Refactor grid row layout

2 files changed, 18 insertions, 0 deletions

diff --git a/src/geom/length.rs b/src/geom/length.rs
index 21843d3e..ecfe5616 100644
--- a/src/geom/length.rs
+++ b/src/geom/length.rs
@@ -18,6 +18,11 @@ impl Length {
         Self { raw: N64::from(0.0) }
     }
 
+    /// The inifinite length.
+    pub fn inf() -> Self {
+        Self { raw: N64::from(f64::INFINITY) }
+    }
+
     /// Create a length from a number of points.
     pub fn pt(pt: f64) -> Self {
         Self::with_unit(pt, LengthUnit::Pt)
@@ -203,6 +208,12 @@ impl Sum for Length {
     }
 }
 
+impl<'a> Sum<&'a Length> for Length {
+    fn sum<I: Iterator<Item = &'a Length>>(iter: I) -> Self {
+        iter.copied().fold(Length::zero(), Add::add)
+    }
+}
+
 /// Different units of length measurement.
 #[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd)]
 pub enum LengthUnit {
diff --git a/src/geom/size.rs b/src/geom/size.rs
index 1c411fb3..4b94d0ae 100644
--- a/src/geom/size.rs
+++ b/src/geom/size.rs
@@ -57,6 +57,13 @@ impl Size {
             SpecAxis::Vertical => Gen::new(self.width, self.height),
         }
     }
+
+    /// Find the largest contained size that satisfies the given `aspect` ratio.
+    pub fn with_aspect(self, aspect: f64) -> Self {
+        let width = self.width.min(aspect * self.height);
+        let height = width / aspect;
+        Size::new(width, height)
+    }
 }
 
 impl Get<SpecAxis> for Size {