renderPlot cannot displayed Japanese multibyte characters

[manabet]

Hi, we tried to display Japanese characters into renderPlot title or axis labels. But it didn't work. Only Japanese characters were missing in strings like below.

But when we saved this figure as png file in server function, the Japanese character was displayed successfully.
(so renderImage and imageOutput did work)

So we think this error is based on problem related to base 64 transfer. Do you have any idea for this problem?

Thank you for your help. Manabe

[wch]

The problem likely is related to a locale issue, not base64 conversion. Can you supply a reproducible example app?

[manabet]

@wch Thank you for your reply.

Our environment:

• Ubuntu 16.04
• R version: 3.4.3 (2017-11-30) -- "Kite-Eating Tree"
• shiny: 1.0.5
• Shiny-server: 1.5.6.875
• Node.js: 6.10.3

We already installed IPA gothic fonts ttf file which is one of Japanese fonts.

Sample code

library(extrafont)
library(ggplot2)

ui <- fluidPage(
   # App title ----
   titlePanel("Hello Shiny!"),

   # Sidebar layout with input and output definitions ----
   sidebarLayout(
   # Sidebar panel for inputs ----
     sidebarPanel(
       # Input: Slider for the number of bins ----

       sliderInput(inputId = "bins",
                   label = "Number of bins:",
                   min = 1,
                   max = 50,
                   value = 30)
      ),
      # Main panel for displaying outputs ----

      mainPanel(
        # Output: Histogram ----
        plotOutput(outputId = "distPlot")
      )
    )
)

server <- function(input, output) {
       output$distPlot <- renderPlot({

           x <- faithful$waiting
           bins <- seq(min(x), max(x), length.out = input$bins + 1)

           hist(x, breaks = bins, col = "#75AADB", border = "white",
                xlab = "Waiting time to next eruption (in mins)",
                main = "Histogram of 待ち times")
       })
}

shinyApp(ui, server)

Regards