From b83a6701de7d44d5ed9721b50b631e44b57350bc Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Mon, 22 Mar 2021 03:17:52 +0000
Subject: [PATCH] Rectangle: Break out region() from hand.rs

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 src/hand.rs     | 13 +------------
 src/shapelib.rs | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/src/hand.rs b/src/hand.rs
index 80a28b64..5edf7b56 100644
--- a/src/hand.rs
+++ b/src/hand.rs
@@ -170,20 +170,9 @@ impl PieceTrait for Hand {
           dasharray,
           desc: new_desc,
         });
-        let centre = gpc.pos;
         let (region, views) = (||{
           dbgc!("claiming region");
-          let offset = (self.shape.outline.xy * 0.5)?;
-          let offset = offset.try_map(
-            |c| c.floor().to_i32().ok_or(CoordinateOverflow)
-          )?;
-          let region = AreaC(
-            [-1,1].iter().map(|&signum| Ok::<_,IE>({
-              (centre + (offset * signum)?)?
-            }))
-              .collect::<Result<ArrayVec<_>,_>>()?
-              .into_inner().unwrap()
-          );
+          let region = self.shape.outline.region(gpc.pos)?;
           let views = OwnerOccultationView {
             owner: player,
             owner_view: OccK::Visible,
diff --git a/src/shapelib.rs b/src/shapelib.rs
index d3e0222c..d29137cf 100644
--- a/src/shapelib.rs
+++ b/src/shapelib.rs
@@ -780,6 +780,24 @@ impl CircleDefn {
 #[derive(Clone,Copy,Debug,Serialize,Deserialize)]
 pub struct Rectangle { pub xy: PosC<f64> }
 
+impl Rectangle {
+  #[throws(CoordinateOverflow)]
+  pub fn region(&self, centre: Pos) -> AreaC<Coord> {
+    let offset = (self.xy * 0.5)?;
+    let offset = offset.try_map(
+      |c| c.floor().to_i32().ok_or(CoordinateOverflow)
+    )?;
+    let region = AreaC(
+      [-1,1].iter().map(|&signum| Ok::<_,CoordinateOverflow>({
+        (centre + (offset * signum)?)?
+      }))
+        .collect::<Result<ArrayVec<_>,_>>()?
+        .into_inner().unwrap()
+    );
+    region
+  }
+}
+
 #[dyn_upcast]
 impl OutlineTrait for Rectangle {
   #[throws(IE)]
-- 
2.30.2