游戏效果截图
我将这个游戏设置为通关模式，每关开始的时候玩家会被传送到屏幕的中央，然后在屏幕的边缘会有若干架敌机向玩家靠拢过来，将敌机全部消灭掉就能过关，但要被敌机碰到就算过关失败，然后重新开始这关。我将和关卡有关的数据和设置放在Stage.kt中。
import android.graphics.canvas
import com.bamboo.boxspacegame.AppGobal
import com.bamboo.boxspacegame.effect.EffectManager
import com.bamboo.boxspacegame.spirit.Enemy
import com.bamboo.boxspacegame.spirit.player
import com.bamboo.boxspacegame.utils.LogEx
import com.bamboo.boxspacegame.utils.MathUtils
import com.jeremyliao.liveeventbus.LiveEventBus
import kotlinx.coroutines.*
import kotlin.Random.Random
/**
* 游戏关卡
*/
class Stage {
private var enemyCount: Int = 0
private var enemyHp: Float = 10f
private val listEnemy = mutableListOf<Enemy>()
private var gameStatus = READY
/**
* 关卡状态
*/
companion object Status {
const val READY = 0 // 准备阶段
const val PLAYING = 1 // 进行中
const val MISSION_FAILED = 2 // 失败
const val MISSION_COMPLETED = 3 // 过关
}
fun actionMotion() {
// 遍历关卡中的全部敌方
listEnemy.filter { !it.free }.forEach {
it.move()
// 判断敌人是否和玩家碰撞
if (MathUtils.cross(it.getRect(), Player.getRect())) {
val center = AppGobal.unitSize / 2
EffectManager.obtainBomb().play(Player.x center, Player.y center) {
gameStatus = MISSION_FAILED
// 通过事件机制播放音效
LiveEventBus.get(AppGobal.EVENT_BOMB_SFX).post(true)
}
}
}
// 判断敌方是否全部消灭
if (listEnemy.count { it.free && it.HP <= 0 } == listEnemy.size) {
gameStatus = MISSION_COMPLETED
}
}
/**
* 设置玩家的登场点和关卡中的敌人总数及敌人的HP值
*/
@Synchronized
suspend fun setPlayerAndEnemy(enemyCount: Int, enemyHP: Float) {
this.enemyCount = enemyCount
this.enemyHp = enemyHP
// 设置玩家登场
Player.isShow = false
listEnemy.clear()
EffectManager.obtainFlash().play(Player.x, Player.y, true) {
Player.let {
// 设置玩家的位置
it.isShow = true
it.x = AppGobal.screenWidth / 2f
it.y = AppGobal.screenHeight / 2f
}
}
// 敌人登场
withContext(Dispatchers.IO) {
delay(2000) // 延时两秒后加载敌人
gameStatus = READY
repeat(enemyCount) {
initEnemy(enemyHP)
delay(500)
if (it == (enemyCount - 1)) gameStatus = PLAYING
}
}
}
/**
* 初始化敌人的位置和血量
*/
private fun initEnemy(HP: Float) {
var x = Random(System.currentTimeMillis()).nextInt(20) * AppGobal.unitSize
val stepY = AppGobal.screenHeight / AppGobal.unitSize.toInt()
var y = Random(System.currentTimeMillis()).nextInt(stepY) * AppGobal.unitSize
when (Random(System.currentTimeMillis()).nextInt(4)) {
0 -> y = AppGobal.unitSize
1 -> y = AppGobal.screenHeight - AppGobal.unitSize * 2
2 -> x = AppGobal.unitSize
3 -> x = AppGobal.screenWidth - AppGobal.unitSize * 2
}
// 判断敌人的出场点是否在地图的透视区
if (x <= AppGobal.unitSize) x = AppGobal.unitSize
if (x >= AppGobal.screenWidth - AppGobal.unitSize)
x = AppGobal.screenWidth - 1 - AppGobal.unitSize
if (y < AppGobal.unitSize) y = AppGobal.unitSize
if (y >= AppGobal.screenHeight - AppGobal.unitSize)
y = AppGobal.screenHeight - 1 - AppGobal.unitSize
// 播放入场动画
EffectManager.obtainFlash().play(x, y, true) {
// 设置敌人的位置并保存
val enemy = Enemy().apply {
this.x = x
this.y = y
this.HP = HP
this.free = false
this.angle = setAngleByCoord(Player.x, Player.y)
}
listEnemy.add(enemy)
}
}
fun drawAllEnemy(canvas: Canvas) {
listEnemy.filter { !it.free }.forEach { it.draw(canvas) }
}
fun getListEnemy() = listEnemy
fun getStatus() = gameStatus
fun reset() {
gameStatus = MISSION_FAILED
}
}
接着是生成一个关卡管理类，这个类的特点就是通过协程生成一个无限循环，在循环体内通过关卡的不同状态做出不同的处理。因为管理类不需要多次实例化，所以直接定义成单例模式。
import android.graphics.Canvas
import com.bamboo.boxspacegame.AppGobal
import com.bamboo.boxspacegame.effect.EffectManager
import com.bamboo.boxspacegame.spirit.BulletManager
import com.jeremyliao.liveeventbus.LiveEventBus
import kotlinx.coroutines.*
/**
* 关卡管理
*/
object StageManager {
private var stage: Stage? = null
private var currentStageNo = 1 // 当前的关卡数
private var enemyCount = 5 // 初始的敌人数量
private var enemyHP = 10f // 初始的敌人的HP量
var score = 0
fun init(scope: CoroutineScope) {
scope.launch(Dispatchers.IO) {
stage = Stage()
stage?.setPlayerAndEnemy(enemyCount, enemyHP)
while (true) {
if (AppGobal.pause) continue
when (stage?.getStatus()) {
Stage.READY -> {
LiveEventBus.get(AppGobal.EVENT_STAGE_NO).post(currentStageNo)
LiveEventBus.get(AppGobal.EVENT_SCORE).post(score)
}
Stage.PLAYING -> { // 关卡进行中
stage?.actionMotion()
}
Stage.MISSION_COMPLETED -> { // 通关成功
EffectManager.release()
BulletManager.release()
currentStageNo
enemyCount
enemyHP = 10f
stage?.setPlayerAndEnemy(enemyCount, enemyHP)
LiveEventBus.get(AppGobal.EVENT_STAGE_NO).post(currentStageNo)
LiveEventBus.get(AppGobal.EVENT_SCORE).post(score)
}
Stage.MISSION_FAILED -> { // 通关失败
EffectManager.release()
BulletManager.release()
stage?.setPlayerAndEnemy(enemyCount, enemyHP)
LiveEventBus.get(AppGobal.EVENT_STAGE_NO).post(currentStageNo)
LiveEventBus.get(AppGobal.EVENT_SCORE).post(score)
}
}
delay(50)
}
}
}
fun draw(canvas: Canvas) {
stage?.drawAllEnemy(canvas)
}
/**
* 重新开始游戏
*/
fun reset() {
currentStageNo = 1
enemyCount = 5
enemyHP = 10f
score = 0
stage?.reset()
}
fun getListEnemy() = stage?.getListEnemy()
}
下一篇我们就可以实现游戏的MainActivity.kt
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