Move Render Methods into SimulationService

lib/components/configuration_component.dart

@@ -49,6 +49,6 @@ class ConfigurationComponent {
   ConfigurationComponent(this.engine, this.sim);
 
   void onEdgesClicked() {
-    engine.toggleGrid();
+    sim.toggleGrid();
   }
 }

lib/components/simulation_component.dart

@@ -2,6 +2,7 @@ import 'dart:html' as html;
 
 import 'package:angular/angular.dart';
 import 'package:rules_of_living/service/engine_service.dart';
+import 'package:rules_of_living/service/simulation_service.dart';
 
 @Component(
   selector: 'gol-simulation',
@@ -11,8 +12,9 @@ import 'package:rules_of_living/service/engine_service.dart';
 )
 class SimulationComponent implements OnInit {
   final EngineService engine;
+  final SimulationService sim;
 
-  SimulationComponent(this.engine);
+  SimulationComponent(this.engine, this.sim);
 
   @override
   void ngOnInit() {
@@ -29,6 +31,6 @@ class SimulationComponent implements OnInit {
     
     the canvas did not load correctly :(
     ''', canvas.width / 2 - 50, canvas.height / 2);
-    engine.canvas = canvas;
+    sim.canvas = canvas;
   }
 }

lib/service/engine_service.dart

@@ -1,5 +1,3 @@
-import 'dart:html' as html;
-
 import 'package:rules_of_living/src/Engine.dart';
 
 class EngineService {
@@ -43,14 +41,6 @@ class EngineService {
   int get simSpeed => engine.stepsPerSecond;
   void set simSpeed(int val) => engine.stepsPerSecond = val;
 
-  //TODO split into RenderService when rendering is decoupled from engine.
-  html.CanvasElement get canvas => engine.canvas;
-  void set canvas(html.CanvasElement canvas) => engine.canvas = canvas;
-
-  void toggleGrid() {
-    engine.toggleEdgeRendering();
-  }
-
   void reset() {
     engine.reset();
   }

lib/service/simulation_service.dart

@@ -1,3 +1,4 @@
+import 'dart:html' as html;
 import 'dart:math';
 
 import 'package:rules_of_living/service/engine_service.dart';
@@ -24,4 +25,12 @@ class SimulationService {
   }
 
   Point<int> get gridSize => _engine.engine.gridSize;
+
+  //TODO split into RenderService when rendering is decoupled from engine.
+  html.CanvasElement get canvas => _engine.engine.canvas;
+  void set canvas(html.CanvasElement canvas) => _engine.engine.canvas = canvas;
+
+  void toggleGrid() {
+    _engine.engine.toggleEdgeRendering();
+  }
 }