Package com.massifmaps.datasources

Class BitmapOverlayRasterTileDataSource

java.lang.Object

com.massifmaps.datasources.TileDataSource

com.massifmaps.datasources.BitmapOverlayRasterTileDataSource

public class BitmapOverlayRasterTileDataSource
extends TileDataSource

Tile data source that uses given bitmap with two, three or four control points define a raster overlay.
Note: if two points are given, conformal transformation is calculated. If three points are given, affine transformation is calculated. In case of four points, perspective transformation is used.

Constructor Summary

Constructors

Constructor	Description
BitmapOverlayRasterTileDataSource(int minZoom, int maxZoom, Bitmap bitmap, Projection projection, MapPosVector mapPoses, ScreenPosVector bitmapPoses)	Constructs a new bitmap overlay data source.

Method Summary

Modifier and Type	Method	Description
MapBounds	getDataExtent()	Returns the extent of the tiles in this data source. The bounds are in coordinate system of the projection of the data source.
TileData	loadTile(MapTile mapTile)	Loads the specified tile. Note: the tile coordinate system used here is vertically flipped relative to layer tile coordinate system.

Methods inherited from class com.massifmaps.datasources.TileDataSource

buildTagValues, containsMetaDataKey, getContainerMetaData, getMaxOverzoomLevel, getMaxZoom, getMaxZoomWithOverzoom, getMetaData, getMetaDataElement, getMinZoom, getProjection, isMaxOverzoomLevelSet, notifyTilesChanged, setMaxOverzoomLevel, setMetaData, setMetaDataElement

Methods inherited from class java.lang.Object

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

Constructor Details

BitmapOverlayRasterTileDataSource

public BitmapOverlayRasterTileDataSource(int minZoom,
 int maxZoom,
 Bitmap bitmap,
 Projection projection,
 MapPosVector mapPoses,
 ScreenPosVector bitmapPoses)

Constructs a new bitmap overlay data source.

Parameters:

minZoom - The minimum zoom for generated tiles.

maxZoom - The maximum zoom for generated tiles.

bitmap - The bitmap to use as an overlay.

projection - The projection definining coordinate system of the control points.

mapPoses - The geographical control points. The list must contain either 2, 3 or 4 points.

bitmapPoses - The pixel coordinates in the bitmap corresponding to geographical control points. The number of coordinates must be equal to the number of control points in mapPoses list.

Throws:

IllegalArgumentException - If the transformation can not be calculated.

Method Details

getDataExtent

public MapBounds getDataExtent()

Description copied from class: TileDataSource

Returns the extent of the tiles in this data source.
The bounds are in coordinate system of the projection of the data source.

Overrides:

getDataExtent in class TileDataSource

Returns:

The extent of the data source.

loadTile

public TileData loadTile(MapTile mapTile)

Description copied from class: TileDataSource

Loads the specified tile.
Note: the tile coordinate system used here is vertically flipped relative to layer tile coordinate system.

Overrides:

loadTile in class TileDataSource

Parameters:

mapTile - The tile to load.

Returns:

The tile data. If the tile is not available, null may be returned.