gcf_grid: Create contour plot from grid data using ggplot2

In ContourFunctions: Create Contour Plots from Data or a Function

Create contour plot from grid data using ggplot2

Description

The same as cf_grid_screen but uses ggplot2 for the plot.

Usage

gcf_grid(
  x = seq(0, 1, length.out = nrow(z)),
  y = seq(0, 1, length.out = ncol(z)),
  z,
  xlim = range(x, finite = TRUE),
  ylim = range(y, finite = TRUE),
  zlim = range(z, finite = TRUE),
  with_lines = FALSE,
  lines_only = FALSE,
  bins = 8,
  interpolate = TRUE,
  levels = pretty(zlim, nlevels),
  nlevels = 20,
  color.palette = cm.colors.strong,
  col = color.palette(length(levels) - 1),
  asp = NA,
  las = 1,
  bar = F,
  pts = NULL,
  reset.par = TRUE,
  pretitle = "",
  posttitle = "",
  main = NULL,
  mainminmax = !bar,
  mainminmax_minmax = TRUE,
  afterplotfunc = NULL,
  cex.main = par()$cex.main,
  ...
)

Arguments

x	x values, must form grid with y. If not given, it is assumed to be from 0 to 1.
y	y values, must form grid with x. If not given, it is assumed to be from 0 to 1.
z	z values at grid locations
xlim	x limits for the plot.
ylim	y limits for the plot.
zlim	z limits for the plot.
with_lines	Should lines be added on top of contour to show contours?
lines_only	Should no fill be used, only contour lines?
bins	Number of lines used when using 'with_lines' or 'lines_only'
interpolate	Will smooth out contours
levels	a set of levels which are used to partition the range of z. Must be strictly increasing (and finite). Areas with z values between consecutive levels are painted with the same color.
nlevels	if levels is not specified, the range of z, values is divided into approximately this many levels.
color.palette	a color palette function to be used to assign colors in the plot. Defaults to cm.colors. Other options include rainbow, heat.colors, terrain.colors, topo.colors, and function(x) {gray((1:x)/x)}.
col	an explicit set of colors to be used in the plot. This argument overrides any palette function specification. There should be one less color than levels
asp	the y/x aspect ratio, see plot.window.
las	the style of labeling to be used. The default is to use horizontal labeling.
bar	Should a bar showing the output range and colors be shown on the right?
pts	Points to plot on top of contour
reset.par	Should the graphical parameters be reset before exiting? Usually should be unless you need to add something to the plot afterwards and bar is TRUE.
pretitle	Text to be preappended to end of plot title
posttitle	Text to be appended to end of plot title
main	Title for the plot
mainminmax	whether the min and max values should be shown in the title of plot
mainminmax_minmax	Whether [min,max]= should be shown in title or just the numbers
afterplotfunc	Function to call after plotting, such as adding points or lines.
cex.main	The size of the main title. 1.2 is default.
...	additional graphical parameters, currently only passed to title().

Value

ggplot2 object

Examples

x <- y <- seq(-4*pi, 4*pi, len = 27)
r <- sqrt(outer(x^2, y^2, "+"))
gcf_grid(cos(r^2)*exp(-r/(2*pi)))
gcf_grid(r, color.palette=heat.colors, bar=TRUE)
gcf_grid(r, color.palette=function(x) {gray((1:x)/x)}, bar=TRUE)

ContourFunctions documentation built on Sept. 11, 2024, 8:47 p.m.