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c:graphics.h:getaspectration

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c:graphics.h:getaspectration [2015/05/06 23:06] (current)
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 +===== getaspectration =====
 +
 +
 +====Syntax of getaspectration ==== 
 + <code c>
 +#include <graphics.h>
 +void getaspectratio(int *xasp, int *yasp);
 +  </code>
 +
 +
 +==== Description of getaspectration ==== 
 +<code c>
 +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.
 +</code>
 +
 +
 +==== Example of getaspectration ====
 +<code c>
 +/* 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;
 +}
 +</code>
 +
 +
 +==== See also ====
 +[[None.]]
 +
 +
 +===== output of getaspectration example ===== 
 +
 +    no output of example at the moment
 +    do not hesitate and add it...  
 +
 +
  
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c/graphics.h/getaspectration.txt · Last modified: 2015/05/06 23:06 (external edit)

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