lets_plot.geom_path#
- lets_plot.geom_path(mapping=None, *, data=None, stat=None, position=None, show_legend=None, manual_key=None, sampling=None, tooltips=None, map=None, map_join=None, use_crs=None, flat=None, geodesic=None, color_by=None, **other_args)#
Connect observations in the order, how they appear in the data.
- Parameters:
- mappingFeatureSpec
Set of aesthetic mappings created by aes() function. Aesthetic mappings describe the way that variables in the data are mapped to plot “aesthetics”.
- datadict or Pandas or Polars DataFrame or GeoDataFrame
The data to be displayed in this layer. If None, the default, the data is inherited from the plot data as specified in the call to ggplot.
- statstr, default=’identity’
The statistical transformation to use on the data for this layer, as a string. Supported transformations: ‘identity’ (leaves the data unchanged), ‘count’ (counts number of points with same x-axis coordinate), ‘bin’ (counts number of points with x-axis coordinate in the same bin), ‘smooth’ (performs smoothing - linear default), ‘density’ (computes and draws kernel density estimate).
- positionstr or FeatureSpec, default=’identity’
Position adjustment. Either a position adjustment name: ‘dodge’, ‘dodgev’, ‘jitter’, ‘nudge’, ‘jitterdodge’, ‘fill’, ‘stack’ or ‘identity’, or the result of calling a position adjustment function (e.g., position_dodge() etc.).
- show_legendbool, default=True
False - do not show legend for this layer.
- manual_keystr or layer_key
The key to show in the manual legend. Specify text for the legend label or advanced settings using the layer_key() function.
- samplingFeatureSpec
Result of the call to the sampling_xxx() function. To prevent any sampling for this layer pass value “none” (string “none”).
- tooltipslayer_tooltips
Result of the call to the layer_tooltips() function. Specify appearance, style and content.
- mapGeoDataFrame
Data containing coordinates of lines.
- map_joinstr or list
Keys used to join map coordinates with data. First value in pair - column/columns in data. Second value in pair - column/columns in map.
- use_crsstr, optional, default=”EPSG:4326” (aka WGS84)
EPSG code of the coordinate reference system (CRS) or the keyword “provided”. If an EPSG code is given, then all the coordinates in GeoDataFrame (see the map parameter) will be projected to this CRS. Specify “provided” to disable any further re-projection and to keep the GeoDataFrame’s original CRS.
- flatbool, default=False.
True - keep a line straight (corresponding to a loxodrome in case of Mercator projection). False - allow a line to be reprojected, so it can become a curve.
- geodesicbool, default=False
Draw geodesic. Coordinates expected to be in WGS84. Works only with geom_livemap().
- color_by{‘fill’, ‘color’, ‘paint_a’, ‘paint_b’, ‘paint_c’}, default=’color’
Define the color aesthetic for the geometry.
- other_args
Other arguments passed on to the layer. These are often aesthetics settings used to set an aesthetic to a fixed value, like color=’red’, fill=’blue’, size=3 or shape=21. They may also be parameters to the paired geom/stat.
- Returns:
- LayerSpec
Geom object specification.
Notes
geom_path() connects the observations in the order in which they appear in the data. geom_path() lets you explore how two variables are related over time.
geom_path() understands the following aesthetics mappings:
x : x-axis value.
y : y-axis value.
alpha : transparency level of a layer. Accept values between 0 and 1.
color (colour) : color of the geometry. For more info see https://lets-plot.org/python/pages/aesthetics.html#color-and-fill.
linetype : type of the line. Codes and names: 0 = ‘blank’, 1 = ‘solid’, 2 = ‘dashed’, 3 = ‘dotted’, 4 = ‘dotdash’, 5 = ‘longdash’, 6 = ‘twodash’. For more info see https://lets-plot.org/python/pages/aesthetics.html#line-types.
size : line width.
The data and map parameters of GeoDataFrame type support shapes LineString and MultiLineString.
The conventions for the values of map_join parameter are as follows.
Joining data and GeoDataFrame object
Data has a column named ‘State_name’ and GeoDataFrame has a matching column named ‘state’:
map_join=[‘State_Name’, ‘state’]
map_join=[[‘State_Name’], [‘state’]]
Joining data and Geocoder object
Data has a column named ‘State_name’. The matching key in Geocoder is always ‘state’ (providing it is a state-level geocoder) and can be omitted:
map_join=’State_Name’
map_join=[‘State_Name’]
Joining data by composite key
Joining by composite key works like in examples above, but instead of using a string for a simple key you need to use an array of strings for a composite key. The names in the composite key must be in the same order as in the US street addresses convention: ‘city’, ‘county’, ‘state’, ‘country’. For example, the data has columns ‘State_name’ and ‘County_name’. Joining with a 2-keys county level Geocoder object (the Geocoder keys ‘county’ and ‘state’ are omitted in this case):
map_join=[‘County_name’, ‘State_Name’]
Examples
1import numpy as np 2from lets_plot import * 3LetsPlot.setup_html() 4n = 100 5t = np.linspace(0, 2 * np.pi, n) 6data = {'x': t * np.sin(t), 'y': t * np.cos(t)} 7ggplot(data, aes(x='x', y='y')) + geom_path()
1import numpy as np 2from lets_plot import * 3LetsPlot.setup_html() 4T = 50 5np.random.seed(42) 6x = np.cumsum(np.random.normal(size=2*T)) 7y = np.cumsum(np.random.normal(size=2*T)) 8c = [0] * T + [1] * T 9data = {'x': x, 'y': y, 'c': c} 10ggplot(data, aes(x='x', y='y', group='c')) + \ 11 geom_path(aes(color='c'), size=2, alpha=.5) + \ 12 scale_color_discrete()
1from lets_plot import * 2from lets_plot.geo_data import * 3LetsPlot.setup_html() 4pushkin_1829_journey = { 5 "city": ["Moscow", "Oryol", "Novocherkassk", "Stavropol", \ 6 "Georgiyevsk", "Vladikavkaz", "Tiflis", "Kars", "Erzurum"], 7 "latitude": [55.751244, 52.929697, 47.414101, 45.0428, \ 8 44.1497667, 43.03667, 41.716667, 40.60199, 39.90861], 9 "longitude": [37.618423, 36.098689, 40.110401, 41.9734, \ 10 43.4577689, 44.66778, 44.783333, 43.09495, 41.27694], 11} 12ggplot(pushkin_1829_journey, aes("longitude", "latitude")) + \ 13 geom_livemap(const_size_zoomin=0) + \ 14 geom_point(size=3, color="#fc4e2a", tooltips=layer_tooltips().line("@city")) + \ 15 geom_path(color="#fc4e2a")
The geodata is provided by © OpenStreetMap contributors and is made available here under the Open Database License (ODbL).