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The WorldWind Kotlin SDK (WWK) includes the library, examples and tutorials for building multiplatform 3D virtual globe applications for Android, Web and Java.

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package earth.worldwind.ogc

import earth.worldwind.geom.Sector
import earth.worldwind.render.image.ImageSource.Companion.fromUrlString
import earth.worldwind.render.image.ImageTile
import earth.worldwind.util.Level
import earth.worldwind.util.Logger
import earth.worldwind.util.Logger.logMessage
import earth.worldwind.util.TileFactory

open class WmtsTileFactory(
    private val template: String,
    private val tileMatrixIdentifiers: List,
    private val firstLevelHeight: Int,
    val imageFormat: String
): TileFactory {
    override val contentType = "WMTS 1.0.0"

    override fun createTile(sector: Sector, level: Level, row: Int, column: Int) = ImageTile(sector, level, row, column).apply {
        urlForTile(level.levelNumber, row, column)?.let { urlString ->
            // Assign resource post-processor to transform received resource and save it in cache if necessary
            imageSource = fromUrlString(urlString).also { it.postprocessor = this }
        }
    }

    fun urlForTile(level: Int, row: Int, column: Int): String? {
        if (level >= tileMatrixIdentifiers.size) {
            logMessage(
                Logger.WARN, "WmtsTileFactory", "urlForTile",
                "invalid level for tileMatrixIdentifiers: $level"
            )
            return null
        }

        // flip the row index
        val rowHeight = firstLevelHeight shl level
        val flipRow = rowHeight - row - 1
        return template.replace(TILE_MATRIX_TEMPLATE, tileMatrixIdentifiers[level])
            .replace(TILE_ROW_TEMPLATE, flipRow.toString()).replace(TILE_COL_TEMPLATE, column.toString())
    }

    companion object {
        const val TILE_MATRIX_TEMPLATE = "{TileMatrix}"
        const val TILE_ROW_TEMPLATE = "{TileRow}"
        const val TILE_COL_TEMPLATE = "{TileCol}"
    }
}