Interactive plotting with R raster: values on mouseover

Question

I\'d like to do a small program in R for interactive visualization and modification of some raster datasets, seen as colored images. The user should open a file (from the termin

Answer 1

I give you a simple example of how to do it in R without external Java libraries, if you want Javan's features you can adapt it, but each java graphics library is different and I have never done anything similar.

set.seed(123)
mydata <- data.frame(x = runif(10), y = runif(10))

edit_plot <- function(data) {
  plot(data)

  sel <- locator(n = 1)
  if(is.null(sel)) return(TRUE)
  dd <- (data$x - sel$x)^2 + (data$y - sel$y)^2

  data[which.min(dd),] <- edit(data[which.min(dd),])
  r <- edit_plot(data)
  if(r) return(TRUE)
}
edit_plot(mydata)

To exit press Esc when locator is active.