C语言函数—registerbgidriver

函数名

rectangle

功 能

画一个矩形

用 法

void far rectangle(int left, int top, int right, int bottom);

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 left, top, right, bottom; 

   /* initialize graphics and local variables */ 
   initgraph(&gdriver, &gmode, ""); 

   /* read result of initialization */ 
   errorcode = graphresult(); 
   if (errorcode != grOk)  /* an error occurred */ 
   { 
      printf("Graphics error: %sn", grapherrormsg(errorcode)); 
      printf("Press any key to halt:"); 
      getch(); 
      exit(1); /* terminate with an error code */ 
   } 

   left = getmaxx() / 2 - 50; 
   top = getmaxy() / 2 - 50; 
   right = getmaxx() / 2 + 50; 
   bottom = getmaxy() / 2 + 50; 

   /* draw a rectangle */ 
   rectangle(left,top,right,bottom); 

   /* clean up */ 
   getch(); 
   closegraph(); 
   return 0; 
} 
  
  

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