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45 lines
2.2 KiB
Markdown
45 lines
2.2 KiB
Markdown
# MapsforgeTiles
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Tile source libraries for loading map content from vector map files.
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The `MapsforgeTileSource` class in these libraries uses parts of the [Mapsforge](https://github.com/mapsforge/mapsforge)
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Java library, which is made accessible to .NET via [IKVM](https://github.com/ikvmnet/ikvm), a Java Virtual Machine for .NET.
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[Mapsforge](https://github.com/mapsforge/mapsforge) is published under a simplified variant of the
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[LGPL v3 license](https://www.gnu.org/licenses/lgpl-3.0).
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Map files can be downloaded from the [Mapsforge Download Server](https://download.mapsforge.org/).
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`MapsforgeTileSource` is initialized by a static `Initialize` method that takes the file path to either a single map file
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or a directory containing multiple map files, and a DPI scale factor that controls the size of the rendered map tiles.
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The `MapsforgeTileSource` instance constructor takes a string parameter that specifies a Mapsforge theme. This is either
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the full path of an XML `rendertheme` file, or the name of one of the built-in themes (ignoring case), e.g. `Default`.
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See [MapsforgeThemes.java](https://github.com/mapsforge/mapsforge/blob/master/mapsforge-themes/src/main/java/org/mapsforge/map/rendertheme/internal/MapsforgeThemes.java)
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for available theme names. The second and third optional constructor parameters specify the size of the tile source's
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internal tile cache and the relative scale of rendered text.
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Code sample:
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```
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MapControl.MapsforgeTiles.MapsforgeTileSource.Initialize(".\mapfiles", 1.5f);
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map.MapLayer = new MapTileLayer
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{
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TileSource = new MapControl.MapsforgeTiles.MapsforgeTileSource("Default")
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};
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```
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---
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While building with IKVM's `MavenReference` succeeds, running a `RenderThemeFuture`
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always fails with a `NoClassDefFoundError` exception for `org.xmlpull.v1.XmlPullParserFactory`.
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An alternative approach is to import Mapsforge classes by an `IkvmReference` that references a
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local JAR file with all required dependencies. This JAR is built from `pom.xml` in the MapsforgeTiles
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directory, by a custom PreBuild event in the project files which executes the command
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```
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mvn package
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```
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So in order to build the MapsforgeTiles libraries, a [Maven](https://maven.apache.org/)
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installation is required.
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