make_polygons: Turns a set of points into hexagons

In mikkelkrogsholm/hexamapmaker: Turns Points into Hexagons

Description

make_polygons takes a set of points (x and y coordinates) and turns them into hexagons. The idea is, that you can quickly design the layout of a hexagon map by just adding points in a coordinate system. Then the hexamap function turns them into hexagon-shaped polygons that can be plotted with ggplot2.

Usage

make_polygons(z)

Arguments

z	A data frame containing x, y and id.

Value

The function returns a set of hexagons.

Examples

# Load libraries
library(hexamapmaker)
library(ggplot2)
library(tibble)
library(ggthemes)

# Points on a "normal" grid.
my_points <- tibble::tibble(
  x = c(1, 2, 1, 2, 1, 2, 4, 4),
  y = c(1, 1, 2, 2, 3, 3, 1, 2),
  id = c("test1", "test2", "test3", "test4", "test5", "test6", "test7", "test8")
)

# Plot the points
ggplot(my_points, aes(x = x, y = y, group = id)) +
  geom_point() +
  coord_fixed(ratio = 1) +
  theme_map()

# Turn points into hexagons
hexa_points <- make_polygons(my_points)

# Plot the new hexagons
ggplot(hexa_points, aes(x, y, group = id)) +
  geom_polygon(colour = "black", fill = NA) +
  coord_fixed(ratio = 1) +
  theme_map()

# Oh no! It is way off - lets fix it.
my_points <- fix_shape(my_points)

# Plot points
ggplot(my_points, aes(x = x, y = y, group = id)) +
  geom_point() +
  coord_fixed(ratio = 1) +
  theme_map()

# Turn points into hexagons
hexa_points <- make_polygons(my_points)

ggplot(hexa_points, aes(x, y, group = id)) +
  geom_polygon(colour = "black", fill = NA) +
  coord_fixed(ratio = 1) +
  theme_map()

# Add color by using the fill argument in ggplot.
# Remember to remove it from the geom_polygon then
(p <- ggplot(hexa_points, aes(x, y, group = id, fill = id)) +
    geom_polygon(colour = "black", show.legend = FALSE) +
    coord_fixed(ratio = 1) +
    theme_map())

# Label hexagons
add_hexalabel(hexa_points, p)

mikkelkrogsholm/hexamapmaker documentation built on May 24, 2019, 7:25 p.m.