贪吃蛇游戏

                    贪吃蛇游戏                   

#!/bin/sh

## 区域内部的可活动的范围。此处可修改相应的值
Width=50   # 偶数
Height=15
PadX=10
PadY=5
Speed="2"  # 1-9，值越小，速度越快

## 蛇起始位置
((SnakeX=PadX+Width/2))
((SnakeY=PadY+Height/2))
((ScoreX=PadX+Width/2-10))
((ScoreY=PadY-3))
score=0
SnakeHead="33[41m@33[0m"
SnakeBody="33[41m 33[0m"


P1="33[31mO33[0m"
P2="33[32mO33[0m"
P3="33[33mO33[0m"
P4="33[34mO33[0m"
P5="33[35mO33[0m"
P6="33[36mO33[0m"
P7="33[37mO33[0m"

PS=(" " $P1 $P2 $P3 $P4 $P5 $P6 $P7)
PNum=${#PS[*]}


clear
function DrawBox(){
   local XSmall XBig YSmall YBig
   ((XSmall=PadX-2))
   ((YSmall=PadY-1))
   ((XBig=PadX+Width))
   ((YBig=PadY+Height))
   for((i=XSmall;i<=XBig;i+=2))  
   do
      echo -ne "33[$YSmall;${i}H33[42m[]33[0m"
      echo -ne "33[$YBig;${i}H33[42m[]33[0m"
   done

   for((i=YSmall;i<=YBig;i++))   
   do
      echo -ne "33[$i;${XSmall}H33[42m[]33[0m"
      echo -ne "33[$i;${XBig}H33[42m[]33[0m"
   done
   echo
   echo
}


function CordToKey(){ 
   local x y Max
   Max=100
   x=$1
   y=$2
   ((x+=Max))
   ((y+=Max))
   echo $x$y
}

function Values(){ 
   local i j
   for((i=PadX;i<=PadX+Width;i++))
   do
      for((j=PadY;j<=PadY+Height;j++))
      do
        values[`CordToKey $i $j`]="$i|$j"
      done
   done
}

function GameOver(){
   local x y
   ((x=PadX+Width/2-5))
   ((y=PadY+Height+2))
   echo -e "33[$y;${x}H 33[32mGame Over!33[0m

"
   kill  $PPID
   MoveXYExit
}

function NewP(){                             
   local x y p v
   while :
   do
      ((x=RANDOM%Width+PadX))
      ((y=RANDOM%Height+PadY))
      v=${values[`CordToKey $x $y`]}
#      if [[ $v =~ "|" ]];then #bash 3(如果是bash 3，启用这行)
      if [[ $v =~ "|" ]];then #bash 4(如果是bash 4，启用这行)
         ((p=RANDOM%((PNum-1))+1))
         echo -ne "33[$y;${x}H${PS[$p]}"
         values[`CordToKey $x $y`]="$p"
         break
      fi
   done
}

function Moving(){                             
   local X Y oldX oldY v i j sx sy
   X=$1; Y=$2; oldX=$3; oldY=$4; v=$5
   echo -ne "33[$Y;${X}H$SnakeHead"         
   values[`CordToKey $X $Y`]="snake"         
   Snake $X $Y                             
   echo -ne "33[$oldY;${oldX}H$SnakeBody"    
   if [[ ${#v} != 1 ]];then                   
       for((i=0;i<${#SnakeValue[*]};i+=2))
       do
          if [ "${SnakeValue[$i]}" != "" ];then
             ((j=i+1))
             sx=${SnakeValue[$i]}
             sy=${SnakeValue[$j]}
             SnakeValue[$i]=""
             SnakeValue[$j]=""
             echo -ne "33[$sy;${sx}H "         
             values[`CordToKey $sx $sy`]="$sx|$sy" 
             break
          fi
       done
   else
       ((score+=v))
       echo -ne "33[$ScoreY;${ScoreX}H 33[32m Score: $score 33[0m"
       NewP
   fi

}

function Snake(){   
    SnakeValue[${#SnakeValue[*]}]=$1
    SnakeValue[${#SnakeValue[*]}]=$2
}

function MoveXY(){ 
    local  sig oldX oldY v
    Init

    trap "sig=26" 26
    trap "sig=27" 27
    trap "sig=28" 28
    trap "sig=29" 29
    trap "MoveXYExit" 30

    while :
    do
       oldX=$X
       oldY=$Y

       case $sig in    
          28)((maxX=Width+PadX-1))
              ((X++))
              v=${values[`CordToKey $X $Y`]}
              [[ $X -gt $maxX || "$v" == "snake" ]] && GameOver
              ;;
          29)((X--))
              v=${values[`CordToKey $X $Y`]}
              [[ $X -lt $PadX || "$v" == "snake" ]] && GameOver
              ;;
          27)((maxY=Height+PadY-1))
              ((Y++))
              v=${values[`CordToKey $X $Y`]}
              [[ $Y -gt $maxY || "$v" == "snake" ]] && GameOver
             ;;
          26)((Y--))
              v=${values[`CordToKey $X $Y`]}
              [[ $Y -lt $PadY || "$v" == "snake" ]] && GameOver
             ;;
       esac
       Moving $X $Y $oldX $oldY $v
       sleep .$Speed
    done
}

function Init(){
    SnakeValue=()
    DrawBox
    Values
    X=$SnakeX
    Y=$SnakeY
    Snake $X $Y
    echo -ne "33[$Y;${X}H$SnakeHead"
    values[`CordToKey $X $Y`]="snake"
    echo -ne "33[$ScoreY;${ScoreX}H 33[32m Score: $score 33[0m"
    NewP
    NewP
    NewP
}

function MoveXYExit(){
    local y
    ((y=PadY+Height+2))
    echo -e "33[?25h33[${y};0H"
    echo
    exit
}

function MoveSnakeExit(){
    kill -30 $pid
    stty $sTTY
    MoveXYExit
}

function MoveSnake(){
    local key  sig
    pid=$1
    sTTY=`stty -g`
    echo -ne "33[?25l"   
    trap "MoveSnakeExit" INT TERM
    while :
    do
       sig=0
       read -s -n 1 key
       [[ "$key" == "A" ]] && sig=26    
       [[ "$key" == "B" ]] && sig=27    
       [[ "$key" == "C" ]] && sig=28    
       [[ "$key" == "D" ]] && sig=29     
       [[ "$key" == "q" ]] && MoveSnakeExit 
       [ $sig -ne 0 ] && kill -$sig  $pid 
   done
}

## Main ##
if [ "$1" == "MoveXY" ];then
   MoveXY
else
   bash $0 MoveXY &
   MoveSnake $!  2>/dev/null
fi