1 files changed, 55 insertions, 0 deletions
diff --git a/src/Model/Vec2.elm b/src/Model/Vec2.elm
new file mode 100644
index 0000000..85ff008
--- /dev/null
+++ b/src/Model/Vec2.elm
@@ -0,0 +1,55 @@
+module Model.Vec2
+  ( Vec2
+  , add
+  , sub
+  , mul
+  , div
+  , norm
+  , clockwiseRotate90
+  , isNull
+  , originVec
+  ) where
+
+type alias Vec2 =
+  { x : Float
+  , y : Float
+  }
+
+add : Vec2 -> Vec2 -> Vec2
+add v1 v2 =
+  { x = v1.x + v2.x
+  , y = v1.y + v2.y
+  }
+
+sub : Vec2 -> Vec2 -> Vec2
+sub v1 v2 =
+  { x = v1.x - v2.x
+  , y = v1.y - v2.y
+  }
+
+mul : Float -> Vec2 -> Vec2
+mul m v =
+  { x = m * v.x
+  , y = m * v.y
+  }
+
+div : Vec2 -> Float -> Vec2
+div v d =
+  { x = v.x / d
+  , y = v.y / d
+  }
+
+norm : Vec2 -> Float
+norm v = sqrt(v.x ^ 2 + v.y ^ 2)
+
+clockwiseRotate90 : Vec2 -> Vec2
+clockwiseRotate90 v =
+  { x = -v.y
+  , y = v.x
+  }
+
+isNull : Vec2 -> Bool
+isNull v = (v.x == 0) && (v.y == 0)
+
+originVec : Vec2
+originVec = { x = 0, y = 0 }