制作一款打飞机游戏28：编辑器完善鲁棒性

精灵编辑器现状

我们现在有了一个精灵编辑器，它基本上能正常工作，但还有一些小细节我不太满意，想要进行修复。

修复滚动问题

首先，我发现一个问题是，在切换模式时，滚动位置没有重置。这会导致菜单在切换后滚动到奇怪的位置。我打算在更新函数中解决这个问题，确保在切换到编辑模式时，将滚动X和滚动Y都重置为0。同样，在返回列表视图时也要进行重置。

解决内存溢出问题

接下来，我发现了一个可能导致内存溢出的简单错误。当我们在设置精灵链时，如果精灵之间相互引用形成闭环，就会导致无限循环，从而耗尽内存。为了解决这个问题，我打算创建一个包装函数来验证精灵链，确保不会出现闭环。同时，我还会增加一个最大深度限制，以防止递归调用过深。

处理空值问题

在编辑精灵时，如果选择了空值（nil），我们不应该尝试绘制它，而应该显示一个有意义的消息。我打算在绘制函数中添加检查，如果精灵为空，则打印一条消息而不是尝试绘制。

填充数组空隙

另一个问题是，当我们在数组中间删除精灵时，会留下空隙。这会影响我们的导出函数。为了解决这个问题，我打算在删除精灵时，检查并填充这些空隙。

添加删除功能

最后，我想在编辑器中添加一个删除精灵的功能。这很简单，只需在菜单中添加一个“删除”选项，并在选择时执行删除操作即可。

pico-8 cartridge // http://www.pico-8.com
version 41
__lua__
function _init()--- customize here ---#include shmup_myspr.txtfile="shmup_myspr.txt"arrname="myspr"data=mysprreload(0x0,0x0,0x2000,"cowshmup.p8")----------------------debug={}msg={}_drw=draw_list_upd=update_listmenuitem(1,"export",export)curx=1cury=1scrolly=0scrollx=0poke(0x5f2d, 1)
endfunction _draw()_drw()if #msg>0 thenbgprint(msg[1].txt,64-#msg[1].txt*2,80,14)msg[1].t-=1if msg[1].t<=0 thendeli(msg,1)end  end-- debug --cursor(4,4)color(8)for txt in all(debug) doprint(txt)end
endfunction _update60()dokeys()mscroll=stat(36)_upd()
endfunction dokeys()if stat(30) thenkey=stat(31)if key=="p" thenpoke(0x5f30,1)endelsekey=nilendend
-->8
--draw
function draw_edit()-- backgroundfillp(0b11001100001100111100110000110011)rectfill(0,0,127,127,33)fillp(▒)line(63,0,63,127,13)line(0,63,127,63,13)fillp()draw_menu()-- draw spriteif selspr thenwrapmspr(selspr,63,63)end-- blinking dotif (time()*2)%1<0.5 thenpset(63,63,rnd({8,13,7,15}))end
endfunction draw_list()fillp(0b11001100001100111100110000110011)rectfill(0,0,127,127,33)fillp(▒)line(63,0,63,127,13)line(0,63,127,63,13)fillp()draw_menu()-- draw spritelocal mymnu=menu[cury][curx]if mymnu thenwrapmspr(mymnu.cmdy,63,63)endif (time()*2)%1<0.5 thenpset(63,63,rnd({8,13,7,15}))end
endfunction draw_table()cls(2)draw_menu()
endfunction draw_menu()--spr(0,0,0,16,16)if menu thenfor i=1,#menu dofor j=1,#menu[i] dolocal mymnu=menu[i][j]local c=mymnu.c or 13if i==cury and j==curx thenc=7if _upd==upd_type thenc=0endendbgprint(mymnu.w,mymnu.x+scrollx,mymnu.y+scrolly,13)   bgprint(mymnu.txt,mymnu.x+scrollx,mymnu.y+scrolly,c) endendendif _upd==upd_type thenlocal mymnu=menu[cury][curx]local txt_bef=sub(typetxt,1,typecur-1)local txt_cur=sub(typetxt,typecur,typecur)local txt_aft=sub(typetxt,typecur+1)txt_cur=txt_cur=="" and " " or txt_cur if (time()*2)%1<0.5 thentxt_cur="\^i"..txt_cur.."\^-i"endlocal txt=txt_bef..txt_cur..txt_aftbgprint(txt,mymnu.x+scrollx,mymnu.y+scrolly,7)endend-->8
--update
function update_edit()refresh_edit()if btnp(⬆️) thencury-=1endif btnp(⬇️) thencury+=1endcury=(cury-1)%#menu+1cury-=mscrollcury=mid(1,cury,#menu)if cury==1 thencurx=1if btnp(⬅️) thenselspr-=1elseif btnp(➡️) thenselspr+=1endselspr=mid(1,selspr,#data)	elseif cury==10 thencurx=1elsecurx=2endif btnp(🅾️) then_drw=draw_list_upd=update_listrefresh_list()cury=selsprcurx=1scrolly=0scrollx=0returnendif btnp(❎) thenlocal mymnu=menu[cury][curx]if mymnu.cmd=="editval" then_upd=upd_typelocal s=tostr(data[mymnu.cmdy][mymnu.cmdx])if s=="[nil]" or s==nil thens=""endtypetxt=stypecur=#typetxt+1typecall=enter_editelseif mymnu.cmd=="delspr" thendeli(data,selspr)selspr-=1if selspr==0 thenselspr=1end_drw=draw_list_upd=update_listrefresh_list()cury=selsprcurx=1scrolly=0scrollx=0return   endend
endfunction update_list()refresh_list()if btnp(⬆️) thencury-=1endif btnp(⬇️) thencury+=1endcury=(cury-1)%#menu+1cury-=mscrollcury=mid(1,cury,#menu)curx=1local mymnu=menu[cury][curx]if mymnu.y+scrolly>110 thenscrolly-=4endif mymnu.y+scrolly<10 thenscrolly+=4endscrolly=min(0,scrolly)if mymnu.x+scrollx>110 thenscrollx-=2endif mymnu.x+scrollx<20 thenscrollx+=2endscrollx=min(0,scrollx)if btnp(❎) thenlocal mymnu=menu[cury][curx]if mymnu.cmd=="newline" thenadd(data,{0,0,0,0,0,0})elseif mymnu.cmd=="editspr" thenselspr=mymnu.cmdy_upd=update_edit_drw=draw_editscrolly=0scrollx=0refresh_edit()cury=1endend
endfunction update_table()refresh_table()if btnp(⬆️) thencury-=1endif btnp(⬇️) thencury+=1endcury=(cury-1)%#menu+1cury-=mscrollcury=mid(1,cury,#menu)if btnp(⬅️) thencurx-=1endif btnp(➡️) thencurx+=1endif cury<#menu thencurx=(curx-2)%(#menu[cury]-1)+2elsecurx=1endlocal mymnu=menu[cury][curx]if mymnu.y+scrolly>110 thenscrolly-=4endif mymnu.y+scrolly<10 thenscrolly+=4endscrolly=min(0,scrolly)if mymnu.x+scrollx>110 thenscrollx-=2endif mymnu.x+scrollx<20 thenscrollx+=2endscrollx=min(0,scrollx)if btnp(❎) thenlocal mymnu=menu[cury][curx]if mymnu.cmd=="edit" then_upd=upd_typetypetxt=tostr(mymnu.txt)typecur=#typetxt+1typecall=enter_tableelseif mymnu.cmd=="newline" thenadd(data,{0})  elseif mymnu.cmd=="newcell" thenadd(data[mymnu.cmdy],0)endend
endfunction upd_type()if key thenif key=="\r" then-- enter   poke(0x5f30,1)typecall()returnelseif key=="\b" then--backspaceif typecur>1 thenif typecur>#typetxt thentypetxt=sub(typetxt,1,#typetxt-1)elselocal txt_bef=sub(typetxt,1,typecur-2)local txt_aft=sub(typetxt,typecur)typetxt=txt_bef..txt_aftendtypecur-=1endelseif typecur>#typetxt thentypetxt..=keyelselocal txt_bef=sub(typetxt,1,typecur-1)local txt_aft=sub(typetxt,typecur)typetxt=txt_bef..key..txt_aftendtypecur+=1endendif btnp(⬅️) thentypecur-=1endif btnp(➡️) thentypecur+=1endtypecur=mid(1,typecur,#typetxt+1)
end
-->8
--toolsfunction bgprint(txt,x,y,c)print("\#0"..txt,x,y,c)
endfunction split2d(s)local arr=split(s,"|",false)for k, v in pairs(arr) doarr[k] = split(v)endreturn arr
endfunction wrapmspr(si,sx,sy)if si==nil thenbgprint("[nil]",sx-5*2+1,sy-2,14)returnendif myspr[si]==nil thenbgprint("["..si.."]",sx-5*2+1,sy-2,14)returnendlocal ms=myspr[si]if ms[8] then--check for loopsif ms[8]==si thenbgprint("[loop]",sx-6*2+1,sy-2,14)returnelseif checkloop(ms,10) thenbgprint("[loop]",sx-6*2+1,sy-2,14)return   endendendmspr(si,sx,sy)
endfunction checkloop(ms,depth)depth-=1if depth<=0 thenreturn trueendif ms==nil thenreturn trueendif ms[8] thenreturn checkloop(myspr[ms[8]],depth)elsereturn falseend
endfunction mspr(si,sx,sy)local ms=myspr[si]sspr(ms[1],ms[2],ms[3],ms[4],sx-ms[5],sy-ms[6],ms[3],ms[4],ms[7]==1)if ms[7]==2 thensspr(ms[1],ms[2],ms[3],ms[4],sx-ms[5]+ms[3],sy-ms[6],ms[3],ms[4],true)endif ms[8] thenmspr(ms[8],sx,sy)end
endfunction spacejam(n)local ret=""for i=1,n doret..=" "endreturn ret
end
-->8
--i/o
function export()local s=arrname.."=split2d\""for i=1,#data doif i>1 thens..="|"endfor j=1,#data[i] doif j>1 thens..=","ends..=data[i][j]endends..="\""printh(s,file,true)add(msg,{txt="exported!",t=120})--debug[1]="exported!"
end
-->8
--ui
function refresh_edit()menu={}add(menu,{{txt="< sprite "..selspr.." >",w="",cmd="sprhead",x=2,y=2}})local lab={"  x:","  y:","wid:","hgt:"," ox:"," oy:"," fx:","nxt:"}for i=1,8 dolocal s=tostr(data[selspr][i])if s==nil thens="[nil]"endadd(menu,{{txt=lab[i],w="    ",x=2,y=3+i*7},{txt=s,w=spacejam(#s),cmd="editval",cmdy=selspr,cmdx=i,x=2+16,y=3+i*7}}) endadd(menu,{{txt="delete",w="",cmd="delspr",x=2,y=4+9*7}})
endfunction refresh_list()menu={}for i=1,#data dolocal lne={}local linemax=#data[i]if i==cury thenlinemax+=1  endadd(lne,{txt="spr "..i,w="",cmd="editspr",cmdy=i,x=2,y=-4+6*i})add(menu,lne)endadd(menu,{{txt=" + ",w="   ",cmd="newline",x=2,y=-4+6*(#data+1)+2, }})
endfunction refresh_table()menu={}for i=1,#data dolocal lne={}local linemax=#data[i]if i==cury thenlinemax+=1  endadd(lne,{txt=i,w="   ",cmd="",x=4,y=-4+8*i,c=2  })for j=1,linemax doif j==#data[i]+1 thenadd(lne,{txt="+",w=" ",cmd="newcell",cmdy=i,x=-10+14*(j+1),y=-4+8*i, })elseadd(lne,{txt=data[i][j],cmd="edit",cmdx=j,cmdy=i,x=-10+14*(j+1),y=-4+8*i,w="   "})endendadd(menu,lne)endadd(menu,{{txt=" + ",w="   ",cmd="newline",x=4,y=-4+8*(#data+1), }})
endfunction enter_table()local mymnu=menu[cury][curx]local typeval=tonum(typetxt)if typeval==nil thenif mymnu.cmdx==#data[mymnu.cmdy] and typetxt=="" then--delete celldeli(data[mymnu.cmdy],mymnu.cmdx)if mymnu.cmdx==1 thendeli(data,mymnu.cmdy)end_upd=update_tablereturnend  typeval=0enddata[mymnu.cmdy][mymnu.cmdx]=typeval_upd=update_tablerefresh_table()
endfunction enter_edit()local mymnu=menu[cury][curx]local typeval=tonum(typetxt)if mymnu.cmdx==8 thenif typeval!=nil thenif data[mymnu.cmdy][7]==nil thendata[mymnu.cmdy][7]=0endendendif typeval==nil thenif mymnu.cmdx>=7 and mymnu.cmdx==#data[mymnu.cmdy] thendeli(data[mymnu.cmdy],mymnu.cmdx)elsedata[mymnu.cmdy][mymnu.cmdx]=0endelsedata[mymnu.cmdy][mymnu.cmdx]=typevalend _upd=update_editrefresh_edit()
end
__gfx__
00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
00700700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
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00077000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
00700700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
__map__
0000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000