diff --git a/board-builder-gui/src/main.rs b/board-builder-gui/src/main.rs
index fbbae6e..e2c9f3b 100644
--- a/board-builder-gui/src/main.rs
+++ b/board-builder-gui/src/main.rs
@@ -7,7 +7,7 @@ use image::DynamicImage;
 
 use rfd::FileDialog;
 
-use board_builder::{ Board, Node, CoordTransformer, read_board_from_file, write_board_to_file, should_wrap_horizontal };
+use board_builder::{ Board, Node, CoordTransformer, read_board_from_file, write_board_to_file };
 
 use std::path::Path;
 use std::collections::HashSet;
@@ -174,11 +174,11 @@ impl BoardBuilderApp {
             let stroke = Stroke { width: 1.0, color: Color32::BLACK };
             for edge in &node.edges {
                 let other_node = &board.nodes[edge];
-                if board.config.horizontal_wrapping && should_wrap_horizontal(node, other_node) {
+                if board.config.horizontal_wrapping && node.should_wrap_horizontal(other_node) {
                     let mut nodes = [node, other_node];
                     nodes.sort_by(|a, b| a.x.partial_cmp(&b.x).unwrap());
                     let [left_node, right_node] = nodes;
-                    let y_mid = (left_node.y + right_node.y) / 2.0;
+                    let y_mid = left_node.y_mid(right_node);
                     painter.line_segment(
                         [view.inv_xform(0.0, y_mid), view.inv_xform(left_node.x, left_node.y)],
                         stroke
diff --git a/src/lib.rs b/src/lib.rs
index cc314e4..742e70a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -23,6 +23,22 @@ pub struct Node {
     pub edges: HashSet<usize>,
     pub labels: HashMap<String, String>,
 }
+
+impl Node {
+    pub fn should_wrap_horizontal(&self, other: &Node) -> bool {
+        let mut xs = [self.x, other.x];
+        xs.sort_by(|a, b| a.partial_cmp(b).unwrap());
+        xs[0] + (1.0 - xs[1]) < xs[1] - xs[0]
+    }
+
+    pub fn y_mid(&self, other: &Node) -> f32 {
+        let mut coords = [(self.x, self.y), (other.x, other.y)];
+        coords.sort_by(|a, b| a.0.partial_cmp(&b.0).unwrap());
+        let [(x1, y1), (x2, y2)] = coords;
+        y1 - x1 * (y1 - y2) / (x1 + 1.0 - x2)
+    }
+}
+
 #[derive(Serialize, Deserialize, Debug, Default)]
 #[serde(default)]
 pub struct Board {
@@ -104,12 +120,6 @@ fn dist_sq((x0, y0): (f32, f32), (x1, y1): (f32, f32)) -> f32 {
     (x1 - x0) * (x1 - x0) + (y1 - y0) * (y1 - y0)
 }
 
-pub fn should_wrap_horizontal(node1: &Node, node2: &Node) -> bool {
-    let mut xs = [node1.x, node2.x];
-    xs.sort_by(|a, b| a.partial_cmp(b).unwrap());
-    xs[0] + (1.0 - xs[1]) < xs[1] - xs[0]
-}
-
 use std::io;
 use std::io::{ Write, Read, Cursor };
 use std::fs::File;