src/Utils/Geometry.elm


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module Utils.Geometry exposing
  ( polarToCartesian
  , distance
  , inBoard
  )

import Model.Vec2 exposing (..)

polarToCartesian : Float -> Float -> Vec2
polarToCartesian angle dist =
  { x = dist * (cos angle)
  , y = dist * (sin angle)
  }

distance : Vec2 -> Vec2 -> Float
distance v1 v2 = sqrt((v2.x - v1.x)^2 + (v2.y - v1.y)^2)

inBoard : Vec2 -> Float -> Vec2 -> Vec2
inBoard boardSize size pos =
  let leftX = -boardSize.x / 2 + size
      rightX = boardSize.x / 2 - size
      bottomY = -boardSize.y / 2 + size
      topY = boardSize.y / 2 - size
  in  { x = clamp leftX rightX pos.x
      , y = clamp bottomY topY pos.y
      }