Can turn on a "horizontal wrap" setting

Cargo.lock

@@ -146,7 +146,7 @@ dependencies = [
 
 [[package]]
 name = "board-builder-gui"
-version = "1.0.0"
+version = "1.1.0"
 dependencies = [
  "board-builder",
  "eframe",

board-builder-gui/Cargo.toml

@@ -3,10 +3,9 @@ name = "board-builder-gui"
 version = "1.1.0"
 edition = "2021"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
 board-builder = { path = "../" }
 eframe = "0.18.0"
 rfd = "0.8.2"
 image = "0.24.2"
+

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 };
+use board_builder::{ Board, Node, CoordTransformer, read_board_from_file, write_board_to_file, should_wrap_horizontal };
 
 use std::path::Path;
 use std::collections::HashSet;
@@ -29,6 +29,7 @@ struct BoardBuilderApp {
     create_node_dialog: CreateNodeDialog,
     edit_node_dialog: EditNodeDialog,
     edit_labels_dialog: EditLabelsDialog,
+    edit_settings_dialog: EditSettingsDialog,
 }
 
 #[derive(Clone, Copy)]
@@ -93,7 +94,10 @@ impl eframe::App for BoardBuilderApp {
                     if ui.button("Edit Labels...").clicked() {
                         self.edit_labels_dialog.show(Rc::clone(&self.board));
                     }
-                })
+                });
+                if ui.button("Settings...").clicked() {
+                    self.edit_settings_dialog.show(Rc::clone(&self.board));
+                };
             });
         });
         CentralPanel::default().show(ctx, |ui| {
@@ -121,6 +125,7 @@ impl eframe::App for BoardBuilderApp {
         self.create_node_dialog.ui(ctx);
         self.edit_node_dialog.ui(ctx);
         self.edit_labels_dialog.ui(ctx);
+        self.edit_settings_dialog.ui(ctx);
     }
 }
 
@@ -169,6 +174,20 @@ 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) {
+                    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;
+                    painter.line_segment(
+                        [view.inv_xform(0.0, y_mid), view.inv_xform(left_node.x, left_node.y)],
+                        stroke
+                    );
+                    painter.line_segment(
+                        [view.inv_xform(right_node.x, right_node.y), view.inv_xform(1.0, y_mid)],
+                        stroke
+                    );
+                } else {
                     painter.line_segment(
                         [view.inv_xform(node.x, node.y), view.inv_xform(other_node.x, other_node.y)],
                         stroke,
@@ -176,6 +195,7 @@ impl BoardBuilderApp {
                 }
             }
         }
+    }
 
     fn dispatch_click(&mut self, btn: PointerButton, x: f32, y: f32) {
         use EditMode::*;
@@ -364,7 +384,6 @@ impl EditLabelsDialog {
     }
 }
 
-
 #[derive(Default)]
 struct StringDialog {
     string: String,
@@ -422,3 +441,26 @@ fn node_common_ui(ui: &mut Ui, node: &mut Node, board: &Board) {
             });
     }
 }
+
+#[derive(Default)]
+struct EditSettingsDialog {
+    open: bool,
+    board: Rc<RefCell<Board>>
+}
+
+impl EditSettingsDialog {
+    fn show(&mut self, board: Rc<RefCell<Board>>) {
+        self.board = board;
+        self.open = true;
+    }
+
+    fn ui(&mut self, ctx: &Context) {
+        Window::new("Settings")
+            .collapsible(false)
+            .open(&mut self.open)
+            .show(ctx, |ui| {
+                let mut board = self.board.borrow_mut();
+                ui.checkbox(&mut board.config.horizontal_wrapping, "Horizontal Wrapping");
+            });
+    }
+}

src/lib.rs

@@ -1,6 +1,18 @@
 use serde::{ Serialize, Deserialize };
 use std::collections::{ HashMap, HashSet };
 
+#[derive(Serialize, Deserialize, Debug)]
+#[serde(default)]
+pub struct Config {
+    pub horizontal_wrapping: bool,
+}
+impl Default for Config {
+    fn default() -> Self {
+        Config {
+            horizontal_wrapping: false,
+        }
+    }
+}
 #[derive(Serialize, Deserialize, Debug, Default, Clone)]
 #[serde(default)]
 pub struct Node {
@@ -16,14 +28,9 @@ pub struct Node {
 pub struct Board {
     pub labels: HashMap<String, HashSet<String>>,
     pub nodes: HashMap<usize, Node>,
+    pub config: Config,
 }
 impl Board {
-    pub fn new() -> Self {
-        let nodes = HashMap::new();
-        let labels = HashMap::new();
-        Board { nodes, labels }
-    }
-
     pub fn add_node(&mut self, x: f32, y: f32, name: String) {
         self.nodes.insert(self.next_id(), Node {
             x,
@@ -97,6 +104,12 @@ 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;