unity5 JoyJoystick分析

参考雨松momo 的《Unity3D研究院之IOS自定义游戏摇杆与飞机平滑的移动（十一）》一文

地址：http://www.xuanyusong.com/archives/526

文中的JoyJoystick脚本是Unity自带的比较旧的脚本，我这儿是针对Unity新的脚本进行分析；

Joystick.cs是官方提供的脚本，具体代码如下:

using System;using UnityEngine;using UnityEngine.EventSystems;namespace UnityStandardAssets.CrossPlatformInput{public class Joystick : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IDragHandler{public enum AxisOption{// Options for which axes to useBoth, // Use bothOnlyHorizontal, // Only horizontalOnlyVertical // Only vertical}public int MovementRange = 100;public AxisOption axesToUse = AxisOption.Both; // The options for the axes that the still will usepublic string horizontalAxisName = "Horizontal"; // The name given to the horizontal axis for the cross platform inputpublic string verticalAxisName = "Vertical"; // The name given to the vertical axis for the cross platform inputVector3 m_StartPos;bool m_UseX; // Toggle for using the x axisbool m_UseY; // Toggle for using the Y axisCrossPlatformInputManager.VirtualAxis m_HorizontalVirtualAxis; // Reference to the joystick in the cross platform inputCrossPlatformInputManager.VirtualAxis m_VerticalVirtualAxis; // Reference to the joystick in the cross platform inputvoid OnEnable(){CreateVirtualAxes();}        void Start()        {            m_StartPos = transform.position;        }void UpdateVirtualAxes(Vector3 value){var delta = m_StartPos - value;          delta.y = -delta.y;delta /= MovementRange;            //圆形                       if (Vector3.SqrMagnitude(delta)>1)            {                delta = delta.normalized;            }           // Debug.Log(Vector3.SqrMagnitude(delta));            if (m_UseX){m_HorizontalVirtualAxis.Update(-delta.x);}if (m_UseY){m_VerticalVirtualAxis.Update(delta.y);}}void CreateVirtualAxes(){// set axes to usem_UseX = (axesToUse == AxisOption.Both || axesToUse == AxisOption.OnlyHorizontal);m_UseY = (axesToUse == AxisOption.Both || axesToUse == AxisOption.OnlyVertical);// create new axes based on axes to useif (m_UseX){m_HorizontalVirtualAxis = new CrossPlatformInputManager.VirtualAxis(horizontalAxisName);CrossPlatformInputManager.RegisterVirtualAxis(m_HorizontalVirtualAxis);}if (m_UseY){m_VerticalVirtualAxis = new CrossPlatformInputManager.VirtualAxis(verticalAxisName);CrossPlatformInputManager.RegisterVirtualAxis(m_VerticalVirtualAxis);}}public void OnDrag(PointerEventData data){Vector3 newPos = Vector3.zero;if (m_UseX){int delta = (int)(data.position.x - m_StartPos.x);delta = Mathf.Clamp(delta, - MovementRange, MovementRange);newPos.x = delta;}if (m_UseY){int delta = (int)(data.position.y - m_StartPos.y);delta = Mathf.Clamp(delta, -MovementRange, MovementRange);newPos.y = delta;}transform.position = new Vector3(m_StartPos.x + newPos.x, m_StartPos.y + newPos.y, m_StartPos.z + newPos.z);UpdateVirtualAxes(transform.position);}public void OnPointerUp(PointerEventData data){transform.position = m_StartPos;UpdateVirtualAxes(m_StartPos);}public void OnPointerDown(PointerEventData data) { }void OnDisable(){// remove the joysticks from the cross platform inputif (m_UseX){m_HorizontalVirtualAxis.Remove();}if (m_UseY){m_VerticalVirtualAxis.Remove();}}}}

我这里是对原文Main.js 的改编，我这里用的语言是C#：

using UnityEngine;using System.Collections;using UnityStandardAssets.CrossPlatformInput;using UnityEngine.UI;public class Main : MonoBehaviour {    public Joystick moveJoystick;    public Image plan;//飞机贴图    //飞机在屏幕中的坐标    float x = 0.0f;    float y = 0.0f;    //避免飞机飞出屏幕，分别是X，Y最大坐标 ，最小坐标是0，0    float cross_x = 0;    float cross_y = 0;    float planSpeed = 20.0f;//飞机移动速度    // Use this for initialization    void Start()    {        x = 200.0f;        y = 200.0f;        cross_x = Screen.width - plan.GetComponent<RectTransform>().rect.width * 0.5f;        cross_y = Screen.height - plan.GetComponent<RectTransform>().rect.height*0.5f;         }    // Update is called once per frame    void Update()    {        //得到游戏摇杆的反馈信息  得到是-1到1之间          //官方CrossPlatformInput核心是提出了PC和手机输入的兼容方案        float touchKey_x = CrossPlatformInputManager.GetAxis(moveJoystick.horizontalAxisName);        float touchKey_y = CrossPlatformInputManager.GetAxis(moveJoystick.verticalAxisName);        //摇杆向左        if (touchKey_x<0)        {            x -= planSpeed;        }        else if (touchKey_x>0)        {            x += planSpeed;        }        //摇杆向xia        if (touchKey_y <0)        {            y -= planSpeed;        }        else if (touchKey_y >0)        {            y+= planSpeed;        }        //防止飞机飞出屏幕，出界检测        if (x < 50)        {            x = 50;        }        else if (x > cross_x)        {            x = cross_x;        }        if (y < 150)        {            y = 150;        }        else if (y > cross_y)        {            y = cross_y;        }        plan.GetComponent<RectTransform>().position= new Vector3(x,y,0);    }}

这里需要注意的几点是：

引用需要增加

using UnityStandardAssets.CrossPlatformInput;
using UnityEngine.UI;

另外就是获取游戏摇杆的反馈信息这儿

 float touchKey_x = CrossPlatformInputManager.GetAxis(moveJoystick.horizontalAxisName);        float touchKey_y = CrossPlatformInputManager.GetAxis(moveJoystick.verticalAxisName);