Graphics routines
| Ngl.add_polygon | Adds a polygon to an existing plot. |
| Ngl.add_polyline | Adds a polyline to an existing plot. |
| Ngl.add_polymarker | Adds polymarkers to an existing plot. |
| Ngl.add_text | Adds text strings to an existing plot. |
| Ngl.contour | Creates and draws a contour plot. |
| Ngl.contour_map | Creates and draws a contour plot over a map. |
| Ngl.draw_ndc_grid | Draws and labels grid lines at 0.1 NDC intervals. |
| Ngl.labelbar_ndc | Draws a labelbar anywhere in the viewport. |
| Ngl.legend_ndc | Draws a legend anywhere in the viewport. |
| Ngl.map | Creates and draws a map. |
| Ngl.new_dash_pattern | Adds new dash patterns to the existing table of dash patterns. |
| Ngl.new_marker | Adds new markers to the existing table of markers. |
| Ngl.panel | Draws multiple plots of identical size on a single frame. |
| Ngl.polygon | Draws a polygon on an existing plot. |
| Ngl.polygon_ndc | Draws a filled polygon on the viewport. |
| Ngl.polyline | Draws a polyline on an existing plot. |
| Ngl.polyline_ndc | Draws a polyline on the viewport. |
| Ngl.polymarker | Draws polymarkers on an existing plot. |
| Ngl.polymarker_ndc | Draws polymarkers on the viewport. |
| Ngl.skewt_bkg | Creates a background chart for Skew T, Log P plotting. |
| Ngl.skewt_plt | Plots soundings and (optionally) winds on Skew T, Log P charts created by Ngl.skewt_bkg. |
| Ngl.streamline | Creates and draws a streamline plot. |
| Ngl.streamline_map | Creates and draws a streamline plot over a map. |
| Ngl.streamline_scalar | Creates and draws a streamline plot with the streamlines colored by a scalar field. |
| Ngl.streamline_scalar_map | Creates and draws streamlines, colored by a scalar field, over a map. |
| Ngl.text | Draws text strings on an existing plot. |
| Ngl.text_ndc | Draws text strings on the viewport. |
| Ngl.vector | Creates and draws a vector plot. |
| Ngl.vector_map | Creates and draws a vector plot over a map. |
| Ngl.vector_scalar | Creates and draws a vector plot with the vectors colored by a scalar field. |
| Ngl.vector_scalar_map | Creates and draws vectors, colored by a scalar field, over a map. |
| Ngl.wmbarb | Draws wind barbs at specified locations. |
| Ngl.wmbarbmap | Draws wind barbs over maps at specified locations. |
| Ngl.wmgetp | Retrieves control parameter values for Ngl.wmxxxx procedures. |
| Ngl.wmsetp | Sets control parameter values for Ngl.wmxxxx procedures. |
| Ngl.wmstnm | Draws station model data. |
| Ngl.xy | Creates and draws an XY plot. |
| Ngl.y | Creates and draws an XY plot using index values for the X axis. |