函数名: floodfill 
 功  能: 填充一个有界区域 
 用  法: #include <graphics.h> 
         void far floodfill(int x, int y, int border); 
 程序例: 
#include <graphics.h> 
 #include <stdlib.h> 
 #include <stdio.h> 
 #include <conio.h> 
int main(void) 
 { 
    /* request auto detection */ 
    int gdriver = DETECT, gmode, errorcode; 
    int maxx, maxy; 
   /* initialize graphics, 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 */ 
    } 
   maxx = getmaxx(); 
    maxy = getmaxy(); 
   /* select drawing color */ 
    setcolor(getmaxcolor()); 
   /* select fill color */ 
    setfillstyle(SOLID_FILL, getmaxcolor()); 
   /* draw a border around the screen */ 
    rectangle(0, 0, maxx, maxy); 
   /* draw some circles */ 
    circle(maxx / 3, maxy /2, 50); 
    circle(maxx / 2, 20, 100); 
    circle(maxx-20, maxy-50, 75); 
    circle(20, maxy-20, 25); 
   /* wait for a key */ 
    getch(); 
   /* fill in bounded region */ 
    floodfill(2, 2, getmaxcolor()); 
   /* clean up */ 
    getch(); 
    closegraph(); 
    return 0; 
 }