This chapter describes elementary subroutines that plot lines, vectors, circles, ellipses, pie segments and polygons. 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.