arc

Syntax

#include <graphics.h>

void arc(int x, int y, int stangle, int endangle, int radius);

Description

arc draws a circular arc in the current drawing color centered at (x,y) with a radius given by radius. The arc travels from stangle to endangle. If stangle equals 0 and endangle equals 360, the call to arc draws a complete circle.

The angle for arc is reckoned counterclockwise, with 0 degrees at 3 o'clock, 90 degrees at 12 o'clock, and so on.

The linestyle parameter does not affect arcs, circles, ellipses, or pie slices. Only the thickness parameter is used.

If you are using a CGA in high resolution mode or a monochrome graphics adapter, the examples in online Help that show how to use graphics functions might not produce the expected results. If your system runs on a CGA or monochrome adapter, pass the value 1 to those functions that alter the fill or drawing color (setcolor, setfillstyle, and setlinestyle, for example), instead of a symbolic color constant (defined in graphics.h).

Return Value

None.

See also

circle

ellipse

fillellipse

getarcoords

getaspectratio

pieslice

sector

Example

/* arc example */ 



#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>



int main(void)

{

    /* request autodetection */

   int gdriver = DETECT, gmode, errorcode;

   int midx, midy;

   int stangle = 45, endangle = 135;

   int radius = 100;



   /* 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());



   /* draw arc */

   arc(midx, midy, stangle, endangle, radius);



   /* clean up */

   getch();

   closegraph();

   return 0;

}