Disable hover text in plotly with ggplot

Question

I want to partly disable hover text in plotly, limiting it to one dataframe or geom in ggplot. In the case below, I want hover only on the "cities" not the map outline. I've seen a solution in Python, but not R. And how would I control the image size to keep the map dimension right in plotly? The map demo at https://plot.ly/ggplot2/interactive-tooltip/ seems not to care!

library(mapdata)
library(ggplot2)
library(plotly)


Japan <- map_data("world2Hires", region="Japan")

Longitude <- 140
Latitude <- 36.5
df <- cbind.data.frame(Longitude,Latitude)
df$Name <- "Tokyo"
df$Name_2 <- "Tōkyō"



XX <- ggplot() + geom_polygon(data=Japan, aes(x=long, y=lat, group=group), color="black", fill="white", text="") + coord_equal() + geom_point(data=df, aes(x=Longitude, y=Latitude, text=Name), color="green")
XX 
ggplotly(XX)  ##How to get hover text only on df not Japan, and remove "[object Object]" 

XX <- ggplot() + geom_polygon(data=Japan, aes(x=long, y=lat, group=group), color="black", fill="white", text="") + coord_equal() + geom_point(data=df, aes(x=Longitude, y=Latitude, text=Name_2), color="green")
XX 
ggplotly(XX)  ##Non-Ascii text breaks hover

bluefish · Accepted Answer · 2016-05-10 09:08:29Z

3

First I have to admit I don't know about plotly and mapdata packages before reading your question. But these look so useful I started playing around and finally produced something useful.

I think some of your problems arising because you use the ggplotly function and not the direct plot_ly interface, which I did in my solution.

data preparation

library(mapdata)
library(ggplot2)
library(plotly)

Japan <- map_data("world2Hires", region="Japan")
Longitude <- 140
Latitude <- 36.5
df <- cbind.data.frame(Longitude,Latitude)
df$Name <- "Tokyo"
df$Name_2 <- "Tōkyō"

geo object

Here a dummy geo object is prepared. This doesn't draw anything but selects which region of the World to display. Here you could also set up the used projection.

g <- list(
  showland = F,
  coastlinewidth = 0,
  lonaxis = list(
    showgrid = TRUE,
    gridwidth = 0.5,
    range = c(125, 145.8224),
    dtick = 5
  ),
  lataxis = list(
    showgrid = TRUE,
    gridwidth = 0.5,
    range = c(25, 45.52),
    dtick = 5
  )
)

adding data

First create a scattergeo plot with only your point:

p <- plot_ly(data = df,lon = Longitude,lat = Latitude,name="City",
             text =Name_2,type = "scattergeo",mode = "markers")

Then add the cost line and disable hover info (hoverinfo = "none"):

p <- add_trace(data=Japan,lon = long,lat = lat, 
               mode = "lines",group=group,line = list(color=toRGB("black"),width = 0.5),
               type = "scattergeo",  hoverinfo = "none",showlegend = F)

Finally set the layout to the previously defined geo object:

p <- layout(p, geo = g)

Final remarks

https://plot.ly/r/reference/#layout-geo shows what parameters are available for a geo object. https://plot.ly/r/lines-on-maps/ shows a code example with some of them.

For me using Name_2 works fine and I don't know what you mean with "control the image size" you might want to ask different questions for that where you further specify what you want. Good luck!

edited May 10, 2016 at 9:08

answered Dec 6, 2015 at 1:14

bluefish

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6 Comments

Mark R Over a year ago

This works perfectly, although it confirms my sense that plotly is more reliable than ggplotly. Your answer also helped with my question about how to control the image size. It's the height and width parameters within layout()

bluefish Over a year ago

Glad I could help. Did the display issue worked out ?

Mark R Over a year ago

Yes, it works locally and on the remote server. Thanks. Next is integration with Shiny!

user1561393 Over a year ago

Checkout plot.ly/r/reference/#layout-geo for "what exact parameters are available for a geo object" @bluefish

bluefish Over a year ago

Thanks I added it to the answer @user1561393

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