[特效代码] BAT脚本实现分形图:龙形曲线

%1 @goto :initCON
@echo off & setlocal enabledelayedexpansion
call :clearVars
set /a "w=100,h=68, h1=h+0,t=w*h,xc=w/2+1,yc=h/2"

set "TAB=	" & for /F %%a in ('"prompt $h&for %%b in (1) do rem"')do Set "BS=%%a"
set /a "buffwid = w, linesWantBackAbove = h + 1 - 1, cntBS = 2 + (buffwid + 7) / 8 * linesWantBackAbove"
set "BSs=" & for /L %%a in (1 1 !cntBS!) do set "BSs=!BSs!%BS%"
set "aLineBS=" & for /L %%a in (1 1 !w!) do set "aLineBS=!aLineBS!%BS%"

mode %w%,%h1%

for /l %%i in (1 1 !t!) do set "s=!s! "
set "xv=-1" & set "yv=0 "

set "pttn=.@.@.@.@.@.@.@."
REM 画出初始曲线段
set /a "x=xinit=28, y=yinit=-10, length=1, len2=(length-1) * 2"
set /a "i=x-xc + (y-yc) * w + 1, L=i-1"
for /f "tokens=1,2" %%a in ("!L! !i!") do (set s=!s:~0,%%a!!pttn:~0,1!!s:~%%b!)
for /L %%L in (0 2 !len2!) do (
    set /a "x += !xv:~%%L,2!, y += !yv:~%%L,2!"
    set /a "i=x-xc + (y-yc) * w + 1, L=i-1"
    for /f "tokens=1,2" %%a in ("!L! !i!") do (set s=!s:~0,%%a!!pttn:~0,1!!s:~%%b!)
)
set "pttn=!pttn:~1!"
call :f !xinit! !yinit! !length! s xv yv
title complete & >nul pause &exit
:f xtail ytail length s xv yv
REM setlocal

    if %3 lss 4096 (

        set "vxr=" & set "vyr="

        set /a "x=%1, y=%2, len2=(%3 - 1) * 2, nextLength=%3 * 2"
        for /L %%L in (0 2 !len2!) do (
            set /a "xn = - !yv:~%%L,2!, yn = !xv:~%%L,2!"
            
            set /a "x += -xn, y += -yn" & rem xn,yn 得到顺时针90旋转 取反的值
            set /a "i=x-xc + (y-yc) * w + 1, L=i-1, inScr=(x-(-w/2+1)^x-(w/2+1))&(y-(-h/2+1)^y-(h/2+1))"
            if !inScr! lss 0 (
                for /f "tokens=1,2" %%a in ("!L! !i!") do (set s=!s:~0,%%a!!pttn:~0,1!!s:~%%b!)

                <nul set /p "=!aLineBS!" & (2>nul echo;%TAB%!BSs!) & <nul set /p "=%BS%"
                <nul set /p "=%BS%!s:~0,-1!"
            )

            set "xn=  !xn!" & set "yn=  !yn!"
            set "vxr=!xn:~-2!!vxr!" & set "vyr=!yn:~-2!!vyr!"
        )
        set "pttn=!pttn:~1!"

        set "xv=!vxr!!xv!" & set "yv=!vyr!!yv!"

        call :f !x! !y! !nextLength! %4 %5 %6
    )

exit /b

:initCON
@echo off
for %%a in (  FontSize:00080008      FontFamily:00000030  WindowSize:00C800C8
              ScreenColors:0000000f  CodePage:000001b5    ScreenBufferSize:00C800C8
) do for /f "tokens=1,2 delims=:" %%b in ("%%a") do (
  >nul reg add HKCU\Console\Dragon_curve /v %%b /t reg_dword /d 0x%%c /f
)
start "Dragon_curve" /max "%ComSpec%" /c "%~0" REM & (call :delReg) & exit
REM end of :initCON
exit /b
:clearVars
set "Path=%SystemRoot%\system32"
for /f "delims==" %%a in ('set') do (
  if /i "%%a" neq "Path" set "%%a="
)
exit /b
REM end of :clearVars
:delReg
setlocal enabledelayedexpansion
set "s=!time:~-4,1!"
:delReg.loop
set /a "elapse = (1!time:~-4,1! - s) %% 10"
if %elapse% lss 2 goto :delReg.loop
>nul reg delete HKCU\Console\Dragon_curve /f
endlocal
exit /b
REM end of :delReg
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