getaspectration

Syntax

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

Description

The y aspect factor, *yasp, is normalized 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 they 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 *yasp.

Return Value

None.

See also

None.

Example

/* getaspectratio example */ 

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

main()
{
   /* 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:");
      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();

   /* draw wide circle */
   cleardevice();
   setaspectratio(xasp/2, yasp);
   circle(midx, midy, 100);
   getch();


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

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