Better debug implementations for numeric types

src/eval/value.rs

@@ -531,7 +531,7 @@ mod tests {
         test(Length::pt(5.5), "5.5pt");
         test(Angle::deg(90.0), "90deg");
         test(Relative::one() / 2.0, "50%");
-        test(Relative::new(0.3) + Length::cm(2.0), "30% + 2cm");
+        test(Relative::new(0.3) + Length::cm(2.0), "30% + 56.69pt");
         test(Fractional::one() * 7.55, "7.55fr");
         test(Color::Rgba(RgbaColor::new(1, 1, 1, 0xff)), "#010101");
 

src/geom/angle.rs

@@ -58,15 +58,7 @@ impl Angle {
 
 impl Debug for Angle {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        // Format with the unit that yields the shortest output, preferring
-        // degrees when tied.
-        let unit = [AngularUnit::Deg, AngularUnit::Rad]
-            .iter()
-            .copied()
-            .min_by_key(|&unit| self.to_unit(unit).to_string().len())
-            .unwrap();
-
-        write!(f, "{}{:?}", self.to_unit(unit), unit)
+        write!(f, "{}deg", round_2(self.to_deg()))
     }
 }
 

src/geom/fr.rs

@@ -48,7 +48,7 @@ impl Fractional {
 
 impl Debug for Fractional {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        write!(f, "{}fr", self.get())
+        write!(f, "{}fr", round_2(self.get()))
     }
 }
 

src/geom/length.rs

@@ -139,17 +139,7 @@ impl Length {
 
 impl Debug for Length {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        use LengthUnit::*;
-
-        // Format with the unit that yields the shortest output, preferring
-        // larger / metric units when tied.
-        let unit = [Cm, Mm, In, Pt]
-            .iter()
-            .copied()
-            .min_by_key(|&unit| self.to_unit(unit).to_string().len())
-            .unwrap();
-
-        write!(f, "{}{:?}", self.to_unit(unit), unit)
+        write!(f, "{}pt", round_2(self.to_pt()))
     }
 }
 
@@ -264,12 +254,4 @@ mod tests {
     fn test_length_unit_conversion() {
         assert!((Length::mm(150.0).to_cm() - 15.0) < 1e-4);
     }
-
-    #[test]
-    fn test_length_formatting() {
-        assert_eq!(format!("{:?}", Length::pt(23.0)), "23pt");
-        assert_eq!(format!("{:?}", Length::pt(-28.3465)), "-1cm");
-        assert_eq!(format!("{:?}", Length::cm(12.728)), "12.728cm");
-        assert_eq!(format!("{:?}", Length::cm(4.5)), "45mm");
-    }
 }

src/geom/mod.rs

@@ -59,3 +59,8 @@ pub trait Get<Index> {
         *self.get_mut(index) = component;
     }
 }
+
+/// Round a float to two decimal places.
+fn round_2(value: f64) -> f64 {
+    (value * 100.0).round() / 100.0
+}

src/geom/relative.rs

@@ -51,7 +51,7 @@ impl Relative {
 
 impl Debug for Relative {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        write!(f, "{}%", 100.0 * self.get())
+        write!(f, "{}%", round_2(100.0 * self.get()))
     }
 }