| java.lang.Object | ||
| ↳ | com.carto.datasources.TileDataSource | |
| ↳ | com.carto.datasources.BitmapOverlayRasterTileDataSource | |
Class Overview
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.
Summary
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BitmapOverlayRasterTileDataSource(int minZoom, int maxZoom, Bitmap bitmap, Projection projection, MapPosVector mapPoses, ScreenPosVector bitmapPoses)
Constructs a new bitmap overlay data source.
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| synchronized void | delete() | ||||||||||
| MapBounds |
getDataExtent()
Returns the extent of the tiles in this data source.
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| TileData |
loadTile(MapTile mapTile)
Loads the specified tile.
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[Expand]
Inherited Methods | |||||||||||
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From class
com.carto.datasources.TileDataSource
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From class
java.lang.Object
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Public Constructors
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. |
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| 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. |
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Public Methods
public synchronized void delete ()
public 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.
Returns
- The extent of the data source.
public TileData loadTile (MapTile mapTile)
Loads the specified tile.
Note: the tile coordinate system used here is vertically flipped relative to layer tile coordinate system.
Parameters
| mapTile | The tile to load. |
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Returns
- The tile data. If the tile is not available, null may be returned.