Class WebMercator

java.lang.Object
com.codename1.maps.vector.WebMercator
public final class WebMercator extends Object

Spherical Web Mercator (EPSG:3857) helpers expressed in "world pixels" -- the slippy-map coordinate space where the whole world spans tileSize * 2^zoom pixels. All of the vector engine's panning and tile math is done in this space.

These are the standard OSM tiling formulas; kept here (rather than reusing the projected Mercator) so the renderer can work in fractional pixels at fractional zoom without round-tripping through the legacy Coord projection flag.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final int
    TILE_SIZE
    The canonical tile edge length in pixels.

  • Method Summary

    Modifier and Type
    Method
    Description
    static double
    latToWorldY(double lat, double zoom)
    Latitude in degrees to an absolute world-pixel y at zoom.
    static double
    lonToWorldX(double lon, double zoom)
    Longitude in degrees to an absolute world-pixel x at zoom.
    static double
    sinh(double x)
    Hyperbolic sine, absent from the minimal device Math.
    static double
    worldSize(double zoom)
    The world width/height in pixels at zoom (may be fractional).
    static double
    worldXToLon(double worldX, double zoom)
    World-pixel x at zoom back to longitude in degrees.
    static double
    worldYToLat(double worldY, double zoom)
    World-pixel y at zoom back to latitude in degrees.

    Methods inherited from class Object

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

  • Field Details

    • TILE_SIZE

      public static final int TILE_SIZE
      The canonical tile edge length in pixels.
      See Also:

  • Method Details

    • worldSize

      public static double worldSize(double zoom)
      The world width/height in pixels at zoom (may be fractional).

    • lonToWorldX

      public static double lonToWorldX(double lon, double zoom)
      Longitude in degrees to an absolute world-pixel x at zoom.

    • latToWorldY

      public static double latToWorldY(double lat, double zoom)
      Latitude in degrees to an absolute world-pixel y at zoom.

    • worldXToLon

      public static double worldXToLon(double worldX, double zoom)
      World-pixel x at zoom back to longitude in degrees.

    • worldYToLat

      public static double worldYToLat(double worldY, double zoom)
      World-pixel y at zoom back to latitude in degrees.

    • sinh

      public static double sinh(double x)
      Hyperbolic sine, absent from the minimal device Math.