using System.Collections;

using System.Collections.Generic;

using UnityEngine;

using UnityEngine.UI;

public class MyImage : MonoBehaviour

{

    //MeshRenderer render;

    //MeshFilter filter;

    //VertexHelper vertex;

    //Mesh mesh;

    //Color32 color;

    //public Texture texture;

    // Start is called before the first frame update

    //用来渲染Mesh

    MeshRenderer render;

    //用来添加网格

    MeshFilter filter;

    //顶点帮助器

    VertexHelper vertex;

    Color color;

    //贴图

    public Texture texture;

    //网格

    Mesh mesh;

    int traingleCount = 20;

    int radius = 5;

    void Start()

    {

        render = GetComponent<MeshRenderer>();

        filter = GetComponent<MeshFilter>();

        mesh = new Mesh();

        vertex = new VertexHelper();

        float perAngle = 2 * Mathf.PI / traingleCount;

        vertex.Clear();

        vertex.AddVert(new Vector3(0,0,0),Color.white,new Vector2(0,0));

        float x = 0, y = 0;

        for (int i = 0; i < traingleCount; i++)

        {

            x = Mathf.Sin(2*Mathf.PI-i*perAngle);

            y = Mathf.Cos(2*Mathf.PI-i*perAngle);

            color = Color.Lerp(Color.blue,Color.red,(float)i/(traingleCount-1));

            vertex.AddVert(new Vector3(x*radius, y*radius, 0),color,new Vector2(x,y));

        }

        for (int i = 1; i < traingleCount; i++)

        {

            vertex.AddTriangle(0,i,i+1);

        }

        vertex.AddTriangle(0,traingleCount,1);

        vertex.FillMesh(mesh);

        filter.mesh = mesh;

        render.material.mainTexture = texture;

        //render = GetComponent<MeshRenderer>();

        //filter = GetComponent<MeshFilter>();

        //mesh = new Mesh();

        //vertex = new VertexHelper();

        //vertex.Clear();

        //vertex.AddVert(new Vector3(0,0,0),Color.red,new Vector2(0,0));

        //vertex.AddVert(new Vector3(0,1,0),Color.black,new Vector2(0,1));

        //vertex.AddVert(new Vector3(1,1,0),Color.green,new Vector2(1,1));

        //vertex.AddVert(new Vector3(1,0,0),Color.yellow,new Vector2(1,0));

        //vertex.AddTriangle(0,1,2);

        //vertex.AddTriangle(0,2,3);

        //vertex.FillMesh(mesh);

        //filter.mesh = mesh;

        //render.material.mainTexture = texture;

    }

    // Update is called once per frame

    void Update()

    {

    }

}