c# - 如何制作动态创建和销毁圆圈中的 2d 游戏对象的 slider

Question

我创建了一个编辑器工具，可以在一个圆圈中创建游戏对象，彼此之间的距离相等(代码如下)。它有一个创建按钮，因此在粉碎创建之前调整参数。我希望看到在场景 View 中动态进行的更改。如何使用 slider 调整以下参数:

1. 使用对象计数 slider 创建或销毁游戏对象，同时进行调整以使对象之间的角度保持相同

2. 通过改变半径 slider 动态调整游戏对象

3. 使用角度 slider 旋转圆圈上的所有对象(如旋转轮子)

CircleSpawn

public class CircleSpawn : MonoBehaviour {
    public float radius;
    public int numOfItems;
    public GameObject clonedObject;
    public List<GameObject> spawnedObjects;
}

CircleSpawnEditor

[CustomEditor(typeof(CircleSpawn))]
public class CircleSpawnEditor : Editor
{
    public override void OnInspectorGUI()
    {
        var tar = (CircleSpawn)target;

        //set its values
        tar.radius = EditorGUILayout.FloatField("Radius:", tar.radius);
        tar.numOfItems = EditorGUILayout.IntField("Number of Items:", tar.numOfItems);
        tar.clonedObject = (GameObject)EditorGUILayout.ObjectField(tar.clonedObject,
                   typeof(GameObject), true);

        //Inspector button for creating the objects in the Editor
        if (GUILayout.Button("Create"))
        {
            //clean up old objects
            if (tar.spawnedObjects != null)
            {
                foreach (var ob in tar.spawnedObjects)
                {
                    DestroyImmediate(ob);
                }
            }
            tar.spawnedObjects = new List<GameObject>();

            float angleBetween = 360.0f / tar.numOfItems;
            float angle = 0;
            for (int i = 0; i <= tar.numOfItems; i++)
            {
                //for each object, find a rotation and position
                var rot = Quaternion.Euler(0, 0, angle);
                var localPos = rot * Vector3.right * tar.radius;
                tar.spawnedObjects.Add(Instantiate(tar.clonedObject,
                tar.transform.position + localPos, rot));
                angle += angleBetween;
            }
        }
    }
}

Answer 1

Create or destroy game objects using an object count slider, whiles adjusting to keep the objects the same angle apart

使用 IntSlider对于 numOfItems 和重新创建对象，当:

numOfItems != spawnedObjects.Count

Dynamically adjust the game objects by changing a radius slider

使用 Slider对于 radius，当它发生变化时，遍历 spawnedObjects 并将它们移动:

pos = rot * Vector3.right * tar.radius

Rotate all objects on the circle (like spinning a wheel) using an angle slider

使用 Slider对于 spin，当它发生变化时，迭代 spawnedObjects 并将它们旋转:

rot = Quaternion.Euler(0, 0, tar.spin + angle)

---

CircleSpawn:

public class CircleSpawn : MonoBehaviour
{
    public float radius, radiusLast, spin, spinLast;
    public int numOfItems;
    public GameObject clonedObject;
    public List<GameObject> spawnedObjects;
}

CircleSpawnEditor:

[CustomEditor(typeof(CircleSpawn))]
public class CircleSpawnEditor : Editor
{
    public override void OnInspectorGUI ()
    {
        var tar = (CircleSpawn)target;    
        EditorGUILayout.LabelField("Radius"); // Set as required
        tar.radius = EditorGUILayout.Slider(tar.radius, 0f, 100f);          
        EditorGUILayout.LabelField("Angle"); // Set as required
        tar.spin = EditorGUILayout.Slider(tar.spin, 0f, 360f);              
        EditorGUILayout.LabelField("Number of Items"); // Set as required
        tar.numOfItems = EditorGUILayout.IntSlider(tar.numOfItems, 0, 36);  
        EditorGUILayout.LabelField("Object");
        tar.clonedObject = (GameObject)EditorGUILayout.ObjectField(tar.clonedObject, 
        typeof(GameObject), true);

        float angle, angleBetween = 360.0f / tar.numOfItems;

        if (tar.spawnedObjects == null)
            tar.spawnedObjects = new List<GameObject>();

        // Solution #1    
        if (tar.spawnedObjects.Count != tar.numOfItems)
        {
            foreach (var ob in tar.spawnedObjects)
                DestroyImmediate(ob);

            tar.spawnedObjects.Clear();
            angle = 0f;

            for (int i = 0; i < tar.numOfItems; i++)
            {
                var rot = Quaternion.Euler(0f, 0f, tar.spin + angle);
                var localPos = rot * Vector3.right * tar.radius;    
                tar.spawnedObjects.Add(Instantiate(tar.clonedObject,
                tar.transform.position + localPos, rot));
                angle += angleBetween;
            }
        }

        // Solutions #2 & 3    
        if (!Mathf.Approximately(tar.spin, tar.spinLast) ||
            !Mathf.Approximately(tar.radius, tar.radiusLast))
        {
            tar.spinLast = tar.spin;
            tar.radiusLast = tar.radius;    
            angle = 0f;

            for (int i = 0; i < tar.numOfItems; i++)
            {
                var rot = Quaternion.Euler(0f, 0f, tar.spin + angle);
                var localPos = rot * Vector3.right * tar.radius;    
                tar.spawnedObjects[i].transform.position = 
                tar.transform.position + localPos;
                tar.spawnedObjects[i].transform.rotation = rot;
                angle += angleBetween;
            }
        }
    }
}