Unity实现的汽车方向盘转动效果[完整案例]

说明：

这是一个UI界面中操作方向盘的演示，源于一个游戏项目，仅供学习参考，其中：
1、方向盘可复原
2、Android测试能够正常操作，没有出现轴心偏离现象（测试机型Galaxy S8-分辨率：2960x1440）

注意：

如果你要使用这个脚本，应将Rect Transfrom设置成如下属性，当然，某些属性不是必须要这么设定，但至少这样做可以正常工作，作为一个案例，供参考！

1、Rect Transfrom相关属性设定

2、其画布下的SteerWheel是Image类型的UI元素，图像设定为方向盘图片

3、Game

4、Inspector

5、演示结果

代码：

using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using UnityEngine.Events;
using System.Collections;/// <summary>
/// Steering wheel.
/// Defines the steerign wheel behaviour.
/// Original source:
/// http://forum.unity3d.com/threads/touchscreen-steering-wheel-rotation-example-mouse-supported.196741/
/// </summary>
public class SteeringWheel2D : MonoBehaviour
{[Tooltip("UI_Element通常它是一个Image类型的图像")][Header("方向盘UI本体")]public Graphic UI_Element;[Header("方向盘最大旋转角度")]public float maximumSteeringAngle = 520f;[Header("方向盘旋转复原速度")]public float wheelReleasedSpeed = 700f;[Header("方向盘当前旋转角度")]public float wheelAngle = 0f;float wheelPrevAngle = 0f;bool wheelBeingHeld = false;RectTransform rectT;[Tooltip("centerPoint是方向盘旋转的中心，其中你应将设定UI_Element的Img图片")][Header("方向盘旋转中心点")]public Vector2 centerPoint;/// <summary>/// Gets the clamped value./// Returns a value in range [-1,1] similar to GetAxis("Horizontal")/// 返回旋转进度比/// </summary>/// <returns>The clamped value.</returns>public float GetClampedValue(){return wheelAngle / maximumSteeringAngle;}/// <summary>/// Gets the angle./// returns the wheel angle itself without clamp operation/// 获取实际旋转角度（-520°~520°）/// </summary>/// <returns>The angle.</returns>public float GetAngle(){return wheelAngle;}/// <summary>/// Use this for initialization./// </summary>void Start(){rectT = UI_Element.rectTransform;InitEventsSystem();UpdateRect();}/// <summary>/// Initializes the events system to catch/// the user movements.i.e. MouseDown/MouseDrag/MouseUp./// </summary>void InitEventsSystem(){EventTrigger events = UI_Element.gameObject.GetComponent<EventTrigger>();if (events == null)events = UI_Element.gameObject.AddComponent<EventTrigger>();if (events.triggers == null)events.triggers = new System.Collections.Generic.List<EventTrigger.Entry>();EventTrigger.Entry entry = new EventTrigger.Entry();EventTrigger.TriggerEvent callback = new EventTrigger.TriggerEvent();UnityAction<BaseEventData> functionCall = new UnityAction<BaseEventData>(PressEvent);callback.AddListener(functionCall);entry.eventID = EventTriggerType.PointerDown;entry.callback = callback;events.triggers.Add(entry);entry = new EventTrigger.Entry();callback = new EventTrigger.TriggerEvent();functionCall = new UnityAction<BaseEventData>(DragEvent);callback.AddListener(functionCall);entry.eventID = EventTriggerType.Drag;entry.callback = callback;events.triggers.Add(entry);entry = new EventTrigger.Entry();callback = new EventTrigger.TriggerEvent();functionCall = new UnityAction<BaseEventData>(ReleaseEvent);callback.AddListener(functionCall);entry.eventID = EventTriggerType.PointerUp;entry.callback = callback;events.triggers.Add(entry);}/// <summary>/// Initializes the center point of seetring wheel transform/// rectangle./// 初始化方向盘变换矩形的旋转中心点。/// </summary>void UpdateRect(){Vector3[] corners = new Vector3[4];rectT.GetWorldCorners(corners);for (int i = 0; i < 4; i++){corners[i] = RectTransformUtility.WorldToScreenPoint(null, corners[i]);}Vector3 bottomLeft = corners[0];Vector3 topRight = corners[2];float width = topRight.x - bottomLeft.x;float height = topRight.y - bottomLeft.y;Rect _rect = new Rect(bottomLeft.x, topRight.y, width, height);centerPoint = new Vector2(_rect.x + _rect.width * 0.5f, _rect.y - _rect.height * 0.5f);}/// <summary>/// Update is called once per frame./// Update the wheel status. If the /// wheel is released, reset the rotation/// to initial (zero) rotation by /// wheelReleasedSpeed degrees per second/// </summary>void Update(){if (!wheelBeingHeld && !Mathf.Approximately(0f, wheelAngle)){float deltaAngle = wheelReleasedSpeed * Time.deltaTime;if (Mathf.Abs(deltaAngle) > Mathf.Abs(wheelAngle))wheelAngle = 0f;else if (wheelAngle > 0f)wheelAngle -= deltaAngle;elsewheelAngle += deltaAngle;}rectT.localEulerAngles = Vector3.back * wheelAngle;}/// <summary>/// Presses the event./// Executed when mouse/finger starts touching the steering wheel./// </summary>/// <param name="eventData">Event data.</param>public void PressEvent(BaseEventData eventData){Vector2 pointerPos = ((PointerEventData)eventData).position;wheelBeingHeld = true;wheelPrevAngle = Vector2.Angle(Vector2.up, pointerPos - centerPoint);}/// <summary>/// Drags the event./// Executed when mouse/finger is dragged over the steering wheel./// Do nothing if the pointer is too close to the center of the wheel./// Make sure wheel angle never exceeds maximumSteeringAngle./// </summary>/// <param name="eventData">Event data.</param>public void DragEvent(BaseEventData eventData){Vector2 pointerPos = ((PointerEventData)eventData).position;float wheelNewAngle = Vector2.Angle(Vector2.up, pointerPos - centerPoint);if (Vector2.Distance(pointerPos, centerPoint) > 20f){if (pointerPos.x > centerPoint.x)wheelAngle += wheelNewAngle - wheelPrevAngle;elsewheelAngle -= wheelNewAngle - wheelPrevAngle;}wheelAngle = Mathf.Clamp(wheelAngle, -maximumSteeringAngle, maximumSteeringAngle);wheelPrevAngle = wheelNewAngle;}/// <summary>/// Executed when mouse/finger stops touching the steering wheel/// Performs one last DragEvent, just in case/// </summary>/// <param name="eventData">Event data.</param>public void ReleaseEvent(BaseEventData eventData){DragEvent(eventData);wheelBeingHeld = false;}
}

—END—

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Unity实现的汽车方向盘转动效果[完整案例]

说明：

注意：

代码：

Unity实现的汽车方向盘转动效果[完整案例]相关推荐

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