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.Dd December 21, 2022
.Dt VG_ARC 3
.Os Agar 1.7
.Sh NAME
.Nm VG_Arc
.Nd agar-vg arc entity
.Sh SYNOPSIS
.Bd -literal
#include <agar/core.h>
#include <agar/gui.h>
#include <agar/vg.h>
.Ed
.Sh DESCRIPTION
.Nm
is a
.Xr VG 3
node class which describes an arc in terms of a centerpoint, radius and and
two angles.
.Sh INTERFACE
.nr nS 1
.Ft "VG_Arc *"
.Fn VG_ArcNew "VG_Node *parent" "VG_Point *centerPoint" "float r" "float a1" "float a2"
.Pp
.Ft "void"
.Fn VG_ArcCenter "VG_Arc *va" "VG_Point *centerPoint"
.Pp
.Ft "void"
.Fn VG_ArcRadius "VG_Arc *va" "float r"
.Pp
.Ft "void"
.Fn VG_ArcAngles "VG_Arc *va" "float a1" "float a2"
.Pp
.nr nS 0
The
.Fn VG_ArcNew
function creates a new arc entity attached to
.Fa parent .
.Fa centerPoint
is a
.Xr VG_Point 3
defining the center of the arc and
.Fa r
is the radius.
The starting and ending angles are specified by
.Fa a1
and
.Fa a2 ,
in radians.
.Pp
The
.Fn VG_ArcCenter
routine changes the centerpoint of an existing
.Nm .
.Fn VG_ArcRadius
changes the radius.
.Fn VG_ArcAngles
changes the angles.
.Sh SEE ALSO
.Xr VG 3 ,
.Xr VG_Circle 3 ,
.Xr VG_Point 3
.Sh HISTORY
The
.Nm
class first appeared in Agar 1.3.3.