unity自定义头像

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public class CustomHeadImage : Image {    [SerializeField]    private float showPercent = 1f;    [SerializeField]    private int segments = 100;    protected override void OnPopulateMesh(VertexHelper vh)    {         vh.Clear();                 float width = rectTransform.rect.width;        float height = rectTransform.rect.height;        Vector2 uv = GetUV(overrideSprite);        Vector2 convertRatio = GetConvetRatio(uv.x, uv.y, width, height);        Vector2 uvCenter = GetUvCenter(uv.x, uv.y);        Vector2 originPos = GetOriginPos(width, height);        UIVertex origin = new UIVertex();        //设置原点颜色渐变        byte c = (byte)(showPercent * 255);         origin.color = new Color32(c, c, c, 255);         origin.position = originPos;         origin.uv0 = new Vector2(Vector2.zero.x * convertRatio.x + uvCenter.x, Vector2.zero.y * convertRatio.y + uvCenter.y);         vh.AddVert(origin);            float radian = Mathf.PI * 2 / segments;        float curRadian = 0;        float radius = width * 0.5f;        int realSegment = (int)(showPercent * segments);        for (int i = 0; i < segments + 1; i++)        {            float x = Mathf.Cos(curRadian) * radius;            float y = Mathf.Sin(curRadian) * radius;             curRadian += radian;            Vector2 xy = new Vector2(x, y);            UIVertex uvTemp = new UIVertex();            if (i < realSegment)            {                 uvTemp.color = color;            }            else            {                if (realSegment == segments)                {                     uvTemp.color = color;                }                else                {                     uvTemp.color = new Color32(60, 60, 60, 255);                }            }             uvTemp.position = xy + originPos;             uvTemp.uv0 = new Vector2(xy.x * convertRatio.x + uvCenter.x, xy.y * convertRatio.y + uvCenter.y);             vh.AddVert(uvTemp);        }            int id = 1;        for (int i = 0; i < segments; i++)        {             vh.AddTriangle(id, 0, id + 1);             id++;        }        }    private Vector2 GetConvetRatio(float uvWidth, float uvHeight, float width, float height)    {            Vector2 convertRatio = new Vector2(uvWidth / width, uvHeight / height);        return convertRatio;    }        private Vector2 GetUvCenter(float uvWidth, float uvHeight)    {        Vector2 center = new Vector2(uvWidth * 0.5f, uvHeight * 0.5f);        return center;    }        private Vector2 GetOriginPos(float width, float height)    {        Vector2 originPos = new Vector2((0.5f - rectTransform.pivot.x) * width, ((0.5f - rectTransform.pivot.y) * height));        return originPos;    }    private Vector2 GetUV(Sprite sprite)    {        Vector4 temp = sprite != null ? DataUtility.GetOuterUV(sprite) : Vector4.zero;        float uvHeight = temp.w - temp.y;        float uvWidth = temp.z - temp.x;        Vector2 uv = new Vector2(uvWidth, uvHeight);        return uv;    } }