Question

我正在制作一个统一的2d游戏，其中我想要一辆汽车在弯曲的道路上成为一个可拖动的物体。我已将以下脚本添加到仅适用于前向拖动的汽车中。 如何检测用户是否在mouseDrag事件中向前或向后拖动？我是团结的新手，我更喜欢只使用C＃而不是js。

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(BoxCollider2D))]

public class TouchInput : MonoBehaviour {
private Vector3 screenPoint;
private Vector3 offset;
public float speed = 20.0f;
Rigidbody2D rb;

void Start(){
rb = gameObject.GetComponent<Rigidbody2D>();
}

void OnMouseDown(){

}

void OnMouseDrag(){
Vector3 cursorPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);
Vector3 cursorPosition = Camera.main.ScreenToWorldPoint(cursorPoint) + offset;
rb.velocity = new Vector3(150 * Time.deltaTime, 0, 0);
}

void OnMouseUp()
{
rb.velocity = new Vector3(0, 0, 0);
}
}

Answer 1

请尝试此操作（方向算法为here）：

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(BoxCollider2D))]

public class TouchInput : MonoBehaviour {
private Vector3 screenPoint;
private Vector3 initialPosition;
private Vector3 offset;
public float speed = 20.0f;

Rigidbody2D rb;

void Start(){
    rb = gameObject.GetComponent<Rigidbody2D>();
}

void OnMouseDown(){
    Vector3 cursorPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y,     screenPoint.z);
    Vector3 initialPosition = Camera.main.ScreenToWorldPoint(cursorPoint) + offset;
}

void OnMouseDrag(){
   Vector3 cursorPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y,     screenPoint.z);
   Vector3 cursorPosition = Camera.main.ScreenToWorldPoint(cursorPoint) + offset;
   Vector3 heading = cursorPosition - initialPosition;
   Vector3 direction = heading / heading.magnitude;     // heading magnitude = distance 
   rb.velocity = new Vector3(150 * Time.deltaTime, 0, 0); 
   //Do what you want.
   //if you want to drag object on only swipe gesture comment below. Otherwise:
   initialPosition = cursorPosition;
}

void OnMouseUp()
{
   rb.velocity = new Vector3(0, 0, 0);
}
}

Answer 2

我写了this简单的教程，基本上是7行代码，就像一个魅力。简单易用。你只需要在Unity事件系统中使用te build来编写冗长且无用的代码。 无需使用更新或固定更新。

获取鼠标拖动方向unity3d C＃

2 个答案: