unity移动端，位移扩大缩小

最新推荐文章于 2021-03-29 14:15:04 发布

原创最新推荐文章于 2021-03-29 14:15:04 发布 · 370 阅读

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本文介绍如何使用Unity实现多点触控操作，并通过两个触摸点来控制摄像机的缩放效果，适用于需要手势交互的游戏或应用。

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多点触碰

using UnityEngine;
using System.Collections;

public class TouchTest : MonoBehaviour 
{
    void Update () 
    {
        Touch myTouch = Input.GetTouch(0);

        Touch[] myTouches = Input.touches;
        for(int i = 0; i < Input.touchCount; i++)
        {
            //Do something with the touches
        }
    }
}

扩大缩小

using UnityEngine;

public class PinchZoom : MonoBehaviour
{
    public float perspectiveZoomSpeed = 0.5f;        // The rate of change of the field of view in perspective mode.
    public float orthoZoomSpeed = 0.5f;        // The rate of change of the orthographic size in orthographic mode.


    void Update()
    {
        // If there are two touches on the device...
        if (Input.touchCount == 2)
        {
            // Store both touches.
            Touch touchZero = Input.GetTouch(0);
            Touch touchOne = Input.GetTouch(1);

            // Find the position in the previous frame of each touch.
            Vector2 touchZeroPrevPos = touchZero.position - touchZero.deltaPosition;
            Vector2 touchOnePrevPos = touchOne.position - touchOne.deltaPosition;

            // Find the magnitude of the vector (the distance) between the touches in each frame.
            float prevTouchDeltaMag = (touchZeroPrevPos - touchOnePrevPos).magnitude;
            float touchDeltaMag = (touchZero.position - touchOne.position).magnitude;

            // Find the difference in the distances between each frame.
            float deltaMagnitudeDiff = prevTouchDeltaMag - touchDeltaMag;

            // If the camera is orthographic...
            if (camera.isOrthoGraphic)
            {
                // ... change the orthographic size based on the change in distance between the touches.
                camera.orthographicSize += deltaMagnitudeDiff * orthoZoomSpeed;

                // Make sure the orthographic size never drops below zero.
                camera.orthographicSize = Mathf.Max(camera.orthographicSize, 0.1f);
            }
            else
            {
                // Otherwise change the field of view based on the change in distance between the touches.
                camera.fieldOfView += deltaMagnitudeDiff * perspectiveZoomSpeed;

                // Clamp the field of view to make sure it's between 0 and 180.
                camera.fieldOfView = Mathf.Clamp(camera.fieldOfView, 0.1f, 179.9f);
            }
        }
    }
}