小工具不导出情节

时间:2017-03-02 11:07:52

标签: r shiny

我在RStudio中创建了一个miniUI应用程序,它可以绘制用户可以导出某种格式(如pdf或png)的图表。不幸的是,当我使用Shiny Gadget时,导出功能似乎有问题。

是否有解决问题的已知解决方案?

这是一个小例子:

library(shiny)
library(miniUI)

ui <- miniPage(
    gadgetTitleBar("Sample Gadget"),
    miniContentPanel(
      plotOutput("testPlot", height = "100%"),
      downloadButton('downloadPlot', 'download button')
    )
)

server <- function(input, output, session) {

    plotInput <-  function(){
        plot(mtcars)
    }

    output$testPlot  <- renderPlot({
        print(plotInput())
    })

    output$downloadPlot <- downloadHandler(
        filename = function() { paste("export", '.png', sep='') },
            content = function(file) {
                png(file,
                    bg="white",
                    type="cairo",
                    units="in", 
                    width=10, 
                    height=8, 
                    pointsize=12, 
                    res=180)
                par(mar=c(0,0,0,0), xaxs = "i", yaxs = "i")
                print(plotInput())
                dev.off()
    })
}

runGadget(shinyApp(ui, server))

我注意到当我在外部模式下运行应用程序时:

runGadget(shinyApp(ui, server), viewer = browserViewer())

它工作正常,但我更喜欢在对话模式下使用。

1 个答案:

答案 0 :(得分:0)

最后我发现了这个问题:

Microsoft R Open(3.3.2)可能存在问题。当尝试从MRAN安装最新的闪亮包时它只安装'shiny_0.14.1.zip'

我用R 3.3.2尝试过,一切看起来都很好。

MRO 3.3.2:

Installing package into ‘C:/Users/tarkomatas/Documents/R/win-library/3.3’
(as ‘lib’ is unspecified)
trying URL 'https://mran.revolutionanalytics.com/snapshot/2016-11-01/bin/windows/contrib/3.3/shiny_0.14.1.zip'
Content type 'application/zip' length 2649191 bytes (2.5 MB)
downloaded 2.5 MB

R 3.3.2:

Installing package into ‘C:/Users/tarkomatas/Documents/R/win-library/3.3’
(as ‘lib’ is unspecified)
trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.3/shiny_1.0.0.zip'
Content type 'application/zip' length 2745865 bytes (2.6 MB)
downloaded 2.6 MB

奇怪的问题......