src/Vec2.elm


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

module Vec2 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
  }

isNull : Vec2 -> Bool
isNull v = (v.x == 0) && (v.y == 0)

originVec : Vec2
originVec = { x = 0, y = 0 }