這是“使用 C# 開發智能手機軟件：推箱子”系列文章的第三篇。在這篇文章中，介紹 Common/Block.cs 源程序文件。
以下是引用片段：
1 namespace Skyiv.Ben.PushBox.Common
2 {
3 ///
4 /// 基本單元格: 地 槽 牆 磚 箱子 工人
5 ///
6 static class Block
7 {
8 public const byte Land = 0; // 地
9 public const byte Slot = 1; // 槽
10 public const byte Wall = 2; // 牆
11 public const byte Brick = 3; // 磚: 等同於牆,一般放在牆的外圍
12 public const byte Box0 = 4; // 箱子放在地上
13 public const byte Box1 = 5; // 箱子放在槽上
14 public const byte Man0 = 6; // 工人站在地上
15 public const byte Man1 = 7; // 工人站在槽上
16
17 const string mask = "-+#%xX()"; // (*.bxa)文件用,依次代表以上各項
18
19 public static string GetPenName(byte block)
20 {
21 return "地槽牆磚箱箱人人"[block & 0x07].ToString();
22 }
23
24 public static char GetChar(ushort block)
25 {
26 return mask[block & 0x07];
27 }
28
29 public static byte GetByte(char block)
30 {
31 return (byte)mask.IndexOf(block);
32 }
33
34 public static bool IsOk(ushort block)
35 {
36 return block <= Man1;
37 }
38
39 public static void CleanAllMark(ushort[,] bb)
40 {
41 for (int i = 0; i < bb.GetLength(0); i++)
42 for (int j = 0; j < bb.GetLength(1); j++)
43 bb[i, j] &= 0x07;
44 }
45
46 public static void Mark(ref ushort block, int value)
47 {
48 block |= (ushort)(value << 3);
49 }
50
51 public static int Value(ushort block)
52 {
53 return block >> 3;
54 }
55
56 public static void Update(ref ushort block, byte pen)
57 {
58 if (IsSlot(block) && pen == Block.Man0) pen = Block.Man1;
59 if (IsSlot(block) && pen == Block.Box0) pen = Block.Box1;
60 block = pen;
61 }
62
63 public static void ManIn(ref ushort block)
64 {
65 block += (Man0 - Land);
66 }
67
68 public static void ManOut(ref ushort block)
69 {
70 block -= (Man0 - Land);
71 }
72
73 public static void BoxIn(ref ushort block)
74 {
75 block += (Box0 - Land);
76 }
77
78 public static void BoxOut(ref ushort block)
79 {
80 block -= (Box0 - Land);
81 }
82
83 public static bool IsSlot(ushort block)
84 {
85 return block == Slot || block == Box1 || block == Man1;
86 }
87
88 public static bool IsBlank(ushort block)
89 {
90 return block == Land || block == Slot;
91 }
92
93 public static bool IsBox(ushort block)
94 {
95 return block == Box0 || block == Box1;
96 }
97
98 public static bool IsMan(ushort block)
99 {
100 return block == Man0 || block == Man1;
101 }
102 }
103 }
