draw-arc

Draws an arc. The current pen is used for the arc and the current brush for filling a wedge.

If both the pen and brush are non-transparent, the wedge is filled with the brush before the arc is drawn with the pen. The wedge and arc meet so that no space is left between them, but the precise overlap between the wedge and arc is platform- and size-specific. Thus, the regions drawn by the brush and pen may partially overlap.

• (send a-dc draw-arc x y width height start-radians end-radians) -> void
      x : real number
      y : real number
      width : non-negative real number
      height : non-negative real number
      start-radians : real number
      end-radians : real number

  Draws a counter-clockwise circular arc, a part of the ellipse inscribed in the rectangle specified by x, y, width, and height. The arc starts at the angle specified by start-radians (0 is 3 o'clock) and continues counter-clockwise to end-radians. If start-radions and end-radians are the same, a full ellipse is drawn.

  If the current brush is not transparent, it is used to fill the wedge bounded by the arc plus lines (not drawn) extending to the center of the inscribed ellipse.

  Restrictions on the magnitude of drawing coordinates are described with dc<%>.