create_scale_bar: Create a scale bar

In paulhegedus/OFPE: On-Farm Precision Experiments (OFPE) Data Management and Analysis Tools

Create a scale bar

Description

Function from 3wen/legendMap repo for 'adding a North arrow and/or a scale bar to maps done using ggplot2'. All credit for this function goes to Ewen Gallic. All notation and documentation is from Ewen Gallic.

This function creates a scale bar. See https://github.com/3wen/legendMap.git for examples.

Usage

create_scale_bar(
  lon,
  lat,
  distance_lon,
  distance_lat,
  distance_legend,
  dist_units = "km"
)

Arguments

lon	Longitude of the bottom left point of the first rectangle to draw.
lat	Latitude of the bottom left point of the first rectangle to draw.
distance_lon	Length of each rectangle.
distance_lat	Width of each rectangle.
distance_legend	Distance between rectangles and legend texts.
dist_units	Units of distance "km" (kilometers) (default), "nm" (nautical miles), "mi" (statute miles).

Value

Return a list whose elements are; 'rectangle': a data.frame containing the coordinates to draw the first rectangle, 'rectangle2': a data.frame containing the coordinates to draw the second rectangle, and 'legend': a data.frame containing the coordinates of the legend texts, and the texts as well.

Source

https://github.com/3wen/legendMap.git

paulhegedus/OFPE documentation built on Nov. 23, 2022, 5:09 a.m.