tracktable.render.backends.ipyleaflet_backend module

Note

This module is used by render_trajectories and render_heatmap and shouldn’t be accessed directly.

Module contents

tracktable.render.ipyleaflet - render trajectories in using the ipyleaflet backend

tracktable.render.backends.ipyleaflet_backend.crs_scale(zoom)

Scale the CRS based on zoom factor

tracktable.render.backends.ipyleaflet_backend.crs_zoom(scale)

Zoom the CRS based on scale factor

tracktable.render.backends.ipyleaflet_backend.get_bounds_zoom(map_canvas, bounds, inside=True, size=[960, 400], padding=[0, 0])

Get the zoom if the bounding box corners

Parameters

• map (Basemap) – Map containing bounding box

• bounds (point) – Long-Lat point of the bounding box corners

Keyword Arguments

• inside (bool) – Flag to indicate inside of the bounding box

• size (list) – Size of the bouning box

• padding (list) – Padding of boundries

Returns

The maximum zoom level on which the given bounds fit to the map vie in its entirety

tracktable.render.backends.ipyleaflet_backend.get_scale_zoom(scale, from_zoom)

Get zoom scale factor

tracktable.render.backends.ipyleaflet_backend.project(latlng, zoom)

Projects a geographical coordinate according to the projection of the map’s CRS then scales it according to zoom and the CRS’s Transformation

Parameters

• latlng (point) – Point to project

• zoom (int) – Zoom value to scale by

Returns

Pixel coord relative to the CRS origin

tracktable.render.backends.ipyleaflet_backend.project_spherical_mercator(latlng)

Project the spherical mercator for a given lat long value

Parameters

latlng (point) – Point transform

Returns

Projection of spherical mercator

tracktable.render.backends.ipyleaflet_backend.render_point_ipyleaflet(current_point, point_popup_properties, coord, point_radius, point_color, map_canvas)

Renders a point to the ipyleaflet map.

Currently not officially supported. Just for experimentation!

Parameters

• current_point (point) – Current point of the trajectory

• point_popup_properties (list) – Point properties

• coord (tuple) – Coordinates to render point

• point_radius (int) – Size of the point to render

• point_color (str) – Color of the point to render

• map (Basemap) – ipyleaflet map

Returns

No return value

tracktable.render.backends.ipyleaflet_backend.render_trajectories(trajectories, map_canvas=None, obj_ids=[], map_bbox=None, show_lines=True, gradient_hue=None, color_map='', line_color='', linewidth=2.4, show_points=False, point_size=0.6, point_color='', show_dot=True, dot_size=0.7, dot_color='white', trajectory_scalar_generator=<function path_length_fraction_generator>, trajectory_linewidth_generator=None, color_scale=matplotlib.colors.Normalize, show=False, save=False, filename='', tiles='cartodbdark_matter', attr='.', point_popup_properties=[], show_distance_geometry=False, distance_geometry_depth=4, show_scale=True, max_zoom=22, **kwargs)

Render a list of trajectories using the ipyleaflet backend

For documentation on the parameters, please see render_trajectories

Currently not officially supported. Just for experimentation!

tracktable.render.backends.ipyleaflet_backend.transform(point, scale)

Transform the given point based on the scale factor

Parameters

• point (point) – Point transform

• scale (int) – Scale factor to transform by

Returns

Scaled (x,y) values