com.almasb.fxgl.entity.level.tiled.TMXLevelLoader.kt Maven / Gradle / Ivy
/*
* FXGL - JavaFX Game Library. The MIT License (MIT).
* Copyright (c) AlmasB ([email protected]).
* See LICENSE for details.
*/
package com.almasb.fxgl.entity.level.tiled
import com.almasb.fxgl.entity.Entity
import com.almasb.fxgl.entity.GameWorld
import com.almasb.fxgl.entity.SpawnData
import com.almasb.fxgl.entity.components.IDComponent
import com.almasb.fxgl.entity.level.Level
import com.almasb.fxgl.entity.level.LevelLoader
import com.almasb.fxgl.entity.level.LevelLoadingException
import com.almasb.fxgl.logging.Logger
import javafx.scene.paint.Color
import javafx.scene.shape.Polygon
import java.io.InputStream
import java.net.URL
import java.util.*
import java.util.zip.GZIPInputStream
import java.util.zip.InflaterInputStream
import javax.xml.namespace.QName
import javax.xml.stream.XMLInputFactory
import javax.xml.stream.events.StartElement
/**
* TMX Format version 1.1 reference: http://docs.mapeditor.org/en/latest/reference/tmx-map-format/
*
* @author Almas Baimagambetov ([email protected])
*/
private const val TILED_VERSION_LATEST = "1.2.3"
class TMXLevelLoader : LevelLoader {
private val log = Logger.get()
override fun load(url: URL, world: GameWorld): Level {
try {
val map = url.openStream().use { parse(it) }
log.debug("Parsed TiledMap: $url")
val tilesetLoader = TilesetLoader(map, url)
val tileLayerEntities = createTileLayerEntities(map, tilesetLoader)
val objectEntities = createObjectLayerEntities(map, tilesetLoader, world)
val level = Level(map.width * map.tilewidth, map.height * map.tileheight, tileLayerEntities + objectEntities)
map.properties.forEach { key, value ->
if (value is Float) {
level.properties.setValue(key, value.toDouble())
} else {
level.properties.setValue(key, value)
}
}
return level
} catch (e: Exception) {
log.warning("Parse error", e)
e.printStackTrace()
throw LevelLoadingException("${e.message}", e)
}
}
private fun createTileLayerEntities(map: TiledMap, tilesetLoader: TilesetLoader): List {
log.debug("Creating tile layer entities")
return map.layers.filter { it.type == "tilelayer" }
.map { layer ->
Entity().also {
it.type = "TiledMapLayer"
it.setProperty("layer", layer)
when (map.orientation) {
"orthogonal" -> {
it.viewComponent.addChild(tilesetLoader.loadView(layer.name))
}
"hexagonal" -> {
it.viewComponent.addChild(tilesetLoader.loadViewHex(layer.name))
}
else -> {
log.warning("Unknown map orientation: ${map.orientation}")
}
}
}
}
}
private fun createObjectLayerEntities(map: TiledMap, tilesetLoader: TilesetLoader, world: GameWorld): List {
log.debug("Creating object layer entities")
return map.layers.filter { it.type == "objectgroup" }
.flatMap { it.objects }
.map { tiledObject ->
val data = SpawnData(
tiledObject.x.toDouble(),
// it appears that if object has non-zero gid then its y is flipped
(tiledObject.y - if (tiledObject.gid == 0) 0 else tiledObject.height).toDouble()
)
// make data available when inside factory's spawn methods
data.run {
put("name", tiledObject.name)
put("type", tiledObject.type)
put("width", tiledObject.width)
put("height", tiledObject.height)
put("rotation", tiledObject.rotation)
put("id", tiledObject.id)
put("gid", tiledObject.gid)
// parse text data if present
tiledObject.textData?.let {
put("text", it.text)
put("color", it.color)
}
tiledObject.properties.forEach {
put(it.key, it.value)
}
}
// we populate the entity properties in case the factory didn't make use of them
world.create(tiledObject.type, data).also { e ->
data.data.forEach {
e.setProperty(it.key, it.value)
}
e.addComponent(IDComponent(tiledObject.name, tiledObject.id))
e.setPosition(data.x, data.y)
e.rotation = tiledObject.rotation.toDouble()
// non-zero gid means view is read from the tileset
if (tiledObject.gid != 0) {
e.viewComponent.addChild(tilesetLoader.loadView(tiledObject.gid, tiledObject.isFlippedHorizontal, tiledObject.isFlippedVertical))
}
}
}
}
fun parse(inputStream: InputStream): TiledMap {
val inputFactory = XMLInputFactory.newInstance()
val eventReader = inputFactory.createXMLEventReader(inputStream, "UTF-8")
val map = TiledMap()
val layers = arrayListOf()
val tilesets = arrayListOf()
// vars
var currentLayer = Layer()
var currentTileset = Tileset()
var currentTile = Tile()
var currentObject = TiledObject()
var insideTileTag = false
var mapPropertiesFinished = false
while (eventReader.hasNext()) {
val event = eventReader.nextEvent()
if (event.isStartElement) {
val start = event.asStartElement()
when (start.name.localPart) {
"map" -> { parseMap(map, start) }
"tileset" -> {
currentTileset = Tileset()
parseTileset(currentTileset, start)
}
"tile" -> {
currentTile = Tile()
parseTile(currentTile, start)
insideTileTag = true
}
"image" -> {
if (insideTileTag) {
parseImage(currentTile, start)
} else {
parseImage(currentTileset, start)
}
}
"layer" -> {
currentLayer = Layer()
parseTileLayer(currentLayer, start)
}
"data" -> {
parseData(currentLayer, eventReader.elementText, start)
}
"objectgroup" -> {
currentLayer = Layer()
parseObjectGroupLayer(currentLayer, start)
}
"object" -> {
// I'm making an assumption that map properties are defined before objects
// If there are no objects in the map this flag is irrelevant anyway
// as there can be no confusion between map and object properties
mapPropertiesFinished = true
currentObject = TiledObject()
parseObject(currentLayer, currentObject, start)
}
"property" -> {
if (mapPropertiesFinished) {
parseObjectProperty(currentObject, start)
} else {
parseMapProperty(map, start)
}
}
"text" -> {
parseTextProperty(currentObject, eventReader.elementText, start)
}
"polygon" -> {
parseObjectPolygon(currentObject, start)
}
}
}
if (event.isEndElement) {
val endElement = event.asEndElement()
when (endElement.name.localPart) {
"tileset" -> {
tilesets.add(currentTileset)
}
"tile" -> {
currentTileset.tiles.add(currentTile)
insideTileTag = false
}
"layer", "objectgroup" -> {
layers.add(currentLayer)
}
}
}
}
map.layers = layers
map.tilesets = tilesets
return map
}
private fun parseMap(map: TiledMap, start: StartElement) {
map.width = start.getInt("width")
map.height = start.getInt("height")
map.tilewidth = start.getInt("tilewidth")
map.tileheight = start.getInt("tileheight")
map.nextobjectid = start.getInt("nextobjectid")
map.type = "map"
map.version = 1
map.infinite = start.getInt("infinite") == 1
map.backgroundcolor = start.getString("backgroundcolor")
map.orientation = start.getString("orientation")
map.hexsidelength = start.getInt("hexsidelength")
map.staggeraxis = start.getString("staggeraxis")
map.staggerindex = start.getString("staggerindex")
map.renderorder = start.getString("renderorder")
map.tiledversion = start.getString("tiledversion")
if (map.tiledversion != TILED_VERSION_LATEST) {
log.warning("TiledMap generated from ${map.tiledversion}. Supported version: ${TILED_VERSION_LATEST}. Some features may not be parsed fully.")
}
}
private fun parseTileset(tileset: Tileset, start: StartElement) {
tileset.firstgid = start.getInt("firstgid")
tileset.name = start.getString("name")
tileset.tilewidth = start.getInt("tilewidth")
tileset.tileheight = start.getInt("tileheight")
tileset.margin = start.getInt("margin")
tileset.spacing = start.getInt("spacing")
tileset.tilecount = start.getInt("tilecount")
tileset.columns = start.getInt("columns")
}
private fun parseTile(tile: Tile, start: StartElement) {
tile.id = start.getInt("id")
}
/**
* Parse "image" tag inside "tileset" tag.
*/
private fun parseImage(tileset: Tileset, start: StartElement) {
tileset.image = start.getString("source")
tileset.imagewidth = start.getInt("width")
tileset.imageheight = start.getInt("height")
tileset.transparentcolor = start.getString("trans")
}
/**
* Parse "image" tag inside "tile" tag.
*/
private fun parseImage(tile: Tile, start: StartElement) {
tile.image = start.getString("source")
tile.imagewidth = start.getInt("width")
tile.imageheight = start.getInt("height")
tile.transparentcolor = start.getString("trans")
}
private fun parseTileLayer(layer: Layer, start: StartElement) {
layer.type = "tilelayer"
layer.name = start.getString("name")
layer.width = start.getInt("width")
layer.height = start.getInt("height")
layer.opacity = start.getFloat("opacity")
layer.visible = start.getInt("visible") == 1
}
private fun parseData(layer: Layer, data: String, start: StartElement) {
when (start.getString("encoding")) {
"csv" -> {
layer.data = data.replace("\n", "").split(",").map { it.trim().toLong() }
}
"base64" -> {
val bytes = Base64.getDecoder().decode(data.trim())
val inputStream = when (start.getString("compression")) {
"zlib" -> {
InflaterInputStream(bytes.inputStream())
}
"gzip" -> {
GZIPInputStream(bytes.inputStream())
}
else -> {
log.warning("Unsupported base64 compression: '" + start.getString("compression") + "'. " + layer.name + " may fail to render.")
InputStream.nullInputStream()
}
}
val longArray = arrayListOf()
// Read 4 bytes representing unsigned integer from '.tmx' data and convert to long
// Preserves 3 most significant bit from UInt which encodes flipped tile state
inputStream.use {
while (it.available() > 0) {
val rawInt = it.readNBytes(4)
val value: Long = (rawInt[0].toLong() and 0xFF shl 0) or
(rawInt[1].toLong() and 0xFF shl 8) or
(rawInt[2].toLong() and 0xFF shl 16) or
(rawInt[3].toLong() and 0xFF shl 24)
longArray.add(value)
}
}
layer.data = longArray
}
}
}
private fun parseObjectGroupLayer(layer: Layer, start: StartElement) {
layer.type = "objectgroup"
layer.name = start.getString("name")
}
private fun parseObject(layer: Layer, obj: TiledObject, start: StartElement) {
obj.name = start.getString("name")
obj.type = start.getString("type")
obj.id = start.getInt("id")
obj.x = start.getInt("x")
obj.y = start.getInt("y")
obj.rotation = start.getFloat("rotation")
obj.width = start.getInt("width")
obj.height = start.getInt("height")
// gid is stored as UInt, so parsing as int gives incorrect representation
val gidUInt = start.getUInt("gid")
// from https://doc.mapeditor.org/en/stable/reference/tmx-map-format/#tile-flipping
// Bit 32 (31th) is used for storing whether the tile is horizontally flipped,
// Bit 31 (30th) is used for the vertically flipped
val FLIPPED_HORIZONTALLY_FLAG = (1 shl 31).toUInt()
val FLIPPED_VERTICALLY_FLAG = (1 shl 30).toUInt()
val FLIPPED_DIAGONALLY_FLAG = (1 shl 29).toUInt()
obj.isFlippedHorizontal = gidUInt and FLIPPED_HORIZONTALLY_FLAG != 0.toUInt()
obj.isFlippedVertical = gidUInt and FLIPPED_VERTICALLY_FLAG != 0.toUInt()
// get rid of the metadata, leaving us with gid
val gid = (gidUInt and (FLIPPED_HORIZONTALLY_FLAG or FLIPPED_VERTICALLY_FLAG or FLIPPED_DIAGONALLY_FLAG).inv()).toInt()
obj.gid = gid
(layer.objects as MutableList).add(obj)
}
private fun parseObjectProperty(obj: TiledObject, start: StartElement) {
val propName = start.getString("name")
val propType = start.getString("type")
(obj.propertytypes as MutableMap)[propName] = propType
(obj.properties as MutableMap)[propName] = when (propType) {
"int" -> {
start.getInt("value")
}
"bool" -> {
start.getBoolean("value")
}
"float" -> {
start.getFloat("value")
}
"string", "" -> {
start.getString("value")
}
"color" -> {
start.getColor("value")
}
else -> {
throw IllegalArgumentException("Unknown property type: $propType for $propName")
}
}
}
private fun parseTextProperty(obj: TiledObject, data: String, start: StartElement) {
val textData = TextData()
textData.text = data
textData.color = start.getColor("color")
obj.textData = textData
}
private fun parseMapProperty(map: TiledMap, start: StartElement) {
val propName = start.getString("name")
val propType = start.getString("type")
(map.propertytypes as MutableMap)[propName] = propType
(map.properties as MutableMap)[propName] = when (propType) {
"int" -> {
start.getInt("value")
}
"bool" -> {
start.getBoolean("value")
}
"float" -> {
start.getFloat("value")
}
"string", "" -> {
start.getString("value")
}
"color" -> {
start.getColor("value")
}
else -> {
throw IllegalArgumentException("Unknown property type: $propType for $propName")
}
}
}
private fun parseObjectPolygon(obj: TiledObject, start: StartElement) {
val data = start.getString("points")
val points = data.split(" +".toRegex())
.flatMap { it.split(",") }
.map { it.toDouble() }
.toDoubleArray()
// https://github.com/AlmasB/FXGL/issues/575
val polygon = Polygon(*points)
(obj.properties as MutableMap)["polygon"] = polygon
}
}
// these retrieve the value if exists or return a default
private fun StartElement.getColor(attrName: String): Color {
val colorString = this.getString(attrName)
return if (colorString.isNotEmpty()) Color.web(colorString) else Color.BLACK
}
private fun StartElement.getBoolean(attrName: String): Boolean {
return this.getString(attrName).toBoolean()
}
private fun StartElement.getInt(attrName: String): Int {
return this.getString(attrName).toIntOrNull() ?: this.getFloat(attrName).toInt()
}
private fun StartElement.getFloat(attrName: String): Float {
return this.getString(attrName).toFloatOrNull() ?: 0.0f
}
private fun StartElement.getUInt(attrName: String): UInt {
return this.getString(attrName).toUIntOrNull() ?: 0.toUInt()
}
private fun StartElement.getString(attrName: String): String {
return this.getAttributeByName(QName(attrName))?.value.orEmpty()
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