dice: Fix a radius/diameter confusion

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

diff --git a/src/dice.rs b/src/dice.rs
index f5b92e6a6f0d4a496d5f33a1e54352ac4a262bfd..4f8b6a50fd242441c8927daa688cbda23460e817 100644 (file)
--- a/src/dice.rs
+++ b/src/dice.rs
@@ -135,7 +135,7 @@ impl PieceSpec for Spec {
              else throw!(SpecError::MultipleFacesRequired) };
 
     let radius = if (0.5 .. 1.5).contains(&self.circle_scale) {
-      image.bbox_approx()?.size()?.len()? * self.circle_scale
+      image.bbox_approx()?.size()?.len()? * 0.5 * self.circle_scale
     } else {
       throw!(SpecError::InvalidSizeScale)
     };