Add Clock class & use it from Player and SneakGame

GitOrigin-RevId: fe20c836ca693fdabad4ce72bfdf8952b59b735b

Shared/Clock.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace SemiColinGames {
+  class Clock {
+    private static TimeSpan modelTime = new TimeSpan();
+
+    public static void AddModelTime(double seconds) {
+      modelTime += TimeSpan.FromSeconds(seconds);
+    }
+
+    public static TimeSpan ModelTime {
+      get { return modelTime; }
+    }
+  }
+}

Shared/Player.cs

@@ -22,7 +22,6 @@ namespace SemiColinGames {
     private double swordSwingTime = 0;
     private double jumpTime = 0;
     private float ySpeed = 0;
-    private float totalModelTime = 0;
 
     public Player(Texture2D texture) {
       this.texture = texture;
@@ -35,7 +34,6 @@ namespace SemiColinGames {
     }
 
     public void Update(float modelTime, History<Input> input, List<Rectangle> collisionTargets) {
-      totalModelTime += modelTime;
       Point oldPosition = position;
       Vector2 movement = HandleInput(modelTime, input);
       position = new Point((int) (oldPosition.X + movement.X), (int) (oldPosition.Y + movement.Y));
@@ -130,7 +128,7 @@ namespace SemiColinGames {
     }
 
     private int SpriteIndex(Pose pose) {
-      int frameNum = ((int) (totalModelTime * 1000) / 125) % 4;
+      int frameNum = (int) Clock.ModelTime.TotalMilliseconds / 125 % 4;
       if (frameNum == 3) {
         frameNum = 1;
       }

Shared/Shared.projitems

@@ -10,6 +10,7 @@
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="$(MSBuildThisFileDirectory)Camera.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Clock.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Input.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Debug.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)FpsCounter.cs" />

Shared/SneakGame.cs

@@ -90,6 +90,7 @@ namespace SemiColinGames {
 
       if (!paused) {
         float modelTime = (float) gameTime.ElapsedGameTime.TotalSeconds;
+        Clock.AddModelTime(modelTime);
         List<Rectangle> collisionTargets = world.CollisionTargets();
         player.Update(modelTime, input, collisionTargets);
         camera.Update(player.Position);