Gantt Charts in ggplot2

How to make Gantt Charts in ggplot2 with Plotly.

New to Plotly?

Plotly is a free and open-source graphing library for R. We recommend you read our Getting Started guide for the latest installation or upgrade instructions, then move on to our Plotly Fundamentals tutorials or dive straight in to some Basic Charts tutorials.

Gantt chart

library(plotly)
require(reshape2)
require(ggplot2)


tasks <- c("Write introduction", "Parse citation data",
           "Construct data timeline",
           "Write methods", "Model formulation", 
           "Model selection", "Write results", "Write discussion",
           "Write abstract and editing",

           "Write introduction", "Write introduction", "Write results")

# Compile dataframe of task names, and respective start and end dates.
dfr <- data.frame(
  name = factor(tasks, levels = tasks[1:9]),
  start.date = as.Date(c("2018-04-09", "2018-04-09", "2018-04-16",
                         "2018-04-30", "2018-04-16", "2018-05-21",
                         "2018-06-04", "2018-07-02", "2018-07-30",

                         "2018-05-15", "2018-06-03", "2018-07-25"
                         )),
  end.date = as.Date(c("2018-04-30", "2018-04-20", "2018-05-18",
                       "2018-06-01", "2018-05-18", "2018-06-01",
                       "2018-06-29", "2018-07-27", "2018-08-31",

                       "2018-05-29", "2018-06-20", "2018-08-15")),
  flag = c(0, 0, 1, 
           1, 1, 1,
           0, 0, 1, 
           1, 0, 1)
)

# Merge start and end dates into durations.
mdfr <- melt(dfr, measure.vars = c("start.date", "end.date"))

p <- ggplot(dfr) +
      geom_linerange(aes(y = name, 
                         xmin = start.date,
                         xmax = end.date,
                         colour = as.factor(flag)),
                     size = I(5)) +
      theme_minimal()


ggplotly(p)

What About Dash?

Dash for R is an open-source framework for building analytical applications, with no Javascript required, and it is tightly integrated with the Plotly graphing library.

Learn about how to install Dash for R at https://dashr.plot.ly/installation.

Everywhere in this page that you see fig, you can display the same figure in a Dash for R application by passing it to the figure argument of the Graph component from the built-in dashCoreComponents package like this:

library(plotly)

fig <- plot_ly() 
# fig <- fig %>% add_trace( ... )
# fig <- fig %>% layout( ... ) 

library(dash)
library(dashCoreComponents)
library(dashHtmlComponents)

app <- Dash$new()
app$layout(
    htmlDiv(
        list(
            dccGraph(figure=fig) 
        )
     )
)

app$run_server(debug=TRUE, dev_tools_hot_reload=FALSE)