separate tabs into files

Author: Wasin Pipattungsakul

src/index.R

@@ -1,5 +1,9 @@
 library(shiny)
 
+source("./tab1.R")
+source("./tab2.R")
+source("./kmean_cluster.R")
+
 ui <- fluidPage(
   # external styles
   includeCSS("./www/styles.css"),
@@ -20,9 +24,9 @@ ui <- fluidPage(
   tabsetPanel(
     type = "tabs",
     # add tabs here
-    tabPanel("<Tab 1>", "<Content in tab 1>"),
-    tabPanel("<Tab 2>", "<Content in tab 2>"),
-    tabPanel("<Tab 3>", "<Content in tab 3>"),
+    tab1,
+    tab2,
+    kmean_cluster_tab,
   )
 )
 
@@ -37,6 +41,9 @@ server <- function(input, output, session) {
     )
   }) |>
     bindEvent(input$about)
+
+  # tab io
+  kmean_cluster_server(input, output, session)
 }
 
 # export app

src/kmean_cluster.R

@@ -0,0 +1,40 @@
+library(shiny)
+
+.parameters <- setdiff(names(iris), "Species")
+
+kmean_cluster_tab <- tabPanel("K-Mean Clustering", pageWithSidebar(
+  headerPanel("Iris k-means clustering"),
+  sidebarPanel(
+    selectInput("xcol", "X Variable", .parameters),
+    selectInput("ycol", "Y Variable", .parameters, selected = .parameters[[2]]),
+    numericInput("clusters", "Cluster count", 3, min = 1, max = 9)
+  ),
+  mainPanel(
+    plotOutput("plot1")
+  )
+))
+
+kmean_cluster_server <- function(input, output, session) {
+  # Combine the selected variables into a new data frame
+  selected_data <- reactive({
+    iris[, c(input$xcol, input$ycol)]
+  })
+
+  clusters <- reactive({
+    kmeans(selected_data(), input$clusters)
+  })
+
+  output$plot1 <- renderPlot({
+    palette(c(
+      "#E41A1C", "#377EB8", "#4DAF4A", "#984EA3",
+      "#FF7F00", "#FFFF33", "#A65628", "#F781BF", "#999999"
+    ))
+
+    par(mar = c(5.1, 4.1, 0, 1))
+    plot(selected_data(),
+      col = clusters()$cluster,
+      pch = 20, cex = 3
+    )
+    points(clusters()$centers, pch = 4, cex = 4, lwd = 4)
+  })
+}

src/tab1.R

@@ -0,0 +1,3 @@
+library(shiny)
+
+tab1 <- tabPanel("<Tab 1>", "<Content in tab 1>")

src/tab2.R

@@ -0,0 +1,3 @@
+library(shiny)
+
+tab2 <- tabPanel("<Tab 2>", "<Content in tab 2>")