To pass specifications, you need to complete all questions, especially the final couple questions. You should have a functional animation with a working “play” button and some customized options. The animated line document on Canvas may be useful as another reference for animations using Plotly in R.

Note the use of the p_load() function from the pacman package!

knitr::opts_chunk$set(echo = TRUE)
pacman::p_load(plotly, gapminder)

Q1

Load the gapminder dataset into your R environment and take a look at it. Note the location of different variables and include a summary of the average and maximum GDP by continent.

library(dplyr)
## 
## Attaching package: 'dplyr'
## The following objects are masked from 'package:stats':
## 
##     filter, lag
## The following objects are masked from 'package:base':
## 
##     intersect, setdiff, setequal, union
library(ggplot2)
data("gapminder")
head(gapminder)
## # A tibble: 6 × 6
##   country     continent  year lifeExp      pop gdpPercap
##   <fct>       <fct>     <int>   <dbl>    <int>     <dbl>
## 1 Afghanistan Asia       1952    28.8  8425333      779.
## 2 Afghanistan Asia       1957    30.3  9240934      821.
## 3 Afghanistan Asia       1962    32.0 10267083      853.
## 4 Afghanistan Asia       1967    34.0 11537966      836.
## 5 Afghanistan Asia       1972    36.1 13079460      740.
## 6 Afghanistan Asia       1977    38.4 14880372      786.
data <- gapminder %>%
  group_by(continent) %>%
  summarize(
    avg_gdpPercap = mean(gdpPercap, na.rm = TRUE),
    max_gdpPercap = max(gdpPercap, na.rm = TRUE)
  )

data
## # A tibble: 5 × 3
##   continent avg_gdpPercap max_gdpPercap
##   <fct>             <dbl>         <dbl>
## 1 Africa            2194.        21951.
## 2 Americas          7136.        42952.
## 3 Asia              7902.       113523.
## 4 Europe           14469.        49357.
## 5 Oceania          18622.        34435.

Q2

Using plotly, create a static bubble chart of the gapminder data. Map GDP to the x axis, life expectancy to the Y axis, and population to the size of the bubbles. Each bubble’s color should be based on the region of that nation. Hint: If size is not working properly for you, you may want to use: marker = list(sizemode = "diameter"))

gapminder_2007 <- gapminder

plot_ly(gapminder_2007, x = ~gdpPercap, y = ~lifeExp, color = ~continent,
        size = ~pop,
        hoverinfo = "text", type = 'scatter', mode = "markers") %>%
  layout(title = "Life Expectancy vs. GDP per Capita",
         xaxis = list(title = "GDP per Capita"),
         yaxis = list(title = "Life Expectancy"))

Note here that the plot looks pretty messy because all the years are present on the plot. It would be nice to see the dots by country one year at a time, right?

Q3

Create a new plotly object that is similar to the previous one, but includes animation. This is as easy as adding frame to your plot_ly command and specifying the varable that should determine the frame.

# Code goes here

#Uncomment the line below and modify as needed!
#animated_plot <- plot_ly(...)
df <- gapminder_2007
fig <- df %>%
  plot_ly(
    x = ~gdpPercap, y = ~lifeExp,color = ~continent, 
    size = ~pop, frame = ~year, text = ~country, 
    hoverinfo = "text", type = 'scatter', mode = 'markers'
  )
animated_plot <- fig %>% layout(xaxis = list( type = "log") )

animated_plot

Q4

Try adding a few options to alter your animation lightly. As long as you’ve created your plot correctly, all you need to do here is uncomment the code, run the chunk, and explain what each part did.

#Uncomment the lines below to see the updated animation. 
animated_chart <- animated_plot %>% 
    animation_opts(frame = 100,  # This sets the duration (in milliseconds) of each frame in the animation
                  redraw = TRUE, # This forces the chart to redraw with each frame update
                easing = "linear")# This defines the pacing of the animation
                  #autoplay = TRUE # This option (if uncommented) would start the animation automatically without requiring you to click the "play" button)
animated_chart

Q5

Now, let’s add a button to pause the animation. You should spend a bit of time looking at this code and understanding what it does, then try to move the button to a place that makes more sense.

interactive_chart <- animated_chart %>% layout(
   updatemenus = list(
     list(
       type = "buttons",
       showactive = FALSE,
       x = 0,  
       y = -0.3,  
       buttons = list(
         
         list(
           label = "Pause",
           method = "animate",
           args = list(NULL, list(frame = list(duration = 0, 
                                               redraw = TRUE), 
                                  mode = "immediate"))
         )
       )
     )
   )
 )
 interactive_chart

Q6

Add a title, axis labels, any other important annotations to the plot. This could include adding hover text or other elements.

interactive_chart <- animated_chart %>% layout(
  title = "GDP per Capita vs Life Expectancy",
    xaxis = list(title = "GDP per Capita"),
    yaxis = list(title = "Life Expectancy"),
    showlegend = TRUE,
   updatemenus = list(
     list(
       type = "buttons",
       showactive = FALSE,
       x = 0,  
       y = -0.3,  
       buttons = list(
         
         list(
           label = "Pause",
           method = "animate",
           args = list(NULL, list(frame = list(duration = 0, 
                                               redraw = TRUE), 
                                  mode = "immediate"))
         )
       )
     )
   )
 )

 interactive_chart

Q7

Practice publishing your final plot to Rpubs (or another location of your choice) and include the link in your submission. https://rpubs.com/HuaruiLiu/1243013