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Re: [udig-devel] Shapefiles 

On 16-Mar-06, at 4:59 AM, M.S.Bachler wrote:


Hi!

I know can get the x,y which is great. Thanks.

I have had a first attempt at creating a shapefile and adding a new
layer connecting to the shape file, for the first time you drop a
specific icon on a map (subsequent times you add it to an existing layer 
- which is the next step).

I have pieced together code from various emails but still think I have
not really got a complete picture of what I am doing. The code I have,
creates a shape file (I can see the files are there), it also adds a
layer to the map (I can see the layer in the list), but it has an error 
- 'Connection to Resource Failed'.
I am also not sure if the Point code is right?

Here is my code: Any thoughts anyone about what I am doing wrong? (or
how I could simplify it?)

try {
	IndexedShapefileDataStoreFactory fac = new
IndexedShapefileDataStoreFactory();
	File file2 = new
File("Ecosensus"+EcosensusPlugin.sFS +"Shapefiles"+EcosensusPlugin.sFS+sF 
ileName+".shp");
	String sShapeFile = file2.getAbsolutePath();
	ShapefileDataStore ds = (ShapefileDataStore)
fac.createDataStore(new URL("file://"+sShapeFile));



	try {
		AttributeType geomAttr =
AttributeTypeFactory.newAttributeType("the_geom", Point.class);
		FeatureType featureType =
FeatureTypeBuilder.newFeatureType(new AttributeType[] {geomAttr},
"icon");
							
		GeometryFactory geomFactory = new GeometryFactory();
		Coordinate coord = new Coordinate(event.x, event.y);
		Point point = geomFactory.createPoint(coord);
		Feature theIcon = featureType.create(new Object[]
{point}, "myicon");							
					
		ds.createSchema( featureType );
								
		List<IService> services =
CatalogPlugin.getDefault().getServiceFactory().acquire(new
URL("file://"+sShapeFile));
		IService service = services.get(0);
							
		List resources = service.members(monitor);
		IGeoResource resource = (IGeoResource)resources.get(0);
I think the problem is here. the acquire method is tricky. It creates a service and georesource but does not necessarily add it to the catalog. Once you have the service make sure you add it to the catalog: 

CatalogPlugin.getDefault().getLocalCatalog().add(service);


		System.out.println("resource type =
"+resource.getClass().getName());
	

		Layer newLayer = factory.createLayer(resource);
		newLayer.setName(sFileName);
		map.sendCommandASync( (new AddLayerCommand(newLayer)) );
									
		DrawCommandFactory factory2 =
DrawCommandFactory.getInstance();
		DrawFeatureCommand cmd =
factory2.createDrawFeatureCommand(theIcon, crs);
		map.sendCommandASync(cmd);

									
	} catch (IllegalAttributeException e) {
		System.out.println("IllegalAttributeException");
		e.printStackTrace();
	} catch(SchemaException se) {
		System.out.println("SchemaException");
		se.printStackTrace();
	}

} catch (IOException e) {
	e.printStackTrace();
}

Michelle

-----Original Message-----
From: udig-devel-bounces@xxxxxxxxxxxxxxxxxxxxx
[mailto:udig-devel-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Jesse
Eichar
Sent: 14 March 2006 20:30
To: User-friendly Desktop Internet GIS
Subject: Re: [udig-devel] Shapefiles


Here's the interface (I added some comments today as well :P):

/**
*
* Defines the behaviour when a drag and drop event occurs.  The
extension declaration combined with the accepts method
* determines whether the Action will be ran for a given drag/drop event. 
*
* @author jdeolive
* @since 1.0.0
*/
public abstract class IDropAction {
	
	public static final String XPID =
"net.refractions.udig.ui.dropAction"; //$NON-NLS-1$
	
	/** the extension info **/
	IConfigurationElement element;
	
     private Object destination;

     private Object data;

     private DropTargetEvent event;

     private int location;
	
     /**
      * Returns the Configuration element that definates the action
in the extension declaration.
      *
      * @return the Configuration element that definates the action
in the extension declaration.
      */
	public IConfigurationElement getElement() {
		return element;
	}
	
     /**
      * Returns the name of the action.
      *
      * @return Returns the name of the action.
      */
	public String getName() {
		if (element == null)
			return ""; //$NON-NLS-1$
		return element.getAttribute("name"); //$NON-NLS-1$
	}
	
     /**
      * Called if the action seems to be a good candidate for
handling the drop event.
      *
* @return true if the action this it should handle the drop event. 
      */
     public abstract boolean accept();
	
     /**
      * Performs the drop action.
      *
      * @param monitor a progress monitor for showing the progress of
the current event.
      */
	public abstract void perform(IProgressMonitor monitor);

     /**
      * Returns the dropped data.
      *
      * @return the dropped data.
      */
     public Object getData() {
         return data;
     }

     /**
      * Returns the object that the data was dropped on.
      *
      * @return the object that the data was dropped on.
      */
     public Object getDestination() {
         return destination;
     }

     /**
      * Called by framework to initialize the action.
      *
      * @param element2 the extension configuration element
      * @param event2 the drop event.
      * @param destination2 the object that the data was dropped on.
      * @param data2 the data that was dropped.
      */
     public void init( IConfigurationElement element2,
DropTargetEvent event2, int location2,
             Object destination2, Object data2 ) {
         this.element=element2;
         this.event=event2;
         this.location=location2;
         this.destination=destination2;
         this.data=data2;
     }

     /**
      * The drop event.
      * @return Returns the drop event.
      */
     public DropTargetEvent getEvent() {
         return event;
     }

     /**
      * This does not always make sense for the drop event.  But in
the case that the component is a jface viewer then this method will
indicate the
      * location where the drop is taking place (before, on or after
the destination object).
      *
      * @see ViewerDropAdapter#getCurrentLocation()
      *
      * @return If the component is not a viewer this will always
return {@link ViewerDropAdapter#LOCATION_ON} otherwise it will be one
of the LOCATION_*
      * values.
      */
     public int getViewerLocation() {
         return location;
     }

}

Jesse


On 14-Mar-06, at 12:22 PM, M.S.Bachler wrote:


Hi!

That's great.
(I thought it was just me being really thick, and not spotting how to
get the x,y).

Thanks for adding these changes.

I still can't download the source code at the moment - we do use a
proxy
and I have a feeling it must be blocking some of the command
Subversion
needs - I will see IT tomorrow about it.

As I can't get to the source code - are there any javadocs on these
changes so I know what methods/variables are now available.

Thanks


Michelle

-----Original Message-----
From: udig-devel-bounces@xxxxxxxxxxxxxxxxxxxxx
[mailto:udig-devel-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Jesse
Eichar
Sent: 14 March 2006 19:08
To: User-friendly Desktop Internet GIS
Subject: Re: [udig-devel] Shapefiles


Ok so a change of plans.
I've changed the API slightly. Shouldn't bother you too much, all the 


information is still there in the IDropAction class, now I've added
the getEvent() method to the IDropAction class.  It has the x,y
location of the event.
I think I've cleaned things up a little so you shouldn't have to worry 


about any other classes besides the IDropAction (before the
UDIGDropHandler was accessible from the IDropAction)  I've changed
that but made sure that all the information is still available in the
IDropAction.


Jesse

On 14-Mar-06, at 9:33 AM, Jesse Eichar wrote:


Truthfully this is a good question.  I think you've identified
another short coming of this API.  I am going to make 3 changes to
UDIGDropHandler.

1.  I'm going to change getLocation to return a Point which will be
the x,y coordinates of the drop event relative to the component that
the component is dropped on. 2.  I'm going to add the method
getViewerLocation() that will return ON, BEFORE and AFTER locations.



(That is what getLocation() currently does)
3.  I'm going to add a method isViewer() so you can determine if
the control is a viewer and if you should use getViewerLocation()
or getLocation().

You'll have to download tonights nightly build.

(Sorry for the hard time you are having but DND has been a real
headache for me to figure out, never mind do right)

Jesse

On 14-Mar-06, at 2:19 AM, M.S.Bachler wrote:


Hi

Sorry about yesterdays rant.
If you have not lost all patients with me, I would really appreciate 


it if anyone could tell me how I get the x, y coordinates of the
drop from
my IDropAction class.

Thanks

Michelle

-----Original Message-----
From: udig-devel-bounces@xxxxxxxxxxxxxxxxxxxxx
[mailto:udig-devel-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of
M.S.Bachler
Sent: 13 March 2006 11:04
To: User-friendly Desktop Internet GIS
Subject: RE: [udig-devel] Shapefiles


Hi!

Thanks everyone for your various inputs.
I am still not sure what I am doing (I have decided I am just
thick!).
I can't see how the DataUtility way or creating a FeatureType passes 


in the x,y of the point. Then again, I can't even figure out how I
get the
x, y coordinates of the drop from my IDropAction class in order to
create the coords for my Point class in the first place? I have run
around the API, but can't figure it out.

Is there really no example code out there that I can study to
help me



understand things better. I am unable to download the source code
with Subversion (I did write to the list about this but no one
replied). I
need the equivalent of "uDig for Dummies" book.

Being a Java developer for many years I thought this project
would be



relatively easy. But I think having no familiarity with Eclipse or
GIS at all, has really not helped me. While Eclipse is becoming more 
familiar, 'GIS speak' is still a mistery. I think what seems
obvious to
many of you when talking about the code, just escapes me.
I know people are reluctant to spoon feed me the code I need. I know 


I need to go through the pain barrier and try and understand it
all myself. But it really hurts, and for various reasons the
timescale
of my project has been shrunk, and I am in danger (for the first
time in
my lief!), of not completing something, and having to say I can't
do it.

I think I have just not reached that eureka moment, when everything
suddenly clicks into place. I hope it happens soon! I still have a
head full of floating jigsaw pieces.

Meanwhile, if someone could help me with how I get the x,y of the
drop, that would be great.

Michelle - ( with a heavy cold - feeling rather sorry for myself :-
( - going to get a cup of tea )

-----Original Message-----
From: udig-devel-bounces@xxxxxxxxxxxxxxxxxxxxx
[mailto:udig-devel-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Jody
Garnett
Sent: 11 March 2006 08:58
To: User-friendly Desktop Internet GIS
Subject: Re: [udig-devel] Shapefiles
You guys are working to hard, I wrote a parser method I never wanted 


to do this stuff twice.
-
http://udig.refractions.net/docs/api-geotools/org/geotools/data/
DataUtil
ities.html

The format is silly, but it is in the javadocs:
- http://udig.refractions.net/docs/api-geotools/org/geotools/data/
DataUtil
ities.html#createType(java.lang.String,%20java.lang.String)

basically:
"name:String,age:Number,position:Point,*destination:Point"
Where the * indicates the default geometry ..

Other useful stuff:
- http://udig.refractions.net/docs/api-geotools/org/geotools/
feature/
Featu
reTypes.html

Jody



M.S.Bachler wrote:


Hi!

Silly question.

Earlier you helpfully gave me a code snippet to create a new
shapefile.

IndexedShapefileDatastoreFactory fac=new
IndexedShapefileDataStoreFactory();

ShapefileDataStore ds=fac.createDatastore(url);

// I assume this is the URL of the new shapefile I want it to
create?

GeometryFactory gf = new GeometryFactory();

ds.createSchema( featureType );

// Here I got lost. Started to investigate FeatureType and felt
like I was walking through tar.
I did some stuff with FeatureType the other day... trying to create 


a new Feature from scratch. Here is the code I found to create a
new
FeatureType:
                    AttributeType geomAttr =
AttributeTypeFactory.newAttributeType("the_geom", LineString.class); 
                    FeatureType ftRoad =

FeatureTypeBuilder.newFeatureType(new AttributeType[] {geomAttr},
"road");


    //                WKTReader wktReader = new WKTReader();
    //                Point geometry = (Point) wktReader.read
("POINT

(" + lat + " " + lon + ")");

                    GeometryFactory geomFactory = new

GeometryFactory();

                    LineString geometry =

geomFactory.createLineString(coords);

                    Feature theRoad = ftRoad.create(new Object[]
{geometry}, "myRoad");


This example Feature only has one attribute which is the geometry,
the_geom. You can create and add other attributes in the
AttributType[] and Object[] if needed.

These classes are from the org.geotools.feature package.

Hopefully you may find this useful. I'm not sure if this is the
most



up-to-date way of doing it, but it worked for me.

Mark

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http://udig.refractions.net
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_______________________________________________
User-friendly Desktop Internet GIS (uDig) http://
udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel
_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel
_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel


_______________________________________________
User-friendly Desktop Internet GIS (uDig) http:// udig.refractions.net 


http://lists.refractions.net/mailman/listinfo/udig-devel


_______________________________________________
User-friendly Desktop Internet GIS (uDig) http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel
_______________________________________________
User-friendly Desktop Internet GIS (uDig) http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel


_______________________________________________
User-friendly Desktop Internet GIS (uDig) http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel
_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel

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