Sketch: infinite construction lines (#1359) (#1547)

Thanks @DuBearte.

crates/sketch/src/link.rs

@@ -655,6 +655,7 @@ impl Sketch {
                 link: Some(id.to_string()),
                 centerline: false,
                 fixed: false,
+                infinite: false,
             });
         }
         for li in &lay.lone {

crates/sketch/src/model.rs

@@ -169,6 +169,11 @@ pub struct Curve {
     /// Fixed (locked): its points and radius are constants for the solver.
     #[serde(default, skip_serializing_if = "std::ops::Not::not")]
     pub fixed: bool,
+    /// Infinite line type (#1359), for lines only: construction geometry drawn across the whole
+    /// view, through its two points, which fix where it lies and which way it runs. Never part of
+    /// a profile (it is construction too).
+    #[serde(default, skip_serializing_if = "std::ops::Not::not")]
+    pub infinite: bool,
 }
 
 /// Geometric constraints and dimensions. Indices refer to `Sketch::points` (`p`, `q`) or
@@ -735,6 +740,7 @@ impl Sketch {
             link: None,
             centerline: false,
             fixed: false,
+            infinite: false,
         });
         Ok(self.curves.len() - 1)
     }
@@ -772,6 +778,7 @@ impl Sketch {
             link: None,
             centerline: false,
             fixed: false,
+            infinite: false,
         });
         Ok(self.curves.len() - 1)
     }
@@ -806,6 +813,7 @@ impl Sketch {
             link: None,
             centerline: false,
             fixed: false,
+            infinite: false,
         });
         Ok(self.curves.len() - 1)
     }
@@ -1376,7 +1384,7 @@ impl Sketch {
             }
         };
         let id = self.curve_id(id, prefix)?;
-        self.curves.push(Curve { id, kind, construction: false, reversed: false, link: None, centerline: false, fixed: false });
+        self.curves.push(Curve { id, kind, construction: false, reversed: false, link: None, centerline: false, fixed: false, infinite: false });
         Ok(self.curves.len() - 1)
     }
 

crates/sketch/src/offset_topology.rs

@@ -27,13 +27,21 @@ pub struct OffsetRoleFlags {
     pub centerline: bool,
     pub reversed: bool,
     pub fixed: bool,
+    #[serde(default, skip_serializing_if = "std::ops::Not::not")]
+    pub infinite: bool,
 }
 impl OffsetRoleFlags {
     fn is_default(&self) -> bool {
         *self == Self::default()
     }
     fn of(curve: &Curve) -> Self {
-        Self { construction: curve.construction, centerline: curve.centerline, reversed: curve.reversed, fixed: curve.fixed }
+        Self {
+            construction: curve.construction,
+            centerline: curve.centerline,
+            reversed: curve.reversed,
+            fixed: curve.fixed,
+            infinite: curve.infinite,
+        }
     }
 }
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
@@ -614,6 +622,7 @@ impl Sketch {
                     link: None,
                     centerline: false,
                     fixed: false,
+                    infinite: false,
                 });
                 outputs.push(output);
             }
@@ -767,6 +776,7 @@ impl Sketch {
                         link: None,
                         centerline: role.flags.centerline,
                         fixed: role.flags.fixed,
+                        infinite: role.flags.infinite,
                     });
                 }
                 outputs.push(role.output.clone());

crates/sketch/src/profiles.rs

@@ -558,7 +558,7 @@ fn find_profiles_bounded(sk: &Sketch, max_edges: usize) -> Vec<Profile> {
     let mut whole_graph_complete = true;
     let mut expected = std::collections::HashMap::<usize, Vec<usize>>::new();
     for (ci, c) in sk.curves.iter().enumerate() {
-        if c.construction || c.centerline {
+        if c.construction || c.centerline || c.infinite {
             continue;
         }
         if matches!(c.kind, CurveKind::Line { .. } | CurveKind::Arc { .. } | CurveKind::Circle { .. }) {