1 files changed, 48 insertions, 0 deletions
diff --git a/src/geom/align.rs b/src/geom/align.rs
new file mode 100644
index 00000000..1030a133
--- /dev/null
+++ b/src/geom/align.rs
@@ -0,0 +1,48 @@
+use super::*;
+
+/// Where to align something along a directed axis.
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd)]
+pub enum Align {
+    /// Align at the start of the axis.
+    Start,
+    /// Align in the middle of the axis.
+    Center,
+    /// Align at the end of the axis.
+    End,
+}
+
+impl Align {
+    /// Returns the position of this alignment in the given range.
+    pub fn apply(self, range: Range<Length>) -> Length {
+        match self {
+            Self::Start => range.start,
+            Self::Center => (range.start + range.end) / 2.0,
+            Self::End => range.end,
+        }
+    }
+
+    /// The inverse alignment.
+    pub fn inv(self) -> Self {
+        match self {
+            Self::Start => Self::End,
+            Self::Center => Self::Center,
+            Self::End => Self::Start,
+        }
+    }
+}
+
+impl Default for Align {
+    fn default() -> Self {
+        Self::Start
+    }
+}
+
+impl Display for Align {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        f.pad(match self {
+            Self::Start => "start",
+            Self::Center => "center",
+            Self::End => "end",
+        })
+    }
+}