using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class SphereColliderGizmo : MonoBehaviour {
    void Start() {
        
    }
	// Update is called once per frame
    void OnRenderObject() {
        // 添加SphereCollider处理
        var sphereColliders = gameObject.GetComponents<SphereCollider>();
        if (sphereColliders != null) {
            CreateLineMaterial();
            lineMaterial.SetPass(0);
            GL.PushMatrix();
            GL.MultMatrix(transform.localToWorldMatrix);

            foreach (var col in sphereColliders) {
                float radius = col.radius;
                Vector3 scale = transform.lossyScale;
                // 计算最大缩放值
                float maxScale = Mathf.Max(scale.x, scale.y, scale.z);
                float scaledRadius = radius * maxScale;

                Vector3 center = col.center;

                // 绘制三个方向的圆环
                DrawCircle(center, Vector3.up, Vector3.forward, scaledRadius);
                DrawCircle(center, Vector3.forward, Vector3.up, scaledRadius);
                DrawCircle(center, Vector3.right, Vector3.up, scaledRadius);
            }
            GL.PopMatrix();
        }

        // 原来的BoxCollider代码保持不变...
        var colliders = gameObject.GetComponents<BoxCollider>();
        // ... 后续BoxCollider的绘制代码保持不变 ...
    }

// 新增辅助方法绘制圆形
    void DrawCircle(Vector3 center, Vector3 normal, Vector3 axis, float radius) {
        int segments = 32;
        float angle = 0f;

        GL.Begin(GL.LINE_STRIP);
        GL.Color(Color.red);

        for (int i = 0; i <= segments; i++) {
            Vector3 point = center;
            point += (axis * Mathf.Cos(angle) + Vector3.Cross(normal, axis) * Mathf.Sin(angle)) * radius;
            GL.Vertex(point);
            angle += Mathf.PI * 2f / segments;
        }
        GL.End();
    }
 
    static Material lineMaterial;
    static void CreateLineMaterial() {
        if (!lineMaterial) {
            // Unity has a built-in shader that is useful for drawing
            // simple colored things.
            Shader shader = Shader.Find("Hidden/Internal-Colored");
            lineMaterial = new Material(shader);
            lineMaterial.hideFlags = HideFlags.HideAndDontSave;
            // Turn on alpha blending
            lineMaterial.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha);
            lineMaterial.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
            // Turn backface culling off
            lineMaterial.SetInt("_Cull", (int)UnityEngine.Rendering.CullMode.Off);
            // Turn off depth writes
            lineMaterial.SetInt("_ZWrite", 0);
        }
    }
}