参考了一位大佬的博客
https://blog.csdn.net/qq_40298054/article/details/84496944传送门
https://blog.csdn.net/qq_40818798/article/details/83758281
事情是这样的，原本愉快的一天因为一道题目而被毁掉
原题：
就很头疼（于是改成了输入三个坐标）
看一下成果：
代码如下：
data segment message db 'This is a sample program of keyboard and display' db 0dh,0ah,'Please strike the key!',0dh,0ah,'$' buf1 db 5 db ? db 5 dup('$') x1 dw ? y1 dw ? x2 dw ? y2 dw ? a1 dw 3 dup(?) b1 dw 3 dup(?) s2 dw ? s1 dw ? p dw ? xd dw ? yd dw ? area dw ? data ends code segment assume cs:code,ds:data ;------------------------------------------------------------------------------------------------------------------------------------------ main proc start: mov ax,data mov ds,ax mov dx,offset message ;dxhang,cxshu mov ah,9 int 21h mov al,12h ;320*200 256色的图形模式: mov ah,0 ;是用来设定显示模式的服务程序 int 10h xor di,di mov cx,3 loop0: push cx call cin mov a1[di],ax call cin mov b1[di],ax add di,2 pop cx loop loop0 call area1 xor di,di xor si,si mov ax,a1[0] mov bx,b1[0] mov x1,ax mov y1,bx mov ax,a1[2] mov bx,b1[2] mov x2,ax mov y2,bx add si,2 call chose mov ax,a1[0] mov bx,b1[0] mov x1,ax mov y1,bx mov ax,a1[4] mov bx,b1[4] mov x2,ax mov y2,bx add si,2 call chose mov ax,a1[2] mov bx,b1[2] mov x1,ax mov y1,bx mov ax,a1[4] mov bx,b1[4] mov x2,ax mov y2,bx add si,2 call chose xor si,si ; mov x1,100 ;(10,100) ; mov y1,250 ; mov x2,10 ;(100,250) ; mov y2,100 mov ah,4ch int 21h main endp ;------------------------------------------------------------------------------------------------------------------------------------------ row proc mov cx,x1 mov bx,x2 cmp cx,bx jb nextr xchg cx,bx nextr: mov dx,y1 ; mov cx,10 ;x坐标 ; mov bx,100 ;终止x坐标 ; mov dx,250 ;y坐标 int 10h pheng: mov al,1100b ;淡红色 mov ah,0ch ;写入点像 inc cx ; cmp cx,bx int 10h jne pheng ret row endp ;------------------------------------------------------------------------------------------------------------------------------------------ line proc mov dx,y1 mov bx,y2 cmp dx,bx jb nextl xchg dx,bx nextl: mov cx,x1 ; mov cx,10 ;x坐标 ; mov bx,250 ;终止y坐标 ; mov dx,100 ;y坐标 int 10h pshu: mov al,1100b ;淡红色 mov ah,0ch ;写入点像 inc dx ; cmp dx,bx int 10h jne pshu ret line endp ;------------------------------------------------------------------------------------------------------------------------------------------ ;------------------------------------------------------------------------------------------------------------------------------------------ paint proc call compare1 mov ax,x2 mov bx,x1 cmp ax,bx jae dpos1 sub bx,ax mov s1,-1 mov xd,bx jmp d1 dpos1: sub ax,bx mov s1,1 mov xd,ax d1: mov ax,y2 mov bx,y1 cmp ax,bx jae dpos2 ;y2>=y1 sub bx,ax ;y2<y1 mov s2,-1 mov yd,bx jmp d2 dpos2: sub ax,bx mov s2,1 mov yd,ax d2: add ax,ax mov bx,xd sub ax,bx mov p,ax ;2dy-dx mov cx,x1 mov dx,y1 pxie: mov al,1100b ;淡红色 mov ah,0ch ;写入点像 int 10h mov ax,p mov bx,0 cmp ax,bx jge ppos ;p>=0 jl pneg ;p<0 ppos: mov ax,xd mov bx,yd cmp ax,bx ja ddpos1 ;xd>yd jbe ddneg1 ;xd<=yd ddpos1: ;0<k<1 或者 -1<k<0 同时 p>=0 mov ax,x1 ;x=x+1 mov bx,s1 add ax,s1 mov x1,ax mov ax,s2 ;y=y+1 mov bx,y1 add bx,ax mov y1,bx mov ax,p ;Pn+1=Pn+2(dy-dx) mov bx,xd mov cx,yd add bx,bx add cx,cx sub cx,bx add ax,cx mov p,ax jmp plot ddneg1: ;k>1 或者 k<-1 同时 p>=0 mov ax,y1 ;y=y+1 inc ax mov y1,ax mov ax,s1 ;x=x+1 或者 x=x-1 mov bx,x1 add bx,ax mov x1,bx mov ax,p ;Pn+1=Pn+2(dx-dy) mov bx,xd mov cx,yd add bx,bx add cx,cx sub bx,cx add ax,bx mov p,ax jmp plot pxie1: jmp pxie pneg: mov ax,xd mov bx,yd cmp ax,bx ja ddpos2 ;xd>yd jbe ddneg2 ;xd<=yd ddpos2: ;0<k<1 或者 -1<k<0 同时 p<0 mov ax,x1 ;x=x+1 mov bx,s1 add ax,s1 mov x1,ax mov ax,p ;Pn+1=Pn+2dy mov bx,yd add bx,bx add ax,bx mov p,ax jmp plot ddneg2: ;k>1 或者 k<-1 同时 p<0 mov ax,y1 ;y=y+1 inc ax mov y1,ax mov ax,p ;Pn+1=Pn+2dx mov bx,xd add bx,bx add ax,bx mov p,ax jmp plot plot: mov cx,x1 ;X坐标 mov dx,y1 ;Y坐标 cmp cx,x2 ;是否绘图完毕 jne pxie1 ret paint endp ;------------------------------------------------------------------------------------------------------------------------------------------ ;------------------------------------------------------------------------------------------------------------------------------------------ ;compare0 proc ;trangle ; xor si,si ; mov ax,a1[] ; mov bx,a2 ; cmp ax,bx ; je test1 ; jmp test2 ;test1: ; mov ax,a1 ; mov bx,a3 ; cmp ax,bx ; je Utrangle ;test2: ; mov ax,b1 ; mov bx,b2 ; cmp ax,bx ; je text3 ; jmp exit ;test3: ; mov ax,b1 ; mov bx,b3 ; cmp ax,bx ; je text3 ; jmp exit ;Utrangle: ; mov ah,4ch ; int 21 ;exit: ; ret ;compare0 endp ;------------------------------------------------------------------------------------------------------------------------------------------ compare1 proc mov ax,y1 mov bx,y2 cmp ax,bx jna unch mov y1,bx mov y2,ax mov ax,x1 mov bx,x2 mov x1,bx mov x2,ax unch: ret compare1 endp ;------------------------------------------------------------------------------------------------------------------------------------------ cin proc xor cx,cx xor si,si again: mov dx,offset buf1 ;dxhang,cxshu mov ah,0ah int 21h mov cl,buf1[si+1] push cx change: mov al,buf1[si+2] and al,00001111b ;根据ascii，减去30h mov buf1[si+2],al inc si loop change sum: xor ax,ax mov si,2 pop cx loopc: mov bl,10 mul bl add al,buf1[si] inc si loop loopc push ax mov ah,02h ;回车换行 mov dl,0dh int 21h mov dl,0ah int 21h pop ax ret cin endp ;------------------------------------------------------------------------------------------------------------------------------------------ moving proc mov ax,a1[si] mov bx,b1[si] mov x1,ax mov y1,bx mov ax,a1[si] mov bx,b1[si] mov x1,ax mov y1,bx add si,2 ret moving endp ;------------------------------------------------------------------------------------------------------------------------------------------ chose proc mov ax,x1 cmp ax,x2 je line1 mov ax,y1 cmp ax,y2 je row1 call paint jmp exitc row1: call row jmp exitc line1: call line jmp exitc exitc: ret chose endp ;------------------------------------------------------------------------------------------------------------------------------------------ area1 proc ;2.S=1/2[(x1y2-x2y1)+(x2y3-x3y2)+(x3y1-x1y3)]65,536 mov ax,a1[0]; mov bx,b1[2]; mul bx mov area,ax mov ax,a1[2]; mov bx,b1[0]; mul bx sub area,ax mov ax,a1[2]; mov bx,b1[4]; mul bx add area,ax mov ax,a1[4]; mov bx,b1[2]; mul bx sub area,ax mov ax,a1[4]; mov bx,b1[0]; mul bx add area,ax mov ax,a1[0]; mov bx,b1[4]; mul bx sub area,ax mov ax,area cmp ax,8000h ;与0比较 jb to neg ax to: mov bx,2 div bx mov area,ax loopb1: xor dx,dx inc cl mov bx,10 div bx ;ax商,dx余 push dx ;余数入栈 cmp ax,0 jne loopb1 loopc1: pop dx or dl,00110000b mov ah,2 int 21h loop loopc1 ret area1 endp ;------------------------------------------------------------------------------------------------------------------------------------------ code ends end start ;1.p=1/2(a+b+c) s=gp(p-a)(p-b)(p-c) ;2.S=1/2[(x1y2-x2y1)+(x2y3-x3y2)+(x3y1-x1y3)]
还好，也就400来行。。。。