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使用Xamarin開發移動應用示例——數獨遊戲(三)添加回退和計時功能

2022-01-28 05:13:45 尋找無名的特質

項目代碼可以從Github下載:https://github.com/zhenl/ZL.Shudu 。代碼隨項目進度更新。

我們已經創建了可以運行數獨遊戲的基本界面,現在為遊戲增加一些功能,首先是計時功能,數獨作為一種智力遊戲,完成時間是重要的指標。還有就是回退功能,在很多情况下,遊戲過程中需要試錯,如果進入死局,需要能够回到上幾步,再試一個新的路徑,如果沒有這個功能,只能重新開始,降低遊戲的吸引力。

計時功能的實現比較簡單,只要在開始和完成時記錄時間,計算出時間差並顯示就可以了。回退功能可以使用堆棧完成,將每一操作步驟放入堆棧,從堆棧中彈出一條記錄,就是回退的一步。

首先增加兩個變量,記錄開始時間和回退過程:

        private DateTime dtBegin;
        private Stack<string> steps = new Stack<string>();

然後,在開始遊戲的時候,記錄開始時間,並將堆棧清零:

            steps.Clear();
            dtBegin = DateTime.Now;

            this.lbFinish.IsVisible = false;
            this.lbTime.IsVisible = false;
            this.lbMessage.IsVisible = false;

在輸入數字後,記錄下輸入的比特置和值,存入堆棧:


            if (!checkval(x, y, num))
            {
                return;
            }
            steps.Push(x + "," + y + "," + num);
            currentButton.Text = currentNumBtn.Text;

增加響應回退的事件:


        private void btn_Reset_Clicked(object sender, EventArgs e)
        {
            if (steps.Count > 0)
            {
                var laststep = steps.Pop();
               
                var arr = laststep.Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                int x = int.Parse(arr[0]), y = int.Parse(arr[1]), num = int.Parse(arr[2]);
                buttons[x, y].Text = "";
            }
        }

在完成的時候,顯示耗時時間:

            if (IsFinish())
            {
                lbFinish.IsVisible = true;
                lbTime.IsVisible = true;
                rowResult.Height = 40;
                var diff = (DateTime.Now.Ticks - dtBegin.Ticks) / 10000 / 1000 / 60;
                lbTime.Text = diff + "分鐘";
            }

還需要增加新遊戲的功能,目前只有一個遊戲,再多增加一些,現在只簡單實現這個功能,將一些遊戲保存在數組中,開始遊戲時隨機抽取一個。代碼如下:

        private static int[,,] chesses =  {
           {
            {5,3,0,0,7,0,0,0,0},
            {6,0,0,1,9,5,0,0,0},
            {0,9,8,0,0,0,0,6,0},
            {8,0,0,0,6,0,0,0,3},
            {4,0,0,8,0,3,0,0,1},
            {7,0,0,0,2,0,0,0,6},
            {0,6,0,0,0,0,2,8,0},
            {0,0,0,4,1,9,0,0,5},
            {0,0,0,0,8,0,0,7,9}
            },
            {
            {3,0,2,4,0,7,9,0,1},
            {0,0,7,1,3,8,5,0,0},
            {6,0,0,0,0,0,0,0,4},
            {0,0,0,0,4,0,0,0,0},
            {0,9,4,0,0,0,1,5,0},
            {0,0,0,0,9,0,0,0,0},
            {4,0,0,0,0,0,0,0,5},
            {0,0,8,9,1,5,6,0,0},
            {5,0,9,6,0,4,7,0,2}
        },{
            {0,8,0,9,0,7,0,1,0},
            {9,0,0,3,8,6,0,0,5},
            {0,0,2,0,4,0,6,0,0},
            {5,9,0,0,0,0,0,2,6},
            {0,2,3,0,0,0,7,9,0},
            {7,4,0,0,0,0,0,5,1},
            {0,0,9,0,7,0,5,0,0},
            {4,0,0,8,5,9,0,0,2},
            {0,5,0,4,0,2,0,3,0}
        },{
            {4,0,8,0,0,0,0,0,5},
            {0,0,9,0,0,4,0,7,0},
            {3,1,0,2,0,0,8,0,0},
            {0,0,5,7,0,0,0,8,0},
            {0,0,0,0,9,0,0,0,0},
            {0,2,0,0,0,3,5,0,0},
            {0,0,2,0,0,9,0,1,4},
            {0,3,0,6,0,0,9,0,0},
            {1,0,0,0,0,0,7,0,6}
        },{
            {0,3,5,0,0,7,0,6,0},
            {8,0,6,0,1,0,0,0,7},
            {0,0,0,0,9,6,0,1,5},
            {4,0,1,8,0,3,0,0,0},
            {0,2,3,0,0,0,6,4,0},
            {0,0,0,6,0,2,3,0,1},
            {3,8,0,7,2,0,0,0,0},
            {6,0,0,0,3,0,7,0,9},
            {0,7,0,9,0,0,4,8,0}
        },{
            {0,0,0,7,0,4,0,0,0},
            {0,0,0,8,0,5,0,0,0},
            {5,8,0,0,0,0,0,4,7},
            {7,6,0,0,0,0,0,3,9},
            {9,2,0,6,1,3,0,7,8},
            {8,5,0,0,0,0,0,2,1},
            {1,7,0,0,0,0,0,9,3},
            {0,0,0,3,0,6,0,0,0},
            {0,0,0,1,0,7,0,0,0}
        },{
            {0,7,0,0,9,0,2,0,0},
            {0,0,0,0,0,7,0,0,5},
            {2,0,4,3,5,0,7,0,0},
            {0,5,0,0,4,0,9,0,0},
            {9,0,3,5,0,1,4,0,8},
            {0,0,7,0,6,0,0,1,0},
            {0,0,8,0,1,9,3,0,2},
            {7,0,0,2,0,0,0,0,0},
            {0,0,2,0,3,0,0,9,0}
        },{
            {3,0,2,4,0,7,9,0,1},
            {0,0,7,1,3,8,5,0,0},
            {6,0,0,0,0,0,0,0,4},
            {0,0,0,0,4,0,0,0,0},
            {0,9,4,0,0,0,1,5,0},
            {0,0,0,0,9,0,0,0,0},
            {4,0,0,0,0,0,0,0,5},
            {0,0,8,9,1,5,6,0,0},
            {5,0,9,6,0,4,7,0,2}
        }
        };

修改生成新遊戲的函數:

        private void SetNewGame()
        {
            int k;
            var lst = chesses;
            var leng = lst.GetLength(0);

            if (ra == null)
            {
                ra = new Random();
            }

            k = ra.Next(0, leng);
           
            var mychess = new int[9, 9];
            for (var i = 0; i < 9; i++)
                for (var j = 0; j < 9; j++)
                {
                    mychess[i, j] = chesses[k, i, j];
                }

            SetGame(mychess);
        }

好了,到這裏遊戲基本上已經初步完成了,項目代碼可以從Github下載:https://github.com/zhenl/ZL.Shudu 。代碼隨項目進度更新。
現在可以在手機上啟動一個新的遊戲試試了,當你玩了一會兒,忽然有個電話進來,接完電話,再回到遊戲,What?原來的進度都丟了!下一步我們需要在本地保存當前的進度。

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