Legend for colors in a scatter plot

Useful for creating common color legend for multiple scatter plots

get_color_legend(cell_type, my_color_palette, ncol = NULL,
  legend.position = "right", legend.title = "Cell type", ...)

Arguments

cell_type	factor or vector of the batch labels
my_color_palette	a vector of colors e.g., c("red","blue","green") or hex color codes