Nothing
## =============================================================================
## from the help page of rgl.setMouseCallbacks
## =============================================================================
pan3d <- function(button) {
start <- list()
begin <- function(x, y) {
start$userMatrix <<- par3d("userMatrix")
start$viewport <<- par3d("viewport")
start$scale <<- par3d("scale")
start$projection <<- rgl.projection()
start$pos <<- rgl.window2user( x/start$viewport[3], 1 - y/start$viewport[4], 0.5,
projection=start$projection)
}
update <- function(x, y) {
xlat <- (rgl.window2user( x/start$viewport[3], 1 - y/start$viewport[4], 0.5,
projection = start$projection) - start$pos)*start$scale
mouseMatrix <- translationMatrix(xlat[1], xlat[2], xlat[3])
par3d(userMatrix = start$userMatrix %*% t(mouseMatrix) )
}
rgl.setMouseCallbacks(button, begin, update)
# cat("Callbacks set on button", button, "of rgl device",rgl.cur(),"\n")
}
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