脚本游戏之二：贪吃蛇游戏新版

2211we · 发表于 2016-4-18 09:48:04

最近看了一个shell写的游戏：俄罗斯方块（下方有下载），受其启发重写了之前的一个小游戏：贪吃蛇。
之前写的那个需要用到临时文件，每个动作都需要多次读写，效率不行，看了别人的思路之后，很快就
重写一个。

以下变量定义了三部分内容：信号、边框属性和游戏本身PID，并对游戏等级做定义注释。

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#signal
upper=20
down=21
left=22
right=23
stop=24
stopI=25
pause=26
start=27
speedup=28
slowdown=29
quit=30

height=4
width=10
HEIGHT=20
WIDTH=30
upper_boundary=$((height+1))
down_boundary=$((height+HEIGHT+2))
left_boundary=$((width+1))
right_boundary=$((width+WIDTH+2))

MYPID=$$

#About the level and the score.
#time(s) 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0
#level 1 2 3 4 5 6 7 8 9 10

display_random_point函数用来在特定区域得到并显示一随机块。

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#get one random point in the border.
display_random_point(){
local i succ=0
while :; do
      while :; do
         point1=$((RANDOM%down_boundary))
         [[ $point1 -gt $upper_boundary ]] && [[ $point1 -lt $down_boundary ]] && break
      done
      while :; do
         point2=$((RANDOM%right_boundary))
         [[ $point2 -gt $left_boundary ]] && [[ $point1 -lt $right_boundary ]] && break
      done
      #for sure, not in the body points.
      for((i=0; i<${#snake_body[@]}; i++)); do
         [[ "$point1 $point2" == "${snake_body} ${snake_body[i+1]}" ]] && { succ=1; break; }
      done
      [[ $succ -eq 0 ]] && break
done
random_point=($point1 $point2)
echo -ne "[${point1};${point2}H[44m [0m"
}

exit_game 退出游戏

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exit_game(){
kill -$stopI $MYPID
tput cnorm
echo -e "[$(((height+HEIGHT+2)/2));$(((width+WIDTH)/2))H[33mSnake Dead !![0m"
echo -e "[$((height+HEIGHT+3));$((width+WIDTH+3))H [0m"
exit
}

display_element 后台运行函数，用来捕捉信号、显示游戏边框等信息以及移动蛇身

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display_element(){

#隐藏鼠标
tput civis #Hide cursor

#捕捉信号
trap 'DIRECTION=upper' $upper
trap 'DIRECTION=down'  $down
trap 'DIRECTION=left'  $left
trap 'DIRECTION=right' $right
trap 'STOP=1'       $stop
trap 'IFPAUSE=1'    $pause
trap 'IFPAUSE=0'    $start
trap '((level++))'    $speedup
trap '((level--))'    $slowdown
trap 'exit_game'    $quit

#定义部分局部变量
score=0
level=5
STOP=0
DIRECTION=right
old_direction=$DIRECTION
snake_body=( $((height+2)) $((width+2)) )

#画边框
      local i
      for((i=height+1; i<=height+HEIGHT+2; i++))
      do
            echo -ne "[${i};$((width+1))H[42m [0m"
            echo -ne "[${i};$((width+WIDTH+2))H[42m [0m"
      done
      for((i=width+1; i<=width+WIDTH+2; i++))
      do
            echo -ne "[$((height+1));${i}H[42m [0m"
            echo -ne "[$((height+HEIGHT+2));${i}H[42m [0m"
      done

      #显示成绩、等级和运行状态
      echo -ne "[${snake_body[0]};${snake_body[1]}H[41m [0m"
      echo -ne "[$((height+2));$((width+WIDTH+3))H[1;34m Score: [1;39m$score[0m"
      echo -ne "[$((height+4));$((width+WIDTH+3))H[1;34m Level: [1;35m$level[0m"
      echo -ne "[$((height+6));$((width+WIDTH+3))H[1;34m State: [1;5;32mrunning[0m"
echo -ne "[${height};$((width+7))H[35m[ Snake ] by LingYi[0m"
display_random_point

#后台循环，移动蛇身
while [[ $STOP -ne 1 ]]
do
      #不允许相反方向移动
      case $old_direction in
      'upper') [[ $DIRECTION == 'down'  ]] && DIRECTION=upper ;;
      'down' ) [[ $DIRECTION == 'upper' ]] && DIRECTION=down  ;;
      'left' ) [[ $DIRECTION == 'right' ]] && DIRECTION=left  ;;
      'right') [[ $DIRECTION == 'left'  ]] && DIRECTION=right ;;
      esac

      #得到新蛇头
      new_head[0]=${snake_body[$((${#snake_body[@]}-2))]}
      new_head[1]=${snake_body[$((${#snake_body[@]}-1))]}
      case $DIRECTION in
         'upper') ((new_head[0]-=1)) ;;
         'down' ) ((new_head[0]+=1)) ;;
         'left' ) ((new_head[1]-=1)) ;;
         'right') ((new_head[1]+=1)) ;;
      esac

      #判断边框碰撞
      case $DIRECTION in
      'upper') [[ ${new_head[0]} -eq $upper_boundary ]] && exit_game ;;
      'down' ) [[ ${new_head[0]} -eq $down_boundary  ]] && exit_game ;;
      'left' ) [[ ${new_head[1]} -eq $left_boundary  ]] && exit_game ;;
      'right') [[ ${new_head[1]} -eq $right_boundary ]] && exit_game ;;
      esac

      #判断蛇身碰撞
      local i
      for((i=0; i<${#snake_body[@]}; i++)); do
         [[ "${new_head[@]}" == "${snake_body} ${snake_body[i+1]}" ]] && exit_game
      done

      #暂停、继续
      while [[ $IFPAUSE -eq 1 ]]; do
         echo -ne "[$((height+6));$((width+WIDTH+3))H[1;34m State: [1;5;31mpause  [0m"
      done
      echo -ne "[$((height+6));$((width+WIDTH+3))H[1;34m State: [1;32mrunning[0m"

      #加速、减速
      if [[ $old_level != $level ]]; then
         echo -ne "[$((height+4));$((width+WIDTH+3))H[1;34m Level: [1;35m$level[0m"
      fi
      old_level=$level

      #吃到随机块，显示成绩和级别信息
      if [[ ${new_head[@]} == ${random_point[@]} ]]; then
         snake_body=( ${snake_body[@]} ${new_head[@]} )
         display_random_point
         let score++
         [[ $((score%20)) -eq 0 ]] && let level++
         echo -ne "[$((height+2));$((width+WIDTH+3))H[1;34m Score: [1;39m$score[0m"
         echo -ne "[$((height+4));$((width+WIDTH+3))H[1;34m Level: [1;35m$level[0m"
      else
         echo -ne "[${snake_body[0]};${snake_body[1]}H [0m"
               snake_body=( $(echo ${snake_body[@]} | cut -d ' ' -f 3-) ${new_head[@]})
      fi
      echo -ne "[${new_head[0]};${new_head[1]}H[41m [0m"
      old_direction=$DIRECTION
      sleep 0.$((10-level))
done
}

以下是运行主体代码，主要是运行后台函数、捕捉按键和发送信号。

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clear
display_element &

back_pid=$!
trap 'EXIT=1' $stopI
trap 'kill -$stop $back_pid; stty echo; exit_game' 2

ESC=`echo -e ''`
while :; do
read -s -n 1 key

key=`echo $key | tr 'a-z' 'A-Z'`

[[ $key == ''  ]] && sig=$pause # 空格：暂停
[[ $key == 'C' ]] && sig=$start    # C键：继续
[[ $key == 'U' ]] && sig=$speedup # U键：加速
[[ $key == 'O' ]] && sig=$slowdown # Ｏ键：减速
[[ $key == 'Q' ]] && sig=$quit       #Ｑ键：退出

#改变移动方向
[[ $key == 'W' ]] || [[ $key == 'I' ]] && sig=$upper
[[ $key == 'S' ]] || [[ $key == 'K' ]] && sig=$down
[[ $key == 'D' ]] || [[ $key == 'L' ]] && sig=$right
[[ $key == 'A' ]] || [[ $key == 'J' ]] && sig=$left

[[ $key == $ESC ]] && {
      for (( i=0; i<=1; i++ )); do read -s -n 1  KEY[$i]; done
      [[ ${KEY[0]} == $ESC  ]] && sig=$stop
      [[ ${KEY[0]} == '[' ]] && {
         [[ ${KEY[1]} == 'A' ]] &&  sig=$upper
         [[ ${KEY[1]} == 'B' ]] &&  sig=$down
         [[ ${KEY[1]} == 'C' ]] &&  sig=$right
         [[ ${KEY[1]} == 'D' ]] &&  sig=$left
      }
   }
      #发送信号
[[ $EXIT -ne 1 ]] && kill -$sig $back_pid || break
done

演示：

下载：

game_snake.rar (1.94 KB, 下载次数: 2)

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脚本游戏之二：贪吃蛇游戏新版

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