俄罗斯方块——shell

 #!/bin/bash

 # Tetris Game
 # 10.21. xhchen<[email]xhchen@winbond.com.tw[/email]>

 #APP declaration
 APP_NAME="${0##*[\\/]}"
 APP_VERSION="1.0"

 #颜色定义
 cRed=
 cGreen=
 cYellow=
 cBlue=
 cFuchsia=
 cCyan=
 cWhite=
 colorTable=($cRed $cGreen $cYellow $cBlue $cFuchsia $cCyan $cWhite)

 #位置和大小
 iLeft=
 iTop=
 ((iTrayLeft = iLeft + ))
 ((iTrayTop = iTop + ))
 ((iTrayWidth = ))
 ((iTrayHeight = ))

 #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=
 sigLeft=
 sigRight=
 sigDown=
 sigAllDown=
 sigExit=

 #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=(       )
 box1=(               )
 box2=(               )
 box3=(               )
 box4=(                               )
 box5=(                               )
 box6=(                               )
 #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=(      )
 #各种方块再box数组中的偏移
 offsetBox=(      )

 #每提高一个速度级需要积累的分数
 iScoreEachLevel=        #be greater than 

 #运行时数据
 sig=                #接收到的signal
 iScore=        #总分
 iLevel=        #速度级
 boxNew=()        #新下落的方块的位置定义
 cBoxNew=        #新下落的方块的颜色
 iBoxNewType=        #新下落的方块的种类
 iBoxNewRotate=        #新下落的方块的旋转角度
 boxCur=()        #当前方块的位置定义
 cBoxCur=        #当前方块的颜色
 iBoxCurType=        #当前方块的种类
 iBoxCurRotate=        #当前方块的旋转角度
 boxCurX=-        #当前方块的x坐标位置
 boxCurY=-        #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-, 表示没有方块
 for ((i = ; i < iTrayHeight * iTrayWidth; i++)); do iMap[$i]=-; done

 #接收输入的进程的主函数
 function RunAsKeyReceiver()
 {
         local pidDisplayer key aKey sig cESC sTTY

         pidDisplayer=$
         aKey=(  )

         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  key

                 aKey[]=${aKey[]}
                 aKey[]=${aKey[]}
                 aKey[]=$key
                 sig=

                 #判断输入了何种键
                 if [[ $key == $cESC && ${aKey[]} == $cESC ]]
                 then
                         #ESC键
                         MyExit
                 elif [[ ${aKey[]} == $cESC && ${aKey[]} == "[" ]]
                 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 [[ $sig !=  ]]
                 then
                         #向另一进程发送消息
                         kill -$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 + ))

         #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 = ; i <  - iLevel; i++))
                 do
                         sleep 0.02
                         sigThis=$sig
                         sig=

                         #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=$
         xTest=$
         for ((j = ; j < ; j += ))
         do
                 ((i = j + ))
                 ((y = ${boxCur[$j]} + yTest))
                 ((x = ${boxCur[$i]} + xTest))
                 if (( y <  || y >= iTrayHeight || x <  || x >= iTrayWidth))
                 then
                         #撞到墙壁了
                         return
                 fi
                 if ((${iMap[y * iTrayWidth + x]} != - ))
                 then
                         #撞到其他已经存在的方块了
                         return
                 fi
         done
         return ;
 }

 #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 = ; j < ; j += ))
         do
                 ((i = j + ))
                 ((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=
         for ((j = ; j < iTrayWidth * iTrayHeight; j += iTrayWidth))
         do
                 for ((i = j + iTrayWidth - ; i >= j; i--))
                 do
                         if ((${iMap[$i]} == -)); then break; fi
                 done
                 if ((i >= j)); then continue; fi

                 ((line++))
                 for ((i = j - ; i >= ; i--))
                 do
                         ((x = i + iTrayWidth))
                         iMap[$x]=${iMap[$i]}
                 done
                 for ((i = ; i < iTrayWidth; i++))
                 do
                         iMap[$i]=-
                 done
         done

         if ((line == )); then return; fi

         #根据消去的行数line计算分数和速度级
         ((x = iLeft + iTrayWidth *  + ))
         ((y = iTop + ))
         ((iScore += line *  - ))
         #显示新的分数
         echo -ne "\033[1m\033[3${cScoreValue}m\033[${y};${x}H${iScore}         "
         if ((iScore % iScoreEachLevel < line *  - ))
         then
                 if ((iLevel < ))
                 then
                         ((iLevel++))
                         ((y = iTop + ))
                         #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 = ; y < iTrayHeight; y++))
         do
                 ((yp = y + iTrayTop + ))
                 ((xp = iTrayLeft + ))
                 ((i = y * iTrayWidth))
                 echo -ne "\033[${yp};${xp}H"
                 for ((x = ; x < iTrayWidth; x++))
                 do
                         ((j = i + x))
                         if ((${iMap[$j]} == -))
                         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 + ))        #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 - ))
         if BoxMove $boxCurY $x
         then
                 s=`DrawCurBox `
                 ((boxCurX = x))
                 s=$s`DrawCurBox `
                 echo -ne $s
         fi
 }

 #右移一列
 function BoxRight()
 {
         local x s
         ((x = boxCurX + ))
         if BoxMove $boxCurY $x
         then
                 s=`DrawCurBox `
                 ((boxCurX = x))
                 s=$s`DrawCurBox `
                 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 = ; j < ; j += ))
         do
                 ((i = j + ))
                 ((y = ${boxCur[$j]} + boxCurY))
                 ((x = ${boxCur[$i]} + boxCurX))
                 for ((k = y + ; k < iTrayHeight; k++))
                 do
                         ((i = k * iTrayWidth + x))
                         if (( ${iMap[$i]} != -)); then break; fi
                 done
                 ((k -= y + ))
                 if (( $iDown > $k )); then iDown=$k; fi
         done

         s=`DrawCurBox `        #将旧的方块抹去
         ((boxCurY += iDown))
         s=$s`DrawCurBox `        #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 + ))
         if ((iTestRotate >= iCount))
         then
                 ((iTestRotate = ))
         fi

         #更新到新的样式, 保存老的样式(但不显示)
         for ((j = , i = (${offsetBox[$iBoxCurType]} + $iTestRotate) * ; j < ; j++, i++))
         do
                 boxTest[$j]=${boxCur[$j]}
                 boxCur[$j]=${box[$i]}
         done

         if BoxMove $boxCurY $boxCurX        #测试旋转后是否有空间放的下
         then
                 #抹去旧的方块
                 for ((j = ; j < ; j++))
                 do
                         boxCur[$j]=${boxTest[$j]}
                 done
                 s=`DrawCurBox `

                 #画上新的方块
                 for ((j = , i = (${offsetBox[$iBoxCurType]} + $iTestRotate) * ; j < ; j++, i++))
                 do
                         boxCur[$j]=${box[$i]}
                 done
                 s=$s`DrawCurBox `
                 echo -ne $s
                 iBoxCurRotate=$iTestRotate
         else
                 #不能旋转，还是继续使用老的样式
                 for ((j = ; j < ; 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=$

         s=""
         if (( bDraw ==  ))
         then
                 sBox="\040\040"
         else
                 sBox="[]"
                 s=$s"\033[1m\033[7m\033[3${cBoxCur}m\033[4${cBoxCur}m"
         fi

         for ((j = ; j < ; j += ))
         do
                 ((i = iTrayTop +  + ${boxCur[$j]} + boxCurY))
                 ((t = iTrayLeft +  +  * (boxCurX + ${boxCur[$j + ]})))
                 #\[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 = ; j < ${#boxNew[@]}; j++))
         do
                 boxCur[$j]=${boxNew[$j]}
         done

         #显示当前移动的方块
         if (( ${#boxCur[@]} ==  ))
         then
                 #计算当前方块该从顶端哪一行"冒"出来
                 for ((j = , t = ; j < ; j += ))
                 do
                         if ((${boxCur[$j]} < t)); then t=${boxCur[$j]}; fi
                 done
                 ((boxCurY = -t))
                 for ((j = , i = -, t = ; j < ; j += ))
                 do
                         if ((${boxCur[$j]} > i)); then i=${boxCur[$j]}; fi
                         if ((${boxCur[$j]} < t)); then t=${boxCur[$j]}; fi
                 done
                 ((boxCurX = (iTrayWidth -  - i - t) / ))

                 #显示当前移动的方块
                 echo -ne `DrawCurBox `

                 #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 = ; j < ; j++))
         do
                 ((i = iTop +  + j))
                 ((t = iLeft +  * iTrayWidth + ))
                 echo -ne "\033[${i};${t}H        "
         done

         #随机产生新的方块
         ((iBoxNewType = RANDOM % ${#offsetBox[@]}))
         ((iBoxNewRotate = RANDOM % ${countBox[$iBoxNewType]}))
         for ((j = , i = (${offsetBox[$iBoxNewType]} + $iBoxNewRotate) * ; j < ; j++, i++))
         do
                 boxNew[$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 = ; j < ; j += ))
         do
                 ((i = iTop +  + ${boxNew[$j]}))
                 ((t = iLeft +  * iTrayWidth +  +  * ${boxNew[$j + ]}))
                 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 + ))
         ((t3 = iLeft + iTrayWidth *  + ))
         for ((i = ; i < iTrayHeight; i++))
         do
                 ((t1 = i + iTop + ))
                 echo -ne "\033[${t1};${t2}H||"
                 echo -ne "\033[${t1};${t3}H||"
         done

         ((t2 = iTop + iTrayHeight + ))
         for ((i = ; i < iTrayWidth + ; i++))
         do
                 ((t1 = i *  + iLeft + ))
                 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 *  + ))
         ((t2 = iTop + ))
         echo -ne "\033[3${cScore}m\033[${t2};${t1}HScore"
         ((t2 = iTop + ))
         echo -ne "\033[3${cScoreValue}m\033[${t2};${t1}H${iScore}"
         ((t2 = iTop + ))
         echo -ne "\033[3${cScore}m\033[${t2};${t1}HLevel"
         ((t2 = iTop + ))
         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 + ))
         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 $ --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