0

我有一个使用 MonoGame 框架的 WP8 项目。我有一些代码可以识别水平和垂直拖动事件并执行操作，但我似乎从未收到这些事件。我确实得到了一个 FreeDrag 手势，但 Delta 总是 NaN。

我在游戏的 Initialize 方法中初始化 TouchPanel.EnabledGestures 如下：

  protected override void Initialize()
  {
     // TODO: Add your initialization logic here
     base.Initialize();

     TouchPanel.EnabledGestures = GestureType.HorizontalDrag | GestureType.FreeDrag;
  }

我有一个检查手势类型的方法，如下所示：

  private void CheckUserGesture()
  {
     while (TouchPanel.IsGestureAvailable)
     {
        var gesture = TouchPanel.ReadGesture();

        switch(gesture.GestureType)
        {
           case GestureType.DragComplete:
              System.Diagnostics.Debug.WriteLine("Drag Complete");
              break;

           case GestureType.FreeDrag:
              System.Diagnostics.Debug.WriteLine("Drag Complete");
              break;

           case GestureType.HorizontalDrag:
              if (gesture.Delta.X < 0)
                 gameVm.MoveLeft(Math.Abs((int)gesture.Delta.X));
              if (gesture.Delta.X > 0)
                 gameVm.MoveRight((int)gesture.Delta.X);

              break;

           case GestureType.VerticalDrag:
              if (gesture.Delta.Y > 0)
                 gameVm.MoveDown(Math.Abs((int)gesture.Delta.Y));
              break;

           case GestureType.Tap:
              System.Diagnostics.Debug.WriteLine("Rotating Shape Due To Tap Command");
              gameVm.RotateClockwise();
              break;
        }
     }
  }

这在 Update 方法中调用：

  protected override void Update(GameTime gameTime)
  {
     base.Update(gameTime);

     // TODO: Add your update logic here
     //CheckTouchGesture();
     CheckUserGesture();
     gameVm.UpdateGame((int)gameTime.ElapsedGameTime.TotalMilliseconds);
  }

我也尝试过使用 TouchState：

  private void CheckTouchGesture()
  {
     var touchCol = TouchPanel.GetState();

     foreach (var touch in touchCol)
     {
        // You're looking for when they finish a drag, so only check
        // released touches.
        if (touch.State != TouchLocationState.Released)
           continue;

        TouchLocation prevLoc;

        // Sometimes TryGetPreviousLocation can fail. Bail out early if this happened
        // or if the last state didn't move
        if (!touch.TryGetPreviousLocation(out prevLoc) || prevLoc.State != TouchLocationState.Moved)
           continue;

        // get your delta
        var delta = touch.Position - prevLoc.Position;

        // Usually you don't want to do something if the user drags 1 pixel.
        if (delta.LengthSquared() < DragTolerence)
           continue;

        if (delta.X < 0)
           gameVm.MoveLeft(Math.Abs((int)delta.X));
        else if (delta.X > 0)
           gameVm.MoveRight((int)delta.X);
        else if (delta.Y > 0)
           gameVm.MoveDown((int)delta.Y);
     }
  }

但同样，增量总是 NaN。

有什么我可能需要初始化的东西吗？我尝试了 EnabledGestures 类型的各种组合，但仍然无法让拖动事件起作用。弗里克也不起作用。

Tap之类的东西还不错。

谢谢

4

1 回答 1

0

I think this is broken on the current release of MonoGame ( Version 3.0.1, Release date: Mar 3 2013 ).

Building the latest from the GitHub developer branch: https://github.com/mono/MonoGame.git

(NOTE: I also built SharpDX too from here: https://github.com/sharpdx/SharpDX)

Seems to fix a lot of my problems

I'm not 100% convinced it is fully working though.
Using the touch.TryGetPreviousLocation() as shown in the code above always returns the same position as the current position so doing var delta = loc.Position - preLoc.Postion always results in 0.

At least I'm receiving the drag gestures now.

于 2013-07-24T20:20:19.460 回答