用字符生成绘画到txt的简单c语言小程序
有很多上古时期的文档都是txt格式的，而其中很多内嵌了用字符画出来的图表。
例如 rfc 793 中的TCP状态机：
+---------+ ---------\ active OPEN
| CLOSED | \ -----------
+---------+<---------\ \ create TCB
| ^ \ \ snd SYN
passive OPEN | | CLOSE \ \
------------ | | ---------- \ \
create TCB | | delete TCB \ \
V | \ \
+---------+ CLOSE | \
| LISTEN | ---------- | |
+---------+ delete TCB | |
rcv SYN | | SEND | |
----------- | | ------- | V
+---------+ snd SYN,ACK / \ snd SYN +---------+
| |<----------------- ------------------>| |
| SYN | rcv SYN | SYN |
| RCVD |<-----------------------------------------------| SENT |
| | snd ACK | |
| |------------------ -------------------| |
+---------+ rcv ACK of SYN \ / rcv SYN,ACK +---------+
| -------------- | | -----------
| x | | snd ACK
| V V
| CLOSE +---------+
| ------- | ESTAB |
| snd FIN +---------+
| CLOSE | | rcv FIN
V ------- | | -------
+---------+ snd FIN / \ snd ACK +---------+
| FIN |<----------------- ------------------>| CLOSE |
| WAIT-1 |------------------ | WAIT |
+---------+ rcv FIN \ +---------+
| rcv ACK of FIN ------- | CLOSE |
| -------------- snd ACK | ------- |
V x V snd FIN V
+---------+ +---------+ +---------+
|FINWAIT-2| | CLOSING | | LAST-ACK|
+---------+ +---------+ +---------+
| rcv ACK of FIN | rcv ACK of FIN |
| rcv FIN -------------- | Timeout=2MSL -------------- |
| ------- x V ------------ x V
\ snd ACK +---------+delete TCB +---------+
------------------------>|TIME WAIT|------------------>| CLOSED |
+---------+ +---------+
TCP Connection State Diagram
Figure 6.
如果这些字符画用记事本来直接绘制则非常麻烦，于是我就用c语言写了个非常简陋小程序来帮助绘制字符画。
用法如下：
i x y d //在[x][y]点插入字符 ‘d’
h x y1 y2 d // 在[x][y1]到[x][y2]一横行之间插入字符’d’
s x1 y x2 d // 在[x1][y]到[x2][y]一竖行之间插入字符’d’
o //将字符画保存到out.txt文件中
p //将字符画绘制在控制台上
源代码：
#include<bits/stdc++.h>
using namespace std;
char a[100][100];
int main(){
for(int i=0;i<50;i++){
for(int j=0;j<50;j++){
a[i][j]=' ';
}
}
while(1){
cout<<" |";
for(int i=0;i<50;i++){
cout<<i;
if(i<10){
cout<<" ";
}
cout<<"|" ;
}
cout<<endl;
for(int i=0;i<50;i++){
for(int j=0;j<152;j++){
cout<<"-";
}cout<<endl;
cout<<i;
if(i<10)cout<<" ";
cout<<"|";
for(int j=0;j<50;j++){
cout<<a[i][j];
cout<<" "; cout<<"|";
}cout<<endl;
}
char c,d;
while(cin>>c){
if(c=='i'){
int x,y;
cin>>x>>y>>d;
a[x][y]=d;
}else if(c=='h'){
int x,y1,y2;
cin>>x>>y1>>y2>>d;
for(int i=y1;i<=y2;i++){
a[x][i]=d;
}
} else if (c=='s'){
int x1,x2,y;
cin>>x1>>y>>x2>>d;
for(int i=x1;i<=x2;i++){
a[i][y]=d;
}
}else if(c=='o'){
freopen("out.txt","w",stdout);
for(int i=0;i<50;i++){
for(int j=0;j<50;j++){
cout<<a[i][j];
}cout<<endl;
}
freopen("CON", "w", stdout);
} else if(c=='p'){
break;
}
}
} }例如
输入
h 7 7 37 -
h 27 7 37 -
s 7 7 27 |
s 7 37 27 |
p
则会画出一个长方形
显示如下：
|0 |1 |2 |3 |4 |5 |6 |7 |8 |9 |10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31|32|33|34|35|36|37|38|39|40|41|42|43|44|45|46|47|48|49|
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再输入o，则会输出out.txt中：
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