Clickable on a theme that contains lines, rather than points in Java API

Question

Hi,
I am working on a Java thick client application using the MapViewer API.
The use case I am trying to implement is to click on a line that has been rendered by MapViewer, and identify the object that this lines represents.
I have been able to implement a click on a point (e.g. defined as MDSYS.SDO_GEOMETRY(2001,null,MDSYS.SDO_POINT_TYPE(3,3,null),null,null).
However, I am having difficulty with a line. I have tried with a line defined as follows:
MDSYS.SDO_GEOMETRY(2002, null, null,
MDSYS.SDO_ELEM_INFO_ARRAY(1,2,1),MDSYS.SDO_ORDINATE_ARRAY(3,3,4,4))
and also using the entry in the INTERSTATES table from the mvdemo sample database:
GEOM: MDSYS.SDO_GEOMETRY(2002,8307,null,MDSYS.SDO_ELEM_INFO_ARRAY(1,2,1),MDSYS.SDO_ORDINATE_ARRAY(-95.368599,29.77528,-95.366074,29.77133,-95.365822,29.771009,-95.365341,29.769661))
HIGHWAY: I 10/I 45
The approach I have taken is to use live features by making a JDBCTheme ("INTERSTATES_THEME") clickable.
The following is the code I used:
MapViewer map = new MapViewer("http://localhost:8888/mapviewer/omserver");
map.setServiceURL("http://localhost:8888/mapviewer/omserver");
map.setDataSourceName("mvdemo");
map.setImageFormat(MapViewer.FORMAT_PNG_URL);
map.addJDBCTheme(config.getDataSourceName(), "INTERSTATES_THEME",
"select HIGHWAY, geom from INTERSTATES where HIGHWAY = 'I 10/I 45'", "geom", "8307",
"L.DPH", null, null, true);
map.setFullExtent();
Then, I make a call to map.run(), map.getGeneratedMapImage() and render the generated image in a JPanel paintComponent method.
This all works fine, and I can see the highway being rendered.
However, if I add
map.setClickable(true, "INTERSTATES_THEME");
before the call to map.setFullExtent();
I get the following stack trace when map.run() is invoked:
java.lang.IllegalStateException: unread block data
     at java.io.ObjectInputStream$BlockDataInputStream.setBlockDataMode(ObjectInputStream.java:2377)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1361)
     at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1667)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1323)
     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
     at oracle.lbs.mapcommon.MapResponse.readObject(MapResponse.java:513)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
     at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
     at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
     at oracle.lbs.mapclient.MapViewer.processRawResponse(MapViewer.java:6706)
     at oracle.lbs.mapclient.MapViewer.run(MapViewer.java:6363)
Does anyone know if it is possible to make lines (rather than points) clickable on a thick client?
Any help is much appreciated.
Thanks.

Answer 1

Hi,
I want to have click event on Point.
I have written following code using Mapviewer API:
String serverUrl = "http://ps3962:7101/mapviewer/omserver";
mapClient = new MapViewer(serverUrl);
mapClient.setDataSourceName("mvdemo");
mapClient.setBaseMapName("demo_map");
mapClient.setCenterAndSize(-122.40, 37.80, 2.5);
mapClient.setDeviceSize(new java.awt.Dimension
(1280,768));
mapClient.setImageFormat(MapViewer.FORMAT_PNG_URL);
I have added point feature to it by mapClient.addPointFeature(cx, cy, 8307, "M.CIRCLE", "Point1",null,null);
After this I did mapClient.run()
and mapClient.getGeneratedImage()
The image returned is null.
I am able to get Image Url only.
And By using that URL if I rendered the image in jsf page, How can I make point feature clickable ?
In your first post You mentioned that you have used MapViewer.FORMAT_PNG_URL and still You are getting generatedImage.
Can you please tell me what can be the problem in my code?
I referred Mapviewer API and it is mentioned that for getting generatedMapImage the format should be FORMAT_RAW_COMPRESSED.
So could you please tell me how can you get Image by using FORMAT_PNG_URL ?
And also how to make point feature clickable ?
Its urgent. Your help will be greatly appreciated .
Thanks