getaspectratio

Retrieves the current graphics mode's aspect ratio.

Defined in header <graphics.h>

Syntax

#include <graphics.h>
void  far getaspectratio   (int far *xasp, int far *yasp);

Portability

Remarks

The y aspect factor, *yasp, is normaUzed to 10,000. On all graphics adapters except the VGA, *xasp (the x aspect factor) is less than *yasp because the pixels are taller than tKey are wide. On the VGA, which has "square" pixels, *xasp equals *yasp. In general, the relationship between *yasp and *xasp can be stated as

*yasp = 10,000 *xasp <= 10,000 getaspectratio gets the values in *xasp and *i/asp.

Return value

None.

See also

• arc
• circle
• ellipse
• fillellipse
• pieslice
• sector
• setaspectratio

Example

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

{
   /* request autodetection */
   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:");
      getchO ;
      exit(l);               /* terminate with an  error code */
   )
   midx = getmaxxO  / 2;
   midy = getmaxyO  / 2;
   setcolor(getmaxcolor 0);
   /* get current aspect ratio settings */
   getaspectratio (&xasp, &yasp);

   /* draw normal circle */
   circle(midx, midy, 100);
   getchO ;
   /* draw wide circle */
   cleardeviceO ;
   setaspectratio (xasp/2, yasp);
   circle(midx, midy, 100);
   getchO ;

   /* draw narrow circle */
   cleardeviceO ;
   setaspectratio(xasp, yasp/2);
   circle(midx, midy, 100);

   /* clean up */
getchO ;
closegraph(
return 0;

Differences from modern implementations

Nothing recorded yet.

Modern references

• Microsoft C runtime (search)

These are search links, not yet checked by hand.

Stable link: /3.1/graphics.h/getaspectratio/ · short form /3.1/getaspectratio/