1 files changed, 12 insertions, 0 deletions
diff --git a/src/library/mod.rs b/src/library/mod.rs
index 8f00e5fe..88f003c2 100644
--- a/src/library/mod.rs
+++ b/src/library/mod.rs
@@ -53,6 +53,7 @@ pub fn new() -> Scope {
 
     // Graphics.
     std.def_node::<graphics::ImageNode>("image");
+    std.def_node::<graphics::LineNode>("line");
     std.def_node::<graphics::RectNode>("rect");
     std.def_node::<graphics::SquareNode>("square");
     std.def_node::<graphics::EllipseNode>("ellipse");
@@ -170,3 +171,14 @@ castable! {
     Expected: "content",
     Value::Content(content) => content.pack(),
 }
+
+castable! {
+    Spec<Linear>,
+    Expected: "two-dimensional length array",
+    Value::Array(array) => {
+        let e = "point array must contain exactly two entries";
+        let a = array.get(0).map_err(|_| e)?.clone().cast::<Linear>()?;
+        let b = array.get(1).map_err(|_| e)?.clone().cast::<Linear>()?;
+        Spec::new(a, b)
+    },
+}