de.fhpotsdam.unfolding.tiles
Class MBTilesLoaderUtils

java.lang.Object
  de.fhpotsdam.unfolding.tiles.MBTilesLoaderUtils

public class MBTilesLoaderUtils
extends java.lang.Object

Loads map tile images from a MBTiles SQLite database. You need to provide the jdbcConnectionString to connect to the database file. e.g. "./data/my-map.mbtiles" This class is part of the Unfolding map library. See TileMill for Processing for more information.

Field Summary

static java.lang.String

SQLITE_JDBC_DRIVER

Constructor Summary

MBTilesLoaderUtils()

Method Summary

protected static processing.core.PImage	getAsImage(byte[] bytes) Converts the byte array into a PImage.
static processing.core.PImage	getMBTile(int column, int row, int zoomLevel, java.lang.String jdbcConnectionString) Loads the tile for given parameters as image.
protected static byte[]	getMBTileData(int column, int row, int zoomLevel, java.lang.String jdbcConnectionString) Loads the MBTile data from the database as blob, and returns it as byte array.

Methods inherited from class java.lang.Object

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

Field Detail

SQLITE_JDBC_DRIVER

public static final java.lang.String SQLITE_JDBC_DRIVER

See Also:

Constant Field Values

Constructor Detail

MBTilesLoaderUtils

public MBTilesLoaderUtils()

Method Detail

getMBTile

public static processing.core.PImage getMBTile(int column,
                                               int row,
                                               int zoomLevel,
                                               java.lang.String jdbcConnectionString)

Loads the tile for given parameters as image.

Parameters:

column - The column of the tile.

row - The row of the tile.

zoomLevel - The zoom level of the tile.

jdbcConnectionString - The path to the MBTiles database.

Returns:

The tile as PImage, or null if not found.

getMBTileData

protected static byte[] getMBTileData(int column,
                                      int row,
                                      int zoomLevel,
                                      java.lang.String jdbcConnectionString)
                               throws java.lang.Exception

Loads the MBTile data from the database as blob, and returns it as byte array.

Parameters:

column - The column of the tile.

row - The row of the tile.

zoomLevel - The zoom level of the tile.

Returns:

The tile as byte array with image information, or an empty array if not found.

Throws:

java.lang.Exception

getAsImage

protected static processing.core.PImage getAsImage(byte[] bytes)

Converts the byte array into a PImage. Expects the byte array to be in ARGB (RGB with alpha channel). Adapted from toxi

Parameters:

bytes - The image information as byte array.

Returns:

A PImage.