catch (Exception e) {<BR>   e.printStackTrace();<BR>  }<BR> }<BR>}<BR></P>

你可以干脆设置一个固定大小，将所有的图都转换成这个大小