fix: move ambient to suggests

DESCRIPTION

@@ -15,7 +15,6 @@ RoxygenNote: 7.2.3
 Depends: 
     R (>= 4.1)
 Imports:
-    ambient,
     ape,
     cowplot,
     dplyr,
@@ -39,6 +38,7 @@ Imports:
     tidyr,
     treemapify
 Suggests:
+    ambient,
     deldir,
     elevatr,
     ggstream,

NEWS.md

@@ -1,6 +1,7 @@
 ## aRt 1.4.2
 
 * Add `gradients()`
+* Move {ambient} to Suggests
 
 ## aRt 1.4.1
 

R/flow_fields.R

@@ -26,49 +26,53 @@ flow_fields <- function(n = 10000,
   if (!requireNamespace("particles")) {
     stop("Please install {particles} to use this function.")
   } else {
-    set.seed(s)
-    grid <- ambient::long_grid(seq(1, 10, length.out = granularity),
-                               seq(1, 10, length.out = granularity)) |>
-      dplyr::mutate(
-        x1 = .data$x + ambient::gen_simplex(x = .data$x, y = .data$y, frequency = x_freq),
-        y1 = .data$y + ambient::gen_simplex(x = .data$x, y = .data$y, frequency = y_freq)
-      )
+    if (!requireNamespace("ambient")) {
+      stop("Please install {ambient} to use this function.")
+    } else {
+      set.seed(s)
+      grid <- ambient::long_grid(seq(1, 10, length.out = granularity),
+                                 seq(1, 10, length.out = granularity)) |>
+        dplyr::mutate(
+          x1 = .data$x + ambient::gen_simplex(x = .data$x, y = .data$y, frequency = x_freq),
+          y1 = .data$y + ambient::gen_simplex(x = .data$x, y = .data$y, frequency = y_freq)
+        )
 
-    curl <- ambient::curl_noise(ambient::gen_perlin, x = grid$x1, y = grid$y1)
-    grid$angle <- atan2(curl$y, curl$x) - atan2(grid$y1, grid$x1)
+      curl <- ambient::curl_noise(ambient::gen_perlin, x = grid$x1, y = grid$y1)
+      grid$angle <- atan2(curl$y, curl$x) - atan2(grid$y1, grid$x1)
 
-    field <- as.matrix(grid, grid$x, value = grid$angle)
+      field <- as.matrix(grid, grid$x, value = grid$angle)
 
-    sim <- tidygraph::create_empty(n) |>
-      particles::simulate(alpha_decay = 0, setup = particles::aquarium_genesis(vel_max = 0)) |>
-      particles::wield(particles::reset_force, xvel = 0, yvel = 0) |>
-      particles::wield(particles::field_force, angle = field, vel = 0.1, xlim = c(-5, 5), ylim = c(-5, 5)) |>
-      particles::evolve(100, particles::record)
+      sim <- tidygraph::create_empty(n) |>
+        particles::simulate(alpha_decay = 0, setup = particles::aquarium_genesis(vel_max = 0)) |>
+        particles::wield(particles::reset_force, xvel = 0, yvel = 0) |>
+        particles::wield(particles::field_force, angle = field, vel = 0.1, xlim = c(-5, 5), ylim = c(-5, 5)) |>
+        particles::evolve(100, particles::record)
 
-    traces <- data.frame(do.call(rbind, lapply(sim$history, particles::position)))
-    names(traces) <- c("x", "y")
+      traces <- data.frame(do.call(rbind, lapply(sim$history, particles::position)))
+      names(traces) <- c("x", "y")
 
-    traces <-
-      traces |>
-      dplyr::mutate(particle = rep(1:n, 100)) |>
-      dplyr::group_by(.data$particle) |>
-      dplyr::mutate(colour = sample(line_col, 1, replace = TRUE))
+      traces <-
+        traces |>
+        dplyr::mutate(particle = rep(1:n, 100)) |>
+        dplyr::group_by(.data$particle) |>
+        dplyr::mutate(colour = sample(line_col, 1, replace = TRUE))
 
-    p <- ggplot2::ggplot() +
-      ggplot2::geom_path(data = traces,
-                         mapping = ggplot2::aes(x = .data$x,
-                                                y = .data$y,
-                                                group = .data$particle,
-                                                colour = .data$colour),
-                         size = 0.3,
-                         alpha = alpha) +
-      ggplot2::coord_cartesian(expand = FALSE) +
-      ggplot2::scale_color_identity(guide = "none") +
-      ggplot2::theme_void() +
-      ggplot2::theme(panel.background = ggplot2::element_rect(fill = bg_col, colour = bg_col),
-                     plot.background = ggplot2::element_rect(fill = bg_col, colour = bg_col),
-                     legend.position = "none",
-                     plot.margin = ggplot2::unit(c(0, 0, 0, 0), "cm"))
-    return(p)
+      p <- ggplot2::ggplot() +
+        ggplot2::geom_path(data = traces,
+                           mapping = ggplot2::aes(x = .data$x,
+                                                  y = .data$y,
+                                                  group = .data$particle,
+                                                  colour = .data$colour),
+                           size = 0.3,
+                           alpha = alpha) +
+        ggplot2::coord_cartesian(expand = FALSE) +
+        ggplot2::scale_color_identity(guide = "none") +
+        ggplot2::theme_void() +
+        ggplot2::theme(panel.background = ggplot2::element_rect(fill = bg_col, colour = bg_col),
+                       plot.background = ggplot2::element_rect(fill = bg_col, colour = bg_col),
+                       legend.position = "none",
+                       plot.margin = ggplot2::unit(c(0, 0, 0, 0), "cm"))
+      return(p)
+    }
   }
 }