Is it possible to create an interactive Shiny graph that when you hover over the graph a subsequent graph appears? Right now I have two graphs in the same panel.
This is the closest logic example I can find, although the subsequent (zoomed) plot is already there (whereas I only want the subsequent graph to appear when the mouse hovers over the main graph) :
You can use the hover
option in the plotOutput
of the ui.R
, and couple it with a conditional panel to only display the second plot when the user is hovering over the first one.
I modified the example you posted with these changes:
library(ggplot2)
library(Cairo) # For nicer ggplot2 output when deployed on Linux
library(shiny)
ui <- fluidPage(
fluidRow(
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
),
#add the hover options
hover = hoverOpts(
id = "plot2_hover",
nullOutside = TRUE
)
)
),
column(width = 6,
#the second plot will be hidden if the user's mouse is not on the first one
conditionalPanel(
condition = "input.plot2_hover != null",
plotOutput("plot3", height = 300)
)
)
)
)
)
)
server <- function(input, output) {
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$plot2_brush
print(input$plot2_hover)
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)
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