create_raster_plot: create_raster_plot

Description

The function is wrapper around ggplot2::geom_raster() that plots from a data.frame with columns for x and y coordinates along with an associated numeric attribute.

The function accepts a data frame with columns for numeric x/y values and an attribute that will be mapped as a color or fill aesthetic. Function provides additional ggplot2 text labeling and axis scaling.

Usage

create_raster_plot(
  df,
  aes_x = NULL,
  aes_y = NULL,
  aes_color = NULL,
  aes_fill = NULL,
  interpolate = FALSE,
  title = NULL,
  subtitle = NULL,
  caption = NULL,
  center_titles = FALSE,
  x_title = NULL,
  y_title = NULL,
  hide_x_tics = FALSE,
  hide_y_tics = FALSE,
  panel_color = "white",
  panel_border_color = "black",
  x_limits = NULL,
  x_major_breaks = waiver(),
  x_minor_breaks = waiver(),
  x_labels = waiver(),
  y_limits = NULL,
  y_major_breaks = waiver(),
  y_minor_breaks = waiver(),
  y_labels = waiver(),
  scale_breaks = waiver(),
  scale_values = NULL,
  scale_limits = NULL,
  scale_labels = waiver(),
  scale_colors = heat.colors(8),
  scale_na_value = "gray50",
  own_scale = FALSE,
  show_legend = TRUE,
  legend_pos = "right",
  legend_key_width = 0.5,
  legend_key_height = 0.7,
  legend_key_backgrd = "white"
)

Value

A ggplot class object.

Arguments

df: The required data.frame derived from a raster file (such as *.tiff) to be plotted.
aes_x: The required name of aesthetic variable from 'df' for the x dimension.
aes_y: The required name of aesthetic variable from 'df' for the y dimension.
aes_color: The variable name from 'df' for the attribute dependent aesthetic mapping for color.
aes_fill: The variable name from 'df' for the attribute dependent aesthetic mapping for fill.
interpolate: A logical which if TRUE interpolate linearly.
title: A string that sets the plot title.
subtitle: A string that sets the plot subtitle.
caption: A string that sets the plot caption
center_titles: A logical which if TRUE centers both the 'title' and 'subtitle'.
x_title: A string that sets the x axis title. If NULL (the default) then the x axis title does not appear.
y_title: A string that sets the y axis title. If NULL (the default) then the y axis title does not appear.
hide_x_tics: A logical that controls the appearance of the x axis tics.
hide_y_tics: A logical that controls the appearance of the y axis tics.
panel_color: A string in hexidecimal or color name that sets the plot panel's color. The default is "white".
panel_border_color: A string in hexidecimal or color name that sets the plot panel's border color. The default is "black".
x_limits: Depending on the class of 'aes_x', a numeric/Date/POSIXct 2 element vector that sets the minimum and maximum for the x axis. Use NA to refer to the existing minimum and maximum.
x_major_breaks: Depending on the class of 'aes_x', a numeric/Date/POSIXct vector or function that defines the exact major tic locations along the x axis.
x_minor_breaks: Depending on the class of 'aes_x', a numeric/Date/POSIXct vector or function that defines the exact minor tic locations along the x axis.
x_labels: A character vector with the same length as 'x_major_breaks', that labels the major tics.
y_limits: A numeric 2 element vector that sets the minimum and maximum for the y axis. Use NA to refer to the existing minimum and maximum.
y_major_breaks: A numeric vector or function that defines the exact major tic locations along the y axis.
y_minor_breaks: A numeric vector or function that defines the exact minor tic locations along the y axis.
y_labels: A character vector with the same length as 'y_major_breaks', that labels the major tics.
scale_breaks: A string/numeric vector that defines the scale breaks.
scale_values: A string/numeric vector that defines the possible values.
scale_limits: A string/numeric vector that defines the scale limits.
scale_labels: An optional string vector that defines the scale labels. Vector must be the same length as scale_breaks.
scale_colors: Vector of colors to use for n-color gradient.
scale_na_value: A string that sets the color for missing values.
own_scale: A logical which if TRUE, then your own scaling may be appended to the plot without using the above scale_* parameters.
show_legend: A logical that controls the appearance of the legend.
legend_pos: A string that sets the legend position. Acceptable values are "top", "bottom", "left", "right".
legend_key_width: A numeric that sets the legend width in cm.
legend_key_height: A numeric that sets the legend height in cm.
legend_key_backgrd: A string that sets the legend's background color.

Examples

Run this code

library(ggplot2)
library(RplotterPkg)

RplotterPkg::create_raster_plot(
  df = RplotterPkg::kentucky_elevation,
  title = "County Elevations in Southeast Kentucky",
  aes_x = "x",
  aes_y = "y",
  aes_fill = "elevation"
) +
ggplot2::geom_sf(
  data = RplotterPkg::kentucky_counties,
  aes(x = NULL, y = NULL),
  alpha = 0,
  linewidth = 1.5
) +
ggplot2::geom_sf_text(
  data = RplotterPkg::kentucky_counties,
  aes(x = NULL, y = NULL, label = ID)
)

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