void graphDrawArrow (int c1, int l1, int c2, int l2) {
int m;
graphTest (l1, c1);
graphTest (l2, c2);
m = (l1 + l2) / 2;
while (l1 != m) { graph[l1][c1] = '|'; if (l1 < l2) l1++; else l1--; }
while (c1 != c2) { graph[l1][c1] = '-'; if (c1 < c2) c1++; else c1--; }
while (l1 != l2) { graph[l1][c1] = '|'; if (l1 < l2) l1++; else l1--; }
graph[l1][c1] = '|';
}
//在(c1, l1) (c2,l2)之间绘制一个连线
void graphDrawArrow (int c1, int l1, int c2, int l2) {
int m;
graphTest (l1, c1);
graphTest (l2, c2);
m = (l1 + l2) / 2; //中间行：用来绘制直线
while (l1 != m) { graph[l1][c1] = '|'; if (l1 < l2) l1++; else l1--; } //绘制上竖线
while (c1 != c2) { graph[l1][c1] = '-'; if (c1 < c2) c1++; else c1--; } //绘制横线
while (l1 != l2) { graph[l1][c1] = '|'; if (l1 < l2) l1++; else l1--; } //绘制下竖线
graph[l1][c1] = '|'; //最后竖线
}
void graphDrawBox (char *s, int c, int l) {
int i;
graphTest (l, c+strlen(s)-1+del);
for (i = 0; i < strlen (s); i++) {
graph[l][c+i+del] = s[i];
}
}