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116 lines
4.8 KiB
116 lines
4.8 KiB
#' Create a new ggplot-based "statebin" chart for USA states (manually colored)
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#'
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#' \code{statebins()} creates "statebin" charts in the style of \url{http://bit.ly/statebins}
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#'
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#' This version uses manual colors (i.e. pass in a column that defines the color per-state)
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#'
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#' The function minimally expects the caller to pass in a data frame that:
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#'
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#' \itemize{
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#' \item has one column of all state abbreviationis (all caps, including \code{DC} &
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#' \code{PR} or a column of state names (standard capitalization) named \code{state}
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#' \item has another column of colors named \code{color}
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#' }
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#'
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#' Doing so will create a "statebin" chart with the colors specified as a ggplot2 object.
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#'
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#' You can use a different column for the state names and colors by changing \code{state_col}
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#' and \code{color_col} accordingly.
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#'
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#' To add a title, change \code{plot_title} to anything but an empty atomic string vector (i.e. \code{""})
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#' and set \code{title_position} to "\code{top}" or "\code{bottom}". Choosing "\code{bottom}"
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#' will cause \code{statebins} to use \code{arrangeGrob} to position the title via \code{sub} and
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#' return a frame grob instead of a ggplot2 object.
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#'
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#' @param state_data data frame of states and values to plot
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#' @param state_col column name in \code{state_data} that has the states. no duplicates
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#' and can be names (e.g. "\code{Maine}") or abbreviatons (e.g. "\code{ME}")
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#' @param color_col column name in \code{state_data} that holds the colors to be used
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#' @param text_color default "\code{black}"
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#' @param font_size font size (default = \code{3})
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#' @param state_border_col default "\code{white}" - this creates the "spaces" between boxes
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#' @param labels labels for the legend (should be the same number as distinct colors in
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#' \code{color_col}); \code{NULL} == no labels/legend
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#' @param legend_title title for the legend
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#' @param legend_position "\code{none}", "\code{top}", "\code{left}", "\code{right}" or
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#' "\code{bottom}" (defaults to "\code{top}")
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#' @param plot_title title for the plot
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#' @param title_position where to put the title ("\code{bottom}" or "\code{top}" or ""
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#' for none); if "\code{bottom}", you get back a grob vs a ggplot object
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#' @return ggplot2 object or grob
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#' @export
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#' @examples
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#' \dontrun{
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#' library(httr)
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#' library(dplyr)
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#' election_2012 <-
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#' GET("https://raw.githubusercontent.com/hrbrmstr/statebins/master/tmp/election2012.csv")
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#' results <- read.csv(textConnection(content(election_2012, as="text")),
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#' header=TRUE, stringsAsFactors=FALSE)
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#' results <- results %>%
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#' mutate(color=ifelse(is.na(Obama), "#2166ac", "#b2182b")) %>%
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#' select(state, color)
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#' results %>%
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#' statebins_manual(font_size=4,
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#' text_color = "white", labels=c("Romney", "Obama"),
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#' legend_position="right", legend_title="Winner")
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#' }
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statebins_manual <- function(state_data, state_col="state", color_col="color",
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text_color="black", font_size=3,
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state_border_col="white", labels=NULL,
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legend_title="Legend", legend_position="top",
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plot_title="", title_position="bottom") {
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if (!title_position %in% c("", "top", "bottom")) {
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stop("'title_position' must be either blank, 'top' or 'bottom'")
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}
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state_data <- data.frame(state_data, stringsAsFactors=FALSE)
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if (max(nchar(state_data[,state_col])) == 2) {
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merge.x <- "abbrev"
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} else {
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merge.x <- "state"
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}
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state_data <- validate_states(state_data, state_col, merge.x)
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st.dat <- merge(state_coords, state_data, by.x=merge.x, by.y=state_col, all.y=TRUE)
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gg <- ggplot(st.dat, aes_string(x="col", y="row", label="abbrev"))
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gg <- gg + geom_tile(aes_string(fill="color"))
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gg <- gg + geom_tile(color=state_border_col, aes_string(fill="color"),
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size=2, show.legend=FALSE)
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gg <- gg + geom_text(color=text_color, size=font_size)
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gg <- gg + scale_y_reverse()
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if (is.null(labels)) {
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gg <- gg + scale_fill_manual(values=unique(st.dat[,color_col]))
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legend_position = "none"
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} else {
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gg <- gg + scale_fill_manual(values=unique(st.dat[,color_col]),
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labels=labels, name=legend_title)
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}
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gg <- gg + coord_equal()
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gg <- gg + labs(x=NULL, y=NULL, title=NULL)
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gg <- gg + theme_bw()
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gg <- gg + theme(legend.position=legend_position)
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gg <- gg + theme(panel.border=element_blank())
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gg <- gg + theme(panel.grid=element_blank())
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gg <- gg + theme(panel.background=element_blank())
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gg <- gg + theme(axis.ticks=element_blank())
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gg <- gg + theme(axis.text=element_blank())
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if (plot_title != "") {
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if (title_position == "bottom") {
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gg <- gg + labs(x=plot_title)
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gg <- gg + theme(axis.text.x=element_text(hjust=0.5, size=ggplot2::rel(1.2), angle=0))
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} else {
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gg <- gg + ggtitle(plot_title)
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}
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}
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return(gg)
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}
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