yichael_smartbow/Assets/BowArrow/Scenes/GameChallenge/YejiHuntGameMode.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class YejiHuntGameMode : ChallengeGameMode
{
    //飞行平台的高度（距离Terrain地面的高度）
    float flyPlaneHeight;
    //关键树的记录器
    TreeAreaRecorder treeAreaRecorder;

    public YejiHuntGameMode(GameMgr gameMgr) : base(gameMgr) {
        this.animalTypeID = 1;
        animalPrefab = animalsBaseT.Find("Yeji").gameObject;
        this.flyPlaneHeight = gameMgr.transform.Find("FlyPlane").localPosition.y;
        treeAreaRecorder = gameMgr.transform.GetComponentInChildren<TreeAreaRecorder>().InitAndGet();
        //debug
        // SetLevel(1);
        // gameMgr.transform.Find("HunterGameView").gameObject.SetActive(true);
        AddSelectLevelView();
    }

    //表示能创建的最大动物数量
    public int createCountMax = 2;
    //动物创建索引值，目前用于记录生成到第几只动物
    int createAnimalIndex = 0;

    //设置关卡级别
    public override void SetLevel(int level) {
        createCountMax = level + 1;
        arrowCount = 5 + level * 3;
        time = 60 + (level - 1) * 10;
        animalCount = createCountMax;
        CreateAnimal();
    }

    //野鸡的基础飞行高度
    const float baseFlyHeightMin = 2;
    float baseFlyHeight = 1.5f;
    //野鸡将在哪棵树附近生成
    int createNearTreeIndex = 0;
    //能够在前几棵树徘徊
    int canFlyTreeCount = 4;

    void CreateAnimal() {
        if (createAnimalIndex >= createCountMax) return;

        //计算初始生成位置，后面的兔子生成越来越远，在标准方向的±30°内生成
        #region 
            if (createAnimalIndex < 2) {
                createNearTreeIndex = Random.Range(0, 2);
                canFlyTreeCount = 2;
            } else if (createAnimalIndex < 4) {
                createNearTreeIndex = Random.Range(1, 3);
                canFlyTreeCount = 3;
            } else {
                createNearTreeIndex = Random.Range(2, 4);
                canFlyTreeCount = 4;
            } 
            baseFlyHeight = baseFlyHeightMin + 0.5f *  createAnimalIndex;
            TreeAreaRecorder.AreaInfo areaInfo = treeAreaRecorder.getValidAreaInfo(createNearTreeIndex);
            Vector3 newPos = CalculateNewPosByTreePos(animalsBaseT, flyPlaneHeight, areaInfo);
        #endregion

        GameObject animalObject = GameObject.Instantiate(animalPrefab, newPos, Quaternion.identity, animalsBaseT);
        animalObject.SetActive(true);

        Yeji yeji = animalObject.GetComponent<Yeji>();
        yeji.canFlyTreeCount = canFlyTreeCount;
        yeji.treeAreaRecorder = treeAreaRecorder;
        yeji.flyPlaneHeight = flyPlaneHeight;
        yeji.SetFlyHeight(baseFlyHeight);
        yeji.RotateByWorldY(Random.value * 360);
        yeji.onDie += delegate(Yeji yeji) {
            animalCount--;
            animalSet.Remove(yeji);
            CreateAnimal();
        };
        animalSet.Add(yeji);
        createAnimalIndex++;

        if (animalSet.Count < maxAnimalCountAtTheSameTime) {
            CreateAnimal();    
        }
    }

    public static Vector3 CalculateNewPosByTreePos(Transform animalsBaseT, float flyPlaneHeight, TreeAreaRecorder.AreaInfo areaInfo) {
        Vector3 animalsBasePos = animalsBaseT.position;
        Vector3 treePos = areaInfo.transform.position;
        treePos.y = animalsBasePos.y;
        Vector3 vecAnimalsBaseToTree = treePos - animalsBasePos;
        float distanceH = vecAnimalsBaseToTree.magnitude;
        float newDistanceH = distanceH - areaInfo.radius - 1f;
        Vector3 displace = vecAnimalsBaseToTree.normalized * newDistanceH;
        displace.y += flyPlaneHeight;
        Vector3 newPos = animalsBaseT.position + displace;
        return newPos;
    }
}