Interaction between Unity and Windows Phone

In this guide we will interact between Unity and Windows Phone by making Windows Phone aware of game state. Specifically, we will have a sphere moving on the screen which can be stopped/made to move using Unity GUI.Button. Windows Phone will display a XAML text block which will accurately say the current state of the sphere (whether it’s moving or not).

We begin by creating a new Unity Project. Add a sphere and a new C# script to the scene, and add this code to the script:

using System;
using UnityEngine;

public class SphereScript : MonoBehaviour
{
    private bool m_IsMoving = true;
    private bool m_IsMovingLeft = false;

    public Camera GameCamera;
    public event Action<bool> SphereStateChanged;
    public bool IsSphereMoving { get { return m_IsMoving; } }

    void Start()
    {
        if (GameCamera == null)
        {
            throw new Exception("Camera is not attached to the sphere script!");
        }
    }

    void FixedUpdate()
    {
        if (!m_IsMoving)
        {
            return;
        }

        if (m_IsMovingLeft)
        {
            transform.position -= new Vector3(0.2f, 0.0f);

            if (GameCamera.WorldToScreenPoint(transform.position).x < 100.0f)
            {
                m_IsMovingLeft = false;
            }
        }
        else
        {
            transform.position += new Vector3(0.2f, 0.0f);

            if (GameCamera.WorldToScreenPoint(transform.position).x > Screen.width - 100.0f)
            {
                m_IsMovingLeft = true;
            }
        }
    }

    void OnGUI()
    {
        var buttonText = m_IsMoving ? "Stop sphere" : "Start sphere movement";

        if (GUI.Button(new Rect(0, 0, Screen.width, 40), buttonText))
        {
            m_IsMoving = !m_IsMoving;

            if (SphereStateChanged != null)
            {
                SphereStateChanged(m_IsMoving);
            }
        }
    }
}

Don’t forget to attach main camera to the sphere script in the inspector.

Build the project for Windows Phone 8 and open the resulting Visual Studio solution.

Add a TextBlock XAML element to MainPage.xaml file:

Add sphere state changed event handling method. Remember, XAML can only be interacted with through the UI thread, so we use Dispatcher to execute our method there:

Finally, attach that handler method to our sphere state changed event which we declared in the script.

Result

Attachments

• WP8UnityInteraction.zip