These routines can only be called from level 2 or 3 after an axis system has been defined. Different line styles cannot be used. Y are real numbers containing the plot coordinates. Different line styles can be used. NU, NV are the plot coordinates of the second point.
Y are the user coordinates of the first point.
U, V are the user coordinates of the second point. IY1 are the plot coordinates of the start point. IX2, IY2 are the plot coordinates of the end point. The following subroutines plot geometric figures such as rectangles, circles, ellipses, pie segments and polygons. These routines can be used to plot only the outlines of figures or the figures can be filled in with shaded patterns.