title: Cumulative points over year on map with R ggplot2 and ggplotly
body: <p>I am trying to plot new locations opened over each month on a map cumulatively. I am able to create an animation with new locations each month, but not cumulatively. In other words, I want to see the new locations add to the existing ones.</p>
  
  <p>Here is the sample data</p>
  
  <pre><code>DF &lt;- data.frame("latitude" = c(42.29813,41.83280,41.83280,30.24354),
                   "longitude" =c(-71.23154,-72.72642,-72.72642,-81.62098),
                   "month" = c(1,2,3,4))
  </code></pre>
  
  <p>This is what I have tried</p>
  
  <pre><code>usa &lt;- ggplot() +
    borders("usa", colour = "gray85", fill = "gray80") +
    theme_map() 
  
  map &lt;- usa +
     geom_point(aes(x = longitude, y = latitude, cumulative=TRUE,
                   frame=month,stat = 'identity' ),data = DF )
  map
  
  # Generate the Visual and a HTML output
  ggp &lt;- ggplotly(map)%&gt;%
    animation_opts(transition = 0)
  ggp
  </code></pre>
  
  <p>The output does not show locations cumulatively. I want to see all four locations in the end basically.</p>