From d1ff94a3b59b5642c549b1141853e0ffbe842185 Mon Sep 17 00:00:00 2001
From: Laurenz <laurmaedje@gmail.com>
Date: Tue, 28 Mar 2023 16:57:18 +0200
Subject: [PATCH] A bit more polygon docs

---
 docs/src/general/changelog.md    |   5 ++-
 library/src/visualize/mod.rs     |   4 +--
 library/src/visualize/polygon.rs |  30 ++++++++++++------
 tests/ref/visualize/polygon.png  | Bin 7577 -> 1957 bytes
 tests/typ/visualize/polygon.typ  |  51 ++++++++++++++++---------------
 5 files changed, 53 insertions(+), 37 deletions(-)

diff --git a/docs/src/general/changelog.md b/docs/src/general/changelog.md
index 45de2dd69..958c3e4a8 100644
--- a/docs/src/general/changelog.md
+++ b/docs/src/general/changelog.md
@@ -6,7 +6,10 @@ description: |
 
 # Changelog
 ## Unreleased
-- Reduced maximum function call depth from 256 to 64.
+- Added [`polygon`]($func/polygon) function
+- Reduced maximum function call depth from 256 to 64
+- CLI now returns with non-zero status code if there is an error
+- CLI now watches the root directory instead of the current one
 
 ## March 28, 2023
 - **Breaking:** Enumerations now require a space after their marker, that is,
diff --git a/library/src/visualize/mod.rs b/library/src/visualize/mod.rs
index 198c707d5..06eec23da 100644
--- a/library/src/visualize/mod.rs
+++ b/library/src/visualize/mod.rs
@@ -2,10 +2,10 @@
 
 mod image;
 mod line;
-mod shape;
 mod polygon;
+mod shape;
 
 pub use self::image::*;
 pub use self::line::*;
+pub use self::polygon::*;
 pub use self::shape::*;
-pub use self::polygon::*;
\ No newline at end of file
diff --git a/library/src/visualize/polygon.rs b/library/src/visualize/polygon.rs
index 40058834a..07725b722 100644
--- a/library/src/visualize/polygon.rs
+++ b/library/src/visualize/polygon.rs
@@ -1,10 +1,19 @@
 use crate::prelude::*;
 
-/// A closed-path polygon.
+/// A closed polygon.
+///
+/// The polygon is defined by its corner points and is closed automatically.
 ///
 /// ## Example
 /// ```example
-/// #polygon(fill: blue, (0pt, 0pt), (10pt, 0pt), (10pt, 10pt))
+/// #polygon(
+///   fill: red,
+///   stroke: 2pt + black,
+///   (0pt, 0pt),
+///   (50%, 0pt),
+///   (50%, 4cm),
+///   (20%, 4cm),
+/// )
 /// ```
 ///
 /// Display: Polygon
@@ -13,6 +22,9 @@ use crate::prelude::*;
 pub struct PolygonElem {
     /// How to fill the polygon. See the
     /// [rectangle's documentation]($func/rect.fill) for more details.
+    ///
+    /// Currently all polygons are filled according to the
+    /// [non-zero winding rule](https://en.wikipedia.org/wiki/Nonzero-rule).
     pub fill: Option<Paint>,
 
     /// How to stroke the polygon. See the [lines's
@@ -21,7 +33,8 @@ pub struct PolygonElem {
     #[fold]
     pub stroke: Option<PartialStroke>,
 
-    /// The vertices of the polygon. The polygon automatically closes itself.
+    /// The vertices of the polygon. Each point is specified as an array of two
+    /// [relative lengths]($type/relative-length).
     #[variadic]
     pub vertices: Vec<Axes<Rel<Length>>>,
 }
@@ -45,20 +58,19 @@ impl Layout for PolygonElem {
             .collect();
 
         let size = points.iter().fold(Point::zero(), |max, c| c.max(max)).to_size();
-
         let target = regions.expand.select(regions.size, size);
         let mut frame = Frame::new(target);
 
-        // only create a path if there is more than zero points.
+        // Only create a path if there are more than zero points.
         if points.len() > 0 {
-            let stroke = self.stroke(styles).map(|e| e.unwrap_or_default());
             let fill = self.fill(styles);
+            let stroke = self.stroke(styles).map(PartialStroke::unwrap_or_default);
 
-            // construct a closed path given all points.
+            // Construct a closed path given all points.
             let mut path = Path::new();
             path.move_to(points[0]);
-            for point in &points[1..] {
-                path.line_to(*point);
+            for &point in &points[1..] {
+                path.line_to(point);
             }
             path.close_path();
 
diff --git a/tests/ref/visualize/polygon.png b/tests/ref/visualize/polygon.png
index d2a86a53ba7fd9a51d7a038e287dd341515fcffc..2ffd7f8a1ecdbecae011f4e10f37af83f14db5b4 100644
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diff --git a/tests/typ/visualize/polygon.typ b/tests/typ/visualize/polygon.typ
index defd89be5..9f40d7fd2 100644
--- a/tests/typ/visualize/polygon.typ
+++ b/tests/typ/visualize/polygon.typ
@@ -1,31 +1,32 @@
 // Test polygons.
 
 ---
-#set page(height: 220pt, width: 50pt)
-#box({
-  set polygon(stroke: 0.75pt, fill: blue)
-  polygon((0em, 0pt))
-  // this should not give an error
-  polygon()
-  polygon((0pt, 0pt), (10pt, 0pt))
-  polygon((5pt, 0pt), (0pt, 10pt), (10pt, 10pt))
-  polygon(
-    (0pt, 0pt), (5pt, 5pt), (10pt, 0pt),
-    (15pt, 5pt),
-    (5pt, 10pt)
-  )
-  polygon(stroke: none, (5pt, 0pt), (0pt, 10pt), (10pt, 10pt))
-  polygon(stroke: 3pt, fill: none, (5pt, 0pt), (0pt, 10pt), (10pt, 10pt))
-  // relative size
-  polygon((0pt, 0pt), (100%, 5pt), (50%, 10pt))
-  // antiparallelogram
-  polygon((0pt, 5pt), (5pt, 0pt), (0pt, 10pt), (5pt, 15pt))
-  // self-intersections
-  polygon((0pt, 10pt), (30pt, 20pt), (0pt, 30pt), (20pt, 0pt), (20pt, 35pt))
-})
+#set page(width: 50pt)
+#set polygon(stroke: 0.75pt, fill: blue)
+
+// These are not visible, but should also not give an error
+#polygon()
+#polygon((0em, 0pt))
+#polygon((0pt, 0pt), (10pt, 0pt))
+
+#polygon((5pt, 0pt), (0pt, 10pt), (10pt, 10pt))
+#polygon(
+  (0pt, 0pt), (5pt, 5pt), (10pt, 0pt),
+  (15pt, 5pt),
+  (5pt, 10pt)
+)
+#polygon(stroke: none, (5pt, 0pt), (0pt, 10pt), (10pt, 10pt))
+#polygon(stroke: 3pt, fill: none, (5pt, 0pt), (0pt, 10pt), (10pt, 10pt))
+
+// Relative size
+#polygon((0pt, 0pt), (100%, 5pt), (50%, 10pt))
+
+// Antiparallelogram
+#polygon((0pt, 5pt), (5pt, 0pt), (0pt, 10pt), (5pt, 15pt))
+
+// Self-intersections
+#polygon((0pt, 10pt), (30pt, 20pt), (0pt, 30pt), (20pt, 0pt), (20pt, 35pt))
 
 ---
-// Test errors.
-
 // Error: 10-17 point array must contain exactly two entries
-#polygon((50pt,))
\ No newline at end of file
+#polygon((50pt,))