feat: add slime chunk helper command

src/main/kotlin/cn/rtast/fancybot/Const.kt

@@ -119,5 +119,5 @@ val commands = listOf(
     ReactionCommand(), MCSkinCommand(),
     GithubLatestCommitCommand(), RandomMusicCommand(),
     ZDJDCommand(), ScanQRCodeCommand(),
-    TTSCommand()
+    TTSCommand(), SlimeChunkHelperCommand()
 )

src/main/kotlin/cn/rtast/fancybot/commands/misc/SlimeChunkHelperCommand.kt

@@ -0,0 +1,127 @@
+/*
+ * Copyright © 2024 RTAkland
+ * Author: RTAkland
+ * Date: 2024/10/7
+ */
+
+
+package cn.rtast.fancybot.commands.misc
+
+import cn.rtast.fancybot.annotations.CommandDescription
+import cn.rtast.fancybot.util.str.encodeToBase64
+import cn.rtast.fancybot.util.toByteArray
+import cn.rtast.rob.entity.GroupMessage
+import cn.rtast.rob.util.BaseCommand
+import cn.rtast.rob.util.ob.MessageChain
+import cn.rtast.rob.util.ob.OneBotListener
+import java.awt.Color
+import java.awt.image.BufferedImage
+import java.util.*
+
+@CommandDescription("帮助你寻找指定空置域大小并且在某个区块范围内的最多史莱姆区块范围")
+class SlimeChunkHelperCommand : BaseCommand() {
+    override val commandNames = listOf("/slime")
+
+    private fun isSlimeChunk(worldSeed: Long, chunkX: Int, chunkZ: Int): Boolean {
+        val rng = Random(
+            worldSeed + (chunkX * chunkX) * 0x4C1906 +
+                    (chunkX * 0x5AC0DB) + (chunkZ * chunkZ) * 0x4307A7L +
+                    (chunkZ * 0x5F24F) xor 0x3AD8025FL
+        )
+        return rng.nextInt(10) == 0
+    }
+
+    private fun countSlimeChunksInRegion(xStart: Int, zStart: Int, chunkSize: Int, worldSeed: Long): Int {
+        var count = 0
+        for (x in xStart until xStart + chunkSize) {
+            for (z in zStart until zStart + chunkSize) {
+                if (isSlimeChunk(worldSeed, x, z)) {
+                    count++
+                }
+            }
+        }
+        return count
+    }
+
+    private fun findMaxSlimeChunks(
+        worldSeed: Long,
+        searchRange: Int,
+        chunkSize: Int
+    ): Pair<Pair<Pair<Int, Int>, Pair<Int, Int>>, Int> {
+        var maxCount = 0
+        var bestStartLocation = Pair(0, 0)
+        var bestEndLocation = Pair(0, 0)
+        for (x in -searchRange until searchRange - chunkSize + 1) {
+            for (z in -searchRange until searchRange - chunkSize + 1) {
+                val count = countSlimeChunksInRegion(x, z, chunkSize, worldSeed)
+                if (count > maxCount) {
+                    maxCount = count
+                    bestStartLocation = Pair(x, z)
+                    bestEndLocation = Pair(x + chunkSize - 1, z + chunkSize - 1)
+                }
+            }
+        }
+        return Pair(Pair(bestStartLocation, bestEndLocation), maxCount)
+    }
+
+    private fun generateSlimeChunkImage(startX: Int, startZ: Int, endX: Int, endZ: Int, worldSeed: Long): String {
+        val width = endX - startX + 1
+        val height = endZ - startZ + 1
+        val pixelSize = 15
+        val imageWidth = width * pixelSize
+        val imageHeight = height * pixelSize
+        val image = BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB)
+        val graphics = image.graphics
+        val borderColor = Color.LIGHT_GRAY
+        for (x in startX..endX) {
+            for (z in startZ..endZ) {
+                val isSlime = isSlimeChunk(worldSeed, x, z)
+                val fillColor = if (isSlime) Color.PINK else Color.WHITE
+                val px = (x - startX) * pixelSize
+                val pz = (z - startZ) * pixelSize
+                graphics.color = fillColor
+                graphics.fillRect(px, pz, pixelSize, pixelSize)
+                graphics.color = borderColor
+                graphics.drawRect(px, pz, pixelSize, pixelSize)
+            }
+        }
+        graphics.dispose()
+        return image.toByteArray().encodeToBase64()
+    }
+
+    override suspend fun executeGroup(listener: OneBotListener, message: GroupMessage, args: List<String>) {
+        if (args.isEmpty()) {
+            val msg = MessageChain.Builder()
+                .addText("此指令可以借助一个种子来帮助查找最适合史莱姆农场的位置")
+                .addNewLine()
+                .addText("如果不指定史莱姆农场的宽度的话默认为17x17区块大小")
+                .addNewLine()
+                .addText("不指定搜索区块范围默认为X: 500~-500, Y: 500~-500, 共计搜索100万个区块")
+                .addNewLine()
+                .addText("还可以指定空置域的大小, 不指定默认为17x17")
+                .addNewLine()
+                .addText("你可以使用`/slime <种子> [范围(例如600)] [空置域大小]`")
+                .build()
+            message.reply(msg)
+            return
+        }
+        val seed = args.first().toLong()
+        val slimeFarmSize = if (args.size == 1) 17 else args[1].toInt()
+        val range = if (args.size == 1) 500 else args[2].toInt()
+        val (location, slimeCount) = findMaxSlimeChunks(seed, range, slimeFarmSize)
+        val startX = location.first.first
+        val startZ = location.first.second
+        val endX = location.second.first
+        val endZ = location.second.second
+        val image = generateSlimeChunkImage(startX, startZ, endX, endZ, seed)
+        val msg = MessageChain.Builder()
+            .addText("起始区块坐标X:$startX Y:$startZ")
+            .addNewLine()
+            .addText("结束区块坐标X:$endX Y:$endZ")
+            .addNewLine()
+            .addText("共计史莱姆区块数量: $slimeCount")
+            .addImage(image, true)
+            .build()
+        message.reply(msg)
+    }
+}