最近想系統(tǒng)看下base shell的基本語法知識，可是看了這些if else之后還是不知道做什么就想到寫了個貪吃蛇，我還以為我是第一個想到用shell寫貪吃蛇的呢，可是后來看到已經(jīng)有人寫過了，不過我也是懶的看別人代碼的人，所以就用自己的思路實現(xiàn)了下，熟練下這些基本的shell語法。

寫這個重點是想練習(xí)下shell語法，所以貪吃蛇的實現(xiàn)算法倒不是重點，況且以前大學(xué)的時候各類小游戲用什么語言都寫過，這些小算法如果不考慮性能確實沒什么意思。

當(dāng)然了貪吃蛇最好用的數(shù)據(jù)結(jié)構(gòu)自然是stack，可是我真的不想花時間考慮用shell實現(xiàn)一個棧，所以就用一個靜態(tài)的一維數(shù)組和一個動態(tài)的一維數(shù)組實現(xiàn)的（shell中的數(shù)組本來就是動態(tài)的，我這樣說只是說我的實現(xiàn)的效果是這樣）。

環(huán)境

win10內(nèi)嵌的Linux beta版本（ubuntu14.0）帶的bash

如果有小伙伴復(fù)制下面代碼跑不動，請考慮下運行環(huán)境。

源碼

下面的中文注釋是剛才添加的，用的這個bash是不支持中文的，我的英文真的比較爛，所以剛才把中文注釋加了下

玩的時候使用上下左右鍵就行（本想用hjkl這四鍵控制上下左右的，覺得不太習(xí)慣）

主要思路就是：貪吃蛇運行界面使用一個后臺進程，用另一個進程來監(jiān)聽輸入（我最初的想法是一個shell進程就行，在貪吃蛇運行中的等待時間來監(jiān)聽輸入，后來發(fā)現(xiàn)還有這種玩法，我就改用這種實現(xiàn)，通過傳遞一個信號來處理）

#! /bin/bash
#下面是游戲界面的寬和高
# the width
with=42
# the height
height=22
#這個是游戲運行區(qū)域
# area
area=(
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 9
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 9
)
#bool
false=0
true=1
#貪吃蛇的一些信息
#snake info
head=47
tail=45
originPos=(45 46 47)
snakeBody=2
snakeFood=3
curPos=(${originPos[*]})
#game logic val
speed=0.2
foodPos=50
left=2
right=-2
up=3
down=-3
moveDirection=$right
eat=$true
#game info
side=$$
main=$!
#這個是開始時的界面
#start show interface
function startShowInterface()
{
    seconds=$1
    printf "\e[1;42m"
    printf "******************************************\n"
    for ((i=0; i<10; i++))
    do
        printf "*                                        *\n"
    done
    printf "*******\e[1;31msnake start after: $seconds seconds\e[0m\e[1;42m*******\n"
    for ((i=0; i<10; i++))
    do
        printf "*                                        *\n"
    done
    printf "******************************************\n"
    printf "\e[0m"
}
#start show 
function startShow()
{
    seconds=1;
    while [[ $seconds -gt -1 ]];
    do
        clear;
        startShowInterface $seconds;
        sleep 1;
        let seconds--;
    done
}
startShow;
#這個是游戲顯示界面
# game main inteface
function gameMainInterface
{
    clear;
    pos=0
    echo -e "\e[1;42m"
    for data in ${area[@]};
    do
        case $data in
        [9])
            printf "\n"
        ;;
        [1])
            printf "#"
        ;;
        [0])
            printf " "
        ;;
        [$snakeBody])
            printf "\e[1;31m"
            if [[ $pos = $head ]]; then
                printf "@"
            else
                printf "*"
            fi
            printf "\e[0m\e[1;42m"
        ;;
        [$snakeFood])
            printf "\e[1;34m&\e[0m\e[1;42m"
        ;;
        esac
        let pos++
    done
    echo -e "\e[0m"
}
#initinal snake body and pos
function initSnake()
{
    for data in ${originPos[@]};
    do
        area[$data]=$snakeBody
    done
}
initSnake;
#繪制貪吃蛇
#draw snake
function drawSnake()
{
    for data in ${originPos[@]};
    do
        area[$data]=0
    done
    for data in ${curPos[@]};
    do
        area[$data]=$snakeBody
    done
}
#隨機生成食物位置
#generate food
function generateFood()
{
    if [[ $eat = $false ]]; then
        return
    fi
    done=$false
    while [[ $done = $false ]];
    do
        newFoodPos=$(( RANDOM%$(( $(( $with-1 ))*$(( $height-1 )) )) ))
        [[ ${area[$newFoodPos]} = 0 ]] && area[$foodPos]=0 && foodPos=$newFoodPos && (( area[$foodPos]=$snakeFood )) && done=$true && eat=$false
    done
}
#貪吃蛇移動的算法，用的一維數(shù)組，我也就這樣來實現(xiàn)了
#move
function snakeMove()
{
    originPos=(${curPos[*]})
    length=${#curPos[*]}
    head=${curPos[$(( $length-1 ))]}
    case $moveDirection in
    $left)
        let head--
        [[ $(( $(( $head-2 ))%$with )) -eq 0 ]] && kill -35 $side
    ;;
    $right)
        let head++
        [[ $(( $head%$with )) -eq 0 ]] && kill -35 $side
    ;;
    $up)
        let head=head-with
        let head--
        [[ $head -lt $with ]] && kill -35 $side
    ;;
    $down)
        let head=head+with
        let head++
        [[ $head -gt $(( $with*$(( $height-1 )) )) ]] && kill -35 $side
    ;;
    esac
    if [[ $head -eq $foodPos ]];    then
        curPos[length]=$head
        eat=$true
    else
        for ((i=0; i<$((length-1)); i++));
        do
            curPos[i]=${curPos[$((i+1))]}
        done
        curPos[$((length-1))]=$head
    fi
}
#游戲運行的進程，游戲主邏輯都在這里了
#main interface
function mainInterface
{
    trap "moveDirection=$left" 36
    trap "moveDirection=$right" 37
    trap "moveDirection=$up" 38
    trap "moveDirection=$down" 39
    run=$true
    while [[ $run -eq $true ]];
    do
        generateFood;
        snakeMove;
        drawSnake;
        clear;
        gameMainInterface;
        sleep $speed
    done
}
mainInterface &
main=$!
# move snake
function moveDirectionUpdate()
{
    if [[ $(( $1+$2 )) -eq 0 || $1 -eq $2 ]];then   
        return;
    fi
    case $2 in
    $left)
        kill -36 $main
    ;;
    $right)
        kill -37 $main
    ;;
    $up)
        kill -38 $main
    ;;
    $down)
        kill -39 $main
    ;;
    esac
}
#監(jiān)聽上下左右鍵的輸入
#watch input
function watchInput()
{
    curDirection=$left
    preDirection=$curDirection
    while :;
    do
        read -s -n 1 op;
        [[ $op = "q" ]] && kill -9 $! && return;
        [[ $op = "A" ]] && preDirection=$curDirection && curDirection=$up && moveDirectionUpdate $preDirection $curDirection;
        [[ $op = "B" ]] && preDirection=$curDirection && curDirection=$down && moveDirectionUpdate $preDirection $curDirection;
        [[ $op = "C" ]] && preDirection=$curDirection && curDirection=$right && moveDirectionUpdate $preDirection $curDirection;
        [[ $op = "D" ]] && preDirection=$curDirection && curDirection=$left && moveDirectionUpdate $preDirection $curDirection;
    done
}
watchInput;
#game over
function gameOver()
{
    kill -9 $main
    echo "game over."
}
trap "gameOver" 35

到此這篇關(guān)于shell實現(xiàn)貪吃蛇的示例代碼的文章就介紹到這了,更多相關(guān)shell 貪吃蛇內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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