get_density_map: Creates a map with a gradient scale.

In bclroger/euparliament: Analysis of the EU Parliament elections of 2014 and 2019

Description

This function creates a map based on the dataframe assigned to argument data that creates a map showing the values of the column assigned to the fill_by argument with a gradient scale.

Usage

get_density_map(data, fill_by, legend = "", title = "", gradmin = 0, gradmax = 100, gradnum = 4, colors = c("#FFFFFF", "#224d77"))

Arguments

data	The dataframe with the polygon data and other data.
fill_by	The column that with the desired info to be shown in the map.
legend	The string to be used as legend of the map.
title	The string to be used as title of map.
gradmin	Lowest value shown in the gradient scale. Default: 0.
gradmax	Highest value shown in the gradient scale. Default: 100.
gradnum	Number of intervals shown in the gradient scale. Default: 4.
colors	The color gradient of "fill_by" info. Default: "#FFFFFF","#224d77".

Value

Plots a map with a gradient scale using epsg: 3035 as a projection (Azimuthal equal area focused on the European Union) showing the values of the selected column from the selected dataframe.

Examples

Country <- c("Austria", "Belgium", "Bulgaria", "Croatia")
EPP <- c(7,22,31,48)
SD <- c(41,15,28,33)
Other <- c(35,42,10,5)
IN <- c(25,34,42,14)
df.data <- data.frame(Country, EPP, SD, Other, IN)
library("rnaturalearth")
library("rnaturalearthdata")
library("ggplot2")
world <- ne_countries(scale = "medium", returnclass = "sf")

t_world <- merge(world, df.data, by.x="name_long", by.y="Country")


get_density_map(t_world, t_world$EPP, legend="Seats", title= "Seats Held by EPP", gradmax=50, gradnum =5)

bclroger/euparliament documentation built on Jan. 26, 2020, 12:56 a.m.