来不及解释了快上车！

其实UNIX的核心C语言就是丹尼斯·里奇玩游戏时觉得系统运行效率太低从而自行开发的编程语言，显然现代Linux的发展主要是用于生信及服务器管理，今天我们来不忘“初心”，看看UNIX下有哪些好玩的小游戏！

一、来不及解释了快上车

conda install sl
sl#注意是SL不是ls

我们来看看小火车的效果：

二、俄罗斯方块

经典游戏，不解释，代码如文末

三、坦克大战

小霸王er必玩

#!/bin/bash
#这是俄罗斯方块！
# Tetris Game
# 10.21.2003 xhchen< [email][e-mail][/email]>
 
#APP declaration
APP_NAME="${0##*[\\/]}"
APP_VERSION="1.0"
 
 
#颜色定义
cRed=1
cGreen=2
cYellow=3
cBlue=4
cFuchsia=5
cCyan=6
cWhite=7
colorTable=($cRed $cGreen $cYellow $cBlue $cFuchsia $cCyan $cWhite)
 
#位置和大小
iLeft=3
iTop=2
((iTrayLeft = iLeft + 2))
((iTrayTop = iTop + 1))
((iTrayWidth = 10))
((iTrayHeight = 15))
 
#颜色设置
cBorder=$cGreen
cScore=$cFuchsia
cScoreValue=$cCyan
 
#控制信号
#改游戏使用两个进程，一个用于接收输入，一个用于游戏流程和显示界面;
#当前者接收到上下左右等按键时，通过向后者发送signal的方式通知后者。
sigRotate=25
sigLeft=26
sigRight=27
sigDown=28
sigAllDown=29
sigExit=30
 
#七中不同的方块的定义
#通过旋转，每种方块的显示的样式可能有几种
box0=(0 0 0 1 1 0 1 1)
box1=(0 2 1 2 2 2 3 2 1 0 1 1 1 2 1 3)
box2=(0 0 0 1 1 1 1 2 0 1 1 0 1 1 2 0)
box3=(0 1 0 2 1 0 1 1 0 0 1 0 1 1 2 1)
box4=(0 1 0 2 1 1 2 1 1 0 1 1 1 2 2 2 0 1 1 1 2 0 2 1 0 0 1 0 1 1 1 2)
box5=(0 1 1 1 2 1 2 2 1 0 1 1 1 2 2 0 0 0 0 1 1 1 2 1 0 2 1 0 1 1 1 2)
box6=(0 1 1 1 1 2 2 1 1 0 1 1 1 2 2 1 0 1 1 0 1 1 2 1 0 1 1 0 1 1 1 2)
#所有其中方块的定义都放到box变量中
box=(${box0[@]} ${box1[@]} ${box2[@]} ${box3[@]} ${box4[@]} ${box5[@]} ${box6[@]})
#各种方块旋转后可能的样式数目
countBox=(1 2 2 2 4 4 4)
#各种方块再box数组中的偏移
offsetBox=(0 1 3 5 7 11 15)
 
#每提高一个速度级需要积累的分数
iScoreEachLevel=50        #be greater than 7
 
#运行时数据
sig=0                #接收到的signal
iScore=0        #总分
iLevel=0        #速度级
boxNew=()        #新下落的方块的位置定义
cBoxNew=0        #新下落的方块的颜色
iBoxNewType=0        #新下落的方块的种类
iBoxNewRotate=0        #新下落的方块的旋转角度
boxCur=()        #当前方块的位置定义
cBoxCur=0        #当前方块的颜色
iBoxCurType=0        #当前方块的种类
iBoxCurRotate=0        #当前方块的旋转角度
boxCurX=-1        #当前方块的x坐标位置
boxCurY=-1        #当前方块的y坐标位置
iMap=()                #背景方块图表
 
#初始化所有背景方块为-1, 表示没有方块
for ((i = 0; i < iTrayHeight * iTrayWidth; i++)); do iMap[$i]=-1; done
 
 
#接收输入的进程的主函数
function RunAsKeyReceiver()
{
        local pidDisplayer key aKey sig cESC sTTY
 
        pidDisplayer=$1
        aKey=(0 0 0)
 
        cESC=`echo -ne "\033"`
        cSpace=`echo -ne "\040"`
 
        #保存终端属性。在read -s读取终端键时，终端的属性会被暂时改变。
        #如果在read -s时程序被不幸杀掉，可能会导致终端混乱，
        #需要在程序退出时恢复终端属性。
        sTTY=`stty -g`
 
        #捕捉退出信号
        trap "MyExit;" INT TERM
        trap "MyExitNoSub;" $sigExit
 
        #隐藏光标
        echo -ne "\033[?25l"
 
 
        while :
        do
                #读取输入。注-s不回显，-n读到一个字符立即返回
                read -s -n 1 key
 
                aKey[0]=${aKey[1]}
                aKey[1]=${aKey[2]}
                aKey[2]=$key
                sig=0
 
                #判断输入了何种键
                if [[ $key == $cESC && ${aKey[1]} == $cESC ]]
                then
                        #ESC键
                        MyExit
                elif [[ ${aKey[0]} == $cESC && ${aKey[1]} == "[" ]]
                then
                        if [[ $key == "A" ]]; then sig=$sigRotate        #<向上键>
                        elif [[ $key == "B" ]]; then sig=$sigDown        #< 向下键>
                        elif [[ $key == "D" ]]; then sig=$sigLeft        #< 向左键>
                        elif [[ $key == "C" ]]; then sig=$sigRight        #< 向右键>
                        fi
                elif [[ $key == "W" || $key == "w" ]]; then sig=$sigRotate        #W, w
                elif [[ $key == "S" || $key == "s" ]]; then sig=$sigDown        #S, s
                elif [[ $key == "A" || $key == "a" ]]; then sig=$sigLeft        #A, a
                elif [[ $key == "D" || $key == "d" ]]; then sig=$sigRight        #D, d
                elif [[ "[$key]" == "[]" ]]; then sig=$sigAllDown        #空格键
                elif [[ $key == "Q" || $key == "q" ]]                        #Q, q
                then
                        MyExit
                fi
 
                if [[ $sig != 0 ]]
                then
                        #向另一进程发送消息
                        kill -$sig $pidDisplayer
                fi
        done
}
 
#退出前的恢复
function MyExitNoSub()
{
        local y
 
        #恢复终端属性
        stty $sTTY
        ((y = iTop + iTrayHeight + 4))
 
        #显示光标
        echo -e "\033[?25h\033[${y};0H"
        exit
}
 
 
function MyExit()
{
        #通知显示进程需要退出
        kill -$sigExit $pidDisplayer
 
        MyExitNoSub
}
 
 
#处理显示和游戏流程的主函数
function RunAsDisplayer()
{
        local sigThis
        InitDraw
 
        #挂载各种信号的处理函数
        trap "sig=$sigRotate;" $sigRotate
        trap "sig=$sigLeft;" $sigLeft
        trap "sig=$sigRight;" $sigRight
        trap "sig=$sigDown;" $sigDown
        trap "sig=$sigAllDown;" $sigAllDown
        trap "ShowExit;" $sigExit
 
        while :
        do
                #根据当前的速度级iLevel不同，设定相应的循环的次数
                for ((i = 0; i < 21 - iLevel; i++))
                do
                        sleep 0.02
                        sigThis=$sig
                        sig=0
 
                        #根据sig变量判断是否接受到相应的信号
                        if ((sigThis == sigRotate)); then BoxRotate;        #旋转
                        elif ((sigThis == sigLeft)); then BoxLeft;        #左移一列
                        elif ((sigThis == sigRight)); then BoxRight;        #右移一列
                        elif ((sigThis == sigDown)); then BoxDown;        #下落一行
                        elif ((sigThis == sigAllDown)); then BoxAllDown;        #下落到底
                        fi
                done
                #kill -$sigDown $$
                BoxDown        #下落一行
        done
}
 
 
#BoxMove(y, x), 测试是否可以把移动中的方块移到(x, y)的位置, 返回0则可以, 1不可以
function BoxMove()
{
        local j i x y xTest yTest
        yTest=$1
        xTest=$2
        for ((j = 0; j < 8; j += 2))
        do
                ((i = j + 1))
                ((y = ${boxCur[$j]} + yTest))
                ((x = ${boxCur[$i]} + xTest))
                if (( y < 0 || y >= iTrayHeight || x < 0 || x >= iTrayWidth))
                then
                        #撞到墙壁了
                        return 1
                fi
                if ((${iMap[y * iTrayWidth + x]} != -1 ))
                then
                        #撞到其他已经存在的方块了
                        return 1
                fi
        done
        return 0;
}
 
 
#将当前移动中的方块放到背景方块中去,
#并计算新的分数和速度级。(即一次方块落到底部)
function Box2Map()
{
        local j i x y xp yp line
 
        #将当前移动中的方块放到背景方块中去
        for ((j = 0; j < 8; j += 2))
        do
                ((i = j + 1))
                ((y = ${boxCur[$j]} + boxCurY))
                ((x = ${boxCur[$i]} + boxCurX))
                ((i = y * iTrayWidth + x))
                iMap[$i]=$cBoxCur
        done
 
        #消去可被消去的行
        line=0
        for ((j = 0; j < iTrayWidth * iTrayHeight; j += iTrayWidth))
        do
                for ((i = j + iTrayWidth - 1; i >= j; i--))
                do
                        if ((${iMap[$i]} == -1)); then break; fi
                done
                if ((i >= j)); then continue; fi
 
                ((line++))
                for ((i = j - 1; i >= 0; i--))
                do
                        ((x = i + iTrayWidth))
                        iMap[$x]=${iMap[$i]}
                done
                for ((i = 0; i < iTrayWidth; i++))
                do
                        iMap[$i]=-1
                done
        done
 
        if ((line == 0)); then return; fi
 
        #根据消去的行数line计算分数和速度级
        ((x = iLeft + iTrayWidth * 2 + 7))
        ((y = iTop + 11))
        ((iScore += line * 2 - 1))
        #显示新的分数
        echo -ne "\033[1m\033[3${cScoreValue}m\033[${y};${x}H${iScore}         "
        if ((iScore % iScoreEachLevel < line * 2 - 1))
        then
                if ((iLevel < 20))
                then
                        ((iLevel++))
                        ((y = iTop + 14))
                        #显示新的速度级
                        echo -ne "\033[3${cScoreValue}m\033[${y};${x}H${iLevel}        "
                fi
        fi
        echo -ne "\033[0m"
 
 
        #重新显示背景方块
        for ((y = 0; y < iTrayHeight; y++))
        do
                ((yp = y + iTrayTop + 1))
                ((xp = iTrayLeft + 1))
                ((i = y * iTrayWidth))
                echo -ne "\033[${yp};${xp}H"
                for ((x = 0; x < iTrayWidth; x++))
                do
                        ((j = i + x))
                        if ((${iMap[$j]} == -1))
                        then
                                echo -ne "  "
                        else
                                echo -ne "\033[1m\033[7m\033[3${iMap[$j]}m\033[4${iMap[$j]}m[]\033[0m"
                        fi
                done
        done
}
 
 
#下落一行
function BoxDown()
{
        local y s
        ((y = boxCurY + 1))        #新的y坐标
        if BoxMove $y $boxCurX        #测试是否可以下落一行
        then
                s="`DrawCurBox 0`"        #将旧的方块抹去
                ((boxCurY = y))
                s="$s`DrawCurBox 1`"        #显示新的下落后方块
                echo -ne $s
        else
                #走到这儿, 如果不能下落了
                Box2Map                #将当前移动中的方块贴到背景方块中
                RandomBox        #产生新的方块
        fi
}
 
#左移一列
function BoxLeft()
{
        local x s
        ((x = boxCurX - 1))
        if BoxMove $boxCurY $x
        then
                s=`DrawCurBox 0`
                ((boxCurX = x))
                s=$s`DrawCurBox 1`
                echo -ne $s
        fi
}
 
#右移一列
function BoxRight()
{
        local x s
        ((x = boxCurX + 1))
        if BoxMove $boxCurY $x
        then
                s=`DrawCurBox 0`
                ((boxCurX = x))
                s=$s`DrawCurBox 1`
                echo -ne $s
        fi
}
 
 
#下落到底
function BoxAllDown()
{
        local k j i x y iDown s
        iDown=$iTrayHeight
 
        #计算一共需要下落多少行
        for ((j = 0; j < 8; j += 2))
        do
                ((i = j + 1))
                ((y = ${boxCur[$j]} + boxCurY))
                ((x = ${boxCur[$i]} + boxCurX))
                for ((k = y + 1; k < iTrayHeight; k++))
                do
                        ((i = k * iTrayWidth + x))
                        if (( ${iMap[$i]} != -1)); then break; fi
                done
                ((k -= y + 1))
                if (( $iDown > $k )); then iDown=$k; fi
        done
 
        s=`DrawCurBox 0`        #将旧的方块抹去
        ((boxCurY += iDown))
        s=$s`DrawCurBox 1`        #显示新的下落后的方块
        echo -ne $s
        Box2Map                #将当前移动中的方块贴到背景方块中
        RandomBox        #产生新的方块
}
 
 
#旋转方块
function BoxRotate()
{
        local iCount iTestRotate boxTest j i s
        iCount=${countBox[$iBoxCurType]}        #当前的方块经旋转可以产生的样式的数目
 
        #计算旋转后的新的样式
        ((iTestRotate = iBoxCurRotate + 1))
        if ((iTestRotate >= iCount))
        then
                ((iTestRotate = 0))
        fi
 
        #更新到新的样式, 保存老的样式(但不显示)
        for ((j = 0, i = (${offsetBox[$iBoxCurType]} + $iTestRotate) * 8; j < 8; j++, i++))
        do
                boxTest[$j]=${boxCur[$j]}
                boxCur[$j]=${box[$i]}
        done
 
        if BoxMove $boxCurY $boxCurX        #测试旋转后是否有空间放的下
        then
                #抹去旧的方块
                for ((j = 0; j < 8; j++))
                do
                        boxCur[$j]=${boxTest[$j]}
                done
                s=`DrawCurBox 0`
 
                #画上新的方块
                for ((j = 0, i = (${offsetBox[$iBoxCurType]} + $iTestRotate) * 8; j < 8; j++, i++))
                do
                        boxCur[$j]=${box[$i]}
                done
                s=$s`DrawCurBox 1`
                echo -ne $s
                iBoxCurRotate=$iTestRotate
        else
                #不能旋转，还是继续使用老的样式
                for ((j = 0; j < 8; j++))
                do
                        boxCur[$j]=${boxTest[$j]}
                done
        fi
}
 
 
#DrawCurBox(bDraw), 绘制当前移动中的方块, bDraw为1, 画上, bDraw为0, 抹去方块。
function DrawCurBox()
{
        local i j t bDraw sBox s
        bDraw=$1
 
        s=""
        if (( bDraw == 0 ))
        then
                sBox="\040\040"
        else
                sBox="[]"
                s=$s"\033[1m\033[7m\033[3${cBoxCur}m\033[4${cBoxCur}m"
        fi
 
        for ((j = 0; j < 8; j += 2))
        do
                ((i = iTrayTop + 1 + ${boxCur[$j]} + boxCurY))
                ((t = iTrayLeft + 1 + 2 * (boxCurX + ${boxCur[$j + 1]})))
                #\033[y;xH, 光标到(x, y)处
                s=$s"\033[${i};${t}H${sBox}"
        done
        s=$s"\033[0m"
        echo -n $s
}
 
 
#更新新的方块
function RandomBox()
{
        local i j t
 
        #更新当前移动的方块
        iBoxCurType=${iBoxNewType}
        iBoxCurRotate=${iBoxNewRotate}
        cBoxCur=${cBoxNew}
        for ((j = 0; j < ${#boxNew[@]}; j++))
        do
                boxCur[$j]=${boxNew[$j]}
        done
 
 
        #显示当前移动的方块
        if (( ${#boxCur[@]} == 8 ))
        then
                #计算当前方块该从顶端哪一行"冒"出来
                for ((j = 0, t = 4; j < 8; j += 2))
                do
                        if ((${boxCur[$j]} < t)); then t=${boxCur[$j]}; fi
                done
                ((boxCurY = -t))
                for ((j = 1, i = -4, t = 20; j < 8; j += 2))
                do
                        if ((${boxCur[$j]} > i)); then i=${boxCur[$j]}; fi
                        if ((${boxCur[$j]} < t)); then t=${boxCur[$j]}; fi
                done
                ((boxCurX = (iTrayWidth - 1 - i - t) / 2))
 
                #显示当前移动的方块
                echo -ne `DrawCurBox 1`
 
                #如果方块一出来就没处放，Game over!
                if ! BoxMove $boxCurY $boxCurX
                then
                        kill -$sigExit ${PPID}
                        ShowExit
                fi
        fi
 
 
 
        #清除右边预显示的方块
        for ((j = 0; j < 4; j++))
        do
                ((i = iTop + 1 + j))
                ((t = iLeft + 2 * iTrayWidth + 7))
                echo -ne "\033[${i};${t}H        "
        done
 
        #随机产生新的方块
        ((iBoxNewType = RANDOM % ${#offsetBox[@]}))
        ((iBoxNewRotate = RANDOM % ${countBox[$iBoxNewType]}))
        for ((j = 0, i = (${offsetBox[$iBoxNewType]} + $iBoxNewRotate) * 8; j < 8; j++, i++))
        do
                boxNew[$j]=${box[$i]};
        done
 
        ((cBoxNew = ${colorTable[RANDOM % ${#colorTable[@]}]}))
 
        #显示右边预显示的方块
        echo -ne "\033[1m\033[7m\033[3${cBoxNew}m\033[4${cBoxNew}m"
        for ((j = 0; j < 8; j += 2))
        do
                ((i = iTop + 1 + ${boxNew[$j]}))
                ((t = iLeft + 2 * iTrayWidth + 7 + 2 * ${boxNew[$j + 1]}))
                echo -ne "\033[${i};${t}H[]"
        done
        echo -ne "\033[0m"
}
 
 
#初始绘制
function InitDraw()
{
        clear
        RandomBox        #随机产生方块，这时右边预显示窗口中有方快了
        RandomBox        #再随机产生方块，右边预显示窗口中的方块被更新，原先的方块将开始下落
        local i t1 t2 t3
 
        #显示边框
        echo -ne "\033[1m"
        echo -ne "\033[3${cBorder}m\033[4${cBorder}m"
 
        ((t2 = iLeft + 1))
        ((t3 = iLeft + iTrayWidth * 2 + 3))
        for ((i = 0; i < iTrayHeight; i++))
        do
                ((t1 = i + iTop + 2))
                echo -ne "\033[${t1};${t2}H||"
                echo -ne "\033[${t1};${t3}H||"
        done
 
        ((t2 = iTop + iTrayHeight + 2))
        for ((i = 0; i < iTrayWidth + 2; i++))
        do
                ((t1 = i * 2 + iLeft + 1))
                echo -ne "\033[${iTrayTop};${t1}H=="
                echo -ne "\033[${t2};${t1}H=="
        done
        echo -ne "\033[0m"
 
 
        #显示"Score"和"Level"字样
        echo -ne "\033[1m"
        ((t1 = iLeft + iTrayWidth * 2 + 7))
        ((t2 = iTop + 10))
        echo -ne "\033[3${cScore}m\033[${t2};${t1}HScore"
        ((t2 = iTop + 11))
        echo -ne "\033[3${cScoreValue}m\033[${t2};${t1}H${iScore}"
        ((t2 = iTop + 13))
        echo -ne "\033[3${cScore}m\033[${t2};${t1}HLevel"
        ((t2 = iTop + 14))
        echo -ne "\033[3${cScoreValue}m\033[${t2};${t1}H${iLevel}"
        echo -ne "\033[0m"
}
 
 
#退出时显示GameOVer!
function ShowExit()
{
        local y
        ((y = iTrayHeight + iTrayTop + 3))
        echo -e "\033[${y};0HGameOver!\033[0m"
        exit
}
 
 
#显示用法.
function Usage
{
        cat << EOF
Usage: $APP_NAME
Start tetris game.
 
  -h, --help              display this help and exit
      --version           output version information and exit
EOF
}
 
 
#游戏主程序在这儿开始.
if [[ "$1" == "-h" || "$1" == "--help" ]]; then
        Usage
elif [[ "$1" == "--version" ]]; then
        echo "$APP_NAME $APP_VERSION"
elif [[ "$1" == "--show" ]]; then
        #当发现具有参数--show时，运行显示函数
        RunAsDisplayer
else
        bash $0 --show&        #以参数--show将本程序再运行一遍
        RunAsKeyReceiver $!        #以上一行产生的进程的进程号作为参数
fi

TE: 2016.02.23
#place temporary files
#这是坦克大战！
tmpdir='/tmp'

#u:up d:down l:left r:right
boundary_u=2
boundary_d=26
boundary_l=3
boundary_r=80

boundary_color=45
smallboundary_color=34
#

#about time (second)
#about color (x0:black x1:red  x2:green x3:Orange x4:blue x5:pink x6:light blue) x=[3|4]

#about tank
#if enemy_tank_color is empty, it will be random value of enemy_tank_color_type.
enemy_tank_color_type=( 41 43 43 45 44 46 )
enemy_tank_color=''

#level: 0    1  ..  8   9   10   11   ..  18  19 (20)
#time : 1.0 0.9 .. 0.2 0.1 0.09 0.08  .. 0.01 0 
game_level=9

my_tank_color=42

#about bullet
enemy_bullet_color=41
enemy_bullet_speed=0.02

my_bullet_color=41
my_bullet_speed=0

#after tank dead, next will appear
next_tank_interval_time=0.5

#about death symbol 
symbol_keep_time=1


#game PID
MYPID=$$

#
#SIGNAL: [20-31] [35-36]
#stop enemy tank signal: 20 (PID: $run_enemytank_pid)
#enemy tank be hitted: 22 (PID: $run_enemytank_pid)
#enemy tank pause: 23 (PID: $run_enemytank_pid)
#enemy tank continue after pause: 24 (PID: $run_enemytank_pid)
#enemy tank level/speed up: 28 (PID: $run_enemytank_pid)
#enemy tank level/slow down: 29 (PID: $run_enemytank_pid)
#stealth mode: 35 (PID: $run_enemytank_pid)
#cancel stealth mode: 36 (PID: $run_enemytank_pid)

#game over: 21 (PID: $MYPID)
#mytank pause: 25 (PID: $MYPID)
#mytank continue: 26 (PID: $MYPID)

#for "LingYi" components: 27 (PID: run_print_mywords_pid)
#for "infor" components: 30 (PID: run_print_infors_pid)
#for "Dtime" components: 31 (PID: run_print_dtime_pid)

#components [ true|false ]
print_mode=true
print_infor=true
print_LingYi=true
print_dtime=true
print_roll=true


expressions=('o(-"-)o' '^*(- -)*^' '($ _ $)' '(^O^)' 'Y(^_^)Y')
string1="you are so smart !"
string2="you are really talented !"
string3="Come on, boy !"
string4="I believe you will win !"
string5="Keep up the good work !"
strings=("$string1" "$string2" "$string3" "$string4" "$string5")
gameover_string="Stupid guy ~~ ha-ha !!!"
#

infor1="The game is running !"
infor2='Press "C" to continue !'
infor3='Press "P" to pause game !'
infor4='Press "U" to level up !'
infor5='Press "L" to slow down ! '
infor6='Press "Q" to end the game !'
infor7='Press "F" to kill one tank !'
infor8='Press "G" to open/close Stealth Mode !'
infor9='Press "V" to open/close God Mode '
infor10='press "N" to kill all tanks !'
infor11='if pressed "N", press M to close it !'
infor12='Press Space or Enter key to shoot !'
infors=("$infor1" "$infor2" "$infor3" "$infor4" "$infor5" "$infor6" "$infor7"\
  ${infors[@]} "$infor7" "$infor9" "$infor10" "$infor11" "$infor12")

roll_words="Tank Game  LingYi 2016.03.01 Y(^_^)Y"
# Positions of Enemytanks:
# =============================
# | 0           4           2 |
# |      9(random)            |
# | 7           8           5 |
# |                           |
# | 1           6           3 |
# =============================
#Define random positions, if allow using.
#value [ yes|no ]
random_9_position="yes"
random_8_position="no"
random_7_position="yes"
random_6_position="yes"
random_5_position="yes"
random_4_position="yes"
random_3_position="yes"
random_2_position="yes"
random_1_position="yes"
random_0_position="yes"

#get random direction.
GetRandDirect()
{
  case $[RANDOM%4] in 
    0) echo u;; 
    1) echo d;;
    2) echo l;; 
    3) echo r;; 
  esac; 
}

#display and record in the file.
#HandleTank {-d|-c} "x;y" {u|d|l|r} enemy/my
HandleTank()
{
  local hp=($(echo "$2" | awk -F';' '{print $1,$2}'))
  local body body_col
  body[0]="$2"
  case $3 in
  'u')
    body[1]="$((hp[0]+1));$((hp[1]-1))" 
    body[2]="$((hp[0]+1));$((hp[1]+1))" 
    body[3]="$((hp[0]+2));$((hp[1]-1))" 
    body[4]="$((hp[0]+2));$((hp[1]+1))" 
    ;;
  'd')
    body[1]="$((hp[0]-1));$((hp[1]+1))"
    body[2]="$((hp[0]-1));$((hp[1]-1))"
    body[3]="$((hp[0]-2));$((hp[1]+1))"
    body[4]="$((hp[0]-2));$((hp[1]-1))"
    ;;
  'l')
    body[1]="$((hp[0]+1));$((hp[1]+1))"
    body[2]="$((hp[0]-1));$((hp[1]+1))"
    body[3]="$((hp[0]+1));$((hp[1]+2))"
    body[4]="$((hp[0]-1));$((hp[1]+2))"
    ;;
  'r')
    body[1]="$((hp[0]-1));$((hp[1]-1))"
    body[2]="$((hp[0]+1));$((hp[1]-1))"
    body[3]="$((hp[0]-1));$((hp[1]-2))"
    body[4]="$((hp[0]+1));$((hp[1]-2))"
    ;;
  esac
  if [[ $1 == '-c' ]]; then
    local i
    for((i=0; i<5; i++)); do
      echo -ne "\033[${body[i]}H \033[0m"
    done
    return 
  fi
  case $4 in
  "enemy")
    body_col=$seted_enemy_tank_color 
    body_symbol=(' ' ' ' ' ' ' ' ' ')
    echo "${body[@]}" >${tmpdir}/enemybody ;;
  "my" )
    body_col=$my_tank_color 
    body_symbol=('*' '*' '*' '*' '*')
    echo "${body[@]}" >${tmpdir}/mybody    ;;
  *    )  : ;;
  esac
  for((i=0; i<5; i++)); do
    echo -ne "\033[${body[i]}H\033[${body_col}m${body_symbol[i]}\033[0m"
  done
}

DisplayRandTank()
{
  local positions='0123456789'
  [[ ${random_9_position} == "no" ]] && positions=$(echo $positions | sed "s/9//")
  [[ ${random_8_position} == "no" ]] && positions=$(echo $positions | sed "s/8//")
  [[ ${random_7_position} == "no" ]] && positions=$(echo $positions | sed "s/7//")
  [[ ${random_6_position} == "no" ]] && positions=$(echo $positions | sed "s/6//")
  [[ ${random_5_position} == "no" ]] && positions=$(echo $positions | sed "s/5//")
  [[ ${random_4_position} == "no" ]] && positions=$(echo $positions | sed "s/4//")
  [[ ${random_3_position} == "no" ]] && positions=$(echo $positions | sed "s/3//")
  [[ ${random_2_position} == "no" ]] && positions=$(echo $positions | sed "s/2//")
  [[ ${random_1_position} == "no" ]] && positions=$(echo $positions | sed "s/1//")
  [[ ${random_0_position} == "no" ]] && positions=$(echo $positions | sed "s/0//")
  local rand_direct=$(GetRandDirect)
  local rand_pos
  while :
  do 
    rand_pos=$[RANDOM%10]
    echo $positions | grep -q $rand_pos && break
  done

  #set enemy tank body color
  if [[ -z $enemy_tank_color ]]; then
    seted_enemy_tank_color=${enemy_tank_color_type[$(( RANDOM % ${#enemy_tank_color_type[@]} ))]}
  else
    seted_enemy_tank_color=$enemy_tank_color
  fi

  PositionNine(){
    local hand_1 hand_2
    while :
    do 
      head_1=$((RANDOM%boundary_d))
      [[ $head_1 -ge $(( boundary_u+3)) ]] && [[ $head_1 -le $(( boundary_d-3 )) ]] && break
    done
    while :
    do 
      head_2=$((RANDOM%boundary_r))
      [[ $head_2 -ge $(( boundary_l+3)) ]] && [[ $head_2 -le $(( boundary_r-3 )) ]] && break
    done
    hp="${head_1};${head_2}"
  }
  case $rand_direct in
  'u')
    case $rand_pos in 
    0) hp="$(( boundary_u+1 ));$(( boundary_l+2 ))" ;;
    1) hp="$(( boundary_d-3 ));$(( boundary_l+2 ))" ;;
    2) hp="$(( boundary_u+1 ));$(( boundary_r-2 ))" ;;
    3) hp="$(( boundary_d-3 ));$(( boundary_r-2 ))" ;;
    4) hp="$(( boundary_u+1 ));$(( (boundary_r-boundary_l)/2+boundary_l ))" ;;
    5) hp="$(( (boundary_d-boundary_u)/2+boundary_u ));$(( boundary_r-2 ))" ;;
    6) hp="$(( boundary_d-3 ));$(( (boundary_r-boundary_l)/2+boundary_l ))" ;;
    7) hp="$(( (boundary_d-boundary_u)/2+boundary_u ));$(( boundary_l+2 ))" ;;
    8) hp="$(( (boundary_d-boundary_u)/2+boundary_u));$(( (boundary_r-boundary_l)/2+boundary_l ))" ;;
    9) PositionNine ;;
    esac ;;
  'd')
    case $rand_pos in 
    0) hp="$(( boundary_u+3 ));$(( boundary_l+2 ))" ;;
    1) hp="$(( boundary_d-1 ));$(( boundary_l+2 ))" ;;
    2) hp="$(( boundary_u+3 ));$(( boundary_r-2 ))" ;;
    3) hp="$(( boundary_d-1 ));$(( boundary_r-2 ))" ;;
    4) hp="$(( boundary_u+3 ));$(( (boundary_r-boundary_l)/2+boundary_l  ))" ;;
    5) hp="$(( (boundary_d-boundary_u)/2+boundary_u ));$(( boundary_r-2 ))" ;;
    6) hp="$(( boundary_d-1 ));$(( (boundary_r-boundary_l)/2+boundary_l ))" ;;
    7) hp="$(( (boundary_d-boundary_u)/2+boundary_u ));$(( boundary_l+2 ))" ;;
    8) hp="$(( (boundary_d-boundary_u)/2+boundary_u ));$(( (boundary_r-boundary_l)/2+boundary_l ))" ;;
    9) PositionNine ;;
    esac ;;
  'l')
    case $rand_pos in 
    0) hp="$(( boundary_u+2 ));$(( boundary_l+1 ))" ;;
    1) hp="$(( boundary_d-2 ));$(( boundary_l+1 ))" ;;
    2) hp="$(( boundary_u+2 ));$(( boundary_r-3 ))" ;;
    3) hp="$(( boundary_d-2 ));$(( boundary_r-3 ))" ;;
    4) hp="$(( boundary_u+2 ));$(( (boundary_r-boundary_l)/2+boundary_l ))" ;;
    5) hp="$(( (boundary_d-boundary_u)/2+boundary_u ));$(( boundary_r-3 ))" ;;
    6) hp="$(( boundary_d-2 ));$(( (boundary_r-boundary_l)/2+boundary_l ))" ;;
    7) hp="$(( (boundary_d-boundary_u)/2+boundary_u ));$(( boundary_l+1 ))" ;;
    8) hp="$(( (boundary_d-boundary_u)/2+boundary_u ));$(( (boundary_r-boundary_l)/2+boundary_l ))" ;;
    9) PositionNine ;;
    esac ;;
  'r')
    case $rand_pos in
    0) hp="$(( boundary_u+2 ));$(( boundary_l+3 ))" ;;
    1) hp="$(( boundary_d-2 ));$(( boundary_l+3 ))" ;;
    2) hp="$(( boundary_u+2 ));$(( boundary_r-1 ))" ;;
    3) hp="$(( boundary_d-2 ));$(( boundary_r-1 ))" ;;
    4) hp="$(( boundary_u+2 ));$(( (boundary_r-boundary_l)/2+boundary_l ))" ;;
    5) hp="$(( (boundary_d-boundary_u)/2 ));$(( boundary_r-1 ))" ;;
    6) hp="$(( boundary_d-2 ));$(( (boundary_r-boundary_l)/2+boundary_l ))" ;;
    7) hp="$(( (boundary_d-boundary_u)/2+boundary_u ));$(( boundary_l+3 ))" ;;
    8) hp="$(( (boundary_d-boundary_u)/2+boundary_ ));$(( (boundary_r-boundary_l)/2+boundary_l ))" ;;
    9) PositionNine ;;
    esac ;;
  esac
  
  enemytank_direct=$rand_direct
  first_moving=true
  
  #clean up the small boundary
  local n m
  for n in 1 2 3 4 5 
  do
    for m in 4 5 6 7 8 9 10
    do 
      echo -ne "\033[$((boundary_u+n));$((boundary_r+m))H*\033[0m"  
    done
  done   
  #display a tank model in small boundary
  case $enemytank_direct in
  'u') small_boundary_tank_head="$((boundary_u+2));$((boundary_r+7))" ;;
  'd') small_boundary_tank_head="$((boundary_u+4));$((boundary_r+7))" ;;
  'l') small_boundary_tank_head="$((boundary_u+3));$((boundary_r+6))" ;;
  'r') small_boundary_tank_head="$((boundary_u+3));$((boundary_r+8))" ;;
  esac
  HandleTank -d "$small_boundary_tank_head" $enemytank_direct enemy
  
  HandleTank -d "$hp" $enemytank_direct enemy
  
}


#get a new position from new, old direction and an old position.
#GetNewPos $newdirect $olddirect $headpoint(x y)
GetNewPos(){
  local new_head=($3 $4)
  
  case $1 in
  'u')
    case $2 in
    'u') [[ new_head[0] -gt $((boundary_u+1)) ]] && (( new_head[0]-=1 ));;
    'd') (( new_head[0]-=2 ));;
    'l') (( new_head[0]-=1 )); (( new_head[1]+=1 ));;
    'r') (( new_head[0]-=1 )); (( new_head[1]-=1 ));;
    esac
    ;;
  'd')
    case $2 in
    'u') (( new_head[0]+=2 ));;
    'd') [[ new_head[0] -lt $((boundary_d-1)) ]] && (( new_head[0]+=1 ));;
    'l') (( new_head[0]+=1 )); (( new_head[1]+=1 ));;
    'r') (( new_head[0]+=1 )); (( new_head[1]-=1 ));;
    esac
    ;;
  'l')
    case $2 in
    'u') (( new_head[0]+=1 )); (( new_head[1]-=1 ));;
    'd') (( new_head[0]-=1 )); (( new_head[1]-=1 ));;
    'l') [[ new_head[1] -gt $((boundary_l+1)) ]] && (( new_head[1]-=1 ));;
    'r') (( new_head[1]-=2 ));;
    esac
    ;;
  'r')
    case $2 in
    'u') (( new_head[0]+=1 )); (( new_head[1]+=1 ));;
    'd') (( new_head[0]-=1 )); (( new_head[1]+=1 ));;
    'l') (( new_head[1]+=2 ));;
    'r') [[ new_head[1] -lt $((boundary_r-1)) ]] && (( new_head[1]+=1 ));;
    esac
    ;;
  esac
  echo "${new_head[@]}"
}

#it run in background
MoveEnemyTank(){

  local upgrade_count=10   
  local bullet_interval=10   #default value
  local bullet_interval_range=20
  local StopEnemyTank=false
  local BeHitted=false
  local PauseEnemyTank=false
  local game_score=0 
  local old_game_score=0
  local ignore_other_tank=false
  local kill_myself=false
  local kill_myself_always=false
  local god_mode=false
  local kill_once_by_god=false

  trap 'StopEnemyTank=true' 20
  trap 'BeHitted=true' 22
  trap 'PauseEnemyTank=true' 23
  trap 'PauseEnemyTank=false; print_running' 24
  trap '[[ $game_level -lt 19 ]] && (( game_level+=1)); print_level' 28
  trap '[[ $game_level -gt 0  ]] && (( game_level-=1)); print_level' 29
  trap 'ignore_other_tank=true' 35
  trap 'ignore_other_tank=false' 36
  trap 'kill_myself=true' 37
  trap 'kill_myself_always=true' 38
  trap 'kill_myself_always=false' 39
  trap 'god_mode=true' 40
  trap 'god_mode=false' 41
  trap 'kill_once_by_god=true' 42
  
  GetTimeFromLevel(){
    [[ $game_level -ge 1  ]] && [[ $game_level -le 9 ]] && echo "0.$((10-game_level))"
    [[ $game_level -ge 10 ]] && echo "0.0$((19-game_level))"
    [[ $game_level -eq 0  ]] && echo "1"
  }
  
  print_running(){
    echo -ne "\033[$((boundary_u+12));$((boundary_r+3))\
    H\033[41m\033[33mState\033[0m  \033[1;34mrunning\033[0m"
  }
  print_level(){
    echo -ne "\033[$((boundary_u+10));$((boundary_r+3))\
    H\033[42m\033[31mLevel\033[0m  \033[1;34m$game_level \033[0m"
  }
  while ! $StopEnemyTank 
  do

    echo -ne "\033[$((boundary_u+8));$((boundary_r+3))\
    H\033[43m\033[31mScore\033[0m  \033[1;34m$game_score\033[0m"
    [[ $old_game_score -ne $game_score ]] && [[ $((game_score%upgrade_count)) -eq 0 ]] && {
      [[ game_level -lt 19 ]] && (( game_level+=1 )) && old_game_score=$game_score
    }
    print_level
    
    current_direct=$enemytank_direct
    if $first_moving; then
      while :
      do 
        future_direct=$( GetRandDirect )
        [[ $future_direct != $current_direct ]] && { first_moving=false; break; }
      done
        
    else
      future_direct=$( GetRandDirect )
    fi
    enemytank_direct=$future_direct
    if [[ $current_direct != $future_direct ]]; then
      current_tank_head=( `awk '{print $1}' ${tmpdir}/enemybody | tr ';' ' '` )
      tank_head=( `GetNewPos $future_direct $current_direct ${current_tank_head[@]}` )
      HandleTank -c "${current_tank_head[0]};${current_tank_head[1]}" $current_direct enemy
      HandleTank -d "${tank_head[0]};${tank_head[1]}" $future_direct enemy
    fi
    
    #$ignore_other_tank || $god_mode && true_false_value=true || true_false_value=false
    #Bullet $enemytank_direct ${tank_head[@]} enemy $true_false_value &
    
    #get the random distance
    case $future_direct in
    'u') allow_distance=$(( tank_head[0]-boundary_u-1 )) ;;
    'd') allow_distance=$(( boundary_d-tank_head[0]-1 )) ;;
    'l') allow_distance=$(( tank_head[1]-boundary_l-1 )) ;;
    'r') allow_distance=$(( boundary_r-tank_head[1]-1 )) ;;
    esac
    [[ allow_distance -eq 0 ]] && continue
    rand_distance=$(( RANDOM % allow_distance + 1 ))
    
    for ((j=1; j<=$rand_distance; j++))
    do  
      $StopEnemyTank && break

      if [[ $bullet_interval -eq 0 ]]; then
        $ignore_other_tank || $god_mode && true_false_value=true || true_false_value=false
        Bullet $enemytank_direct ${tank_head[@]} enemy $true_false_value &
        bullet_interval=$(( RANDOM % bullet_interval_range + 1 ))
      fi

      #pause and continue
      while $PauseEnemyTank
      do 
        echo -ne "\033[$((boundary_u+12));$((boundary_r+3))\
        H\033[41m\033[33mState\033[0m  \033[1;34mPause  \033[0m"
      done

      # if be hitted, make another one
      $kill_myself && BeHitted=true 
      $kill_once_by_god && BeHitted=true
      $kill_myself_always && BeHitted=true
      if $BeHitted; then
        DisplayDeathSymbol $future_direct ${tank_head[@]} enemy &
        sleep $next_tank_interval_time
        DisplayRandTank

        #old_game_socre is for upgrade count.
        old_game_score=$game_score
        (( game_score+=1 ))
        
        (( bullet_interval-=1 ))

        BeHitted=false
        $kill_myself && kill_myself=false
        $kill_once_by_god && BeHitted=false
        break
      fi

      old_tank_head=(${tank_head[@]})
      case $future_direct in
      'u') (( tank_head[0]-=1 )) ;;
      'd') (( tank_head[0]+=1 )) ;;
      'l') (( tank_head[1]-=1 )) ;;
      'r') (( tank_head[1]+=1 )) ;;
      esac
      HandleTank -c "${old_tank_head[0]};${old_tank_head[1]}" $future_direct enemy
      HandleTank -d "${tank_head[0]};${tank_head[1]}" $future_direct enemy

      #judge if collision
      if $(CollisJudge); then
        $god_mode && {
          DisplayDeathSymbol $future_direct ${tank_head[@]} enemy &
          sleep $next_tank_interval_time
          DisplayRandTank
          old_game_score=$game_score
          (( game_score+=1 ))
          (( bullet_interval-=1 ))
          break
        }
         ! ${ignore_other_tank} && {
          DisplayDeathSymbol $future_direct ${tank_head[@]} enemy &
          kill -21 $MYPID
          StopEnemyTank=true
        }
      fi
      (( bullet_interval-=1 ))
      sleep $(GetTimeFromLevel)
    done
  done
}

MoveMyTank()
{
  old_mytank_direct=$mytank_direct
  old_mytank_head=(${mytank_head[@]})
  mytank_direct=$1
  mytank_head=( `GetNewPos $1 $old_mytank_direct ${old_mytank_head[@]}` )
  HandleTank -c "${old_mytank_head[0]};${old_mytank_head[1]}" $old_mytank_direct my
  HandleTank -d "${mytank_head[0]};${mytank_head[1]}" $mytank_direct my

  #collision judgement
  if $(CollisJudge); then
    if $if_god_mode; then
      kill -42 $$run_enemytank_pid &>/dev/null
      HandleTank -d "${mytank_head[0]};${mytank_head[1]}" $mytank_direct my  
    else
      kill -20 $run_enemytank_pid &>/dev/null
      kill -21 $MYPID
    fi
  fi
}

#Bullet $direct $headpoint(x y) { my | enemy [true|false] }
Bullet()
{
  #tank head point / bullet distance [thp/bdis]
  local thp=($2 $3) bdis n
  local myfile=${tmpdir}/mybody
  local enemyfile=${tmpdir}/enemybody

  case $4 in 
  "my") 
    bullet_color=$my_bullet_color
    bullet_symbol='@'
    bullet_speed=$my_bullet_speed ;;
  "enemy") 
    bullet_color=$enemy_bullet_color
    bullet_symbol=' '
    bullet_speed=$enemy_bullet_speed ;;
  esac
  
  case $1 in 
  'u') bdis=$(( thp[0]-boundary_u-2 )); (( thp[0]-=1 )) ;;
  'd') bdis=$(( boundary_d-thp[0]-2 )); (( thp[0]+=1 )) ;;
  'l') bdis=$(( thp[1]-boundary_l-2 )); (( thp[1]-=1 )) ;;
  'r') bdis=$(( boundary_r-thp[1]-2 )); (( thp[1]+=1 ));;
  esac

  
  for((n=1; n<=bdis; n++))
  do
    case $1 in 
    'u') (( thp[0]-=1 )) ;;
    'd') (( thp[0]+=1 )) ;;
    'l') (( thp[1]-=1 )) ;;
    'r') (( thp[1]+=1 )) ;;
    esac
    
    #if the files not exist, means game over.
    #[[ ! -f $myfile ]] || [[ ! -f $enemyfile ]] && break

    case $4 in
    "my")
      if echo " $(cat $enemyfile) " | grep -q " ${thp[0]};${thp[1]} "; then
        kill -22 `cat ${tmpdir}/run_enemytank_pid` &>/dev/null
        break
      fi ;;
    "enemy")
      if ! $5 && echo " $(cat $myfile) " | grep -q " ${thp[0]};${thp[1]} "; then
        kill -21 $MYPID
        break
      fi ;;
    esac
    echo -ne "\033[${thp[0]};${thp[1]}H\033[${bullet_color}m${bullet_symbol}\033[0m"
    sleep $bullet_speed
    echo -ne "\033[${thp[0]};${thp[1]}H \033[0m"
  done
}

#Collision judgment
CollisJudge()
{  
  local k ifcoll=false
  enemy_points=$(cat ${tmpdir}/enemybody)
  my_points=( `cat ${tmpdir}/mybody` )
  for((k=0; k<=4; k++))
  do
    echo " ${enemy_points} " | grep -q " ${my_points[k]} " && { ifcoll=true; break; }
  done
  echo $ifcoll
} 

#DisplayDeathSymbol $direct $tank_head_point(x y) my/enemy [notclean]
#it should be run in background !!
#SYMBOL MODEL
#   1
#  234
# 56789  # [ dead!]
#  012   # 10 11 12
#   3    # 13
#so, we just need to make sure 1,5,9,13 four point.

DisplayDeathSymbol()
{
  local center_point mnt_tank_head=($2 $3)
  local logfile char
  local points="2 3 4 6 7 8 10 11 12"
  case $4 in
  "my") 
    symbol_color=$my_tank_color 
    symbol_symbol='#';;
  "enemy")
    symbol_color=$seted_enemy_tank_color 
    symbol_symbol=' ';;
  esac
  #get the center point of the sysbol
  case $1 in 
  'u') 
    center_point[0]=$(( mnt_tank_head[0]+1 ))
    center_point[1]=${mnt_tank_head[1]} ;;
  'd')   
    center_point[0]=$(( mnt_tank_head[0]-1 ))
    center_point[1]=${mnt_tank_head[1]} ;;
  'l') 
    center_point[0]=${mnt_tank_head[0]}
    center_point[1]=$(( mnt_tank_head[1]+1 )) ;;
  'r')  
    center_point[0]=${mnt_tank_head[0]}
    center_point[1]=$(( mnt_tank_head[1]-1 )) ;;
  esac
  
  #get the thirteen point
  point_2="$[center_point[0]-1];$[center_point[1]-1]"
  point_3="$[center_point[0]-1];${center_point[1]}"
  point_4="$[center_point[0]-1];$[center_point[1]+1]"
  point_6="${center_point[0]};$[center_point[1]-1]"
  point_7="${center_point[0]};${center_point[1]}"
  point_8="${center_point[0]};$[center_point[1]+1]"
  point_10="$[center_point[0]+1];$[center_point[1]-1]"
  point_11="$[center_point[0]+1];${center_point[1]}"
  point_12="$[center_point[0]+1];$[center_point[1]+1]"
  if [[ $((center_point[0]-boundary_u)) -ge 3 ]]; then
    point_1="$[center_point[0]-2];${center_point[1]}"
    points="${points} 1"
  fi
  if [[ $((center_point[1]-boundary_l)) -ge 3 ]]; then
    point_5="${center_point[0]};$[center_point[1]-2]"
    points="${points} 5"
  fi
  if [[ $((boundary_r-center_point[1])) -ge 3 ]]; then
    point_9="${center_point[0]};$[center_point[1]+2]"
    points="${points} 9"
  fi
  if [[ $((boundary_d-center_point[0])) -ge 3 ]]; then
    point_13="$[center_point[0]+2];${center_point[1]}"
    points="${points} 13"
  fi
  for pn in $points
  do  
    case $pn in
    5) char='d' ;;
    6) char='e' ;;
    7) char='a' ;;
    8) char='d' ;;
    9) char='!' ;;
    *) char=" " ;;
    esac  
    eval echo -ne "\\\033\[\${point_${pn}}H\\\033\[${symbol_color}m\\\033\[31m${char}\\\033\[0m"
  done

  sleep $symbol_keep_time

  #clean up the symbol
  if [[ -z $5 ]]; then
    for pn in $points
    do
      eval echo -ne "\\\033\[\${point_${pn}}H \\\033\[0m"
    done
  fi
}

game_over()
{
  StopKeyboardInput=true
  kill -20 $run_enemytank_pid &>/dev/null
  $print_LingYi && kill -27 $run_print_mywords_pid &>/dev/null
  $print_infor  && kill -30 $run_print_infors_pid &>/dev/null
  $print_dtime  && kill -31 $run_print_dtime_pid &>/dev/null
  $print_mode   && kill -20 $run_print_mode_pid &>/dev/null
  $print_roll   && kill -10 $run_print_roll_words_pid &>/dev/null
  echo -ne "\033[$((boundary_u+12));$((boundary_r+3))H\033[41m\033[33mState\033[0m  \033[1;34mGame Over !!\033[0m"
  local line_posi=$(( (boundary_d-boundary_u)/2+boundary_u-2 ))
  local col_posi=$(( (boundary_r-boundary_l)/2+boundary_l-18 ))
  DisplayDeathSymbol $mytank_direct ${mytank_head[@]} my notclean
  echo -e "\033[$((line_posi + 0 ));${col_posi}H\033[1;31m-----------------------------------\033[0m"
  echo -e "\033[$((line_posi + 1 ));${col_posi}H\033[1;31m|                                 |\033[0m"
  echo -e "\033[$((line_posi + 2 ));${col_posi}H\033[1;31m|      Shit , You Are Dead !      |\033[0m"
  echo -e "\033[$((line_posi + 3 ));${col_posi}H\033[1;31m|                                 |\033[0m"
   echo -e "\033[$((line_posi + 4 ));${col_posi}H\033[1;31m-----------------------------------\033[0m"
  tput cnorm
  echo -ne "\033[$((boundary_d+1));$((boundary_r+1))H\n\033[0m"
  #read -s -t 1 -n 100 
}

print_mywords()
{
  [[ -z $strings ]] || [[ -z $expressions ]] && return
  StopSaying=false
  trap 'StopSaying=true' 27
  local oldwords space_sum="" i mywords="example" 
  local myexpress="" oldexpress
  
  echo -ne "\033[$((boundary_u+20));$((boundary_r+3))H\033[45m\033[1;39mLingYi\033[0m:"
  while ! $StopSaying 
  do   
    space_sum=" "
    
    #print the words and expression.
    mywords="${strings[$((RANDOM%${#strings[@]}))]}"
    myexpress="${expressions[$((RANDOM%${#expressions[@]}))]}"
    c1=3$((RANDOM%6+1))
    c2=3$((RANDOM%6+1))
    echo -ne "\033[$((boundary_u+21));$((boundary_r+3))H\033[1;${c1}m${mywords} \033[${c2}m${myexpress}\033[0m"
    sleep $((RANDOM%2))

    #clean up the words and expression
    for((i=1; i<=$((${#mywords}+${#myexpress})); i++))
    do
      space_sum="${space_sum} "
    done
    echo -ne "\033[$((boundary_u+21));$((boundary_r+3))H${space_sum}\033[0m"
  done
  c3=3$((RANDOM%6+1))
  echo -ne "\033[$((boundary_u+21));$((boundary_r+3))H\033[${c3}m${gameover_string}\033[0m"
}

print_infors()
{  
  [[ -z $infors ]] && return
  StopPrinting=false
  trap 'StopPrinting=true' 30
  local space_sum infor i

  echo -ne "\033[$((boundary_u+17));$((boundary_r+3))H\033[46m\033[1;39mInfor\033[0m: "
  while ! $StopPrinting
  do 
    space_sum=""
    infor="${infors[$((RANDOM%${#infors[@]}))]}"
    echo -ne "\033[$((boundary_u+18));$((boundary_r+3))H${infor}\033[0m"
    sleep $((RANDOM%2))
    
    for((i=1; i<=${#infor}; i++))
    do
      space_sum="${space_sum} "
    done
    echo -ne "\033[$((boundary_u+18));$((boundary_r+3))H${space_sum}\033[0m"
  done
  echo -ne "\033[$((boundary_u+18));$((boundary_r+3))HGame is over, bye !\033[0m"
}

print_dtime()
{
  StopDate=false
  trap 'StopDate=true' 31
  echo -ne "\033[$((boundary_u+23));$((boundary_r+3))H\033[42m\033[1;33mDtime\033[0m"
  while ! $StopDate
  do 
    echo -ne "\033[$((boundary_u+24));$((boundary_r+3))H$(date +'%Y.%m.%d %H:%M:%S')\033[0m"
    sleep 1
  done
}

print_mode()
{
  StopMode=false
  
  StealthModeState="off"
  SMc=31
  GodModeState="off"
  GMc=31
  KillAlwaysModeState="off"
  KMc=31
  trap 'StealthModeState="on "; SMc=32' 21
  trap 'StealthModeState="off"; SMc=31' 22
  trap 'GodModeState="on "; GMc=32' 23
  trap 'GodModeState="off"; GMc=31' 24
  trap 'KillAlwaysModeState="on "; KMc=32' 25
  trap 'KillAlwaysModeState="off"; KMc=31' 26
  trap 'StopMode=true' 20

  echo -ne "\033[$((boundary_u+14));$((boundary_r+3))H\033[43m\033[1;33mMode \033[0m"
  while ! $StopMode
  do
    STRING1="Stealth: $StealthModeState God: $GodModeState Kills: $KillAlwaysModeState"
    echo -ne "\033[$((boundary_u+15));$((boundary_r+3))\
    H\033[1;34mStealth: \033[${SMc}m$StealthModeState\033[0m"
    echo -ne "\033[$((boundary_u+15));$((boundary_r+17))\
    H\033[1;34mGod: \033[${GMc}m$GodModeState\033[0m"
    echo -ne "\033[$((boundary_u+15));$((boundary_r+26))\
    H\033[1;34mKills: \033[${KMc}m$KillAlwaysModeState\033[0m"
    sleep 1
  done
}

print_roll_words()
{
  local stop_roll=false
  local strings=$roll_words
  local line=$boundary_u
  local col_s=$((boundary_l+1))
  local col_e=$((boundary_r-1))
  local sleep_time=0.1
  local i
  local rull_pids=()

  trap 'stop_roll=true' 10

  print_char()
  {  local j old_j=$col_e
    local stop_print=false
    trap 'stop_print=true' 10
    for((j=$col_e; j>=col_s; j--))
    do  $stop_print && break
      [[ $i -eq $((${#strings}-1)) ]] && echo -ne "\033[${line};${old_j}H\033[${boundary_color}m \033[0m"
      echo -ne "\033[${line};${j}H\033[${boundary_color}m\033[1;37m${strings:i:1}\033[0m"
      old_j=$j  
      sleep $sleep_time
    done
  }
  while :
  do
    for((i=0; i<${#strings}; i++))
    do
      $stop_roll && break
      print_char &
      roll_pids=(${roll_pids[@]} $!)
      sleep $sleep_time
    done
    echo -ne "\033[${line};${col_s}H\033[${boundary_color}m \033[0m"
    $stop_roll && {
      for((i=0; i<${#roll_pids[@]}; i++))
      do
        kill -10 ${roll_pids[i]} &>/dev/null
      done
      break
    } 
    for((t=1; t<=12; t++))
    do
      $stop_roll && break || sleep 0.5
    done
    
  done
  for((i=boundary_l; i<=boundary_r; i++))
  do
    echo -ne "\033[${boundary_u};${i}H\033[${boundary_color}m \033[0m"
  done
}

#StealthMode true/false
StealthMode()
{
  [[ -n $if_god_mode ]] && $if_god_mode && return
  if_opened=${if_opened:-false}
  stealth_opened_times=${stealth_opened_times:-0}
  ! $if_opened && [[ $stealth_opened_times -eq 0 ]]&& {
    kill -35 $run_enemytank_pid &>/dev/null
    kill -21 $run_print_mode_pid &>/dev/null
    if_opened=true
    let stealth_opened_times++
    old_my_tank_color1=$my_tank_color
    my_tank_color=$boundary_color
    HandleTank -d "${mytank_head[0]};${mytank_head[1]}" $mytank_direct my
    return 
  }
  $if_opened && [[ $stealth_opened_times -ne 0 ]] && {
    kill -36 $run_enemytank_pid &>/dev/null
    kill -22 $run_print_mode_pid &>/dev/null
    if_opened=false
    let stealth_opened_times--
    my_tank_color=$old_my_tank_color1
    HandleTank -d "${mytank_head[0]};${mytank_head[1]}" $mytank_direct my
  }
}

GodMode()
{
  if_god_mode=${if_god_mode:-false}
  god_opened_times=${god_opened_times:-0}
  ! $if_god_mode && [[ $god_opened_times -eq 0 ]] && {
    kill -40 $run_enemytank_pid &>/dev/null
    kill -23 $run_print_mode_pid &>/dev/null
    if_god_mode=true
    let god_opened_times++
    old_my_tank_color2=$my_tank_color
    my_tank_color=41
    HandleTank -d "${mytank_head[0]};${mytank_head[1]}" $mytank_direct my
    return
  }
  $if_god_mode && [[ $god_opened_times -ne 0 ]] && {
    kill -41 $run_enemytank_pid &>/dev/null
    kill -24 $run_print_mode_pid &>/dev/null
    if_god_mode=false
    let god_opened_times--
    my_tank_color=$old_my_tank_color2
    HandleTank -d "${mytank_head[0]};${mytank_head[1]}" $mytank_direct my
  }
}

#-------------------------------------
#|         executable code           |
#-------------------------------------

DisFrame()
{ 
  stop=false
  trap "stop=true" 10
  while ! $stop
  do 
    for ((i=1; i<=cols;    i++)); do 
      echo -ne "\033[1;${i}H\033[4$((RANDOM%6+1))m \033[0m"
    done
    for ((i=2; i<=lines;   i++)); do 
      echo -ne "\033[${i};${cols}H\033[4$((RANDOM%6+1))m \033[0m"
    done
    for ((i=cols-1; i>=1 ; i--)); do 
      echo -ne "\033[${lines};${i}H\033[4$((RANDOM%6+1))m \033[0m"
    done
    for ((i=lines-1; i>=2; i--)); do 
      echo -ne "\033[${i};1H\033[4$((RANDOM%6+1))m \033[0m"
    done
    for ((i=2; i<=cols-1;  i++)); do 
      echo -ne "\033[2;${i}H\033[4$((RANDOM%6+1))m \033[0m"
    done
    for ((i=2; i<=lines-1; i++)); do 
      echo -ne "\033[${i};$[cols-1]H\033[4$((RANDOM%6+1))m \033[0m"
    done
    for ((i=cols-2; i>=2;  i--)); do 
      echo -ne "\033[$[lines-1];${i}H\033[4$((RANDOM%6+1))m \033[0m"
    done
    for ((i=lines-2; i>=2; i--)); do 
      echo -ne "\033[${i};2H\033[4$((RANDOM%6+1))m \033[0m"
    done
    sleep 0.1
  done
}

# $0 char sleep_time start_line end_line start_col  upper/low  upper/low  left/right
PrintChar2(){
  aa='echo -ne "\033[${i};${5}H\033[1;${6}m$1\033[0m"; sleep $2'
  bb='[[ $i -ne $4 ]] && echo -ne "\033[${i};${5}H\033[1;${6}m \033[0m"'
  if [[ ${8} == "left" ]]; then
    [[ ${7} == "upper" ]] && for((i=$3; i<=$4; i++)); do eval "$aa; $bb"; done
    [[ ${7} == "low"   ]] && for((i=$3; i>=$4; i--)); do eval "$aa; $bb"; done
  fi
}

cols=`tput cols`
lines=`tput lines`
clear

DisFrame &
DisFramePid=$!

#DisSymbol $[lines/2-6] $[cols/2-34] 32 
a='&&&&&    &     &    &&  &   &      &        &        &     &     &&&&&&'
b='  &     & &    &   & &  & &       & & &    & &      & &   &      &     '
c='  &    &&&&&   &  &  &  &&       &  &&&   &&&&&    &   & &   &&  &&&&&&'
d='  &   &     &  & &   &  & &       &   &  &     &  &     &     &  &     '
e='  &  &       & &&    &  &   &       & & &       &&             & &&&&&&'
abcde=(a b c d e)
for((i=0; i<5; i++)); do
  eval echo -ne "\"\033[$(($[lines/2-6]+$i));$[cols/2-34]H\033[1;5;32m\$${abcde[i]}\033[0m\""
  sleep 0.1
done 

echo -ne "\033[$[lines/2];$[cols/2-3]H\(==)/"

i=1
col=$[cols/2-17]
while [[ $i -le 35 ]]; do
  echo -ne "\033[$[lines/2+1];${col}H\033[45m \e[0m"
  echo -ne "\033[$[lines/2+3];${col}H\033[45m \e[0m"
  sleep 0
  (( i+=1 ))
  (( col+=1 ))
done

strings="Made by LingYi"
col=$[cols/2-6]
for ((a=0;a<=${#strings}-1;a++)); do
  for((i=$[cols-2]; i>=$col; i--)); do
    echo -ne "\033[$[lines/2+2];${i}H\033[1;33m${strings:a:1}\033[0m"
    [[ $i -ne $col ]] && echo -ne "\033[$[lines/2+2];${i}H\033[1;$33m \033[0m"
  done  
  let col++
done

strings='Are You Ready ? [Y/N]'
col=$[cols/2-10]
for ((a=0;a<=${#strings}-1;a++)); do
  [[ $[RANDOM%2] -eq 0 ]] && {
    PrintChar2 "${strings:a:1}" 0 $[lines/2+4] $[lines/2+5] $col  31 upper left
  } || PrintChar2 "${strings:a:1}" 0 $[lines-2] $[lines/2+5] $col  31 low left 
  let col++
done

while :; do
  echo "ynq" | grep -q ${ch:-H} && {
    kill -10 ${DisFramePid} &>/dev/null
    break
  }
  echo -ne "\033[$[lines/2+5];$[cols/2-10]H\033[1;31mAre You Ready ? [Y/N]"
  read -s -n 1 ch
  ch=$(echo ${ch} | tr 'A-Z' 'a-z')
done

#======

[[ -z $ch ]] || [[ $ch == 'y' ]] && : || { clear; exit; }


check_invironment(){
  
  local n=0 m=0 q=0 i j k long 
  if [[ $((boundary_d-boundary_u)) -lt 24 ]]; then
    echo windows [ lines ] too small !
    exit
  fi
  for((i=0; i<${#expressions[@]}; i++))
  do 
    [[ ${#expressions[i]} -gt n ]] && n=${#expressions[i]}
  done
  for((j=0; j<${#strings[@]}; j++))
  do 
    [[ ${#strings[j]} -gt m ]] && m=${#strings[j]}
  done
  for((k=0; k<${#infors[@]}; k++))
  do  
    [[ ${#infors[k]} -gt q ]] && q=${#infors[k]}
  done
  [[ $((n+m)) -gt q ]] && long=$((n+m)) || long=$q
  [[ ${#gameover_string} -gt $long ]] && long=${#gameover_string}
  if [[ $((`tput cols`-boundary_r)) -le $((long+2)) ]]; then
    echo windows [ cols ] too small !
    exit
  fi
}

check_invironment

StopKeyboardInput=false
PauseMyTank=false

trap '' 2
trap 'game_over' 21

#pause and continue
trap 'PauseMyTank=true; kill -23 $run_enemytank_pid &>/dev/null' 25
trap 'PauseMyTank=false; kill -24 $run_enemytank_pid &>/dev/null' 26

sleep 0.5
clear
tput civis
    
#draw boundary
for((i=boundary_l-1; i<=boundary_r+1; i++))
do
  echo -ne "\033[${boundary_u};${i}H\033[${boundary_color}m "
  echo -ne "\033[${boundary_d};${i}H\033[${boundary_color}m "
done
for((i=boundary_u+1; i<boundary_d; i++))
do
  echo -ne "\033[${i};$((boundary_l-1))H\033[${boundary_color}m "
  echo -ne "\033[${i};${boundary_l}H\033[${boundary_color}m "
  echo -ne "\033[${i};${boundary_r}H\033[${boundary_color}m "
  echo -ne "\033[${i};$((boundary_r+1))H\033[${boundary_color}m "
done
echo -ne "\033[0m"
echo -ne "\033[$((boundary_u+0));$((boundary_r+3))H\033[1;${smallboundary_color}m---------"
echo -ne "\033[$((boundary_u+6));$((boundary_r+3))H\033[1;${smallboundary_color}m---------"
echo -ne "\033[$((boundary_u+1));$((boundary_r+3))H\033[1;${smallboundary_color}m|       |"
echo -ne "\033[$((boundary_u+2));$((boundary_r+3))H\033[1;${smallboundary_color}m|       |"
echo -ne "\033[$((boundary_u+3));$((boundary_r+3))H\033[1;${smallboundary_color}m|       |"
echo -ne "\033[$((boundary_u+4));$((boundary_r+3))H\033[1;${smallboundary_color}m|       |"
echo -ne "\033[$((boundary_u+5));$((boundary_r+3))H\033[1;${smallboundary_color}m|       |"
echo -ne "\033[0m"
echo -ne "\033[$((boundary_u+12));$((boundary_r+3))H\033[41m\033[33mState\033[0m  \033[1;34mrunning\033[0m"

$print_LingYi && {
  print_mywords &
  run_print_mywords_pid=$!
}

$print_infor && {
  print_infors &
  run_print_infors_pid=$!
}

$print_dtime && {
  print_dtime &
  run_print_dtime_pid=$!
}

$print_mode && {
  print_mode &
  run_print_mode_pid=$!
}

$print_roll && {
  print_roll_words &
  run_print_roll_words_pid=$!
}

#display enemy tank
DisplayRandTank

#display mytank
mytank_direct='u'
mytank_head=($[(boundary_d-boundary_u)/2+boundary_u] $[(boundary_r-boundary_l)/2+boundary_l])
HandleTank -d "${mytank_head[0]};${mytank_head[1]}" $mytank_direct my

#make enemy tank move
MoveEnemyTank &
run_enemytank_pid=$!
#MoveEnemyTank cann't get the value of $run_enemytank_pid, so record it in file.
echo $run_enemytank_pid >${tmpdir}/run_enemytank_pid 

#accept keyboard input
ESC=`echo -e '\033'`
stty -echo
while ! $StopKeyboardInput
do
  while $PauseMyTank
  do
    read -s -n 1 kk
    [[ $kk == 'c' ]] || [[ $kk == 'C' ]] && kill -26 $MYPID
  done
  read -s -n 1 key
  
  # this judging is necessary, to stop this loop.
  $StopKeyboardInput && break

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

  [[ $key == 'W' ]] && MoveMyTank u
  [[ $key == 'S' ]] && MoveMyTank d
  [[ $key == 'D' ]] && MoveMyTank r
  [[ $key == 'A' ]] && MoveMyTank l

      [[ $key == 'U' ]] && kill -28  $run_enemytank_pid
  [[ $key == 'L' ]] && kill -29  $run_enemytank_pid
  [[ $key == 'F' ]] && kill -37 $run_enemytank_pid 
  [[ $key == 'N' ]] && kill -38 $run_enemytank_pid && $print_mode && kill -25 $run_print_mode_pid
  [[ $key == 'M' ]] && kill -39 $run_enemytank_pid && $print_mode && kill -26 $run_print_mode_pid

  [[ $key == 'G' ]] && StealthMode
  [[ $key == 'V' ]] && GodMode
  
  [[ $key == 'P' ]] && kill -25 $MYPID
  [[ $key == 'Q' ]] && kill -21 $MYPID
  
  [[ -z $key ]] && Bullet  $mytank_direct ${mytank_head[@]} my &
  
  [[ $key == $ESC ]] && {
    for (( i=0; i<=1; i++ )); do read -s -n 1  KEY[$i]; done
    [[ ${KEY[0]} == '['   ]] && {
      [[ ${KEY[1]} == 'A' ]] &&  MoveMyTank u
      [[ ${KEY[1]} == 'B' ]] &&  MoveMyTank d
      [[ ${KEY[1]} == 'C' ]] &&  MoveMyTank r
      [[ ${KEY[1]} == 'D' ]] &&  MoveMyTank l
    }
  }
done 

stty echo
echo -e "\033[$((boundary_d+2));1H\033[0m"

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