cani_color_league_features
                        Check to see what features of a surface can be
                        colored by a user
cani_plot_league        Check to see if a league can be plotted, and
                        alert the user as to which functions that
                        league will work for
cani_plot_sport         Check to see if a sport can be plotted, and
                        alert the user as to which leagues are
                        plottable for the sport
convert_units           Function to convert all units, regardless of
                        starting and ending units
geom_baseball           Generate a ggplot2 instance containing a
                        regulation baseball field for a specified
                        league
geom_basketball         Create a ggplot2 instance of a scale model of a
                        basketball court
geom_football           This draws a football field in its standard
                        coordinate system, with (0, 0) being the bottom
                        left corner of the left-most endzone. Each unit
                        on the coordinate system corresponds to 1 yard
                        Generate a ggplot2 instance containing a
                        regulation football field for a specified
                        league
geom_hockey             Generate a ggplot2 instance containing an ice
                        rink for a specified league
geom_soccer             Generate a ggplot2 instance containing a soccer
                        pitch for a specified league
reflect                 Perform a mathematical reflection of
                        coordinates over a specified axis
rotate_coords           Perform a mathematical rotation about (0, 0) of
                        coordinates. This rotation is given as x' = x
                        \* cos(theta) - y \* sin(theta) y' = x \*
                        sin(theta) + y \* cos(theta)
translate               Perform a mathematical translation of
                        coordinates
