Suggest ggplot2 instead of import

DESCRIPTION

@@ -24,12 +24,11 @@ BugReports: https://github.com/tesselle/dimensio/issues
 Depends: 
     R (>= 3.5)
 Imports: 
-    ggplot2,
     graphics,
     grDevices,
-    methods,
-    rlang
+    methods
 Suggests: 
+    ggplot2,
     khroma,
     knitr,
     rmarkdown,

NAMESPACE

@@ -52,25 +52,6 @@ exportMethods(viz_variables)
 exportMethods(wrap_confidence)
 exportMethods(wrap_hull)
 exportMethods(wrap_tolerance)
-importFrom(ggplot2,Stat)
-importFrom(ggplot2,aes)
-importFrom(ggplot2,arrow)
-importFrom(ggplot2,coord_fixed)
-importFrom(ggplot2,geom_col)
-importFrom(ggplot2,geom_hline)
-importFrom(ggplot2,geom_line)
-importFrom(ggplot2,geom_path)
-importFrom(ggplot2,geom_point)
-importFrom(ggplot2,geom_segment)
-importFrom(ggplot2,geom_vline)
-importFrom(ggplot2,ggplot)
-importFrom(ggplot2,ggproto)
-importFrom(ggplot2,layer)
-importFrom(ggplot2,scale_x_continuous)
-importFrom(ggplot2,scale_x_discrete)
-importFrom(ggplot2,scale_y_continuous)
-importFrom(ggplot2,sec_axis)
-importFrom(ggplot2,waiver)
 importFrom(grDevices,adjustcolor)
 importFrom(grDevices,chull)
 importFrom(grDevices,colorRamp)
@@ -94,7 +75,6 @@ importFrom(methods,setMethod)
 importFrom(methods,slot)
 importFrom(methods,slotNames)
 importFrom(methods,validObject)
-importFrom(rlang,.data)
 importFrom(stats,approx)
 importFrom(stats,as.dist)
 importFrom(stats,cov)

NEWS.md

@@ -1,6 +1,7 @@
 # dimensio 0.4.0.9000
 ## Bugfixes & changes
 * Put `...` after required arguments.
+* Suggest **ggplot2** instead of import.
 
 ## Enhancements
 * `viz_individuals()`, `viz_row()`, `viz_variables()`, `viz_columns()` and `biplot()` gained new arguments allowing set the x and y limits of the plot.

R/dimensio-deprecated.R

@@ -5,32 +5,44 @@
 #' @keywords internal
 NULL
 
+check_package <- function(x) {
+  if (!requireNamespace(x, quietly = TRUE)) {
+    msg <- "Package %s needed for this function to work. Please install it."
+    stop(sprintf(msg, x), call. = FALSE)
+  }
+  invisible(NULL)
+}
+
+# rlang ========================================================================
+utils::globalVariables(".data")
+
 # ggplot2 ======================================================================
 # https://cran.r-project.org/web/packages/ggplot2/vignettes/extending-ggplot2.html
 
-StatHull <- ggplot2::ggproto(
-  `_class` = "StatHull",
-  `_inherit` = ggplot2::Stat,
-  compute_group = function(data, scales) {
-    i <- chull(data$x, data$y)
-    data[c(i, i[1]), , drop = FALSE]
-  },
-  required_aes = c("x", "y")
-)
-
 #' @rdname dimensio-deprecated
 #' @export
 stat_hull <- function(mapping = NULL, data = NULL, geom = "polygon",
                       position = "identity", na.rm = FALSE, show.legend = NA,
                       inherit.aes = TRUE, ...) {
+  check_package("ggplot2")
+
+  StatHull <- ggplot2::ggproto(
+    `_class` = "StatHull",
+    `_inherit` = ggplot2::Stat,
+    compute_group = function(data, scales) {
+      i <- chull(data$x, data$y)
+      data[c(i, i[1]), , drop = FALSE]
+    },
+    required_aes = c("x", "y")
+  )
+
   ggplot2::layer(
     stat = StatHull, data = data, mapping = mapping, geom = geom,
     position = position, show.legend = show.legend, inherit.aes = inherit.aes,
     params = list(na.rm = na.rm, ...)
   )
 }
 
-
 # Plot =========================================================================
 ## Rows ------------------------------------------------------------------------
 #' @rdname dimensio-deprecated
@@ -134,6 +146,8 @@ setMethod(
                         alpha = NULL, colour = NULL, linetype = NULL,
                         size = NULL, group = NULL) {
     .Deprecated(new = "viz_variables()", old = "plot_variables()")
+    check_package("ggplot2")
+
     ## Prepare data
     data <- prepare_coord(object, margin = 2, axes = axes, active = active,
                           sup = sup, group = group)
@@ -222,6 +236,7 @@ setMethod(
   definition = function(object, select = NULL, variance = TRUE, cumulative = TRUE,
                         fill = "grey30", border = "grey10", colour = "red") {
     .Deprecated(new = "screeplot()", old = "plot_variance()")
+    check_package("ggplot2")
 
     ## Prepare data
     data <- get_eigenvalues(object)
@@ -285,6 +300,8 @@ setMethod(
                         sort = TRUE, decreasing = TRUE, limit = 10,
                         fill = "grey30", border = "grey10") {
     .Deprecated(new = "viz_contributions()", old = "plot_contributions()")
+    check_package("ggplot2")
+
     ## Prepare data
     data <- prepare_contrib(
       object,
@@ -328,6 +345,7 @@ setMethod(
                         sup = TRUE, sort = TRUE, decreasing = TRUE,
                         limit = 10, fill = "grey30", border = "grey10") {
     .Deprecated(new = "viz_cos2()", old = "plot_cos2()")
+    check_package("ggplot2")
 
     ## Prepare data
     data <- prepare_cos2(object, margin = margin, axes = axes,
@@ -354,6 +372,8 @@ setMethod(
 plot_points <- function(object, margin, axes, active = TRUE, sup = TRUE,
                         alpha = NULL, colour = NULL, fill = NULL, shape = NULL,
                         size = NULL, group = NULL) {
+  check_package("ggplot2")
+
   ## Prepare data
   data <- lapply(
     X = margin,

R/dimensio-internal.R

@@ -56,4 +56,3 @@ assert_length <- function(x, expected, empty = FALSE) {
   }
   invisible(x)
 }
-

R/dimensio-package.R

@@ -32,14 +32,10 @@
 #' @keywords internal
 "_PACKAGE"
 
-#' @importFrom ggplot2 aes arrow coord_fixed geom_col geom_hline geom_line
-#' geom_path geom_point geom_segment geom_vline ggplot ggproto layer
-#' scale_x_continuous scale_x_discrete scale_y_continuous sec_axis Stat waiver
 #' @importFrom grDevices adjustcolor chull colorRamp hcl.colors rgb
 #' @importFrom methods Arith as as<- callGeneric callNextMethod
 #' .hasSlot initialize is new setClass setClassUnion
 #' setGeneric setMethod slot slot<- slotNames validObject .valueClassTest
-#' @importFrom rlang .data
 #' @importFrom stats approx as.dist cov optim qchisq qf rmultinom
 #' @importFrom utils capture.output stack tail
 NULL