library(playwith)
## 1. A simple action to show a "Hello world" dialog box.
hello_handler <- function(widget, playState)
gmessage("Hello world.")
helloTool <- list("Hello", label = "Say Hello",
callback = hello_handler)
playwith(plot(1:10), tools = list(helloTool))
## 2. A toggle button to draw "G'day universe" on the plot.
## This "callback" is run when the action is activated
## (from toolbar, menu, or keyboard shortcut).
gday_handler <- function(widget, playState) {
if (widget["active"]) {
## tool was turned on: draw the text
playState$tmp$gdayActive <- TRUE
drawGday(playState)
} else {
## turned off; re-draw plot to remove text
playState$tmp$gdayActive <- FALSE
playReplot(playState)
}
}
## This is an "update action", called after plotting.
drawGday <- function(playState) {
if (isTRUE(playState$tmp$gdayActive)) {
## draw text centred on the page
grid.text("G'day universe.", gp = gpar(cex=2))
}
}
gdayTool <- list("Gday", "gtk-yes", "Draw G'day", "F5",
"Overlay text on the plot", gday_handler, FALSE,
update.action = drawGday)
playwith(plot(1:10), tools = list(gdayTool))
## Note the toolbar button (see playwith.options("custom.toolbar"))
## and item in the Tools menu (with keyboard shortcut F5).
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