Add persisted per-view port anchors and connection-aware border placement

crates/oa-core/src/model.rs

@@ -1264,6 +1264,34 @@ pub struct EdgeLabel {
     pub offset: Position,
 }
 pub const MAX_ROUTE_POINTS: usize = 128;
+/// Presentation side; independent of the semantic port direction.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
+pub enum PortAnchorSide {
+    Left,
+    Right,
+    Top,
+    Bottom,
+}
+impl PortAnchorSide {
+    pub fn normal(self) -> Position {
+        match self {
+            Self::Left => Position { x: -1., y: 0. },
+            Self::Right => Position { x: 1., y: 0. },
+            Self::Top => Position { x: 0., y: -1. },
+            Self::Bottom => Position { x: 0., y: 1. },
+        }
+    }
+}
+/// Manual position of a semantic child port on one owner placement.
+/// Absence from the placement's list selects automatic positioning.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct PortAnchor {
+    pub port: Id,
+    pub side: PortAnchorSide,
+    /// Fraction of the complete edge, from top (vertical) or left (horizontal).
+    pub offset: f32,
+}
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 #[serde(deny_unknown_fields)]
 pub struct NodePlacement {
@@ -1273,6 +1301,8 @@ pub struct NodePlacement {
     pub position: Position,
     pub size: Size,
     pub collapsed: bool,
+    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    pub port_anchors: Vec<PortAnchor>,
 }
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ArtifactRelation {
@@ -1660,6 +1690,7 @@ impl Project {
                 height: 94.,
             },
             collapsed: false,
+            port_anchors: Vec::new(),
         };
         if let Some(d) = self.diagrams.get_mut(&diagram) {
             d.nodes.insert(id, node);