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c:graphics.h:getaspectration

getaspectration

Syntax of getaspectration

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

Description of getaspectration

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.

Example of getaspectration

/* 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;
}

See also

output of getaspectration example

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c/graphics.h/getaspectration.txt · Last modified: 2015/05/06 23:06 (external edit)

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