Consider creating gf_fun2d() for plotting functions of two variables

[rpruim]

This would be like mosaic::plotFun().

[rpruim]

Prototype created:

library(ggformula)
#> Loading required package: ggplot2
#> 
#> New to ggformula?  Try the tutorials: 
#>  learnr::run_tutorial("introduction", package = "ggformula")
#>  learnr::run_tutorial("refining", package = "ggformula")
theme_set(theme_bw())
gf_function_2d( fun = function(x, y) sin(2 * x * y), xlim = c(-pi, pi), ylim = c(-pi, pi)) %>%
  gf_refine(scale_fill_viridis_c())

gf_function_2d( fun = function(x, y) x + y, contour = FALSE) %>%
  gf_refine(scale_fill_viridis_c())

gf_function_tile(fun = function(x, y) x * y) %>%
gf_function_contour(fun = function(x, y) x * y, color = "white") %>%
  gf_refine(scale_fill_viridis_c())

gf_fun_tile(x * y ~ x + y, xlim = c(-2, 2), ylim = c(-3, 3)) %>%
  gf_fun_contour(x * y ~ x + y, color = "white") %>%
  gf_refine(scale_fill_viridis_c())

Created on 2018-06-28 by the reprex package (v0.2.0).

[rpruim]

Trying to decide what the default label for the fill guide should be. f.value is just a place holder.

It can, of course, be overridden using gf_labs()

[rpruim]

Current plan: default is no label on the fill. Users can use gf_labs() to add a label if one is desired.

library(ggformula)
theme_set(theme_bw())
gf_function_2d( fun = function(x, y) sin(2 * x * y), xlim = c(-pi, pi), ylim = c(-pi, pi)) %>%
  gf_refine(scale_fill_viridis_c())

Created on 2018-07-31 by the reprex package (v0.2.0).