library(webrockets)
library(shiny)
con <- webrockets::ws_connect("ws://192.168.49.140:81")
inline_widget <- function(x, width = "100px") {
shiny::div(
style = glue("display: inline-block;vertical-align:top; width: {width};"),
x)
}
csv_newline <- function(x) {
paste0(paste(x, collapse = ","), "\r\n")
}
ui <- fluidPage(
br(),
actionButton("power", label = NULL, icon = icon("power-off", "text-danger"),
width = NULL,
style = "border-radius: 25px; position: absolute; top: 15px; right: 15px;z-index: 20;"),
inline_widget(actionButton("start", icon = icon("play"),
label = NULL, width = "100%"), "50px"),
inline_widget(actionButton("reset", icon = icon("undo"),
label = NULL, width = "100%"), "50px"),
inline_widget(h5("Vars:"), "35px"),
inline_widget(selectInput(
"y_var", label = NULL, choices = signal_vars,
selected = signal_vars, multiple = T
), "calc(95% - 180px);z-index: 15;"),
plotlyOutput("plot", height = "250px"),
inline_widget(checkboxInput("save", strong("Save to file?")), "30%"),
inline_widget(textInput("file", NULL, save_file_default), "65%")
)
server <- function(input, output, session) {
rv <- reactiveValues()
rv$state <- 0
# first_xy <- separateXY(first_dot)
output$plot <- renderPlotly({
req(input$y_var)
input$reset
p <- plot_ly(type = 'scatter', mode = 'lines', line = list(width = 3))
for (y_i in sort(as.integer(input$y_var))) {
p <- add_trace(p, y = first_dot[y_i], name = names(first_dot[y_i]))
}
return(p)
})
observeEvent(input$start, {
rv$state <- 1 - rv$state
start_icon <- icon(c("play", "pause")[rv$state + 1])
updateActionButton(session, "start", icon = start_icon)
ar_flush_hard(con, flush_time)
})
observeEvent(input$reset, {
rv$state <- 0
updateActionButton(session, "start", icon = icon("play"))
ar_flush_hard(con, flush_time)
})
observeEvent(input$save, {
if (!file.exists(input$file)) {
file.create(input$file)
cat(csv_newline(names(first_dot)), file = input$file)
}
}, ignoreInit = TRUE)
observe({
invalidateLater(1)
if (rv$state) {
ar_flush_hard(con, 0.04, FALSE)
realtime <- sep_fun(ar_read(con, eolchar, buf_max, timeout))
if (input$save) {
cat(csv_newline(realtime), file = input$file, append = TRUE)
}
realtime_y <- lapply(realtime[sort(as.integer(input$y_var))], list)
realtime_list <- list(y = realtime_y)
to_traces <- as.list(seq(length(input$y_var)))
plotlyProxy("plot", session) %>%
plotlyProxyInvoke("extendTraces", realtime_list, to_traces)
}
})
observeEvent(input$power, {
invisible(stopApp())
})
}
shinyApp(ui, server)
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