strange.R

library(ggplot2)

ui <- fluidPage(
  fluidRow(
    column(width = 4, class = "well",
           h4("Brush and double-click to zoom"),
           plotOutput("plot1", height = 300,
                      dblclick = "plot1_dblclick",
                      brush = brushOpts(
                        id = "plot1_brush",
                        resetOnNew = TRUE
                      )
           )
    ),
    column(width = 8, class = "well",
           h4("Left plot controls right plot"),
           fluidRow(
             column(width = 6,
                    plotOutput("plot2", height = 300,
                               brush = brushOpts(
                                 id = "plot2_brush",
                                 resetOnNew = TRUE
                               )
                    )
             ),
             column(width = 6,
                    plotOutput("plot3", height = 300)
             )
           )
    )

  )
)

server <- function(input, output) {

  # -------------------------------------------------------------------
  # Single zoomable plot (on left)
  ranges <- reactiveValues(x = NULL, y = NULL)

  output$plot1 <- renderPlot({
    ggplot(mtcars, aes(wt, mpg)) +
      geom_point() +
      coord_cartesian(xlim = ranges$x, ylim = ranges$y)
  })

  # When a double-click happens, check if there's a brush on the plot.
  # If so, zoom to the brush bounds; if not, reset the zoom.
  observeEvent(input$plot1_dblclick, {
    brush <- input$plot1_brush
    if (!is.null(brush)) {
      ranges$x <- c(brush$xmin, brush$xmax)
      ranges$y <- c(brush$ymin, brush$ymax)

    } else {
      ranges$x <- NULL
      ranges$y <- NULL
    }
  })

  # -------------------------------------------------------------------
  # Linked plots (middle and right)
  ranges2 <- reactiveValues(x = NULL, y = NULL)

  output$plot2 <- renderPlot({
    ggplot(mtcars, aes(wt, mpg)) +
      geom_point()
  })

  output$plot3 <- renderPlot({
    ggplot(mtcars, aes(wt, mpg)) +
      geom_point() +
      coord_cartesian(xlim = ranges2$x, ylim = ranges2$y)
  })

  # When a double-click happens, check if there's a brush on the plot.
  # If so, zoom to the brush bounds; if not, reset the zoom.
  observe({
    brush <- input$plot2_brush
    if (!is.null(brush)) {
      ranges2$x <- c(brush$xmin, brush$xmax)
      ranges2$y <- c(brush$ymin, brush$ymax)

    } else {
      ranges2$x <- NULL
      ranges2$y <- NULL
    }
  })

}

shinyApp(ui, server)
Dardare/prjct documentation built on May 6, 2019, 1:36 p.m.