选择移动游戏对象的困难

本文关键字：对象 移动 游戏 选择 | 更新日期: 2023-09-27 18:26:43

我正在开发一款带有触摸控制的手机游戏。我可以很容易地选择一个不移动的游戏对象，它会做出反应，但当它移动时，很难选择它，因为它有点小（例如下落，它都是基于物理的）。有没有办法增加游戏对象的触摸半径，这样可以更容易地按下它，或者有其他解决方案？

 private void Update() {
    //User input (touches) will select cubes
    if(Input.touchCount > 0) {
        Touch touch = Input.GetTouch(0);
    }
    Touch[] touches = Input.touches;
    foreach(var touchInput in touches) {
        RaycastHit2D hit = Physics2D.Raycast(Camera.main.ScreenToWorldPoint((Input.GetTouch(0).position)), Vector2.zero);
        if (hit.collider != null) {
            selectedCube = hit.collider.gameObject;
            selectedCube.GetComponent<SpriteRenderer>().color = Color32.Lerp(defaultColor, darkerColor, 1);
        }
    }
}

选择移动游戏对象的困难

与其增加对象的对撞机大小（您在评论中讨论过），不如用相反的方式来处理它？使用Physics2D.CircleCast:检查触摸周围的区域是否发生碰撞，而不仅仅是单个点

private void Update() {
    //User input (touches) will select cubes
    if(Input.touchCount > 0) {
        Touch touch = Input.GetTouch(0);
    }
    Touch[] touches = Input.touches;
    foreach(var touchInput in touches) {
        float radius = 1.0f; // Change as needed based on testing
        RaycastHit2D hit = Physics2D.CircleCast(Camera.main.ScreenToWorldPoint((Input.GetTouch(0).position)), radius, Vector2.zero);
        if (hit.collider != null) {
            selectedCube = hit.collider.gameObject;
            selectedCube.GetComponent<SpriteRenderer>().color = Color32.Lerp(defaultColor, darkerColor, 1);
        }
    }
}

请注意，如果你有大量可选择的对象相互对齐，这就不太好了。。。但话说回来，在这种情况下，增加对撞机的尺寸也无济于事。（我想说只是增加对象大小。否则无法提高用户的准确性。或者允许多选，并使用Physics2D.CircleCastAll）。

希望这能有所帮助！如果你有任何问题，请告诉我。

编辑：为了获得更好的准确性，由于Physics2D.CircleCast返回的"第一个"结果可以任意选择，因此您可以使用Physics2D.CircleCastAll获取触摸半径内的所有对象，并且只选择最接近原始触摸点的对象：

private void Update() {
    //User input (touches) will select cubes
    if(Input.touchCount > 0) {
        Touch touch = Input.GetTouch(0);
    }
    Touch[] touches = Input.touches;
    foreach(var touchInput in touches) {
        float radius = 1.0f; // Change as needed based on testing
        Vector2 worldTouchPoint = Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position);
        RaycastHit2D[] allHits = Physics2D.CircleCastAll(worldTouchPoint, radius, Vector2.zero);
        // Find closest collider that was hit
        float closestDist = Mathf.Infinity;
        GameObject closestObject = null;
        foreach (RaycastHit2D hit in allHits){
            // Record the object if it's the first one we check,
            // or is closer to the touch point than the previous
            if (closestObject == null ||
                Vector2.Distance(closestObject.transform.position, worldTouchPoint) < closestDist){
                closestObject = hit.collider.gameObject;
                closestDist = Vector2.Distance(closestObject.transform.position, worldTouchPoint);
            }
        }
        // Finally, select the object we chose based on the criteria
        if (closestObject != null) {
            selectedCube = closestObject;
            selectedCube.GetComponent<SpriteRenderer>().color = Color32.Lerp(defaultColor, darkerColor, 1);
        }
    }
}
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