Fix crash when drawing rect with no areanet

1 files changed, 9 insertions, 0 deletions

diff --git a/src/math/rect.rs b/src/math/rect.rs
index a8326bc..288c19d 100644
--- a/src/math/rect.rs
+++ b/src/math/rect.rs
@@ -3,6 +3,7 @@
 use super::{ExactSurface, LineSegment, Polygon, Vec2};
 //use alga::general::{Additive, Identity};
 use nalgebra::{RealField, Scalar};
+use num_traits::sign::{self, Signed};
 use num_traits::{NumCast, ToPrimitive, Zero};
 use serde::{Deserialize, Serialize};
 use std::ops::{Add, AddAssign, Sub};
@@ -147,6 +148,14 @@ impl<T: Scalar + Copy> Rect<T> {
             Vec2::new(T::zero(), move_y)
         }
     }
+
+    /// Calculate the area of the rectangle.
+    pub fn area(&self) -> T
+    where
+        T: Signed,
+    {
+        sign::abs(self.w) * sign::abs(self.h)
+    }
 }
 
 impl<T: Scalar + Copy> ExactSurface<T> for Rect<T>