spans now good (other than direction) + refactor

src/base/num.rs

@@ -0,0 +1,50 @@
+pub trait UINum {
+    fn to_f32(self) -> f32;
+}
+
+impl UINum for f32 {
+    fn to_f32(self) -> f32 {
+        self
+    }
+}
+
+impl UINum for u32 {
+    fn to_f32(self) -> f32 {
+        self as f32
+    }
+}
+
+impl UINum for i32 {
+    fn to_f32(self) -> f32 {
+        self as f32
+    }
+}
+
+#[derive(Copy, Clone, Eq, PartialEq)]
+pub enum Axis {
+    X,
+    Y,
+}
+
+#[derive(Clone, Copy, Eq, PartialEq)]
+pub struct Dir {
+    pub axis: Axis,
+    pub sign: Sign,
+}
+
+impl Dir {
+    pub const fn new(axis: Axis, dir: Sign) -> Self {
+        Self { axis, sign: dir }
+    }
+
+    pub const LEFT: Self = Self::new(Axis::X, Sign::Neg);
+    pub const RIGHT: Self = Self::new(Axis::X, Sign::Pos);
+    pub const UP: Self = Self::new(Axis::Y, Sign::Neg);
+    pub const DOWN: Self = Self::new(Axis::Y, Sign::Pos);
+}
+
+#[derive(Clone, Copy, Eq, PartialEq)]
+pub enum Sign {
+    Neg,
+    Pos,
+}