函数名: setlinestyle 
 功  能: 设置当前画线宽度和类型 
 用  法: #include <graphics.h> 
         void far setlinestyle(int linestype, unsigned upattern); 
 程序例: 
#include <graphics.h> 
 #include <stdlib.h> 
 #include <string.h> 
 #include <stdio.h> 
 #include <conio.h> 
/* the names of the line styles supported */ 
 char *lname[] = { 
    "SOLID_LINE", 
    "DOTTED_LINE", 
    "CENTER_LINE", 
    "DASHED_LINE", 
    "USERBIT_LINE" 
    }; 
int main(void) 
 { 
    /* request auto detection */ 
    int gdriver = DETECT, gmode, errorcode; 
   int style, midx, midy, userpat; 
    char stylestr[40]; 
   /* initialize graphics and local variables */ 
    initgraph(&gdriver, &gmode, ""); 
   /* read result of initialization */ 
    errorcode = graphresult(); 
    if (errorcode != grOk)  /* an error occurred */ 
    { 
       printf("Graphics error: %s\n", grapherrormsg(errorcode)); 
       printf("Press any key to halt:"); 
       getch(); 
       exit(1); /* terminate with an error code */ 
    } 
   midx = getmaxx() / 2; 
    midy = getmaxy() / 2; 
   /* a user defined line pattern */ 
    /* binary: "0000000000000001"  */ 
    userpat = 1; 
   for (style=SOLID_LINE; style<=USERBIT_LINE; style++) 
    { 
       /* select the line style */ 
       setlinestyle(style, userpat, 1); 
      /* convert style into a string */ 
       strcpy(stylestr, lname[style]); 
      /* draw a line */ 
       line(0, 0, midx-10, midy); 
      /* draw a rectangle */ 
       rectangle(0, 0, getmaxx(), getmaxy()); 
      /* output a message */ 
       outtextxy(midx, midy, stylestr); 
      /* wait for a key */ 
       getch(); 
       cleardevice(); 
    } 
   /* clean up */ 
    closegraph(); 
    return 0; 
 }