Fix errors in Pressure and add formatting.

Also update example.

Author: thejpster

examples/format_test.rs

@@ -1,11 +1,15 @@
 extern crate measurements;
 use measurements::Temperature;
 use measurements::Length;
+use measurements::Pressure;
 fn main() {
-	let t = Temperature::from_celsius(0.1);
-	let d = Length::from_meters(10000.1);
-	println!("{0:.9} outside", t);
-	println!("{0:.9} C outside", t.as_celsius());
-	println!("{0:.3} away", d);
-	println!("{0:.3} m away", d.as_meters());
+	let t = Temperature::from_celsius(123.456);
+	let d = Length::from_meters(123.456);
+	let p = Pressure::from_pascals(123.456);
+	println!("Temp of {0:.5} outside", t);
+	println!("Temp of {0:.5} C outside", t.as_celsius());
+	println!("Distance of {0:.5}", d);
+	println!("Distance of {0:.5} m", d.as_meters());
+	println!("Pressure of {0:.5}", p);
+	println!("Pressure of {0:.5} Pa", p.as_pascals());
 }

src/pressure.rs

@@ -23,11 +23,11 @@ impl Pressure {
     }
 
     pub fn from_pascals(pascals: f64) -> Pressure {
-        Self::from_hectopascals(pascals * 100.0)
+        Self::from_millibars(pascals / 100.0)
     }
 
     pub fn from_kilopascals(kilopascals: f64) -> Pressure {
-        Self::from_hectopascals(kilopascals / 10.0)
+        Self::from_millibars(kilopascals * 10.0)
     }
 
     pub fn from_millibars(millibars: f64) -> Pressure {
@@ -89,6 +89,8 @@ implement_measurement! { Pressure }
 
 impl ::std::fmt::Display for Pressure {
     fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
-        write!(f, "{:.1} Pa", self.as_pascals())
+        let p = f.precision().unwrap_or(1);
+        let w = f.width().unwrap_or(0);
+        write!(f, "{value:width$.prec$}\u{00A0}Pa", prec=p, width=w, value=self.as_pascals())
     }
 }