Add ability to move by a single pixel in DEBUG builds.

Fixes #15.

Also enables the LeftShoulder + RightShoulder + [BUTTON] combos only while
we're in DEBUG mode.

Shared/Input.cs

@@ -4,29 +4,40 @@ using Microsoft.Xna.Framework.Input;
 namespace SemiColinGames {
   public readonly struct Input {
     public readonly Vector2 Motion;
+    // If true, the player's x-motion should be treated as an absolute number of pixels in a given
+    // direction, regardless of modeled time. This is only enabled in DEBUG builds.
+    public readonly bool IsAbsoluteMotion;
     public readonly bool Jump;
     public readonly bool Attack;
 
     public readonly bool Pause;
     public readonly bool Debug;
+    // Button combos for Exit / Restart / FullScreen only work in DEBUG builds.
+    // Keyboard controls always work for these actions.
     public readonly bool Exit;
     public readonly bool Restart;
     public readonly bool FullScreen;
 
     public Input(GamePadState gamePad, KeyboardState keyboard) {
       Motion = new Vector2();
+      IsAbsoluteMotion = false;
 
       // We check for debugging buttons first. If any are pressed, we suppress normal input;
       // other button-presses correspond to special debugging things.
       Exit = keyboard.IsKeyDown(Keys.Escape);
       Restart = keyboard.IsKeyDown(Keys.F5);
       FullScreen = keyboard.IsKeyDown(Keys.F12);
+
+#if DEBUG
       if (gamePad.IsButtonDown(Buttons.LeftShoulder) &&
           gamePad.IsButtonDown(Buttons.RightShoulder)) {
+        IsAbsoluteMotion = true;
         Exit |= gamePad.IsButtonDown(Buttons.Start);
         Restart |= gamePad.IsButtonDown(Buttons.Back);
         FullScreen |= gamePad.IsButtonDown(Buttons.Y);
       }
+#endif
+
       if (Exit || Restart || FullScreen) {
         Jump = false;
         Attack = false;
@@ -67,6 +78,7 @@ namespace SemiColinGames {
       if (down && !up) {
         Motion.Y = -1;
       }
+
     }
   }
 }

Shared/Player.cs

@@ -189,6 +189,15 @@ namespace SemiColinGames {
       result.Y = ySpeed * modelTime;
       ySpeed += gravity * modelTime;
       swordSwingTime -= modelTime;
+
+      if (input[0].IsAbsoluteMotion) {
+        if (input[1].Motion.X == 0) {
+          result.X = input[0].Motion.X;
+        } else {
+          result.X = 0;
+        }
+      }
+
       return result;
     }