Screen Zooming

ScreenManager.cs

using UnityEngine;
using System.Collections;

public class ScreenManager : MonoBehaviour	
{
	public const float pixelsPerUnit = 32;
	public static Vector2 renderSize = new Vector2(512,256) / pixelsPerUnit;

	public float minHorizontalUnits = 12;
	public float verticalUnits = 4;
	public Transform _screenQuad;
	public Mesh _screenQuadMesh;
	
	bool _dirty = true;
	Resolution _resolution;

	void Awake()
	{
		// Force Unity to switch to fullscreen regardless of stored user preferences
		_resolution = Screen.currentResolution;
		Screen.SetResolution(_resolution.width, _resolution.height, true);

		_screenQuad = Require.ChildWithTag(Tags.ScreenQuad, this);
		_screenQuadMesh = Require.Component<MeshFilter>(_screenQuad).mesh;
	}

	// Update is called once per frame
	void Update() 
	{
		if (_dirty)
		{
			// TODO Maybe we need to do this in a kind of "OnResize" or just at game start..
			float heightPortion = 0.5f * verticalUnits / renderSize.y;
			_screenQuad.localScale = new Vector3(renderSize.x, verticalUnits, 1);

			Vector2[] uvs = _screenQuadMesh.uv;
			uvs[0] = new Vector2(0, 0.5f - heightPortion);
			uvs[1] = new Vector2(1, 0.5f + heightPortion);
			uvs[2] = new Vector2(1, 0.5f - heightPortion);
		 	uvs[3] = new Vector2(0, 0.5f + heightPortion);
			_screenQuadMesh.uv = uvs;
			
			// Always fit the full height of the game.
			float maxZoomHeight = Screen.height / (verticalUnits * pixelsPerUnit);
			
			// Show at least some portion of the width of the game.
			float maxZoomWidth = Screen.width / (minHorizontalUnits * pixelsPerUnit);
						
			float pixzoom = Mathf.Min(maxZoomHeight, maxZoomWidth);
			if (pixzoom > 1 && pixzoom < 5)
			{
				pixzoom = Mathf.Floor(pixzoom);
			}
			
			//		zoom = 1;
			//		this.camera.orthographicSize = screenDisplay.transform.localScale.y / 2 * zoom;
			this.GetComponent<Camera>().orthographicSize = Screen.height / pixelsPerUnit / 2 / pixzoom; 
		}
	}
}