ported rivet to typst

src/vec.typ

@@ -0,0 +1,44 @@
+#let vec(x, y) = {
+  return (x: x, y: y)
+}
+
+#let add(v1, v2) = {
+  return vec(
+    v1.x + v2.x,
+    v1.y + v2.y
+  )
+}
+
+#let sub(v1, v2) = {
+  return vec(
+    v1.x - v2.x,
+    v1.y - v2.y
+  )
+}
+
+#let mul(v, f) = {
+  return vec(
+    v.x * f,
+    v.y * f
+  )
+}
+
+#let div(v, f) = {
+  return vec(
+    v.x / f,
+    v.y / f
+  )
+}
+
+#let mag(v) = {
+  return calc.sqrt(v.x * v.x + v.y * v.y)
+}
+
+#let normalize(v) = {
+  let m = mag(v)
+
+  if m == 0 {
+    return (x: 0, y: 0)
+  }
+  return div(v, m)
+}