Repurpose mat::Conductor to mat::Static

This will allow taking a material-independent snapshot of the SimState.

examples/em_reflection.rs

@@ -8,11 +8,11 @@ fn main() {
 
     for inset in 0..20 {
         for x in 0..width {
-            *driver.state.get_mut(x, inset).mat_mut() = mat::Conductor { conductivity: 0.1*(20.0 - inset as f64) }.into();
+            *driver.state.get_mut(x, inset).mat_mut() = mat::Static::conductor(0.1*(20.0 - inset as f64)).into();
         }
         for y in 0..100 {
-            *driver.state.get_mut(inset, y).mat_mut() = mat::Conductor { conductivity: 0.1*(20.0 - inset as f64) }.into();
-            *driver.state.get_mut(width-1 - inset, y).mat_mut() = mat::Conductor { conductivity: 0.1*(20.0 - inset as f64) }.into();
+            *driver.state.get_mut(inset, y).mat_mut() = mat::Static::conductor(0.1*(20.0 - inset as f64)).into();
+            *driver.state.get_mut(width-1 - inset, y).mat_mut() = mat::Static::conductor(0.1*(20.0 - inset as f64)).into();
         }
     }
     for y in 75..100 {
@@ -21,7 +21,7 @@ fn main() {
             // NB: different sources give pretty different values for this
             // NB: Simulation misbehaves for values > 10... Proably this model isn't so great.
             // Maybe use \eps or \xi instead of conductivity.
-            *driver.state.get_mut(x, y).mat_mut() = mat::Conductor { conductivity: 2.17 }.into();
+            *driver.state.get_mut(x, y).mat_mut() = mat::Static::conductor(2.17).into();
         }
     }
 

examples/ferromagnet.rs

@@ -4,11 +4,12 @@ fn main() {
     let width = 201;
     let height = 101;
     let mut driver = Driver::new(width, height, 1e-3 /* feature size */)
-        .with_y4m_renderer("ferromagnet.y4m");
+        .with_y4m_renderer("ferromagnet.y4m")
+        ;
 
     for y in 0..height {
         for x in 50..60 {
-            *driver.state.get_mut(x, y).mat_mut() = mat::Conductor { conductivity: 1.0e1 }.into();
+            *driver.state.get_mut(x, y).mat_mut() = mat::Static::conductor(1.0e1).into();
         }
         // for x in 30..40 {
         //     *state.get_mut(x, y).mat_mut() = mat::Conductor { conductivity: 1.0e8 }.into();
@@ -19,7 +20,7 @@ fn main() {
         //     }
         // }
         for x in 72..80 {
-            *driver.state.get_mut(x, y).mat_mut() = mat::Conductor { conductivity: 1.0e1 }.into();
+            *driver.state.get_mut(x, y).mat_mut() = mat::Static::conductor(1.0e1).into();
         }
     }
     for y in 40..60 {

src/mat.rs

@@ -22,14 +22,27 @@ pub trait Material {
 }
 
 #[derive(Clone, Default)]
-pub struct Conductor {
+pub struct Static {
     pub conductivity: f64,
+    pub mz: f64,
 }
 
-impl Material for Conductor {
+impl Static {
+    pub fn conductor(conductivity: f64) -> Self {
+        Self {
+            conductivity,
+            ..Default::default()
+        }
+    }
+}
+
+impl Material for Static {
     fn conductivity(&self) -> f64 {
         self.conductivity
     }
+    fn mz(&self) -> f64 {
+        self.mz
+    }
 }
 
 #[derive(Clone, Default)]
@@ -194,14 +207,14 @@ impl Material for PiecewiseLinearFerromagnet {
 #[enum_dispatch(Material)]
 #[derive(Clone)]
 pub enum GenericMaterial {
-    Conductor(Conductor),
+    Static(Static),
     // ComsolFerromagnet(ComsolFerromagnet),
     PiecewiseLinearFerromagnet(PiecewiseLinearFerromagnet)
 }
 
 impl Default for GenericMaterial {
     fn default() -> Self {
-        Conductor::default().into()
+        Static::default().into()
     }
 }