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app.R
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app.R
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#
# Author: B.M. de Haan
# Github: https://github.com/bas-dehaan/Centrifuge-Balancer/
#
library(shiny)
# Define UI for the application
ui = fluidPage(
# Application title
titlePanel("Centrifuge Balancer"),
helpText("Based on an Eppendorf Mini Spin centrifuge"),
# Sidebar with a slider input for number of tubes
sidebarLayout(
sidebarPanel(
sliderInput("tubes",
"Number of tubes:",
min = 1,
max = 12,
value = 6)
),
#Output
mainPanel(
#Show the selected number of tubes
textOutput("tube_number"),
#Show the recomended centrifuge holes
textOutput("stable_number"),
#Show the image of a stable centrifuge configuration
imageOutput("stable_img")
)
)
)
server = function(input, output) {
# Display the number of tubes with the correct spelling
output$tube_number = renderText({
if(input$tubes==1){
paste("You have selected", input$tubes, "tube")
}else{
paste("You have selected", input$tubes, "tubes")
}
})
# Display the hole-numbers to make a stable configuration
output$stable_number = renderText({
if(input$tubes==2){
print("Use holes 1 and 7 to balance")
}else if(input$tubes==3){
print("Use holes 1, 5 and 9 to balance")
}else if(input$tubes==4){
print("Use holes 1, 4, 7 and 10 to balance")
}else if(input$tubes==5){
print("Use holes 1, 4, 5, 9 and 10 to balance")
}else if(input$tubes==6){
print("Use holes 1, 3, 5, 7, 9 and 11 to balance")
}else if(input$tubes==7){
print("Use holes 1, 2, 5, 6, 8, 9 and 12 to balance")
}else if(input$tubes==8){
print("Use holes 1, 2, 4, 5, 7, 8, 10 and 11 to balance")
}else if(input$tubes==9){
print("Use holes 1, 2, 4, 5, 6, 8, 9, 10 and 12 to balance")
}else if(input$tubes==10){
print("Use holes 1, 2, 3, 5, 6, 7, 8, 9, 11 and 12 to balance")
}else if(input$tubes==12){
print("Use holes all to balance")
}else{
print("Impossible to balance")
}
})
output$stable_img = renderImage({
# Select the image corresponding to the input$tubes in the ./images directory
image_file_path = normalizePath(file.path('./images/', paste0('Centrifuge-', input$tubes, '.jpg')))
# Return a list containing the filename and alt text
list(src = image_file_path,
alt = paste("Graphical view of Centrifuge", input$tubes))
# Don't delete the file after use
}, deleteFile = FALSE)
}
# Run the application
shinyApp(ui = ui, server = server)