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

crates/oa-core/src/routing.rs

@@ -1,6 +1,6 @@
 //! Deterministic, bounded diagram geometry. Only authored pins belong in the model;
 //! callers share this derived geometry for drawing, picking, fitting and export.
-use crate::projection::{self, PortAnchorSide, ProjectedEdge, ProjectedNode, ProjectedView};
+use crate::projection::{self, ProjectedEdge, ProjectedNode, ProjectedView};
 use crate::{Diagram, Id, Position, Project, RelationKind, Size};
 use std::cmp::Ordering;
 use std::collections::{BTreeMap, BTreeSet, BinaryHeap};
@@ -264,11 +264,7 @@ fn endpoints(node: &ProjectedNode, port: Option<Id>, view: &ProjectedView) -> Ve
             .iter()
             .find(|p| p.element == id && p.owner == node.id)
     }) {
-        let normal = match port.side {
-            PortAnchorSide::Left => pos(-1.0, 0.0),
-            PortAnchorSide::Right => pos(1.0, 0.0),
-            PortAnchorSide::Bottom => pos(0.0, 1.0),
-        };
+        let normal = port.side.normal();
         return vec![Endpoint {
             point: port.position,
             stub: pos(
@@ -1190,11 +1186,22 @@ impl BoundsBuilder {
     }
     fn finish(self) -> RoutingBounds {
         let (left, top, right, bottom) = self.extents.unwrap_or((0.0, 0.0, 0.0, 0.0));
+        // Subtraction and subsequent addition can round in opposite directions
+        // when an authored label extends far left/up. Bounds must still enclose
+        // every original point, including the far right and bottom edges.
+        let span = |start: f32, end: f32| {
+            let extent = end - start;
+            if start + extent < end {
+                extent.next_up()
+            } else {
+                extent
+            }
+        };
         RoutingBounds {
             position: pos(left, top),
             size: Size {
-                width: right - left,
-                height: bottom - top,
+                width: span(left, right),
+                height: span(top, bottom),
             },
         }
     }