问题描述
您将在下面找到我尝试学习 Shiny 的第一个项目。 我正在尝试实现以下想法:
到目前为止,我已经首先实现了 3,但我真的很难为接下来的两个找到解决方案。 任何人都可以指导我如何做吗?
library(shiny)
library(shinythemes)
library(leaflet)
df <- data.frame(longitude = 26,latitude = 39)
# Define UI for slider app ----
ui <- fluidPage(
#Navbar structure for UI
navbarPage("SAR Model",theme = shinytheme("united"),tabPanel("Toblers Function",titlePanel("Toblers Function - Insert slope"),sidebarLayout(
sidebarPanel(
# Input: Slope interval with step value ----
sliderInput("slope","Slope:",min = -0.60,max = 0.50,value = 0.0,step = 0.01)),# Main panel for displaying outputs ----
mainPanel(
# Output: Table summarizing the values entered ----
tableOutput("Values"),tableOutput("slope")))),tabPanel("Map",titlePanel("SAR MAP - insert a point"),mainPanel(leafletoutput("map",width = "100%",height = "700"))),tabPanel("Data",titlePanel("Data Summury"),dataTableOutput("table"))))
server <- function(input,output) {
# Reactive expression to create data frame off input value ----
sliderValues <- reactive({
data.frame(
Name = c("Slope"),Value = as.character(c(input$slope)),stringsAsFactors = TRUE)
})
# Show the values in an HTML table ----
output$values <- renderTable({
sliderValues()
})
output$slope <- renderText({
paste0("The speed is ",6*exp(-3.5*abs(input$slope+0.05)),"Km/h")
})
output$map <- renderLeaflet({
leaflet() %>%addTiles()
})
df_r <- reactiveValues(new_data = df)
# reactive list with id of added markers
clicked_markers <- reactiveValues(clickedMarker = NULL)
observeEvent(input$map_click,{
click <- input$map_click
click_lat <- click$lat
click_long <- click$lng
clicked_markers$clickedMarker <- c(clicked_markers$clickedMarker,1)
id <- length(clicked_markers$clickedMarker)
# Add the marker to the map
leafletProxy('map') %>%
addMarkers(lng = click_long,lat = click_lat,group = 'new_circles',options = markerOptions(draggable = TRUE),layerId = id)
# add new point to dataframe
df_r$new_data <- rbind(rep(NA,ncol(df)),df_r$new_data)
df_r$new_data$longitude[1] <- click_long
df_r$new_data$latitude[1] <- click_lat
})
observeEvent(input$map_marker_mouSEOut,{
click_marker <- input$map_marker_mouSEOut
id <- input$map_marker_mouSEOut$id
if(click_marker$lng != df_r$new_data$longitude[id] | click_marker$lat != df_r$new_data$latitude[id]){ # why is this always true??
df_r$new_data$longitude[id] <- click_marker$lng
df_r$new_data$latitude[id] <- click_marker$lat
}
})
output$table <- renderDataTable({df_r$new_data})
}
shinyApp(ui = ui,server = server)
解决方法
暂无找到可以解决该程序问题的有效方法,小编努力寻找整理中!
如果你已经找到好的解决方法,欢迎将解决方案带上本链接一起发送给小编。
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