Unity 3D游戏开发学习笔记（1） 井字棋

第一次用Unity 3D写游戏，做了个井字棋。

由于不熟悉onGUI()和C#，参考了师兄的笔记。

代码实际上很简单，逻辑也简单，主要是通过这个小游戏来熟悉一下Unity 3D的一些基本操作实现，比如OnGUI()的原理，实际上这里面的Button并不是点击触发的效果，而是每一帧都在发生改变，因此这里Button实际上是不断重叠制造的吧。（显然变深色了），我感觉这样的做法不太好，但暂时不知道怎么去更好实现，就先这样了。

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

public class TicTacToe: MonoBehaviour {
    int turn = ;
    int [,]state = new int[,];
    void Start () {
        Reset();
    }

    void Update () { }

    void OnGUI() {
        if (GUI.Button(new Rect(,,,), "Start Game")) {
            Reset();
        }
        int current = Check();
        if (current == ) GUI.Label(new Rect(,,,),"O wins!");
        if (current == ) GUI.Label(new Rect(,,,),"X wins!");
        if (current == ) GUI.Label(new Rect(,,,),"Tied!");
        for (int i = ; i < ; i++) {
            for (int j = ; j < ; j++) {
                if (state[i, j] == ) {
                    GUI.Button(new Rect(+*i,+*j,,), "O");
                } else if (state[i, j] == ) {
                    GUI.Button(new Rect(+*i,+*j,,), "X");
                } 
                if (GUI.Button(new Rect(+*i,+*j,,), "")) {
                    if (current == ) {
                        if (turn == ) state[i, j] = ;
                        if (turn == -) state[i, j] = ;
                        turn *= -;
                    }
                }
            }
        }
    }

    int Check() {
        for (int i = ; i < ; i++) {
            if (state[i, ] == state[i, ] && state[i, ] == state[i, ] && state[i, ] != ) {
                return state[i, ];
            }
        }

        for (int j = ; j < ; j++) {
            if (state[, j] == state[, j] && state[, j] == state[, j] && state[, j] != ) {
                return state[, j];
            }
        }

        if (state[, ] !=  && state[, ] == state[, ] && state[, ] == state[, ]) {
            return state[, ];
        }

        if (state[, ] !=  && state[, ] == state[, ] && state[, ] == state[, ]) {
            return state[, ];
        }

        for (int i = ; i < ; i++) {
            for (int j = ; j < ; j++) {
                if (state[i, j] == ) return ;
            }
        }

        return ;
    }

    void Reset() {
        turn = ;
        for (int i = ; i < ; i++) {
            for (int j = ; j < ; j++) {
                state[i, j] = ;
            }
        }
    }
}