Improve ergonomics

src/main.rs

@@ -28,15 +28,15 @@ fn main() {
     let u2 = math::Unknown(2);
     // let u1 = eqn::Expr::from(1.);
     // let u2 = eqn::Expr::from(1.);
-    let origin = CPoint::new_single(Point2::new((0.).into(), (0.).into())).into_ref();
+    let origin = CPoint::new_single(Point2::new(0., 0.)).into_ref();
     // let p1 = Point::new_ref(Var::new_full(Point2::new((1.).into(), (1.).into())));
     let p1 = CPoint::new(
         Point2::new(0., 0.),
         Region2::Singleton(Point2::new((u1).into(), (u2).into())),
     )
     .into_ref();
-    let p2 = CPoint::new_full(Point2::new((4.).into(), (4.).into())).into_ref();
-    let p3 = CPoint::new_full(Point2::new((2.).into(), (2.).into())).into_ref();
+    let p2 = CPoint::new_full(Point2::new(4., 4.)).into_ref();
+    let p3 = CPoint::new_full(Point2::new(2., 2.)).into_ref();
     let mut points: Vec<PointRef> = vec![origin.clone(), p1.clone(), p2.clone(), p3.clone()];
     let print_points = |points: &Vec<PointRef>| {
         println!(

src/math/eqn.rs

@@ -3,6 +3,7 @@ use std::fmt;
 use super::expr::Expr;
 use super::unknown::*;
 use super::Scalar;
+use crate::math::expr::Expr::*;
 
 #[derive(Clone, Debug, PartialEq)]
 pub struct Eqn(pub Expr, pub Expr);
@@ -47,17 +48,18 @@ impl Eqn {
         if !self.has_unknown(for_u) {
             return None;
         }
+        trace!("solve: {}", self);
         let (l, r) = (
             self.0
-                .clone() /*.distribute()*/
+                .clone().distribute()
                 .simplify(),
             self.1
-                .clone() /*.distribute()*/
+                .clone().distribute()
                 .simplify(),
         );
         let (mut l, mut r) = ord_by_unkn(l, r, for_u)?;
         loop {
-            trace!("solve: {} == {}", l, r);
+            trace!("solve iter: {} == {}", l, r);
             let (new_l, new_r): (Expr, Expr) = match l {
                 Unkn(u) => return if u == for_u { Some(r.simplify()) } else { None },
                 Sum(es) => {

src/math/expr.rs

@@ -31,14 +31,16 @@ impl Unknowns for Exprs {
 
 fn write_separated_exprs(es: &Exprs, f: &mut fmt::Formatter, sep: &str) -> fmt::Result {
     let mut is_first = true;
+    write!(f, "(")?;
     for e in es {
         if is_first {
             is_first = false;
         } else {
             write!(f, "{}", sep)?
         }
-        write!(f, "({})", e)?
+        write!(f, "{}", e)?
     }
+    write!(f, ")")?;
     Ok(())
 }
 
@@ -451,7 +453,7 @@ impl fmt::Display for Expr {
             Const(c) => write!(f, "{}", c),
             Sum(es) => write_separated_exprs(es, f, " + "),
             Product(es) => write_separated_exprs(es, f, " * "),
-            Div(num, den) => write!(f, "({}) / ({})", num, den),
+            Div(num, den) => write!(f, "({} / {})", num, den),
             Neg(e) => write!(f, "-({})", e),
         }
     }

src/math/region.rs

@@ -150,7 +150,7 @@ impl fmt::Display for Line2 {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(
             f,
-            "{{ <x, y> = {} + {} * {} }}",
+            "{{ (x, y, t): ⟨x, y⟩ = {} + t{} & t ∈ {} }}",
             self.start, self.dir, self.extent
         )
     }

src/math/vec.rs

@@ -149,7 +149,7 @@ use std::fmt;
 
 impl<T: fmt::Display> fmt::Display for Point2<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "<{}, {}>", self.x, self.y)
+        write!(f, "⟨{}, {}⟩", self.x, self.y)
     }
 }
 
@@ -161,7 +161,7 @@ pub struct Rot2 {
 
 impl fmt::Display for Rot2 {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "<{}, {}>", self.cos, self.sin)
+        write!(f, "⟨{}, {}⟩", self.cos, self.sin)
     }
 }