/*
文件名:MapCamera.nut
路径:User/Object/Map/MapCamera.nut
创建日期:2024-12-22	21:56
文件用途:
*/
class MapCamera {
    //摄像机坐标
    X = 0;
    Y = 0;
    Z = 0;

    NextX = 0;

    //镜头可行坐标
    MovableAreaX = 0;
    MovableAreaY = 0;


    //背景偏移量
    BackgroundOffset = 0;
    //背景层移动速率
    BackgroundMoveSpeed = 1.0;
    //人物中线长度
    CharacterLineLength = 0;

    //地图对象
    MyMapParent = null;
    //跟随对象
    MyFromParent = null;
    //摄像机朝向
    Direction = 1;
    //摄像机朝向时间
    DirectionTime = 1;

    //缩放比率
    CameraRate = 1.0;

    constructor(gMap) {
        MyMapParent = gMap.weakref();
    }


    /*
     * @函数作用:设置跟随对象
     */
    function SetFromParent(FromParent) {
        MyFromParent = FromParent.weakref();
    }


    /*
     * @函数作用:
     */
    function SetPosition(gx, gy, gz) {
        X = gx * CameraRate;
        Y = gy * CameraRate;
        Z = gz * CameraRate;
    }

    /*
     * @函数作用: 增加坐标偏移
     */
    function AddPosition(Type, Value) {
        switch (Type) {
            case 0: //X
                X += Value;
                break;
            case 1: //Y
                Y += Value;
                break;
            case 2: //Z
                Z += Value;
                break;
        }
    }

    /*
     * @函数作用: 通过父对象同步自身坐标
     */
    function SyncPosByFromParent(MillisecondsDuration) {
        if (MyFromParent) {
            local R_X, R_Y, R_Z;

            // //X轴移动特殊判断
            // R_X = MyFromParent.X;
            // //为超出中线长度时摄像机不会改变位置
            // if (R_X <= (X + CharacterLineLength) && R_X >= (X - CharacterLineLength)) R_X = X;
            // //超出以后 补足位置
            // else if (R_X > (X + CharacterLineLength)) R_X = R_X - CharacterLineLength;
            // else if (R_X<(X - CharacterLineLength)) R_X = R_X + CharacterLineLength;


            //判断是否超出可行区域
            R_X = Math.Min(Math.Max(MyFromParent.X, 533), MovableAreaX - 533);
            R_Y = Math.Min(Math.Max(MyFromParent.Y, 300), MovableAreaY - 300);
            R_Z = MyFromParent.Z;

            SetPosition(R_X, R_Y, R_Z);
        }
    }

    /*
     * @函数作用:Update
     */
    function OnUpdate(Dt) {
        //同步自身与跟随对象的坐标
        SyncPosByFromParent(Dt);

        //刷新地图图层的坐标
        foreach(Name, Layer in MyMapParent.LayerObject) {
            //X屏幕宽度一般 Y屏幕宽度一半 +Z轴运算  在加统一120的偏移 在家background的偏移
            if (Name == "distantback") {
                Layer.SetPosition((-X + 533) * BackgroundMoveSpeed, -Y + Z + 300 + 120 + BackgroundOffset);
            } else {
                Layer.SetPosition((-X + 533), -Y + Z + 300 + 120 + BackgroundOffset);
            }
        }
    }


}