问题
I'm trying to make an interactive chart that plots financial stock data on a shiny app. My attempt is to update continuously the data, hence the chart. I managed this using a package called Highcharter. Below it's shown a part of code in the server part (getDataIntraday() receive two input and returns updated 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")))
})
This works: every 60 seconds the chart and the data are automatically updated. The problem are the following:
When the data and the chart is updated, the zoom settled by the user is not maintained.
The chart need too many seconds in order to update itself because it is computed all the structure, instead of only add the last candle.
Are there some ways (some package) that allows to update the chart without compute again the entire function? Or, at least, is there a way to fix all the elements in the chart except by the candles?
回答1:
You can try to refer to mine via DataCollection.
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)
Source : DataCollection
来源：https://stackoverflow.com/questions/40424407/real-time-chart-on-r-shiny