Reactive（）不允许有条件的renderPlot着色

Question

我的问题似乎并不复杂，但我相信闪亮包中的反应（）会阻止我在类型中添加条件颜色=＆＃34; l＆＃34;我的renderPlot（）中的行。

library(shiny)
library(ggplot2)

# Define server logic for random distribution application

shinyServer(function(input, output) {

  sliderValues <- reactive ({
    #compose data frame
    ws<- as.numeric  (c(0:input$sws))
    df<-data.frame(
      WindSpeed = as.numeric  (c(ws)
      ),
      CBH = as.numeric (c(input$sCBH)
      ),
      FFMC = as.numeric (c(input$sFFMC)
      ),
      DC = as.numeric  (c(input$sDC)
      ),
      PCFI = as.numeric  (c((exp(-66.62+(-0.993*input$sCBH)+(0.568*ws)+(0.671*input$sFFMC)+(0.018*input$sDC)))/(1+(exp(-66.62+(-0.993*input$sCBH)+(0.568*ws)+(0.671*input$sFFMC)+(0.018*input$sDC)))))
      )

    )

  })

  #Show the values using an HTML table
  output$summary <- renderPlot ({
    plot(sliderValues()$WindSpeed, sliderValues()$PCFI, col =ifelse(sliderValues()$PCFI <0.5, 'green', 'red'),  type="l", lty = 2, ylim = c(0,1), xlab = "Windspeed 10 km/hr", ylab = "Probability of Crown Fire Initiation (%)")
  })  

  output$values <- renderTable({
    sliderValues()


  })

})