Question

你好我试图绘制我的功能（具有特定颜色的几何体集合），但我收到此错误：这是一个问题与arraylist被铸造，但我不知道如何解决它 PLZ帮助我提前致谢

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: 
java.util.ArrayList无法强制转换为 com.vividsolutions.jts.geom.GeometryCollection at com.vividsolutions.jump.workbench.ui.plugin.specific.SearchPropertiesPlugin $ 3.actionPerformed（SearchPropertiesPlugin.java:205）在 javax.swing.AbstractButton.fireActionPerformed（AbstractButton.java:1995）在 javax.swing.AbstractButton中的$ Handler.actionPerformed（AbstractButton.java:2318）在 javax.swing.DefaultButtonModel.fireActionPerformed（DefaultButtonModel.java:387）在 javax.swing.DefaultButtonModel.setPressed（DefaultButtonModel.java:242）在 javax.swing.plaf.basic.BasicButtonListener.mouseReleased（BasicButtonListener.java:236）在java.awt.Component.processMouseEvent（Component.java:6297）at javax.swing.JComponent.processMouseEvent（JComponent.java:3275）at java.awt.Component.processEvent（Component.java:6062）at java.awt.Container.processEvent（Container.java:2039）at java.awt.Component.dispatchEventImpl（Component.java:4660）at java.awt.Container.dispatchEventImpl（Container.java:2097）at java.awt.Component.dispatchEvent（Component.java:4488）at java.awt.LightweightDispatcher.retargetMouseEvent（Container.java:4575）在 java.awt.LightweightDispatcher.processMouseEvent（Container.java:4236） at java.awt.LightweightDispatcher.dispatchEvent（Container.java:4166）在java.awt.Container.dispatchEventImpl（Container.java:2083）at java.awt.Window.dispatchEventImpl（Window.java:2489）at java.awt.Component.dispatchEvent（Component.java:4488）at java.awt.EventQueue.dispatchEventImpl（EventQueue.java:668）at at java.awt.EventQueue.access $ 400（EventQueue.java:81）at java.awt.EventQueue $ 2.run（EventQueue.java:627）at java.awt.EventQueue $ 2.run（EventQueue.java:625）at java.security.AccessController.doPrivileged（Native Method）at java.security.AccessControlContext $ 1.doIntersectionPrivilege（AccessControlContext.java:87）在 java.security.AccessControlContext $ 1.doIntersectionPrivilege（AccessControlContext.java:98）在java.awt.EventQueue $ 3.run（EventQueue.java:641）at java.awt.EventQueue $ 3.run（EventQueue.java:639）at java.security.AccessController.doPrivileged（Native Method）at java.security.AccessControlContext $ 1.doIntersectionPrivilege（AccessControlContext.java:87）在java.awt.EventQueue.dispatchEvent（EventQueue.java:638）at java.awt.EventDispatchThread.pumpOneEventForFilters（EventDispatchThread.java:269）在 java.awt.EventDispatchThread.pumpEventsForFilter（EventDispatchThread.java:184）在 java.awt.EventDispatchThread.pumpEventsForHierarchy（EventDispatchThread.java:174）在 java.awt.EventDispatchThread.pumpEvents（EventDispatchThread.java:169）在 java.awt.EventDispatchThread.pumpEvents（EventDispatchThread.java:161）在java.awt.EventDispatchThread.run（EventDispatchThread.java:122）

这是他得到例外的地方：

Viewport viewport = new Viewport(context.getLayerViewPanel());
Paint fillPaint = null;
Color color = Color.yellow;
Stroke stroke =new BasicStroke(5, BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
final Graphics2D graphics = (Graphics2D) context.getLayerViewPanel().getGraphics();

//在这一行：

paintGeometryCollection((GeometryCollection) selectedFeatures(),
                                        graphics, viewport, true,
                                        stroke,fillPaint, true,
                                        stroke, color);

这是其需要的其他方法：

public Collection selectedFeatures() {
    ArrayList selectedFeatures = new ArrayList();
    for(BasicFeature basicFeature : TitreList) {
    selectedFeatures.add(search().getGeometry());
    // search() is a BasicFeature
    }
    return selectedFeatures;
}   


    private static void paintGeometryCollection(GeometryCollection collection,
        Graphics2D g, Viewport viewport, boolean renderingFill,
        Stroke fillStroke, Paint fillPaint, boolean renderingLine,
        Stroke lineStroke, Color lineColor)
        throws NoninvertibleTransformException {
        //For GeometryCollections, render each element separately. Otherwise,
        //for example, if you pass in a GeometryCollection containing a ring and a
        // disk, you cannot render them as such: if you use Graphics.fill, you'll get
        //two disks, and if you use Graphics.draw, you'll get two rings. [Jon Aquino]
        for (int i = 0; i < collection.getNumGeometries(); i++) {
            paint(collection.getGeometryN(i), g, viewport, renderingFill,
                fillStroke, fillPaint, renderingLine, lineStroke, lineColor);
        }
    }


public static void paint(Geometry geometry, Graphics2D g,
        Viewport viewport, boolean renderingFill, Stroke fillStroke,
        Paint fillPaint, boolean renderingLine, Stroke lineStroke,
        Color lineColor) throws NoninvertibleTransformException {
        if (geometry instanceof GeometryCollection) {
            paintGeometryCollection((GeometryCollection) geometry, g, viewport,
                renderingFill, fillStroke, fillPaint, renderingLine,
                lineStroke, lineColor);

            return;
        }

        Shape shape = toShape(geometry, viewport);
        if (!(shape instanceof GeneralPath) && renderingFill) {
            g.setStroke(fillStroke);
            g.setPaint(fillPaint);
            g.fill(shape);
        }
        if (renderingLine) {
            g.setStroke(lineStroke);
            g.setColor(lineColor);
            g.draw(shape);
        }
    }

private static Shape toShape(Geometry geometry, Viewport viewport)
throws NoninvertibleTransformException {
//At high magnifications, Java rendering can be sped up by clipping
//the Geometry to only that portion visible inside the viewport.
//Hence the code below. [Jon Aquino]
Envelope bufferedEnvelope = EnvelopeUtil.bufferByFraction(viewport.getEnvelopeInModelCoordinates(),
        0.05);
Geometry actualGeometry = geometry;
Envelope geomEnv = actualGeometry.getEnvelopeInternal();
if (! bufferedEnvelope.contains(geomEnv)) {
  /**
   * MD - letting Java2D do more clipping actually seems to be slower!
   * So don't use following "optimization"
   */
  //if (isRatioLarge(bufferedEnvelope, geomEnv, 2)) {
    if (!((geometry instanceof LineString) || (geometry instanceof MultiLineString)))
        actualGeometry = clipGeometry(geometry, bufferedEnvelope);
    //System.out.println("cl");
  //}
}
return viewport.getJava2DConverter().toShape(actualGeometry);
   }

private static Geometry clipGeometry(Geometry geom, Envelope env)
{
  try {
      Geometry clipGeom = EnvelopeUtil.toGeometry(env)
                                   .intersection(geom);
      return clipGeom;
  } catch (Exception e) {
      //Can get a TopologyException if the Geometry is invalid. Eat it. [Jon Aquino]
      //Can get an AssertionFailedException (unable to assign hole to a shell)
      //at high magnifications. Eat it. [Jon Aquino]

      //Alvaro Zabala reports that we can get here with an
      //IllegalArgumentException (points must form a closed linestring)
      //for bad geometries. Eat it. [Jon Aquino]
  }
  return geom;
}

Answer 1

public Collection selectedFeatures()会返回Colecction，但您会将其投放到GeometryCollection。对我来说这就是问题。

第paintGeometryCollection((GeometryCollection) selectedFeatures(),行

画我的几何特征集合？

1 个答案: