1 files changed, 23 insertions, 0 deletions
diff --git a/src/Geometry.elm b/src/Geometry.elm
new file mode 100644
index 0000000..73e8d1f
--- /dev/null
+++ b/src/Geometry.elm
@@ -0,0 +1,23 @@
+module Geometry where
+
+import Vec2 (..)
+import Board (boardSize)
+
+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 : Float -> Vec2 -> Vec2
+inBoard 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
+      }