R - Shiny的实时图表

时间：2016-11-04 13:51:04

标签： r highcharts shiny shiny-server

我试图创建一个交互式图表，在闪亮的应用上绘制金融股票数据。我的尝试是不断更新数据，因此图表。我使用名为Highcharter的软件包来管理它。下面显示了服务器部分中的部分代码（getDataIntraday（）接收两个输入并返回更新的xts）。 

getID <- reactive({
  invalidateLater(60000)
  y <- getDataIntraDay(input$text, input$radio)
  return(y)
})

output$plot1 <- renderHighchart({

y <- getID()

highchart() %>% 
  hc_credits(enabled = TRUE,
  hc_exporting(enabled = TRUE)%>%
  hc_add_series_ohlc(y) %>% 
  hc_add_theme(hc_theme_538(colors = c("red", "blue", "green"),
                            chart = list(backgroundColor = "white")))
})

这样做：每隔60秒，图表和数据会自动更新。问题如下：

  1. 更新数据和图表时，不会保留用户确定的缩放。

  2. 图表需要太多秒才能更新自身，因为它计算了所有结构，而不是仅添加最后一根蜡烛。

    3. 是否有某些方法（某些软件包）允许更新图表而不再计算整个函数？或者，至少，除了蜡烛之外，有没有办法修复图表中的所有元素？

1 个答案:

答案 0 :(得分：-2)

您可以尝试通过DataCollection引用我的。

enter image description here 

require('shiny')
require('shinyTime')
#'@ require('rdrop2')
require('magrittr')
require('plyr')
require('dplyr')
require('stringr')
require('data.table')
#'@ require('rvest')
require('quantmod')
require('TFX')
require('lubridate')
require('ggplot2')
require('DT')

#'@ drop_auth()
## email : scibrokes_demo@gmail.com
## pass : trader888
#
# https://github.com/karthik/rdrop2
#
#'@ token <- drop_auth()
#'@ saveRDS(token, "droptoken.rds")
# Upload droptoken to your server
# ******** WARNING ********
# Losing this file will give anyone 
# complete control of your Dropbox account
# You can then revoke the rdrop2 app from your
# dropbox account and start over.
# ******** WARNING ********
# read it back with readRDS
#'@ token <- readRDS("droptoken.rds")
# Then pass the token to each drop_ function
#'@ drop_acc(dtoken = token)
#'@ token <<- readRDS("droptoken.rds")
# Then pass the token to each drop_ function
#'@ drop_acc(dtoken = token)

# === Data =====================================================
Sys.setenv(TZ = 'Asia/Tokyo')
zones <- attr(as.POSIXlt(now('Asia/Tokyo')), 'tzone')
zone <- ifelse(zones[[1]] == '', paste(zones[-1], collapse = '/'), zones[[1]])

# === UI =====================================================
ui <- shinyUI(fluidPage(

  titlePanel(
    tags$a(href='https://github.com/scibrokes', target='_blank', 
           tags$img(height = '120px', alt='HFT', #align='right', 
                    src='https://raw.githubusercontent.com/scibrokes/real-time-fxcm/master/www/HFT.jpg'))), 
  pageWithSidebar(
    mainPanel(
      tabsetPanel(
        tabPanel('Data Price', 
                 tabsetPanel(
                   tabPanel('Board', 
                            h3('Real Time Board'), 
                            p(strong(paste0('Current time (', zone, '):')),
                              textOutput('currentTime')),
                            br(), 
                            p(strong('Latest FX Quotes:'),
                              tableOutput('fxdata'), 
                              checkboxInput('pause', 'Pause updates', FALSE))), 
                   tabPanel('Chart', 
                            h3('Real Time Chart'), 
                            p(strong(paste0('Current time (', zone, '):')),
                              textOutput('currentTime2')),
                            br(), 
                            plotOutput("plotPrice")#, 
                            #'@ tags$hr(),
                            #'@ plotOutput("plotAskPrice")
                            ), 
                   tabPanel('Data', 
                            h3('Data Download'), 
                            p(strong(paste0('Current time (', zone, '):')),
                              textOutput('currentTime3')), 
                            p('The time zone of data in GMT, Current time (GMT) :', 
                              textOutput('currentTime4')), 
                            dataTableOutput('fxDataTable'), 
                            p(strong('Refresh'), 'button will collect the latest dataset ', 
                              '(time unit in seconds).'), 
                            p('Please becareful, once you click on', 
                              strong('Reset'), 'button, ', 
                              'all data will be lost. Kindly download the dataset ', 
                              'as csv format prior to reset it.'), 
                            actionButton('refresh', 'Refresh', class = 'btn-primary'), 
                            downloadButton('downloadData', 'Download'), 
                            actionButton('reset', 'Reset', class = 'btn-danger')))), 

        tabPanel('Appendix', 
                 tabsetPanel(
                   tabPanel('Reference', 
                            h3('Speech'), 
                            p('I try to refer to the idea from below reference to create this web ', 
                              'application for data collection.'), 
                            p(HTML("<a href='https://beta.rstudioconnect.com/content/3138/'>Q1App2</a>"), 
                              '(', strong('Q1App2'), 'inside 2nd reference link at below', 
                              strong('Reference'), 'tab) for algorithmic trading. Kindly browse over', 
                              HTML("<a href='https://github.com/scibrokes/real-time-fxcm'>Real Time FXCM</a>"), 
                              'for more information about high frequency algorithmic trading.'), 
                            br(), 
                            h3('Reference'), 
                            p('01. ', HTML("<a href='https://github.com/cran/TFX'>TFX r package</a>")), 
                            p('02. ', HTML("<a href='https://www.fxcmapps.com/apps/basic-historical-data-downloader/'>Basic Historical Data Downloader</a>")), 
                            p('03. ', HTML("<a href='https://github.com/englianhu/binary.com-interview-question'>binary.com : Job Application - Quantitative Analyst</a>"))), 

                   tabPanel('Author', 
                            h3('Author'), 
                            tags$iframe(src = 'https://beta.rstudioconnect.com/content/3091/ryo-eng.html', 
                                        height = 800, width = '100%', frameborder = 0)))))), 
    br(), 
    p('Powered by - Copyright® Intellectual Property Rights of ', 
      tags$a(href='http://www.scibrokes.com', target='_blank', 
             tags$img(height = '20px', alt='scibrokes', #align='right', 
                      src='https://raw.githubusercontent.com/scibrokes/betting-strategy-and-model-validation/master/regressionApps/oda-army.jpg')), 
      HTML("<a href='http://www.scibrokes.com'>Scibrokes®</a>")))))

# === Server =====================================================
server <- shinyServer(function(input, output, session){

  output$currentTime <- renderText({
    # Forces invalidation in 1000 milliseconds
    invalidateLater(1000, session)
    as.character(now('Asia/Tokyo'))
  })

  output$currentTime2 <- renderText({
    # Forces invalidation in 1000 milliseconds
    invalidateLater(1000, session)
    as.character(now('Asia/Tokyo'))
  })

  output$currentTime3 <- renderText({
    # Forces invalidation in 1000 milliseconds
    invalidateLater(1000, session)
    as.character(now('Asia/Tokyo'))
  })

  output$currentTime4 <- renderText({
    # Forces invalidation in 1000 milliseconds
    invalidateLater(1000, session)
    as.character(now('GMT'))
  })

  fetchData <- reactive({
    if (!input$pause)
      invalidateLater(750)
    qtf <- QueryTrueFX()
    qtf %<>% mutate(TimeStamp = as.character(TimeStamp))
    names(qtf)[6] <- 'TimeStamp (GMT)'
    return(qtf)
  })

  output$fxdata <- renderTable({
    update_data()

    fetchData()
  }, digits = 5, row.names = FALSE)

  # Function to get new observations
  get_new_data <- function(){
    readLines('http://webrates.truefx.com/rates/connect.html')
    }

  ## ----------------- Start fxData ---------------------------
  # Initialize fxData
  fxData <<- get_new_data()

  # Function to update fxData, latest data will be showing upside.
  update_data <- function(){
    fxData <<- rbind(fxData, get_new_data())#  %>% unique
    saveRDS(fxData, paste0(str_replace_all(now('GMT'), ':', 'T'), 'GMT.rds'))
    }

  output$plotPrice <- renderPlot({
    invalidateLater(1000, session)
    #update_data()

    if(any(file.exists(paste0(dir(pattern = '.rds'))))) {
      realPlot <<- llply(dir(pattern = '.rds'), readRDS)
      realPlot <<- do.call(rbind, realPlot) %>% unique
      realPlot <<- ldply(realPlot, ParseTrueFX) %>% unique %>% 
        filter(Symbol == 'USD/JPY')
    }

    if(nrow(realPlot) > 10) {

      ggplot(tail(realPlot, 10), aes(TimeStamp)) + 
        geom_line(aes(y = Bid.Price, colour = 'Bid.Price')) + 
        geom_line(aes(y = Ask.Price, colour = 'Ask.Price')) + 
        ggtitle('Real Time USD/JPY')

    } else {

      ggplot(realPlot, aes(TimeStamp)) + 
        geom_line(aes(y = Bid.Price, colour = 'Bid.Price')) + 
        geom_line(aes(y = Ask.Price, colour = 'Ask.Price')) + 
        ggtitle('Real Time USD/JPY')
    }
    })

  #'@ output$plotAskPrice <- renderPlot({
  #'@   invalidateLater(1000, session)
    #'@ update_data()
  #'@   
  #'@   dt <- terms()
  #'@   if(nrow(dt) > 40) {
  #'@     ggplot(data = tail(dt, 40), aes(x = TimeStamp, y = Ask.Price, 
  #'@                           group = Symbol, colour = Symbol)) +
  #'@       geom_line() + geom_point( size = 4, shape = 21, fill = 'white') + 
  #'@       ggtitle('Real Time Graph 2 : Forex Ask Price')
  #'@     
  #'@   } else {
  #'@     ggplot(data = dt, aes(x = TimeStamp, y = Ask.Price, 
  #'@                           group = Symbol, colour = Symbol)) +
  #'@       geom_line() + geom_point( size = 4, shape = 21, fill = 'white') + 
  #'@       ggtitle('Real Time Graph 2 : Forex Ask Price')
  #'@   }
  #'@ })
  ## ------------------ End fxData ----------------------------

  terms <- reactive({
    input$refresh

    if(any(file.exists(paste0(dir(pattern = '.rds'))))) {
      realData <<- llply(dir(pattern = '.rds'), readRDS)
      realData <<- do.call(rbind, realData) %>% unique
      realData <<- ldply(realData, ParseTrueFX) %>% unique
    }
  })

  # Downloadable csv
  output$downloadData <- downloadHandler(
    filename = function() {
      paste('fxData.csv', sep = '')
    },
    content = function(file) {
      fwrite(terms(), file, row.names = FALSE)
    }
  )

  observe({
    if(input$reset){
      do.call(file.remove, list(dir(pattern = '.rds')))
      rm(list = ls())
      stopApp('Delete all downloaded dataset!')
    }
  })

  output$fxDataTable <- renderDataTable({

    terms() %>% datatable(
      caption = "Table : Forex", 
      escape = FALSE, filter = "top", rownames = FALSE, 
      extensions = list("ColReorder" = NULL, "RowReorder" = NULL, 
                        "Buttons" = NULL, "Responsive" = NULL), 
      options = list(dom = 'BRrltpi', scrollX = TRUE, #autoWidth = TRUE, 
                     lengthMenu = list(c(10, 50, 100, -1), c('10', '50', '100', 'All')), 
                     ColReorder = TRUE, rowReorder = TRUE, 
                     buttons = list('copy', 'print', 
                                    list(extend = 'collection', 
                                         buttons = c('csv', 'excel', 'pdf'), 
                                         text = 'Download'), I('colvis'))))
  })

  ## Set this to "force" instead of TRUE for testing locally (without Shiny Server)
  ## If session$allowReconnect(TRUE), stopApp() will auto reconnect and  there will be endless 
  ##   reconnect and disconnect step only and not able to reset the app.
  #'@ session$allowReconnect(TRUE) 

  llply(c('plotPrice', 'fxdata', 'fxDataTable'), function(x) {
    outputOptions(output, x, suspendWhenHidden = FALSE)
  })
})

shinyApp(ui, server)

来源：DataCollection

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