From 2e70c76fb021e2b98a81a631b6b2eb9afaa09443 Mon Sep 17 00:00:00 2001
From: Eryn Wells <eryn@erynwells.me>
Date: Tue, 1 Aug 2017 07:54:29 -0700
Subject: [PATCH] [MetaballsKit] Make Field a class

---
 MetaballsKit/Metaballs.swift | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/MetaballsKit/Metaballs.swift b/MetaballsKit/Metaballs.swift
index dc638d9..c7ba542 100644
--- a/MetaballsKit/Metaballs.swift
+++ b/MetaballsKit/Metaballs.swift
@@ -28,7 +28,7 @@ public struct Ball {
     }
 }
 
-public struct Field {
+public class Field {
     public var size: CGSize {
         didSet {
             // Remove balls that fall outside the new bounds.
@@ -70,11 +70,7 @@ public struct Field {
         }
     }
 
-    public func sample(at point: CGPoint) throws -> CGFloat {
-        return 0.0
-    }
-
-    public mutating func add(ball: Ball) throws {
+    public func add(ball: Ball) throws {
         guard bounds.contains(ball.bounds) else {
             /// TODO: Throw an error.
             return