unity实现双指触摸实现鼠标滚轮滚动效果,请给出示例代码
时间: 2023-06-02 15:04:45 浏览: 214
以下是Unity中实现双指触摸实现鼠标滚轮滚动效果的示例代码:
```
using UnityEngine;
using System.Collections;
public class TouchMouseWheel : MonoBehaviour {
public float sensitivity = 10.0f;
private float scrollVelocity = 0.0f;
// Update is called once per frame
void Update () {
if (Input.touchCount == 2) {
Touch touchZero = Input.GetTouch(0);
Touch touchOne = Input.GetTouch(1);
Vector2 touchZeroPrevPos = touchZero.position - touchZero.deltaPosition;
Vector2 touchOnePrevPos = touchOne.position - touchOne.deltaPosition;
float prevTouchDeltaMag = (touchZeroPrevPos - touchOnePrevPos).magnitude;
float touchDeltaMag = (touchZero.position - touchOne.position).magnitude;
float deltaMagnitudeDiff = prevTouchDeltaMag - touchDeltaMag;
scrollVelocity += deltaMagnitudeDiff * sensitivity * Time.deltaTime;
MouseScroll(scrollVelocity);
}
// Decrease velocity over time
scrollVelocity = Mathf.Lerp(scrollVelocity, 0, Time.deltaTime * sensitivity);
}
// Simulate mouse scroll wheel
void MouseScroll(float delta) {
#if UNITY_EDITOR || UNITY_STANDALONE || UNITY_WEBGL
float scrollWheelAmount = delta * 0.1f;
// scroll mousewheel to replicate zoom effect
if (scrollWheelAmount > 0) {
// scroll up
Event e = new Event();
e.delta = new Vector2(0, 1 * scrollWheelAmount);
e.type = EventType.ScrollWheel;
e.mousePosition = Input.mousePosition;
e.control = false;
e.shift = false;
e.alt = false;
e.command = false;
if (Input.GetAxis("Mouse ScrollWheel") == 0) {
Event.current = e;
}
else {
// Hack: if mouse is already scrolling, add delta to the existing scroll value
e.delta = new Vector2(0, Input.GetAxis("Mouse ScrollWheel") + (1 * scrollWheelAmount));
Event.current = e;
}
SendMessage("OnScrollWheel", SendMessageOptions.DontRequireReceiver);
}
else if (scrollWheelAmount < 0) {
// scroll down
Event e = new Event();
e.delta = new Vector2(0, -1 * Mathf.Abs(scrollWheelAmount));
e.type = EventType.ScrollWheel;
e.mousePosition = Input.mousePosition;
e.control = false;
e.shift = false;
e.alt = false;
e.command = false;
if (Input.GetAxis("Mouse ScrollWheel") == 0) {
Event.current = e;
}
else {
// Hack: if mouse is already scrolling, add delta to the existing scroll value
e.delta = new Vector2(0, Input.GetAxis("Mouse ScrollWheel") - (1 * Mathf.Abs(scrollWheelAmount)));
Event.current = e;
}
SendMessage("OnScrollWheel", SendMessageOptions.DontRequireReceiver);
}
#endif
}
}
```
注意:该示例代码仅适用于Unity编辑器、桌面浏览器和WebGL平台,其它平台需要加以修改。
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