Draw only labels in the plotting region

NEWS.md

@@ -2,6 +2,9 @@
 ## New classes and methods
 * Add `export()` to create a Zip archive of all results in CSV format.
 
+## Internals
+* Compute the position and draw only the labels in the plotting region.
+
 # dimensio 0.9.0
 ## New classes and methods
 * Add `pcoa()` to compute principal coordinates analysis.

R/annotations.R

@@ -38,12 +38,13 @@ label <- function(x, y = NULL, labels = seq_along(x$x),
   labs <- compute_labels(x = x$x, y = x$y, labels = labels)
 
   ## Draw labels
-  switch(
+  fun <- switch(
     type,
-    text = graphics::text(labs, labels = labels, ...),
-    shadow = text_shadow(labs, labels = labels, ...),
-    box = text_box(labs, labels = labels, ...)
+    text = graphics::text,
+    shadow = text_shadow,
+    box = text_box
   )
+  fun(labs, labels = labels, ...)
 
   invisible(labs)
 }

R/biplot.R

@@ -212,26 +212,10 @@ viz_biplot <- function(coord_row, coord_col, ..., rows = TRUE, columns = TRUE,
   if (!is.null(labels)) {
     labels <- match.arg(labels, several.ok = TRUE)
     if (any(labels == "rows") | any(labels == "individuals")) {
-      label(
-        x = coord_row$x,
-        y = coord_row$y,
-        labels = coord_row$label,
-        type = "shadow",
-        cex = coord_row$cex,
-        col = coord_row$col,
-        xpd = TRUE
-      )
+      viz_labels(coord_row, filter = NULL)
     }
     if (any(labels == "columns") | any(labels == "variables")) {
-      label(
-        x = coord_col$x,
-        y = coord_col$y,
-        labels = coord_col$label,
-        type = "shadow",
-        cex = coord_col$cex,
-        col = coord_col$col,
-        xpd = TRUE
-      )
+      viz_labels(coord_col, filter = NULL)
     }
   }
 

R/viz_coordinates.R

@@ -364,6 +364,8 @@ viz_points <- function(x, margin, axes, ...,
 #'  It must be one of "`text`", "`shadow`" or "`box`". Any unambiguous substring
 #'  can be given.
 #' @param ... Currently not used.
+#' @details
+#'  Only labels in the plotting region (given by `par("usr")`) will be drawn.
 #' @author N. Frerebeau
 #' @keywords internal
 viz_labels <- function(x, filter = "contribution", n = 10,
@@ -376,6 +378,14 @@ viz_labels <- function(x, filter = "contribution", n = 10,
     x <- x[k, , drop = FALSE] # Subset
   }
 
+  ## Filter
+  xlim <- graphics::par("usr")[c(1, 2)]
+  ylim <- graphics::par("usr")[c(3, 4)]
+  x_filter <- x$x >= min(xlim) & x$x <= max(xlim)
+  y_filter <- x$y >= min(ylim) & x$y <= max(ylim)
+  xy_filter <- which(x_filter & y_filter)
+  x <- x[xy_filter, , drop = FALSE]
+
   label(
     x = x$x,
     y = x$y,