设置图形纵横比

[c]代码库

#include <graphics.h> 
#include <stdlib.h> 
#include <stdio.h> 
#include <conio.h> 

int main(void) 
{ 
   /* request auto detection */ 
   int gdriver = DETECT, gmode, errorcode; 
   int xasp, yasp, midx, midy; 

   /* 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; 
   setcolor(getmaxcolor()); 

   /* get current aspect ratio settings */ 
   getaspectratio(&xasp, &yasp); 

   /* draw normal circle */ 
   circle(midx, midy, 100); 
   getch(); 

   /* claer the screen */ 
   cleardevice(); 

   /* adjust the aspect for a wide circle */ 
   setaspectratio(xasp/2, yasp); 
   circle(midx, midy, 100); 
   getch(); 

   /* adjust the aspect for a narrow circle */ 
   cleardevice(); 
   setaspectratio(xasp, yasp/2); 
   circle(midx, midy, 100); 

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