實現：流暢的拖拽GameObject

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主要注意：MonoBehaviour下的默認接口:

void OnMouseDown()

void OnMouseUp()

void Updata

還有一點：計算射線交點時候，代碼里用的ray和plane， 而不是這個掛接的GameObject。如果使用ray和掛接的GameObject可能會出現：鼠標滑動過快，導致鼠標移除GameObject，不再計算位置。

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using System.Collections; using System.Collections.Generic; using UnityEngine;/// <summary> /// 單個Piece的控制器 /// </summary> public class PieceControl : MonoBehaviour {/// <summary>/// 正確的位置 成功后不再移動/// </summary>private Vector3 mFinishedPos = Vector3.zero;/// <summary>/// 初始隨機的錯誤位置/// </summary>private Vector3 mStartPos = Vector3.zero;private Camera mGameCamera = null;private GameObject mCameraObject = null;private PieceState mNowState = PieceState.None;private Vector3 mOffsetVec3 = Vector3.zero;/// <summary>/// 已經選中了這個對象/// </summary>private bool mIsClickObject = false;/// <summary>/// 鼠標是否按下/// </summary>private bool mIsMouseDown = false;private Vector3 oldInput = Vector3.zero;// Use this for initializationvoid Start(){mCameraObject = GameObject.FindGameObjectWithTag("MainCamera");mGameCamera = mCameraObject.GetComponent<Camera>();}void Update(){if (mIsMouseDown){DragingRefreshPos();}}// 按下鼠標按鍵時 void OnMouseDown(){this.mIsMouseDown = true;Debug.LogError("Down:"+this.name);GetBeginDownOffset();}// 松開鼠標按鍵時void OnMouseUp(){Debug.LogError("Up" + this.name);this.mIsMouseDown = false;}/// <summary>/// 獲取剛拖動object時鼠標交點和object中心的偏移/// </summary>private void GetBeginDownOffset(){Vector3 rejectPos = Vector3.zero;if (GetClickProjectPos(ref rejectPos, Input.mousePosition)){mOffsetVec3 = transform.position - rejectPos;mIsClickObject = true;}}/// <summary>/// 根據GameObject和mouse的相對位置/// 每幀刷新拖動的位置/// </summary>private void DragingRefreshPos(){if (mIsClickObject){Vector3 rejectPos = Vector3.zero;if (GetClickProjectPos(ref rejectPos, Input.mousePosition)){transform.position = mOffsetVec3 + rejectPos;}}}/// <summary>/// 獲取交點坐標/// 當鼠標射線和大plane相交/// </summary>/// <returns></returns>private bool GetClickProjectPos(ref Vector3 click3dPos, Vector3 inputPos){Ray ray = mGameCamera.ScreenPointToRay(inputPos);// Debug.LogError("GetClickProjectPos oldInput:" + oldInput + " inputpos:" + inputPos);oldInput = inputPos;Plane plane = new Plane(Vector3.forward, new Vector3(0.0f, this.transform.position.y, 0.0f));float rayDepth;if(plane.Raycast(ray,out rayDepth)){click3dPos = ray.origin + ray.direction * rayDepth;return true;}return false;}#region 碎片的狀態private enum PieceState{None = -1,Idle = 0,Draging = 2,Finished = 3,Restart = 4,Snapping = 5//吸附過程中 }#endregion}

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轉載于:https://www.cnblogs.com/sun-shadow/p/9206173.html

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