Hi,
That was exactly what i was trying to do, attempting to pass the return
value from the function createStyle method into the mapcontext. Sorry for
the confusion, it makes a little more sense now. What i did in my
ConstructMap.java code was created a style variable, and color c variable
and set that to equal to the return value of the createStyle function i.e
style = constrStyle.createStyle(myFeatureTypeName, c);
mapContext.addLayer(myFeatureSource,style);
i ran my app, and selected my .shp file, it never appeared, which i am
assuming it has to do with the function addLayer(). So what i did was in the
function,
public void addLayer(FeatureSource<SimpleFeatureType, SimpleFeature>
featureSource, Style style)
{
System.out.println("inside addlayer function");
}
i created a simple statement to ouput, just to check that the flow of
control does go here. Unfortunately, it does not and therefore does not show
the print statment. I know that the linestyle has been created and the type
names are being stored in the featureSource, but i dont know why it would
not be showing??
Here is my constructmap.java code
ConstructMap( ) throws Exception
{
this.constrStyle = new ConstructStyle();
this.c = null;
SwingFrame swingFr = new SwingFrame();
// Declare file instance
File file = new File("C:/Cavendish_map_data/map_01_data.shp");
// Declare ShapefileDataStore represents the file on disk
// Store file location in myShapeFile
DataStore myShapeFileStore = new
ShapefileDataStore(file.toURI().toURL());
myFeatureTypeNames = myShapeFileStore.getTypeNames();
myFeatureTypeName = myFeatureTypeNames[0];
//Create FeatureSource object which is about the information inside
the file itself(features)
FeatureSource<SimpleFeatureType, SimpleFeature> myFeatureSource;
myFeatureSource =
myShapeFileStore.getFeatureSource(myFeatureTypeName);
// Create FeatureType which will represent features as objects
// use getSchema to access myFeatureSource e.g roads
FeatureType myFeatureTypeSchema = myFeatureSource.getSchema();
// Create crs object to store geometry
CoordinateReferenceSystem myCrs =
myFeatureTypeSchema.getCoordinateReferenceSystem();
// Delcaire MapContext object to help build my map using crs
MapContext mapContext = new DefaultMapContext(myCrs);
// Pass file and feature schema referrence to myCreateStyle function
//constrStyle.myCreateStyle(file, myFeatureTypeSchema);
// Add featuresource and style to a layer
style = constrStyle.createStyle(myFeatureTypeName, c );
mapContext.addLayer(myFeatureSource, style);
// pass over the mapContext param to SwingFrame class to deal with
showing the map
swingFr.displayMap(mapContext);
setTitle(Title);
Again, your help would be much greatful, thanks.
Michael Bedward wrote:
>
> Hi Luong,
>
> I don't quite understand what you're trying to do, but passing an
> instance of your ConstructStyle class to the map context or whatever
> won't work because it is NOT a Style object. What you want to pass it
> is the return value of the createStyle method.
>
> If you want a separate style helper class you could have one with
> static methodsj. For example...
>
> public class ConstructStyle {
>
> public static Style constructLineStyle(String featureTypeName, Color
> c) {
> ...
> }
>
> // insert other style methods for polygons etc.
> }
>
> then in your map building code when you need a style for a feature type...
>
> Style style = ConstructStyle.constructLineStyle(myTypeName, myColour);
>
> Michael
>
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