Package org.gvsig.mvtrenderer.lib.impl

Class MVTStyles

java.lang.Object
org.gvsig.mvtrenderer.lib.impl.MVTStyles
public class MVTStyles extends Object
Manages Mapbox Vector Tile styles and their conversion to GeoTools styles.
Author:
fdiaz

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    org.geotools.mbstyle.MBStyle
    mbStyle
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    MVTStyles()
    Initializes a new instance of MVTStyles and creates the background polygon.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    download(URL url)
    Downloads the style JSON and parses it with MBStyleParser to verify correctness.
    Map<String,Set<String>>
    extractFieldsFromStyles()
    Extracts the field names used in the style layers for each source layer.
    List<MVTLayer>
    getLayersToDraw(Map<String,MVTTile.MVTDataSource> dataSources, org.locationtech.jts.geom.Envelope tileEnvelope, org.geotools.api.referencing.crs.CoordinateReferenceSystem tileCRS)
    Builds and returns the list of layers (MVTLayer) ready to be painted, in the correct order (Z-order) defined by the Mapbox style.
    org.geotools.api.style.Style
    getStyle(String styleLayerId)
    Calculates and caches the GeoTools Style associated with the indicated styleLayerId and returns it.
    Collection<String>
    getUsedFontNames()
    Returns the collection of font names used in the style.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • mbStyle

      public org.geotools.mbstyle.MBStyle mbStyle

  • Constructor Details

    • MVTStyles

      public MVTStyles()
      Initializes a new instance of MVTStyles and creates the background polygon.

  • Method Details

    • download

      public void download(URL url) throws IOException
      Downloads the style JSON and parses it with MBStyleParser to verify correctness. Stores the result in memory (MBStyle) for later use.
      Parameters:
      url - The style.json file URL.
      Throws:
      IOException - If there is a network or parsing error.

    • getLayersToDraw

      public List<MVTLayer> getLayersToDraw(Map<String,MVTTile.MVTDataSource> dataSources, org.locationtech.jts.geom.Envelope tileEnvelope, org.geotools.api.referencing.crs.CoordinateReferenceSystem tileCRS)
      Builds and returns the list of layers (MVTLayer) ready to be painted, in the correct order (Z-order) defined by the Mapbox style.
      Parameters:
      dataSources - Map of available data layers.
      tileEnvelope - The envelope of the tile.
      tileCRS - The coordinate reference system of the tile.
      Returns:
      Ordered list of MVTLayer objects.

    • getStyle

      public org.geotools.api.style.Style getStyle(String styleLayerId)
      Calculates and caches the GeoTools Style associated with the indicated styleLayerId and returns it.
      Parameters:
      styleLayerId - The style layer ID (Mapbox layer id).
      Returns:
      The GeoTools Style object ready for rendering, or null if the ID doesn't exist.

    • getUsedFontNames

      public Collection<String> getUsedFontNames()
      Returns the collection of font names used in the style.
      Returns:
      Collection of font names.

    • extractFieldsFromStyles

      public Map<String,Set<String>> extractFieldsFromStyles()
      Extracts the field names used in the style layers for each source layer.
      Returns:
      A map of source layer names to sets of field names.