你好我想繪製我的特徵（具有特定顏色的幾何體集合），但我得到這個錯誤： 這是一個問題與arraylist被鑄造，但我不怎麼修復它 PLZ幫助我 謝謝推進繪製我的幾何特徵集合？
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException:java.util.ArrayList cannot be cast to com.vividsolutions.jts.geom.GeometryCollection at com.vividsolutions.jump.workbench.ui.plugin.specific.SearchPropertiesPlugin$3.actionPerformed(SearchPropertiesPlugin.java:205) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236) at 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) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4236) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166) at 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 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) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98) at 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) at java.awt.EventQueue.dispatchEvent(EventQueue.java:638) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
這裏的地方，他得到的異常：
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();
//在這一行：
paintGeometryCollection((GeometryCollection) selectedFeatures(),
graphics, viewport, true,
stroke,fillPaint, true,
stroke, color);
和這裏的，它需要其他方法：
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;
}
爲更好地幫助更快張貼[SSCCE（http://sscce.org/），短，可運行，編譯，使用JLayer（Java7）的畫，而不是JViewport的，否則必須覆蓋setScrollMode（JViewport.Xxx）並與自己的RepaintManager一起使用（確保這些方法不是在這裏發佈的代碼片斷） – mKorbel 2013-03-13 11:28:14
使用'Whatever.getGraphics（）';僅用於打印到'BufferedImage'，'File'，打印到'紙打印機'，這種方法創建內部快照，將在第一個事件 – mKorbel 2013-03-13 11:33:37
到期，無需發佈SSCCE，可短期，可運行，可編譯 – mKorbel 2013-03-13 11:34:04