Lua实现U3D弹幕飞行游戏摘要

用Lua实现Unity弹幕飞行游戏要点记录：

- 对象池

创建游戏中可循环利用的游戏对象池

---获取一个可用子弹
---@return FlightGameBullet
function m:GetBullet()
    for i, v in pairs(self.flightGameBulletPool) do
        if not v.active then
            return v
        end
    end
    ---如果没有可用子弹，动态创建一个新的子弹
    local bulletCell = FlightGameBullet.New(UnityEngine.Object.Instantiate(self.BulletModel))
    self.flightGameBulletPool[bulletCell.View:GetInstanceID()] = bulletCell
    return bulletCell
end

---回收子弹
---@param bullet FlightGameBullet
function m:RecycleBullet(bullet)
    bullet.View.transform:SetParent(self.RecoveryNode.transform, false)
    bullet:Reset()
    self.flightGameBulletPool[bullet.View:GetInstanceID()] = bullet
end

---获取一个未被激活的敌人
---@return FlightGameEnemy
function m:GetEnemy()
    for i, v in pairs(self.flightGameEnemyPool) do
        if not v.active and v:IsPlayDamageEnd() then
            return v
        end
    end
    ---如果没有未被激活的敌人，动态创建一个新的敌人
    local enemy = FlightGameEnemy.New(UnityEngine.Object.Instantiate(self.EnemyModel),self.rootScene)
    self.flightGameEnemyPool[enemy.View:GetInstanceID()] = enemy
    return enemy
end

---回收敌人设置成未激活状态
---@param enemy FlightGameEnemy
function m:RecycleEnemy(enemy)
    enemy.View.transform:SetParent(self.RecoveryNode.transform, false)
    enemy:Reset()
    self.flightGameEnemyPool[enemy.View:GetInstanceID()] = enemy
end
--endregion Object Management

- 碰撞检测

实现场景中游戏对象的碰撞检测

--region Collision Detection
---检测敌人碰撞检测
---@param enemy FlightGameEnemy
function m:CheckCollisionEnemy(enemy)
    if enemy.active and enemy.born and enemy.blood > 0 and enemy.collider2D then
        ---和玩家发出的子弹碰撞
        for i, v in pairs(self.flightGameBulletPool) do
            if v.active then
                if v.bulletData.launcher == FlightGameConstant.ObjectType.FlightGame_Player then
                    local res = v.collider2D.bounds:Intersects(enemy.collider2D.bounds)
                    if res then
                        local hurt = v.bulletData.hurt
                        local addHurt = v.bulletData:AddHurtByMonsterType(enemy.enemyData:GetConfigData().Race)
                        hurt = math.floor(hurt * (1 + addHurt / 100))
                        enemy:ReduceBlood(hurt,v.bulletData.bulletPathID)
                        self:RecycleBullet(v)
                    end
                end
            end
        end

        ---和玩家碰撞
        if enemy.active and enemy.born and enemy.blood > 0 then
            local result = self.rootScene.gamePlayer:CheckPlayerBoundsIntersects(enemy.collider2D)
            if  result then
                local hurt = enemy.enemyData:GetChallengeEnemyAttr(FlightGameConstant.Attribute.Flight_Collision_Damage)
                self.rootScene.gamePlayer:ReduceBlood(hurt)
                enemy:ReduceBlood(hurt)
            end
        end
    end
end

---玩家碰撞检测
function m:CheckPlayerCollision()
    ---和敌人子弹碰撞
    for i, v in pairs(self.flightGameBulletPool) do
        if v.active then
            if v.bulletData.launcher == FlightGameConstant.ObjectType.FlightGame_Enemy then
                local res = self.rootScene.gamePlayer:CheckPlayerBoundsIntersects(v.collider2D)
                if res then
                    self.rootScene.gamePlayer:ReduceBlood(v.bulletData.hurt)
                    self:RecycleBullet(v)
                end
            end
        end
    end
    ---奖励箱拾取
    for i, v in pairs(self.flightGameRewardBoxCellPool) do
        if v.active and not v.picked then
            local res = self.rootScene.gamePlayer:CheckPlayerBoundsIntersects(v.collider2D)
            if res then
                local rewardBoxData = FlightGameRewardBoxData.New(v.rewardBoxData.specialCid,v.rewardBoxData.createTime)
                rewardBoxData:SetStartEffectTime(PlayerModule.GetServerTime())
                self.rootScene.gamePlayer:AddRewardBoxEffect(rewardBoxData)
                v:Pickup()
            end
        end
    end
end

---检测对象是否超出场景边界
---@return boolean
function m:CheckBeyondBoundaries(sceneElement)
    if sceneElement.View.transform.position.x < self.rootScene.LimitLeft.transform.position.x or
            sceneElement.View.transform.position.x > self.rootScene.LimitRight.transform.position.x or
            sceneElement.View.transform.position.y > self.rootScene.LimitUp.transform.position.y or
            sceneElement.View.transform.position.y < self.rootScene.LimitDown.transform.position.y then
        return true
    end
    return false
end
--endregion Collision Detection

- 子弹弹道实现

- 平行直线型

---不同攻击类型 双弹道直线
---@param num number 直线弹道数量
---@param bulletSpeed number 子弹移速
---@param cid number 弹道ID
function m:AttackDoubleLine(num,bulletSpeed,cid)
    local offset = 0
    local spacing = 0.6
    if num % 2 == 0 then
        offset = spacing / 2
    end
    for i = 0, num -1 do
        local pos = self.FirePos.transform.position
        local bulletCell = self.rootScene.gameManager:GetBullet()
        bulletCell.View.transform:SetParent(self.rootScene.RootNode.transform, false)
        if i == 0 then
            pos = Vector3.New(pos.x,pos.y + spacing * i - offset, pos.z)
        else
            if i%2 == 1 then
                pos = Vector3.New(pos.x,pos.y + spacing * math.ceil(i/2) - offset, pos.z)
            else
                pos = Vector3.New(pos.x,pos.y - spacing * math.ceil(i/2) - offset, pos.z)
            end
        end
        local bulletData = FlightGameBulletData.New(self.playerData.cid,self.hurt,FlightGameConstant.ObjectType.FlightGame_Player,Vector2.New(bulletSpeed,0),cid)
        bulletCell:SetData(pos,bulletData,function (bullet) self.rootScene.gameManager:RecycleBullet(bullet) end)
    end
end

- 扇形功击

---扇形功击
---@param num number 子弹数量
---@param angle number 间隔角度
---@param bulletSpeed number 子弹移速
---@param cid number 弹道ID
function m:AttackRange(num,angle,bulletSpeed,cid)
    local offset = 0
    if num % 2 == 0 then
        offset = angle / 2
    end
    for i = 0, num - 1 do
        local pos = self.FirePos.transform.position
        local bulletCell = self.rootScene.gameManager:GetBullet()
        bulletCell.View.transform:SetParent(self.rootScene.RootNode.transform, false)
        if i == 0 then
            bulletCell.View.transform:Rotate(0,0,angle * i - offset)
        else
            if i%2 == 1 then
                bulletCell.View.transform:Rotate(0,0,angle * math.ceil(i/2) - offset)
            else
                bulletCell.View.transform:Rotate(0,0,-angle * math.ceil(i/2) - offset)
            end
        end
        local bulletData = FlightGameBulletData.New(self.playerData.cid,self.hurt,FlightGameConstant.ObjectType.FlightGame_Player,Vector2.New(bulletSpeed,0),cid)
        bulletCell:SetData(Vector3.New(pos.x,pos.y,pos.z),bulletData,
                function (bullet) self.rootScene.gameManager:RecycleBullet(bullet) end)
    end
end