画圆（颜色渐变的光点图）

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首先，此处画的圆是由等距的圆点拼成的。项目所需，画了9圈，根据一个值改变颜色。

整体代码如下：

using System.Collections;using UnityEngine;public class LightSpots: MonoBehaviour {    public GameObject circleModel;//要排布的物体    public float changeAngle = 0;//旋转改变的角度    private int count;//旋转一周需要的预制物体个数    private float angle = 0;//当前角度    private float r;//半径    private Color colorRed;//红色    private Color colorYellow;//黄色    private Color colorBlue;//蓝色    private Color colorWhite;//浅蓝    private void Awake()    {        colorRed = Color.red;        colorYellow = Color.yellow;        colorBlue = Color.blue;        colorWhite = Color.white;    }    // Use this for initialization    private void Start()    {        InitSpot();        ChangeColor(0.08f);    }    /// <summary>    /// 初始化所有点    /// </summary>    private void InitSpot()    {        for (r = 0.1f; r < 0.51f; r += 0.05f)        {            float changeAngle1 = changeAngle / r;            count = (int)(360 / changeAngle1);            for (int i = 0; i < count; i++)            {                Vector3 center = circleModel.transform.position;                GameObject obj = (GameObject)Instantiate(circleModel);                obj.transform.parent = gameObject.transform;                obj.transform.localScale = new Vector3(1, 1, 1);                float hudu = (angle / 180) * Mathf.PI;                float xx = center.x + r * Mathf.Cos(hudu);                float yy = center.y + r * Mathf.Sin(hudu);                obj.transform.position = new Vector3(xx, yy, 0);                obj.tag = "Lap" +((int)(r*20-1)).ToString();                angle += changeAngle1;            }        }    }    /// <summary>    /// 更改颜色    /// </summary>    public void ChangeColor(float diameter)    {        float m = 62831853 * diameter * diameter;        float n = Mathf.Sqrt(1 + 1764 * diameter * diameter);        float o = m / n;                for (int i=36;i<=180;i+=18)        {            if (o / i > 2000)                ColorControl(i, colorRed);            else if (o / i > 1000)                ColorControl(i, Color.Lerp(colorRed, colorYellow, 0.33f));            else if (o / i > 600)                ColorControl(i, Color.Lerp(colorRed, colorYellow, 0.67f));            else if (o / i > 400)                ColorControl(i, colorYellow);            else if (o / i > 300)                ColorControl(i, Color.Lerp(colorYellow, colorBlue, 0.33f));            else if (o / i > 200)                ColorControl(i, Color.Lerp(colorYellow, colorBlue, 0.67f));            else if (o / i > 100)                ColorControl(i, colorBlue);            else if (o / i > 50)                ColorControl(i, Color.Lerp(colorBlue, colorWhite, 0.05f));            else if (o / i >= 0)                ColorControl(i, Color.Lerp(colorBlue, colorWhite, 0.1f));            print(o / i);        }            }    /// <summary>    /// 控制每一圈的颜色    /// </summary>    /// <param name="radius"></param>    /// <param name="color"></param>    private void ColorControl(int radius,Color color)    {        for (int j = 0; j < GameObject.FindGameObjectsWithTag("Lap" + (radius/18-1).ToString()).Length; j++)            GameObject.FindGameObjectsWithTag("Lap" + (radius / 18 - 1).ToString())[j].GetComponent<UISprite>().color = color;    }}

InitSpot函数初始化圆点，通过两个for循环，根据半径画出9个圆，个数以及半径可自行更改。

调用ChangeColor方法可改变颜色。

结果图如下（中间圆点忽略）：

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