Shell贪吃蛇（38快乐版）(2017-03-09)

2280阅读　0评论2017-03-09　seesea2517
分类：LINUX

楠妹子发了一个活动，要用代码来庆祝3.8节：。
这里就把 Shell 飞机游戏(2013-03-15) 拿来改一个庆祝节日的贪吃蛇吧 :D
贴上游戏截图，一只庆祝快乐的蛇来收集爱心（v 字母像一个爱心吧，就拿它来充当了，没试出打印 ascii 爱心的办法）。

   
    

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  1. #!/bin/bash
  2. # Snake.sh
  3. # Created by seesea <seesea2517#126.com> @ 2017-03-08
  4. #
  5. # 楠妹子发了一个活动，要用代码来庆祝3.8节：http://bbs.chinaunix.net/thread-4260145-1-1.html
  6. # 这里就把 Shell 飞机游戏(2013-03-15) 拿来改一个庆祝节日的贪吃蛇吧 :D
  7. # 一只庆祝快乐的蛇来收集爱心（v 字母像一个爱心吧，就拿它来充当了，没试出打印 ascii 爱心的办法）
  8. # 做为简单 Demo，而且快乐的蛇应该是不死的，所以不做 GameOver 的处理啦

  10. source colors.sh

  12. # ============================================================================
  13. # 常量
  14. # ============================================================================

  16. # 响应的信号
  17. declare -r SIG_UP=SIGRTMIN+1
  18. declare -r SIG_DOWN=SIGRTMIN+2
  19. declare -r SIG_LEFT=SIGRTMIN+3
  20. declare -r SIG_RIGHT=SIGRTMIN+4
  21. declare -r SIG_PAUSE=SIGRTMIN+6
  22. declare -r SIG_EXIT=SIGRTMIN+7

  24. # 响应的按键（注意：使用大写配置）
  25. declare -r KEY_UP="W"
  26. declare -r KEY_DOWN="S"
  27. declare -r KEY_LEFT="A"
  28. declare -r KEY_RIGHT="D"
  29. declare -r KEY_PAUSE="P"
  30. declare -r KEY_EXIT="Q"

  32. # 游戏区域位置大小
  33. declare -r GAME_AREA_TOP=30
  34. declare -r GAME_AREA_LEFT=40
  35. declare -r GAME_AREA_WIDTH=40
  36. declare -r GAME_AREA_HEIGHT=20

  38. # 游戏边界显示字符（分横向和纵向两种字符）
  39. declare -r BORDER_H="${BHIG} ${NOR}"
  40. declare -r BORDER_V="${BHIG} ${NOR}"

  42. # ============================================================================
  43. # 全局变量/常量
  44. # ============================================================================

  46. declare stty_save # 终端设置
  47. declare game_overed=0 # 游戏中止标志
  48. declare game_paused=0 # 游戏暂停

  50. declare pid_loop # 消息循环的进程pid

  52. declare screen_width # 屏宽
  53. declare screen_height # 屏高
  54. declare game_map_width # 屏宽
  55. declare game_map_height # 屏高

  57. declare pos_head_r # 当前蛇头坐标：行
  58. declare pos_head_c # 当前蛇头坐标：列

  60. declare move_dir # 移动方向

  62. declare snake_len # 蛇长
  63. declare -a snake # 蛇体数据数组
  64. declare -a pos_snake_r # 每一节蛇体的坐标行值
  65. declare -a pos_snake_c # 每一节蛇体的坐标列值
  66. declare old_tail_pos_r # 移动后的蛇尾位置r
  67. declare old_tail_pos_c # 移动后的蛇尾位置c

  69. declare -ar food_style=( "${RED}v${NOR}" "${GRN}v${NOR}" "${YEL}v${NOR}" "${BLU}v${NOR}" "${MAG}v${NOR}" "${CYN}v${NOR}" "${WHT}v${NOR}" "${HIR}v${NOR}" "${HIG}v${NOR}" "${HIY}v${NOR}" "${HIB}v${NOR}" "${HIM}v${NOR}" "${HIC}v${NOR}" "${HIW}v${NOR}" )
  70. declare -r food_style_count=${#food_style[@]}
  71. declare food
  72. declare food_pos_r
  73. declare food_pos_c
  74. declare food_style_index

  76. # ============================================================================
  77. # 函数定义
  78. # ============================================================================

  80. # 随机函数
  81. # 参数一：随机数的上限+1，缺省为 10
  82. function random()
  83. {
  84.     echo $(( RANDOM % ${1:-10} ))
  85. }

  87. # 键盘输入响应函数
  88. function Input()
  89. {
  90.     while true
  91.     do
  92.         read -s -n 1 -a key
  93.         key="${key[@]: -1}"
  94.         case $key in
  95.             $KEY_UP) sign=$SIG_UP ;;
  96.             $KEY_DOWN) sign=$SIG_DOWN ;;
  97.             $KEY_LEFT) sign=$SIG_LEFT ;;
  98.             $KEY_RIGHT) sign=$SIG_RIGHT ;;
  99.             $KEY_PAUSE) sign=$SIG_PAUSE ;;
  100.             $KEY_EXIT) sign=$SIG_EXIT ;;
  101.             *) continue ;;
  102.         esac

  104.         kill -s $sign $pid_loop

  106.         # 若是退出按键，则根据游戏循环是否存在来判断是否确认退出
  107.         if (( sign == SIG_EXIT ))
  108.         then
  109.             sleep 0.1
  110.             if ! ps -p $pid_loop > /dev/null
  111.             then
  112.                 break
  113.             fi
  114.         fi
  115.     done
  116. }

  118. # 输入动作响应函数
  119. # 输入参数一：键盘消息
  120. function Action()
  121. {
  122.     sign=$1

  124.     # 若游戏暂停，则只响应暂停信号和退出信号
  125.     if (( game_paused && sign != SIG_PAUSE && sign != SIG_EXIT ))
  126.     then
  127.         return
  128.     fi

  130.     # 输入线程的暂停处理
  131.     if (( game_overed && sign == SIG_PAUSE ))
  132.     then
  133.         return
  134.     fi

  136.     case $sign in
  137.         $SIG_UP) OnPressPlayerMove "U" ;;
  138.         $SIG_DOWN) OnPressPlayerMove "D" ;;
  139.         $SIG_LEFT) OnPressPlayerMove "L" ;;
  140.         $SIG_RIGHT) OnPressPlayerMove "R" ;;
  141.         $SIG_PAUSE) OnPressGamePause ;;
  142.         $SIG_EXIT) OnPressGameExit ;;
  143.     esac
  144. }

  146. # 系统初始化
  147. function Init()
  148. {
  149.     screen_width=$(tput cols)
  150.     screen_height=$(tput lines)

  152.     game_map_width=$GAME_AREA_WIDTH
  153.     game_map_height=$GAME_AREA_HEIGHT

  155.     # 终端设置
  156.     stty_save=$(stty -g) # 保存stty配置
  157.     stty -echo # 关闭输入回显
  158.     tput civis # 关闭光标
  159.     shopt -s nocasematch # 开启大小写case比较的开关
  160.     clear

  162.     # 有时候echo会提示中断的函数调用，目前没啥解决办法，就把错误提示屏蔽了先
  163.     exec 2> /dev/null
  164. }

  166. # 按键响应：游戏暂停
  167. function OnPressGamePause()
  168. {
  169.     game_paused=$(( ! game_paused ))
  170. }

  172. # 按键响应：退出游戏
  173. function OnPressGameExit()
  174. {
  175.     game_overed=1
  176. }

  178. # 按键响应：玩家动作
  179. # $1: U D L R = up down left right
  180. function OnPressPlayerMove()
  181. {
  182.     move_dir="$1"
  183. }

  185. function GameInit()
  186. {
  187.     # 设定输入响应函数
  188.     # trap Action $SIG_UP $SIG_DOWN $SIG_LEFT $SIG_RIGHT $SIG_PAUSE $SIG_SHOOT $SIG_EXIT
  189.     trap "Action $SIG_UP" $SIG_UP
  190.     trap "Action $SIG_DOWN" $SIG_DOWN
  191.     trap "Action $SIG_LEFT" $SIG_LEFT
  192.     trap "Action $SIG_RIGHT" $SIG_RIGHT
  193.     trap "Action $SIG_PAUSE" $SIG_PAUSE
  194.     trap "Action $SIG_EXIT" $SIG_EXIT

  196.     DrawBorder

  198.     (( pos_head_c = game_map_width / 2 + $GAME_AREA_LEFT - 1 ))
  199.     (( pos_head_r = game_map_height / 2 + $GAME_AREA_TOP - 1 ))
  200.     game_overed=0
  201.     move_dir='X'

  203.     # 测试和截图用 :D snake=(H A P P Y 3 . 8 "${HIM}v${NOR}" "${WHT}v${NOR}" "${RED}v${NOR}" "${GRN}v${NOR}" "${YEL}v${NOR}" "${YEL}v${NOR}" "${BLU}v${NOR}" "${MAG}v${NOR}" "${MAG}v${NOR}" "${CYN}v${NOR}" "${WHT}v${NOR}" "${HIR}v${NOR}" "${HIG}v${NOR}" "${HIY}v${NOR}" "${HIB}v${NOR}" "${MAG}v${NOR}" "${HIM}v${NOR}")
  204.     snake=(H A P P Y 3 . 8)
  205.     snake_len=${#snake[*]}
  206.     for (( i = 0; i < snake_len; ++i ))
  207.     do
  208.         pos_snake_r[$i]=$pos_head_r
  209.         pos_snake_c[$i]=$(( ((pos_head_c + i + 1 + game_map_width - $GAME_AREA_LEFT) % game_map_width) + $GAME_AREA_LEFT ))
  210.     done

  212.     RandomFood
  213. }

  215. # 游戏循环
  216. function GameLoop()
  217. {
  218.     GameInit

  220.     while true
  221.     do
  222.         if (( game_overed ))
  223.         then
  224.             break
  225.         fi

  227.         FrameAction
  228.         sleep 0.04 # 每秒25帧，sleep 0.04
  229.     done
  230. }

  232. function GameStart()
  233. {
  234.     GameLoop &
  235.     pid_loop=$!
  236. }

  238. function FrameAction()
  239. {
  240.     # 若游戏暂停，则不进行帧动作
  241.     if (( game_paused ))
  242.     then
  243.         return
  244.     fi

  246.     MoveSnake
  247.     if CheckAndEatFood
  248.     then
  249.         RandomFood
  250.     fi

  252.     DrawSnake
  253. }

  255. # 如果有吃到食物，返回真 0，否则返回假 1
  256. function CheckAndEatFood()
  257. {
  258.     if (( pos_head_r != food_pos_r || pos_head_c != food_pos_c ))
  259.     then
  260.         return 1
  261.     fi

  263.     snake[$snake_len]=$food
  264.     pos_snake_r[$snake_len]=$old_tail_pos_r
  265.     pos_snake_c[$snake_len]=$old_tail_pos_c
  266.     (( ++snake_len ))

  268.     return 0
  269. }

  271. function MoveSnake()
  272. {
  273.     case $move_dir in
  274.         'U') (( pos_head_r = ((pos_head_r - 1 + game_map_height - $GAME_AREA_TOP) % game_map_height) + $GAME_AREA_TOP )) ;;
  275.         'D') (( pos_head_r = ((pos_head_r + 1 + game_map_height - $GAME_AREA_TOP) % game_map_height) + $GAME_AREA_TOP )) ;;
  276.         'L') (( pos_head_c = ((pos_head_c - 1 + game_map_width - $GAME_AREA_LEFT) % game_map_width) + $GAME_AREA_LEFT )) ;;
  277.         'R') (( pos_head_c = ((pos_head_c + 1 + game_map_width - $GAME_AREA_LEFT) % game_map_width) + $GAME_AREA_LEFT )) ;;
  278.         *) return ;;
  279.     esac

  281.     (( tail_index = snake_len - 1 ))
  282.     old_tail_pos_r=${pos_snake_r[$tail_index]}
  283.     old_tail_pos_c=${pos_snake_c[$tail_index]}

  285.     for (( i = snake_len - 1; i >= 1; --i ))
  286.     do
  287.         pos_snake_r[$i]=${pos_snake_r[$(( i - 1 ))]}
  288.         pos_snake_c[$i]=${pos_snake_c[$(( i - 1 ))]}
  289.     done

  291.     pos_snake_r[0]=$pos_head_r
  292.     pos_snake_c[0]=$pos_head_c
  293. }

  295. function DrawSnake()
  296. {
  297.     echo -ne "${ESC}[${old_tail_pos_r};${old_tail_pos_c}H "

  299.     for (( i = 0; i < snake_len; ++i ))
  300.     do
  301.         pos_r=${pos_snake_r[$i]}
  302.         pos_c=${pos_snake_c[$i]}

  304.         echo -ne "${ESC}[${pos_r};${pos_c}H${snake[$i]}"
  305.     done
  306. }

  308. function DrawSnakeXXX()
  309. {
  310.     echo -ne "${ESC}[${old_tail_pos_r};${old_tail_pos_c}H "

  312.     for (( i = 1; i < snake_len - 1; ++i ))
  313.     do
  314.         (( j = i - 1 ))
  315.         pos_r=${pos_snake_r[$j]}
  316.         pos_c=${pos_snake_c[$j]}

  318.         echo -ne "${ESC}[${pos_r};${pos_c}H${snake[$i]}"
  319.     done

  321.     echo -ne "${ESC}[${pos_head_r};${pos_head_c}H${snake[0]}"
  322. }

  324. function RandomFood()
  325. {
  326.     # 暂不考虑蛇满屏的时候无法生成新食物的情况
  327.     while true
  328.     do
  329.         (( food_pos_r = $(random game_map_height) + $GAME_AREA_TOP ))
  330.         (( food_pos_c = $(random game_map_width) + $GAME_AREA_LEFT ))

  332.         again=0
  333.         for (( i = 0; i < snake_len; ++i ))
  334.         do
  335.             if (( pos_snake_r[i] == food_pos_r && pos_snake_c[i] == food_pos_c ))
  336.             then
  337.                 again=1
  338.                 break
  339.             fi
  340.         done

  342.         if (( again == 0 ))
  343.         then
  344.             break
  345.         fi
  346.     done

  348.     food_style_index=$(random $food_style_count)
  349.     food=${food_style[$food_style_index]}
  350.     echo -ne "${ESC}[${food_pos_r};${food_pos_c}H$food"
  351. }

  353. # 退出游戏清理操作
  354. function ExitClear()
  355. {
  356.     # 恢复大小写case比较的开关
  357.     shopt -u nocasematch

  359.     # 恢复stty配置
  360.     stty $stty_save
  361.     tput cnorm

  363.     clear
  364. }

  366. # 绘制边界
  367. function DrawBorder()
  368. {
  369.     local i
  370.     local border_h
  371.     local border_v
  372.     local r
  373.     local c
  374.     local c2

  376.     border_h=""
  377.     for (( i = 0; i < GAME_AREA_WIDTH + 1; ++i ))
  378.     do
  379.         border_h="$border_h$BORDER_H"
  380.     done

  382.     # 画顶边
  383.     r=$(( GAME_AREA_TOP - 1 ))
  384.     c=$(( GAME_AREA_LEFT - 1 ))
  385.     echo -ne "${ESC}[${r};${c}H${border_h}"

  387.     # 画底边
  388.     r=$(( GAME_AREA_TOP + GAME_AREA_HEIGHT ))
  389.     echo -ne "${ESC}[${r};${c}H${border_h}"

  391.     c2=$(( GAME_AREA_LEFT - 1 + GAME_AREA_WIDTH + 1 ))
  392.     for (( r = GAME_AREA_TOP - 1; r < GAME_AREA_TOP + GAME_AREA_HEIGHT + 1; ++r ))
  393.     do
  394.         echo -ne "${ESC}[${r};${c}H${BORDER_V}${ESC}[${r};${c2}H${BORDER_V}"
  395.     done
  396. }

  398. # 主函数
  399. function Main()
  400. {
  401.     Init

  403.     GameStart
  404.     Input
  405.     ExitClear
  406. }

  408. Main


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