unity circleimage组件

BaseImage.cs

using System;
using UnityEngine;
using UnityEngine.UI;

namespace MYTOOL.UI
{
   
    public class BaseImage : MaskableGraphic, ISerializationCallbackReceiver, ILayoutElement, ICanvasRaycastFilter
    {
   
        [SerializeField] private Sprite m_Sprite;
        public Sprite sprite {
    get {
    return m_Sprite; } set {
    if (Tools.UniUtils.SetClass(ref m_Sprite, value)) SetAllDirty(); } }

        [NonSerialized] private Sprite m_OverrideSprite;
        public Sprite overrideSprite {
    get {
    return m_OverrideSprite == null ? sprite : m_OverrideSprite; } set {
    if (Tools.UniUtils.SetClass(ref m_OverrideSprite, value)) SetAllDirty(); } }


        /// <summary>
        /// Image's texture comes from the UnityEngine.Image.
        /// </summary>
        public override Texture mainTexture
        {
   
            get
            {
   
                return overrideSprite == null ? s_WhiteTexture : overrideSprite.texture;
            }
        }

        public float pixelsPerUnit
        {
   
            get
            {
   
                float spritePixelsPerUnit = 100;
                if (sprite)
                    spritePixelsPerUnit = sprite.pixelsPerUnit;

                float referencePixelsPerUnit = 100;
                if (canvas)
                    referencePixelsPerUnit = canvas.referencePixelsPerUnit;

                return spritePixelsPerUnit / referencePixelsPerUnit;
            }
        }

        public override void SetNativeSize()
        {
   
            if (overrideSprite != null)
            {
   
                float w = overrideSprite.rect.width / pixelsPerUnit;
                float h = overrideSprite.rect.height / pixelsPerUnit;
                rectTransform.anchorMax = rectTransform.anchorMin;
                rectTransform.sizeDelta = new Vector2(w, h);
                SetAllDirty();
            }
        }

        /// <summary>
        /// 子类需要重写该方法来自定义Image形状
        /// </summary>
        /// <param name="vh"></param>
        protected override void OnPopulateMesh(VertexHelper vh)
        {
   
            base.OnPopulateMesh(vh);
        }

        #region >> ISerializationCallbackReceiver
        public void OnAfterDeserialize() {
    }

        public void OnBeforeSerialize() {
    }
        #endregion

        #region >> ILayoutElement
        public virtual void CalculateLayoutInputHorizontal() {
    }
        public virtual void CalculateLayoutInputVertical() {
    }

        public virtual float minWidth {
    get {
    return 0; } }

        public virtual float preferredWidth
        {
   
            get
            {
   
                if (overrideSprite == null)
                    return 0;
                return overrideSprite.rect.size.x / pixelsPerUnit;
            }
        }

        public virtual float flexibleWidth {
    get {
    return -1; } }

        public virtual float minHeight {
    get {
    return 0; } }

        public virtual float preferredHeight
        {
   
            get
            {
   
                if