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c:graphics.h:getarccoords

getarccoords

Syntax of getarccoords

#include <graphics.h>
void getarccoords(struct arccoordstype *arccoords);
 

Description of getarccoords

getarccoords fills in the arccoordstype structure pointed to by arccoords
with information about the last call to arc. The arccoordstype structure
is defined in graphics.h as follows:
struct arccoordstype {
   int x, y;
   int xstart, ystart, xend, yend;
};
The members of this structure are used to specify the center point (x,y),
the starting position (xstart, ystart), and the ending position (xend,
yend) of the arc. These values are useful if you need to make a line meet
at the end of an arc.

Example of getarccoords

/* getarccoords example */
 
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
 
int main(void)
{
   /* request autodetection */
   int gdriver = DETECT, gmode, errorcode;
   struct arccoordstype arcinfo;
   int midx, midy;
   int stangle = 45, endangle = 270;
   char sstr[80], estr[80];
 
   /* 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;
 
   /* draw arc and get coordinates */
   setcolor(getmaxcolor());
   arc(midx, midy, stangle, endangle, 100);
   getarccoords(&arcinfo);
 
   /* convert arc information into strings */
   sprintf(sstr, "*- (%d, %d)", arcinfo.xstart, arcinfo.ystart);
 
   sprintf(estr, "*- (%d, %d)", arcinfo.xend, arcinfo.yend);
 
   /* output the arc information */
   outtextxy(arcinfo.xstart, arcinfo.ystart, sstr);
   outtextxy(arcinfo.xend, arcinfo.yend, estr);
 
   /* clean up */
   getch();
   closegraph();
   return 0;
}

See also

output of getarccoords example

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

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