Switch back to custom geometry types, unified with layout primitives 🏞

1 files changed, 47 insertions, 0 deletions

diff --git a/src/geom/macros.rs b/src/geom/macros.rs
new file mode 100644
index 00000000..615eb31c
--- /dev/null
+++ b/src/geom/macros.rs
@@ -0,0 +1,47 @@
+/// Implement the `Sub` trait based on existing `Neg` and `Add` impls.
+macro_rules! sub_impl {
+    ($a:ident - $b:ident -> $c:ident) => {
+        impl Sub<$b> for $a {
+            type Output = $c;
+
+            fn sub(self, other: $b) -> $c {
+                self + -other
+            }
+        }
+    };
+}
+
+/// Implement an assign trait based on an existing non-assign trait.
+macro_rules! assign_impl {
+    ($a:ident += $b:ident) => {
+        impl AddAssign<$b> for $a {
+            fn add_assign(&mut self, other: $b) {
+                *self = *self + other;
+            }
+        }
+    };
+
+    ($a:ident -= $b:ident) => {
+        impl SubAssign<$b> for $a {
+            fn sub_assign(&mut self, other: $b) {
+                *self = *self - other;
+            }
+        }
+    };
+
+    ($a:ident *= $b:ident) => {
+        impl MulAssign<$b> for $a {
+            fn mul_assign(&mut self, other: $b) {
+                *self = *self * other;
+            }
+        }
+    };
+
+    ($a:ident /= $b:ident) => {
+        impl DivAssign<$b> for $a {
+            fn div_assign(&mut self, other: $b) {
+                *self = *self / other;
+            }
+        }
+    };
+}