quarto vignette builder

DESCRIPTION

@@ -47,4 +47,4 @@ Collate:
     'ellipses.R'
     'str.R'
     'zzz.R'
-VignetteBuilder: knitr
+VignetteBuilder: quarto

NAMESPACE

@@ -10,6 +10,7 @@ export(get_tibble_defaults)
 export(labeler)
 export(nudge)
 export(point)
+export(polar)
 export(radian)
 export(round_probability)
 export(style)

R/points.R

@@ -1,7 +1,9 @@
 # Point----
 
-#' point class
+#' point
 #'
+#' Points are specified with x and y coordinates.# Polar class ----
+#' @export
 #' @param x Coordinate on the x-axis
 #' @param y Coordinate on the y-axis
 #' @param r Radius = Distance from the origin to the point
@@ -99,3 +101,24 @@ point <- new_class(
     new_object(S7_object(), x = d$x, y = d$y, style = d@style)
   }
 )
+
+
+# Polar Point class ----
+#' polar
+#'
+#' Polar points are ordinary points but are specified with an angle (theta) and a radial distance (r)
+#' @rdname point
+#' @export
+polar <- new_class(
+  name = "polar",
+  parent = point,
+  constructor = function(theta = class_missing,
+                         r = class_missing,
+                         style = class_missing,
+                         ...) {
+    if (length(r) == 0) r <- 0
+    if (length(theta) == 0) theta <- angle(0)
+
+    p <- point(theta = theta, r = r, style = style + style(...))
+    new_object(p)
+  })

vignettes/angles.qmd

@@ -41,3 +41,16 @@ my_font <- "Roboto Condensed"
 ```
 
 
+Angles have different kinds of units associated with them: degrees, radians, and turns. The `angle` class can take turns (i.e., 1 turn = one full rotation a circle), degrees (1 turn = 360 degrees), or radians (1 turn = $2\pi$ = $\tau$).
+
+I like &pi; just fine, but I agree with Michael Hartl's [Tau Manifesto](https://tauday.com/tau-manifesto) that we would have been better off if we had recognized that the number of radians to complete a full turn of a circle (&tau; = 2&pi; &asymp; 6.283185) is more fundamental than the number of radians to complete a half turn (&pi;). 
+
+Turns | Radians | Degrees |
+:----:|:-------:|:-------:|
+$\frac{1}{12}$  | $\frac{\tau}{12}=\frac{\pi}{6}$   | $30^\circ$  |
+$\frac{1}{8}$  | $\frac{\tau}{8}=\frac{\pi}{4}$     | $45^\circ$  |
+$\frac{1}{6}$  | $\frac{\tau}{6}=\frac{\pi}{3}$     | $60^\circ$  |
+$\frac{1}{4}$  | $\frac{\tau}{4}=\frac{\pi}{2}$     | $90^\circ$  |
+$\frac{1}{3}$  | $\frac{\tau}{3}=\frac{2\pi}{3}$    | $120^\circ$ |
+$\frac{1}{2}$  | $\frac{\tau}{2}=\pi$               | $180^\circ$ |
+$1$            | $\tau=2\pi$                        | $360^\circ$ |