android - 将 Canvas 内的游戏对象移动到接触点

Question

我是 Unity 3D 的新手，正在按照 Udemy 教程学习该平台。我在类(class)中开发了一个游戏 GoHippoGo，其中河马的图像在屏幕上移动到触摸点。

虽然当我尝试使用 Canvas 和面板等...使游戏适合所有屏幕尺寸时，河马停止移动了!!触摸时它只会掉出屏幕(那太慢了)，而不是移动到触摸点。

我尝试在整个互联网上搜索，甚至是 unity 论坛，但找不到解决方案。我的错误可能很明显，但由于我是新手，请配合:P

谢谢

这是我的 Canvas 的截图:

这是我的 MoveHippo 脚本:

using UnityEngine;
using System.Collections;

public class MoveHippo : MonoBehaviour {

    private float lastTouchTime, currentTouchTime;

    public float velocityVal;
    public float torqueVal;
    public float thresholdTime;


    void Awake() {
        velocityVal = 8.0f;
        torqueVal = 200.0f;
        thresholdTime = 0.3f;
    }

    void Update () {

    #if UNITY_ANDROID
        moveHippoAndroid ();
    #endif

    #if UNITY_EDITOR
        moveHippo();
    #endif  
    }

    void moveHippo() { //For testing only in your COMPUTER
        Vector3 currentPos, touchedPos, distanceVec;
        if (Input.GetMouseButtonDown(0)) {
            startRotatingHippoAndStopIt();
        }

        else if (Input.GetMouseButtonUp(0)) {
            currentPos = Camera.main.WorldToScreenPoint (transform.position);
            touchedPos = Input.mousePosition;
            distanceVec = (touchedPos - currentPos).normalized;
            stopRotatingHippoAndMoveIt(distanceVec, velocityVal);
        }
    }

    void moveHippoAndroid() { 
        Vector3 currentPos, touchedPos, distanceVec;        
        for (int i = 0; i < Input.touches.Length; i++) {
            Touch touch = Input.GetTouch(i);
            currentPos = Camera.main.WorldToScreenPoint(transform.position);
            touchedPos = touch.position;
            distanceVec = (touchedPos - currentPos).normalized;
            if (Input.GetTouch(0).phase == TouchPhase.Began) {
                startRotatingHippoAndStopIt();
            } else if (Input.GetTouch(0).phase == TouchPhase.Ended){
                currentTouchTime = Time.time;
                if (currentTouchTime - lastTouchTime > thresholdTime) { //No Double Touch detected ...
                    lastTouchTime = Time.time;
                    stopRotatingHippoAndMoveIt(distanceVec, velocityVal);
                } else if (currentTouchTime - lastTouchTime < thresholdTime){ //Double Touch detected!
                    lastTouchTime = Time.time;
                    stopRotatingHippoAndMoveIt(distanceVec, velocityVal*2.0f);
                }
            }
        }
    }

    void startRotatingHippoAndStopIt() {
        // We rorate the hippo...
        GetComponent<Rigidbody2D>().fixedAngle = false;
        GetComponent<Rigidbody2D>().AddTorque(torqueVal);

        // ... and stop it
        GetComponent<Rigidbody2D>().velocity=Vector2.zero;
    }

    void stopRotatingHippoAndMoveIt(Vector3 distanceVec, float velocity) {
        // We stop rotating the hippo...
        Quaternion hippoQuatern = new Quaternion();
        hippoQuatern.eulerAngles = new Vector3(0,0,0);
        GetComponent<Rigidbody2D>().fixedAngle = true;
        GetComponent<Rigidbody2D>().transform.rotation = hippoQuatern;

        // ... and move it.
        GetComponent<Rigidbody2D>().velocity = distanceVec*velocity;
    }

}

Answer 1

尝试使用 (RectTransform)transform.position或 GetComponent<RectTransform>().position (或者简称为 transform.position，但我喜欢记住我正在处理一个 RectTransform 而不是一个标准的 Transform)而不是 Camera.main.WorldToScreenPoint(transform.position) :由于您的 Canvas 设置为 Screen Space - Overlay，RectTransform 组件的全局位置将返回 X、Y、Z 值像素坐标。

如果您的屏幕是 800x600 并且您的对象居中，GetComponent<RectTransform>().position将返回(400.0f、300.0f、0.0f)。