shapelib::RectShape: Add a note

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/src/shapelib.rs b/src/shapelib.rs
index 4478dd2d636c44a570340c7f24744f0e53b63d11..f378e9c30be44c46c402d499523503351b007e65 100644 (file)
--- a/src/shapelib.rs
+++ b/src/shapelib.rs
@@ -622,6 +622,7 @@ impl OutlineCalculable {
 pub struct RectShape { pub xy: PosC<f64> }
 
 impl RectShape {
+  // Used by code elsewhere eg deck.rs for occultation boundaries etc.
   #[throws(CoordinateOverflow)]
   pub fn rect(&self, centre: Pos) -> RectC<Coord> {
     let offset = (self.xy * 0.5)?;