arc(3g) — 4D1 2.0



     arc(3G)                                                   arc(3G)



     NAME

          arc - draws a circular arc


     SPECIFICATION

          C         arc(x, y, radius, startang, endang)

                    Coord x, y, radius;

                    Angle startang, endang;


                    arci(x, y, radius, startang, endang)

                    Icoord x, y, radius;

                    Angle startang, endang;


                    arcs(x, y, radius, startang, endang)

                    Scoord x, y, radius;

                    Angle startang, endang;




          FORTRAN   subroutine arc(x, y, radius, stang, endang)

                    real x, y, radius

                    integer*4 stang, endang


                    subroutine arci(x, y, radius, stang, endang)

                    integer*4 x, y, radius, stang, endang


                    subroutine arcs(x, y, radius, stang, endang)

                    integer*2 x, y, radius

                    integer*4 stang, endang


     DESCRIPTION

          arc draws a circular arc.  The parameters of an arc are the

          center point (x,y), radius (radius), starting angle

          (startang), and ending angle (endang).  The angle of the arc

          is measured from the positive x axis and specified in

          integral tenths of degrees (e.g., 90 degrees equal 900

          tenths of degrees).  Positive angles describe

          counterclockwise rotations.  Since an arc is a 2-D shape,

          these routines have only 2-D forms.  The arc is drawn in the

          x-y plane, with z=0, and uses the current color, linestyle,

          linewidth, and writemask.  It is drawn counterclockwise from

          startang to endang.  For example, an arc from 10 degrees to

          5 degrees (100 to 50 tenths of degrees) is a nearly complete

          circle.  After arc executes, the graphics position is

          undefined.


     SEE ALSO

          arcf, circ, circf, crv


          Programming Guide, Section 3.7, Circles and Arcs







     Page 1                                          (printed 8/20/87)
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