Radar charts in R using Plotly

June 16, 2016
By

(This article was first published on R – Modern Data, and kindly contributed to R-bloggers)

This post is inspired by this question on Stack Overflow..

We’ll show how to create excel style Radar Charts in R using the plotly package.

library(plotly)
library(dplyr)

# Read in data
df <- read.csv("https://cdn.rawgit.com/plotly/datasets/master/Consumer%20Complaints.csv", 
               stringsAsFactors = F, check.names = F)

# Melt
df <- reshape2::melt(df, id = c("Company"))
colnames(df) <- c("Company", "Complaint", "Percent")

getPolarCoord <- function(r, matrix = F, na = F){
  # Get starting angle and angle increments
  theta <- 0
  dtheta <- 360 / length(r)
  dtheta <- (pi / 180) * dtheta  # in radians
  
  # Get polar coordinates
  x <- c()
  y <- c()
  
  for(i in 1:length(r)){
    
    x <- c(x, r[i] * cos(theta))
    y <- c(y, r[i] * sin(theta))
    
    theta <- theta + dtheta
  }
  
  x[length(x) + 1] <- x[1]
  y[length(y) + 1] <- y[1]
  
  if(na == T){
    x[length(x) + 1] <- NA
    y[length(y) + 1] <- NA
  }
  
  
  if(matrix == T){
    return(cbind(x, y))
  }else{
    return(list(x = x, 
                y = y))
  }
  
}

coords <- by(df, df[,"Complaint"], function(r){
  x <- getPolarCoord(r[,3])
  x <- cbind(x$x, x$y)
  x <- data.frame(rbind(r, r[1,]), x = x[,1], y = x[,2])
  return(x)
})

coords <- rbind(coords[[1]], coords[[2]], coords[[3]])
df <- data.frame(coords, txt = paste(coords$Company, "
", coords$Complaint, ":", round(coords$Percent*100, 2), "%")) # Plot smooth <- 1 bgcolor <- "white" p <- plot_ly(data = df, x = x, y = y, mode = "lines", group = Complaint, fill = "toself", line = list(smoothing = smooth, shape = "spline"), hoverinfo = "text", text = txt) %>% add_trace(data = df, x = x, y = y, mode = "markers", marker = list(color = "white", size = 10, line = list(width = 2)), hoverinfo = "none", showlegend = F) %>% layout(xaxis = list(title = "", showgrid = F, zeroline = F, showticklabels = F, domain = c(0.02, 0.48)), yaxis = list(title = "", showgrid = F, zeroline = F, showticklabels = F, domain = c(0, 0.92)), font = list(family = "serif", size = 15), legend = list(x = 0.55, y = 0.9, bgcolor = "transparent"), plot_bgcolor = bgcolor, paper_bgcolor = bgcolor) # Add grids grid <- rbind(getPolarCoord(rep(0.05, 50), matrix = T, na = T), getPolarCoord(rep(0.10, 80), matrix = T, na = T), getPolarCoord(rep(0.15, 150), matrix = T, na = T), getPolarCoord(rep(0.20, 170), matrix = T, na = T), getPolarCoord(rep(0.25, 200), matrix = T, na = T)) grid <- as.data.frame(grid) p <- add_trace(p, data = grid, x = x, y = y, mode = "lines", line = list(color = "#57788e", dash = "4px", width = 1), showlegend = F, hoverinfo = "none") inner <- getPolarCoord(rep(0.06, 5)) outer <- getPolarCoord(rep(0.27, 5)) x = t(cbind(inner$x, outer$x)) y = t(cbind(inner$y, outer$y)) x <- as.numeric(apply(x, 2, function(vec){ return(c(vec, NA)) })) y <- as.numeric(apply(y, 2, function(vec){ return(c(vec, NA)) })) linegrid <- data.frame(x = x, y = y) p <- add_trace(p, data = linegrid, x = x, y = y, mode = "lines", line = list(color = "#57788e", dash = "4px", width = 1), showlegend = F, hoverinfo = "none") # Add text banks <- c("Bank of
America", "Wells Fargo
&Company", "JP Morgan
Chase & Co.", "CitiBank", "Capital One") labels <- paste0("", banks, "") p <- add_trace(p, data = getPolarCoord(rep(0.28, 5)), x = x, y = y, mode = "text", text = labels, showlegend = F, hoverinfo = "none", textfont = list(family = "serif", color = "#808080")) # Add a gray circle p <- add_trace(p, data = getPolarCoord(rep(0.24, 200)), x = x, y = y, fill = "toself", fillcolor = "rgba(200, 200, 200, 0.3)", line = list(color = "transparent"), mode = "lines", hoverinfo = "none", showlegend = F) # Add titles, description etc p <- layout(p, annotations = list( list(xref = "paper", yref = "paper", xanchor = "left", yanchor = "top", x = 0.03, y = 1, showarrow = F, text = "Consumer complaints for five large banks in the U.S.", font = list(family = "serif", size = 25, color = "#4080bf")), list(xref = "paper", yref = "paper", xanchor = "left", yanchor = "top", x = 0.03, y = 0.95, showarrow = F, text = 'Source: Consumer Financial Protection Bureau', font = list(family = "serif", size = 16, color = "#679bcb")), list(xref = "paper", yref = "paper", xanchor = "left", yanchor = "top", x = 0.60, y = 0.20, showarrow = F, align = "left", text = "Complaints received by the Consumer Financial Protection Bureau
regarding financial products and services offered by five large banks in
in the United States expressed as a percentage of total nummber
of complaints.", font = list(family = "arial", size = 12)), list(xref = "paper", yref = "paper", xanchor = "left", yanchor = "top", x = 0.60, y = 0.05, showarrow = F, align = "left", text = 'Click here to go to source', font = list(family = "arial", size = 14)) ), shapes = list( list( xref = "paper", yref = "paper", x0 = 0, x1 = 0.95, y0 = 0, y1 = 1, type = "rect", layer = "above", fillcolor = "rgba(191, 191, 191, 0.1)", line = list(color = "transparent")) )) print(p)

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