鼠标事件不会更新winforms中的相机旋转

时间:2013-08-17 15:18:38

标签: c# winforms mouseevent xna-4.0

我的应用程序有一个自定义面板,用于在WinForm中显示XNA屏幕。我目前显示的测试模型没有问题,现在正在进行相机移动。我的相机是一个自由相机(不一定要看任何特定的目标),但我一直无法让鼠标在自己的轴上更新相机的偏航和俯仰。我认为我的更新方法可能出了问题,但事实并非如此,因为相机会使用KeyboardState更新前后移动。但我不知道为什么MouseState无效。

FreeCamera.cs

using XNAButtonState = Microsoft.Xna.Framework.Input.ButtonState;
....
MouseState pastMouseState;
private float rotationSpeed_ = 1f / 60f;
private float yaw_, pitch_;
...

private void updateMatrix()
    {

        Matrix rotationMatrix = Matrix.CreateRotationX(pitch_) *
                                Matrix.CreateRotationY(yaw_);

        Vector3 forward = new Vector3(0, 0, 1);
        forward = Vector3.Transform(forward, rotationMatrix);

        viewMatrix_ = Matrix.CreateLookAt(Position, Position + forward, Up);
        projectionMatrix_ = Matrix.CreatePerspectiveFieldOfView(
            MathHelper.PiOver4, 16.0f / 9.0f, 0.1f, 100000.0f);
    }

 private void cameraInput()
    {
        KeyboardState keyboardState = Keyboard.GetState(); <-- updates
        currentMouseState = Mouse.GetState();              <-- not updating

        if (currentMouse.LeftButton == XNAButtonState.Pressed)         
            pitch_ -= rotationSpeed_;

        if (keyboardState.IsKeyDown(Keys.W))
            move(1);
        if (keyboardState.IsKeyDown(Keys.S))
            move(-1);

        pastMouseState = currentMouseState;
     }


public void update()
    {
        cameraInput();
        updateMatrix();

1 个答案:

答案 0 :(得分:1)

要使用XNA的鼠标API(而不是WinForm事件),您必须正确设置Mouse.WindowHandle MSDN)。

如果您使用的是official samples,那么将其放入MainForm的构造函数中就可以了:

Mouse.WindowHandle = this.Handle;

(当然using Microsoft.Xna.Framework.Input;