lets_plot.geom_segment

lets_plot.geom_segment(mapping=None, *, data=None, stat=None, position=None, show_legend=None, sampling=None, tooltips=None, arrow=None, flat=None, geodesic=None, color_by=None, **other_args)

Draw a straight line segment between two points.

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 DataFrame or polars.DataFrame

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 as a string (‘identity’, ‘stack’, ‘dodge’, …), or the result of a call to a position adjustment function.

show_legendbool, default=True

False - do not show legend for this layer.

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.

arrowFeatureSpec

Specification for arrow head, as created by arrow() function.

flatbool, default=False.

True - keeps a line flat, False - allows projection to curve a line.

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_segment() draws segments.

geom_segment() understands the following aesthetics mappings:

  • x : x-axis value.

  • y : y-axis value.

  • xend : x-axis value.

  • yend : y-axis value.

  • alpha : transparency level of a layer. Accept values between 0 and 1.

  • color (colour) : color of the geometry lines. String in the following formats: RGB/RGBA (e.g. “rgb(0, 0, 255)”); HEX (e.g. “#0000FF”); color name (e.g. “red”).

  • size : line width.

  • linetype : type of the line. Codes and names: 0 = ‘blank’, 1 = ‘solid’, 2 = ‘dashed’, 3 = ‘dotted’, 4 = ‘dotdash’, 5 = ‘longdash’, 6 = ‘twodash’.

Examples

1from lets_plot import *
2LetsPlot.setup_html()
3ggplot() + geom_segment(x=0, y=0, xend=1, yend=1)


 1import numpy as np
 2from lets_plot import *
 3LetsPlot.setup_html()
 4T = 25
 5np.random.seed(42)
 6t = [0, *np.random.normal(size=T)]
 7x = np.cumsum(np.cos(t))
 8y = np.cumsum(np.sin(t))
 9data = {'x': x[:-1], 'y': y[:-1], 'xend': x[1:], 'yend': y[1:]}
10ggplot(data, aes(x='x', y='y')) + \
11    geom_segment(aes(xend='xend', yend='yend', color='xend'), \
12                 arrow=arrow(type='closed', angle=10)) + \
13    scale_color_gradient(low='#2c7bb6', high='#d7191c') + \
14    coord_fixed()


 1from lets_plot import *
 2LetsPlot.setup_html()
 3pushkin_1829_journey = {
 4    "dep_city": ["Moscow", "Oryol", "Novocherkassk", "Stavropol", \
 5                 "Georgiyevsk", "Vladikavkaz", "Tiflis", "Kars"],
 6    "arr_city": ["Oryol", "Novocherkassk", "Stavropol", "Georgiyevsk", \
 7                 "Vladikavkaz", "Tiflis", "Kars", "Erzurum"],
 8    "dep_lon": [37.618423, 36.098689, 40.110401, 41.9734, \
 9                43.4577689, 44.66778, 44.783333, 43.09495],
10    "arr_lon": [36.098689, 40.110401, 41.9734, 43.4577689, \
11                44.66778, 44.783333, 43.09495, 41.27694],
12    "dep_lat": [55.751244, 52.929697, 47.414101, 45.0428, \
13                44.1497667, 43.03667, 41.716667, 40.60199],
14    "arr_lat": [52.929697, 47.414101, 45.0428, 44.1497667, \
15                43.03667, 41.716667, 40.60199, 39.90861],
16}
17ggplot(pushkin_1829_journey) + geom_livemap(const_size_zoomin=0) + \
18    geom_segment(aes(x="dep_lon", y="dep_lat", xend="arr_lon", yend="arr_lat"), \
19                 size=1, color="#fc4e2a", arrow=arrow(), \
20                 tooltips=layer_tooltips().line("from @dep_city to @arr_city"))