Arcs and Circles


circleprecision(nsegs)

Set the number of line segments making up a circle. Default is currently 32. The number of segments in an arc or sector is calculated from the variable "nsegs" according to the span of the arc or sector.

   Fortran:
        subroutine circleprecision(nsegs)
        integer   nsegs
   C:
        circleprecision(nsegs)
             int  nsegs;

   Pascal:
        procedure CirclePrecision(nsegs: integer)
circleprecision

circles are drawn with various circle precision values.


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

Draw an arc. x, y, and radius are values in world units.

   Fortran:
        subroutine arc(x, y, radius, startang, endang)
        REAL x, y, radius, startang, endang
   C:
        arc(x, y, radius, startang, endang)
             float  x, y, radius;
             float  startang, endang;

   Pascal:
        procedure Arc(x, y, radius, startang, endang: real)

Angles are in degrees, positive measured counterclockwise from the +X axis. The current position after the arc is drawn is at the end of the arc.

arc

The arcs are drawn; followed by a draw to the arc center (using "draw2(X,Y)").


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

Draw a sector. x, y, and radius are values in world units. Note: sectors are regarded as polygons, so if polyfill or polyhatch has been called with 1, the sectors will be filled or hatched accordingly.

   Fortran:
        subroutine sector(x, y, radius, startang, endang)
        REAL x, y, radius, startang, endang
   C:
        sector(x, y, radius, startang, endang)
             float  x, y, radius;
             float  startang, endang;

   Pascal:
        procedure Sector(x, y, radius, startang, endang: real)
sector

circle(x, y, radius)

Draw a circle. x, y, and radius are values in world units. Note: circles are regarded as polygons, so if polyfill or polyhatch has been called with 1, the circle will be filled or hatched accordingly. x and y real coordinates in user units.

   Fortran:
        subroutine circle(x, y, radius)
        REAL x, y, radius
   C:
        circle(x, y, radius)
             float     x, y, radius;

   Pascal:
        procedure Circle(x, y, radius: real)
circle

circles are drawn with polygon fill and hatch fill options. Multiple calls were used to create the filled, crosshatched and outlined circle.