feat: vertice operations

packages/math/index.js

@@ -7,3 +7,6 @@ export {Rectangle};
 
 import * as Vector from './vector';
 export {Vector};
+
+import * as Vertice from './vertice';
+export {Vertice};

packages/math/vertice.coffee

@@ -1,18 +0,0 @@
-# Vertice operations.
-
-# **Vertice** is a utility class to help with vertice operations. A vertice
-# is implemented as a 2-element array. Element 0 is *x* and element 1 is *y*.
-
-# Translate a vertice from an origin point using rotation and scale.
-export translate = (v, origin, rotation = 0, scale = 1) ->
-
-  difference = [v[0] - origin[0], v[1] - origin[1]]
-  magnitude = scale * Math.sqrt(
-    difference[0] * difference[0] + difference[1] * difference[1]
-  )
-  rotation += Math.atan2 difference[1], difference[0]
-
-  return [
-    origin[0] + Math.cos(rotation) * magnitude
-    origin[1] + Math.sin(rotation) * magnitude
-  ]

packages/math/vertice.js

@@ -0,0 +1,21 @@
+import * as Vector from './vector';
+
+// Vertice operations.
+
+// **Vertice** is a utility class to help with vertice operations. A vertice
+// is implemented as a 2-element array. Element 0 is *x* and element 1 is *y*.
+
+// Translate a vertice from an origin point using rotation and scale.
+export function translate (vertice, origin, rotation = 0, scale = 1) {
+  // Rotate.
+  const difference = Vector.sub(vertice, origin);
+  rotation += Vector.angle(difference);
+  const magnitude = Vector.magnitude(vertice, origin);
+  vertice = Vector.add(
+    origin,
+    Vector.scale([Math.cos(rotation), Math.sin(rotation)], magnitude)
+  );
+  // Scale.
+  vertice = Vector.scale(vertice, scale);
+  return vertice;
+}