53 lines
1.9 KiB
C#
53 lines
1.9 KiB
C#
using UnityEngine;
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using System.Collections;
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public class touchScale : MonoBehaviour
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{
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private Touch oldTouch1; //上次触摸点1(手指1)
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private Touch oldTouch2; //上次触摸点2(手指2)
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public float minScale;
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public float maxScale;
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public float ratio;//放大的倍数
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void Update()
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{
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//没有触摸，就是触摸点为0
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if (Input.touchCount <= 1)
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{
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return;
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}
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//多点触摸, 放大缩小
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Touch newTouch1 = Input.GetTouch(0);
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Touch newTouch2 = Input.GetTouch(1);
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//第2点刚开始接触屏幕, 只记录，不做处理
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if (newTouch2.phase == TouchPhase.Began)
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{
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oldTouch2 = newTouch2;
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oldTouch1 = newTouch1;
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return;
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}
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//计算老的两点距离和新的两点间距离，变大要放大模型，变小要缩放模型
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float oldDistance = Vector2.Distance(oldTouch1.position, oldTouch2.position);
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float newDistance = Vector2.Distance(newTouch1.position, newTouch2.position);
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//两个距离之差，为正表示放大手势， 为负表示缩小手势
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float offset = newDistance - oldDistance;
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//放大因子， 一个像素按 0.01倍来算(100可调整)
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float scaleFactor = offset / ratio;
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Vector3 localScale = transform.localScale;
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Vector3 scale = new Vector3(localScale.x + scaleFactor,
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localScale.y + scaleFactor,
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localScale.z + scaleFactor);
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//对物体的缩放大小进行限制
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scale.x = Mathf.Clamp(scale.x, minScale, maxScale);
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scale.y = Mathf.Clamp(scale.y, minScale, maxScale);
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scale.z = Mathf.Clamp(scale.z, minScale, maxScale);
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//对物体的缩放大小进行限制
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//if (scale.x >= 0.05f && scale.y >= 0.05f && scale.z >= 0.05f)
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//{
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// transform.localScale = scale;
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//}
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transform.localScale = scale;//物体的缩放比
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//记住最新的触摸点，下次使用
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oldTouch1 = newTouch1;
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oldTouch2 = newTouch2;
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}
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} |