TRACK_META              Get meta data in the current track
current_spiral          Get the current spiral object
current_spiral_vp       Viewport name of the current spiral
current_track_index     Helper functions for handling tracks
get_track_data          Meta-data of a track
horizon_legend          Legend for the horizon chart
solve_theta_from_spiral_length
                        Get theta from given spiral lengths
spiral_arrow            Draw arrows in the spiral direction
spiral_axis             Draw axis along the spiral
spiral_bars             Add bars to a track
spiral_clear            Clear the spiral curve
spiral_dendrogram       Draw dendrogram
spiral_git_commits      Visualize git commits
spiral_highlight        Highlight a section of the spiral
spiral_highlight_by_sector
                        Highlight a sector
spiral_horizon          Draw horizon chart along the spiral
spiral_info             Information of the current spiral
spiral_initialize       Initialize the spiral
spiral_initialize_by_gcoor
                        Initialize the spiral with genomic coordinates
spiral_initialize_by_time
                        Initialize the spiral from time objects
spiral_lines            Add lines to a track
spiral_opt              Global options
spiral_phylo            Draw phylogenetic tree
spiral_pkg_downloads    Visualize package downloads
spiral_points           Add points to a track
spiral_polygon          Add polygons to a track
spiral_raster           Add image to a track
spiral_rect             Add rectangles to a track
spiral_segments         Add segments to a track
spiral_text             Add texts to a track
spiral_track            Add a new track or move to an existed track
spiral_yaxis            Draw y-axis
xy_to_cartesian         Transform between coordinate systems
