moved barplot_colour_function.R to functions

scripts/functions/barplot_colour_function.R

@@ -0,0 +1,27 @@
+#########################################################
+# 1b: Define function: coloured barplot by subgroup
+# LINK: https://stackoverflow.com/questions/49818271/stacked-barplot-with-colour-gradients-for-each-bar
+#########################################################
+
+ColourPalleteMulti <- function(df, group, subgroup){
+  
+  # Find how many colour categories to create and the number of colours in each
+  categories <- aggregate(as.formula(paste(subgroup, group, sep="~" ))
+                          , df
+                          , function(x) length(unique(x)))
+  #  return(categories) }
+  
+  category.start <- (scales::hue_pal(l = 100)(nrow(categories))) # Set the top of the colour pallete
+  
+  category.end  <- (scales::hue_pal(l = 40)(nrow(categories))) # set the bottom
+  
+  #return(category.start); return(category.end)}
+  
+  # Build Colour pallette
+  colours <- unlist(lapply(1:nrow(categories),
+                           function(i){
+                             colorRampPalette(colors = c(category.start[i]
+                                                         , category.end[i]))(categories[i,2])}))
+  return(colours)
+}
+#########################################################