allow textcolor

R/plot_helpers.R

                       text_size = 7, title_size = 25, ...) {
 
   if (!".alpha" %in% names(d)) d <- d %>% mutate(.alpha = 1)
-  d <- d %>% mutate(.item_id = paste(.id_long, .col, sep = "-"))
+  if (!".textcolor" %in% names(d))
+    d <- d %>% mutate(.textcolor = set_text_color(.color))
+
+  if (".col" %in% names(d)) {
+    d <- d %>% mutate(.item_id = paste(.id_long, .col, sep = "-"))
+  } else {
+    # tidyr
+    d <- d %>% mutate(.item_id = .id_long)
+  }
 
   ggplot(d, aes(x = .x, group = .item_id, y = .y, fill = .color, alpha = .alpha)) +
     geom_tile(width = 0.9, height = 0.9) +
     coord_equal() +
-    geom_text(data = d %>% filter(!is.na(.val)), aes(label = .val), color = "white",
+    geom_text(data = d %>% filter(!is.na(.val)), aes(label = .val, color = .textcolor),
               family = text_family, size = text_size) +
     scale_fill_identity() +
+    scale_color_identity() +
     scale_alpha_identity() +
     labs(title = title) +
     theme_void() +

R/process_data_helpers.R

 #' @param color_other color for "inactive" values
 #' @param color_missing color for missing values
 #' @param color_fun the function to generate the colors
+#' @param text_color the color for the text inside the tiles,
+#'         defaults to white/black depending on tile color
 #' @param ...
 #'
 #' @return the processed data_frame with a new column .color
 add_color <- function(x, ids, by,
                       color_header = "#737373", color_other = "#d0d0d0",
                       color_missing = "#ffffff",
-                      color_fun = scales::brewer_pal(type = "qual", "Set1"), ...) {
+                      color_fun = scales::brewer_pal(type = "qual", "Set1"),
+                      text_color = NA, ...) {
   colors <- c(color_header, color_fun(length(ids)))
   names(colors) <- c(".header", ids)
 
                       ifelse(.col %in% by,
                              colors[.id],
                              color_other)),
-      .color = ifelse(.id == ".header", color_header, .color))
+      .color = ifelse(.id == ".header", color_header, .color),
+      .textcolor = text_color)
+
+  if (is.na(text_color))
+    res <- res %>% mutate(.textcolor = set_text_color(.color))
+
   return(res)
 }
+
+set_text_color <- function(a) ifelse(mean(col2rgb(a)) > 127, "black", "white")

man/add_color.Rd

 \usage{
 add_color(x, ids, by, color_header = "#737373",
   color_other = "#d0d0d0", color_missing = "#ffffff",
-  color_fun = scales::brewer_pal(type = "qual", "Set1"), ...)
+  color_fun = scales::brewer_pal(type = "qual", "Set1"),
+  text_color = NA, ...)
 }
 \arguments{
 \item{x}{a processed data_frame}
 
 \item{color_fun}{the function to generate the colors}
 
+\item{text_color}{the color for the text inside the tiles,
+defaults to white/black depending on tile color}
+
 \item{...}{}
 }
 \value{