// Unity C# reference source

// Copyright (c) Unity Technologies. For terms of use, see

// https://unity3d.com/legal/licenses/Unity_Reference_Only_License

using UnityEditor.AnimatedValues;

using System;

using UnityEngine;

using System.Collections.Generic;

using UnityEditorInternal;

namespace UnityEditor

{

[Serializable]

internal class CameraState

{

private static readonly Quaternion kDefaultRotation = Quaternion.LookRotation(new Vector3(0.0f, 0.0f, 1.0f));

private const float kDefaultViewSize = 10f;

private static readonly Vector3 kDefaultPivot = Vector3.zero;

private const float kDefaultFoV = 90f;

[SerializeField] private AnimVector3 m_Pivot = new AnimVector3(kDefaultPivot);

[SerializeField] private AnimQuaternion m_Rotation = new AnimQuaternion(kDefaultRotation);

[SerializeField] private AnimFloat m_ViewSize = new AnimFloat(kDefaultViewSize);

public float GetCameraDistance()

{

float fov = kDefaultFoV;

return m_ViewSize.value / Mathf.Tan(fov * 0.5f * Mathf.Deg2Rad);

}

public void FixNegativeSize()

{

float fov = kDefaultFoV;

if (m_ViewSize.value < 0)

{

float distance = m_ViewSize.value / Mathf.Tan(fov * 0.5f * Mathf.Deg2Rad);

Vector3 p = m_Pivot.value + m_Rotation.value * new Vector3(0, 0, -distance);

m_ViewSize.value = -m_ViewSize.value;

distance = m_ViewSize.value / Mathf.Tan(fov * 0.5f * Mathf.Deg2Rad);

m_Pivot.value = p + m_Rotation.value * new Vector3(0, 0, distance);

}

}

public void UpdateCamera(Camera camera)

{

camera.transform.rotation = m_Rotation.value;

camera.transform.position = m_Pivot.value + camera.transform.rotation * new Vector3(0, 0, -GetCameraDistance());

float farClip = Mathf.Max(1000f, 2000f * m_ViewSize.value);

camera.nearClipPlane = farClip * 0.000005f;

camera.farClipPlane = farClip;

}

public CameraState Clone()

{

CameraState newState = new CameraState();

newState.pivot.value = pivot.value;

newState.rotation.value = rotation.value;

newState.viewSize.value = viewSize.value;

return newState;

}

public void Copy(CameraState cameraStateIn)

{

pivot.value = cameraStateIn.pivot.value;

rotation.value = cameraStateIn.rotation.value;

viewSize.value = cameraStateIn.viewSize.value;

}

public AnimVector3 pivot { get { return m_Pivot; } set { m_Pivot = value; } }

public AnimQuaternion rotation { get { return m_Rotation; } set { m_Rotation = value; } }

public AnimFloat viewSize { get { return m_ViewSize; } set { m_ViewSize = value; } }

}

}