draw-lines in dc<%>

Draws multiple connected lines. The current pen is used for drawing the lines.

• (send a-dc draw-lines points xoffset yoffset) -> void
     points : list of point% objects
     xoffset = 0 : real number
     yoffset = 0 : real number

  Draws lines using a list of points, adding xoffset and yoffset to each point.

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