add rust/wasm impl

1 files changed, 22 insertions, 0 deletions

diff --git a/src/line.rs b/src/line.rs
new file mode 100644
index 0000000..07a1f03
--- /dev/null
+++ b/src/line.rs
@@ -0,0 +1,22 @@
+use crate::point::Point;
+
+pub struct Line {
+    p1: Point,
+    p2: Point,
+}
+
+impl Line {
+    pub fn new(p1: Point, p2: Point) -> Self {
+        Self { p1, p2 }
+    }
+
+    pub fn vec(&self) -> Point {
+        Point::new(self.p2.x - self.p1.x, self.p2.y - self.p1.y)
+    }
+
+    pub fn angle_between(&self, other: &Self) -> f64 {
+        let v1 = self.vec();
+        let v2 = other.vec();
+        (v1.dot(&v2) / (v1.mag() * v2.mag())).acos()
+    }
+}