ZhenShiXunYouJi2/Assets/Scripts/WorldMapCameraOperator.cs

using System;
using UnityEngine;
using UnityEngine.EventSystems;

[RequireComponent(typeof(BoxCollider2D))]
public class WorldMapCameraOperator : MonoBehaviour, IPointerClickHandler, IPointerDownHandler, IPointerUpHandler, IBeginPinchHandler, IPinchHandler, IEndPinchHandler, IEventSystemHandler
{
	private void Awake()
	{
		this._pinching = false;
		this._animationMode = WorldMapCameraOperator.AnimationMode.None;
		this._cameraZ = this._cameraToOperate.transform.position.z;
	}

	private void Start()
	{
		this.RestrictCameraBounds();
	}

	private void LateUpdate()
	{
		this.SoftRestrictCameraZoom(Time.deltaTime);
		if (this._animationMode == WorldMapCameraOperator.AnimationMode.None)
		{
			return;
		}
		Transform transform = this._cameraToOperate.transform;
		float num = this._cameraToOperate.orthographicSize * 2f;
		float num2 = num * this._cameraToOperate.aspect;
		if (this._animationMode == WorldMapCameraOperator.AnimationMode.Velocity)
		{
			this._animationVelocity *= 0.95f;
			Vector3 zero = Vector3.zero;
			zero.x = -this._animationVelocity.x * Time.deltaTime / (float)this._cameraToOperate.pixelWidth * num2;
			zero.y = -this._animationVelocity.y * Time.deltaTime / (float)this._cameraToOperate.pixelHeight * num;
			transform.localPosition += zero;
			if (this._animationVelocity.magnitude < 5f)
			{
				this._animationMode = WorldMapCameraOperator.AnimationMode.None;
			}
		}
		else if (this._animationMode == WorldMapCameraOperator.AnimationMode.Destination)
		{
			float num3 = this._destinationAnimationCurve.Evaluate((Time.time - this._animationStartTime) / this._destinationAnimationDuration);
			Vector3 position = transform.position;
			if (num3 >= 1f)
			{
				position.x = this._animationDestination.x;
				position.y = this._animationDestination.y;
				this._animationMode = WorldMapCameraOperator.AnimationMode.None;
			}
			else
			{
				position = Vector2.Lerp(this._animationSource, this._animationDestination, num3);
				position.z = this._cameraZ;
			}
			transform.position = position;
		}
		this.RestrictCameraBounds();
	}

	public void OnPointerClick(PointerEventData eventData)
	{
	}

	public void OnPointerDown(PointerEventData eventData)
	{
		if (this._animationMode != WorldMapCameraOperator.AnimationMode.None)
		{
			this._animationMode = WorldMapCameraOperator.AnimationMode.None;
		}
	}

	public void OnPointerUp(PointerEventData eventData)
	{
	}

	public void OnBeginPinch(PinchEventData pinchEvent)
	{
		this._pinching = true;
		this._pinchingOrthoSize = this._cameraToOperate.orthographicSize;
		if (this._animationMode != WorldMapCameraOperator.AnimationMode.None)
		{
			this._animationMode = WorldMapCameraOperator.AnimationMode.None;
		}
	}

	public void OnPinch(PinchEventData pinchEvent)
	{
		this._pinchingOrthoSize /= pinchEvent.ScaleDelta;
		float num = this.CalculateZoomOffset(this._pinchingOrthoSize);
		float num2 = this._minZoom - this._maxZoom;
		if (num < 0f)
		{
			num2 /= 2f;
		}
		float num3 = this.DampenOffset(num, num2);
		float orthographicSize = this._pinchingOrthoSize + num - num3;
		Transform transform = this._cameraToOperate.transform;
		float num4 = this._cameraToOperate.orthographicSize * 2f;
		float num5 = num4 * this._cameraToOperate.aspect;
		Vector2 zero = Vector2.zero;
		zero.x = transform.localPosition.x - num5 * 0.5f + pinchEvent.Center.x / (float)this._cameraToOperate.pixelWidth * num5;
		zero.y = transform.localPosition.y - num4 * 0.5f + pinchEvent.Center.y / (float)this._cameraToOperate.pixelHeight * num4;
		Vector3 zero2 = Vector3.zero;
		zero2.x = -pinchEvent.Delta.x / (float)this._cameraToOperate.pixelWidth * num5;
		zero2.y = -pinchEvent.Delta.y / (float)this._cameraToOperate.pixelHeight * num4;
		zero2.x += (transform.localPosition.x - zero.x) * (1f - pinchEvent.ScaleDelta);
		zero2.y += (transform.localPosition.y - zero.y) * (1f - pinchEvent.ScaleDelta);
		transform.localPosition += zero2;
		this._cameraToOperate.orthographicSize = orthographicSize;
		this.RestrictCameraBounds();
	}

	public void OnEndPinch(PinchEventData pinchEvent)
	{
		if (this._animationMode == WorldMapCameraOperator.AnimationMode.None && pinchEvent.Velocity.magnitude >= 30f)
		{
			this._animationVelocity = pinchEvent.Velocity;
			this._animationMode = WorldMapCameraOperator.AnimationMode.Velocity;
		}
		this._pinching = false;
	}

	public void Init()
	{
	}

	public void ScrollTo(Transform t, bool animated)
	{
		this.ScrollTo(t.position, animated);
	}

	public void ScrollTo(GameObject go, bool animated)
	{
		Collider2D component = go.GetComponent<Collider2D>();
		Vector2 position;
		if (component != null)
		{
			position = component.bounds.center;
		}
		else
		{
			position = go.transform.position;
		}
		this.ScrollTo(position, animated);
	}

	public void ScrollTo(Vector2 position, bool animated)
	{
		if (this._pinching)
		{
			return;
		}
		Transform transform = this._cameraToOperate.transform;
		if (animated)
		{
			this._animationSource = transform.position;
			this._animationDestination = position;
			this._animationStartTime = Time.time;
			this._animationMode = WorldMapCameraOperator.AnimationMode.Destination;
		}
		else
		{
			this._animationMode = WorldMapCameraOperator.AnimationMode.None;
			Vector3 position2 = transform.position;
			position2.x = position.x;
			position2.y = position.y;
			transform.position = position2;
			this.RestrictCameraBounds();
		}
	}

	public Vector3 CameraWorldPosition
	{
		get
		{
			return this._cameraToOperate.transform.position;
		}
	}

	private void SoftRestrictCameraZoom(float deltaTime)
	{
		if (!this._pinching)
		{
			float num = this._cameraToOperate.orthographicSize;
			float num2 = this.CalculateZoomOffset(num);
			if (!Mathf.Approximately(num2, 0f))
			{
				float num3 = 0f;
				num = Mathf.SmoothDamp(num, num + num2, ref num3, this._zoomElasticity, float.PositiveInfinity, deltaTime);
				num += num3;
				this._cameraToOperate.orthographicSize = num;
			}
		}
	}

	private void RestrictCameraBounds()
	{
		Transform transform = this._cameraToOperate.transform;
		float num = this._cameraToOperate.orthographicSize * 2f;
		float num2 = num * this._cameraToOperate.aspect;
		Bounds bounds = this._cameraBounds.bounds;
		if (num2 > bounds.size.x)
		{
			num2 = bounds.size.x;
			num = num2 / this._cameraToOperate.aspect;
			this._cameraToOperate.orthographicSize = num * 0.5f;
		}
		if (num > bounds.size.y)
		{
			num = bounds.size.y;
			num2 = num * this._cameraToOperate.aspect;
			this._cameraToOperate.orthographicSize = num * 0.5f;
		}
		Vector3 position = transform.position;
		if (position.x - num2 * 0.5f < bounds.min.x)
		{
			position.x = bounds.min.x + num2 * 0.5f;
		}
		if (position.x + num2 * 0.5f > bounds.max.x)
		{
			position.x = bounds.max.x - num2 * 0.5f;
		}
		if (position.y - num * 0.5f < bounds.min.y)
		{
			position.y = bounds.min.y + num * 0.5f;
		}
		if (position.y + num * 0.5f > bounds.max.y)
		{
			position.y = bounds.max.y - num * 0.5f;
		}
		transform.position = position;
	}

	private float CalculateZoomOffset(float orthoSize)
	{
		float result = 0f;
		if (orthoSize < this._maxZoom)
		{
			result = this._maxZoom - orthoSize;
		}
		else if (orthoSize > this._minZoom)
		{
			result = this._minZoom - orthoSize;
		}
		return result;
	}

	private float DampenOffset(float overStretching, float zoomRange)
	{
		if (Mathf.Approximately(overStretching, 0f))
		{
			return 0f;
		}
		return (1f - 1f / (Mathf.Abs(overStretching) / (this._zoomStiffness * zoomRange) + 1f)) * zoomRange * Mathf.Sign(overStretching);
	}

	private const float VelocityReductionFactor = 0.95f;

	private const float VelocityStartMagnitudeThreshold = 30f;

	private const float VelocityEndMagnitudeThreshold = 5f;

	[SerializeField]
	private Camera _cameraToOperate;

	[SerializeField]
	private float _destinationAnimationDuration = 0.6f;

	[SerializeField]
	private AnimationCurve _destinationAnimationCurve = AnimationCurve.EaseInOut(0f, 0f, 1f, 1f);

	[SerializeField]
	private float _minZoom = 500f;

	[SerializeField]
	private float _maxZoom = 200f;

	[SerializeField]
	private float _zoomElasticity = 0.6f;

	[SerializeField]
	private float _zoomStiffness = 1.5f;

	[SerializeField]
	private BoxCollider2D _cameraBounds;

	private bool _pinching;

	private float _pinchingOrthoSize;

	private WorldMapCameraOperator.AnimationMode _animationMode;

	private Vector2 _animationVelocity;

	private Vector2 _animationSource;

	private Vector2 _animationDestination;

	private float _animationStartTime;

	private float _cameraZ;

	private enum AnimationMode
	{
		None,
		Velocity,
		Destination
	}
}