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(); } }


        /// 

        /// Image's texture comes from the UnityEngine.Image.
        /// 
        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();
            }
        }

        /// 

        /// 子类需要重写该方法来自定义Image形状
        /// 
        /// 
        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 (overrideSprite == null)
                    return 0;
                return overrideSprite.rect.size.y / pixelsPerUnit;
            }
        }

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

        public virtual int layoutPriority { get { return 0; } }
        #endregion

        #region >> ICanvasRaycastFilter
        public virtual bool IsRaycastLocationValid(Vector2 screenPoint, Camera eventCamera)
        {
            return true;
        }
        #endregion
    }
}

CircleImage.cs

using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Sprites;
using System.Collections.Generic;

namespace MYTOOL.UI
{
    [RequireComponent(typeof(CanvasRenderer))]
    public class CircleImage : BaseImage
    {
        protected override void Awake()
        {
            dirty = false;
            innerVertices = new List<Vector3>();
            outterVertices = new List<Vector3>();
        }

        void Update()
        {
            if (!fill && dirty)
            {
                dirty = false;
                thickness = Mathf.Clamp(thickness, 0, rectTransform.rect.width / 2);
            }
        }

        [Tooltip("是否填充圆形")]
        [SerializeField] private bool fill = true;
        [Tooltip("圆形或扇形填充比例")]
        [SerializeField, Range(0, 1)] private float fillPercent = 1f;
        [Tooltip("圆形")]
        [SerializeField, Range(3, 100)] private int segements = 30;
        [Tooltip("圆环宽度")]
        [SerializeField] private float thickness = 10;

        private bool dirty;
        private List<Vector3> innerVertices;
        private List<Vector3> outterVertices;

        protected override void OnPopulateMesh(VertexHelper vh)
        {
            vh.Clear();

            innerVertices.Clear();
            outterVertices.Clear();

            float degreeDelta = (float)(2 * Mathf.PI / segements);
            int curSegements = (int)(segements * fillPercent);

            float tw = rectTransform.rect.width;
            float th = rectTransform.rect.height;
            float outerRadius = rectTransform.pivot.x * tw;
            float innerRadius = rectTransform.pivot.x * tw - thickness;

            Vector4 uv = overrideSprite != null ? DataUtility.GetOuterUV(overrideSprite) : Vector4.zero;

            float uvCenterX = (uv.x + uv.z) * 0.5f;
            float uvCenterY = (uv.y + uv.w) * 0.5f;
            float uvScaleX = (uv.z - uv.x) / tw;
            float uvScaleY = (uv.w - uv.y) / th;

            float curDegree = 0;
            UIVertex uiVertex;
            int verticeCount;
            int triangleCount;
            Vector2 curVertice;

            if (fill) //圆形
            {
                curVertice = Vector2.zero;
                verticeCount = curSegements + 1;
                uiVertex = new UIVertex();
                uiVertex.color = color;
                uiVertex.position = curVertice;
                uiVertex.uv0 = new Vector2(curVertice.x * uvScaleX + uvCenterX, curVertice.y * uvScaleY + uvCenterY);
                vh.AddVert(uiVertex);

                for (int i = 1; i < verticeCount; i++)
                {
                    float cosA = Mathf.Cos(curDegree);
                    float sinA = Mathf.Sin(curDegree);
                    curVertice = new Vector2(cosA * outerRadius, sinA * outerRadius);
                    curDegree += degreeDelta;

                    uiVertex = new UIVertex();
                    uiVertex.color = color;
                    uiVertex.position = curVertice;
                    uiVertex.uv0 = new Vector2(curVertice.x * uvScaleX + uvCenterX, curVertice.y * uvScaleY + uvCenterY);
                    vh.AddVert(uiVertex);

                    outterVertices.Add(curVertice);
                }

                triangleCount = curSegements * 3;
                for (int i = 0, vIdx = 1; i < triangleCount - 3; i += 3, vIdx++)
                {
                    vh.AddTriangle(vIdx, 0, vIdx + 1);
                }
                if (fillPercent == 1)
                {
                    //首尾顶点相连
                    vh.AddTriangle(verticeCount - 1, 0, 1);
                }
            }
            else //圆环
            {
                verticeCount = curSegements * 2;
                for (int i = 0; i < verticeCount; i += 2)
                {
                    float cosA = Mathf.Cos(curDegree);
                    float sinA = Mathf.Sin(curDegree);
                    curDegree += degreeDelta;

                    curVertice = new Vector3(cosA * innerRadius, sinA * innerRadius);
                    uiVertex = new UIVertex();
                    uiVertex.color = color;
                    uiVertex.position = curVertice;
                    uiVertex.uv0 = new Vector2(curVertice.x * uvScaleX + uvCenterX, curVertice.y * uvScaleY + uvCenterY);
                    vh.AddVert(uiVertex);
                    innerVertices.Add(curVertice);

                    curVertice = new Vector3(cosA * outerRadius, sinA * outerRadius);
                    uiVertex = new UIVertex();
                    uiVertex.color = color;
                    uiVertex.position = curVertice;
                    uiVertex.uv0 = new Vector2(curVertice.x * uvScaleX + uvCenterX, curVertice.y * uvScaleY + uvCenterY);
                    vh.AddVert(uiVertex);
                    outterVertices.Add(curVertice);
                }

                triangleCount = curSegements * 3 * 2;
                for (int i = 0, vIdx = 0; i < triangleCount - 6; i += 6, vIdx += 2)
                {
                    vh.AddTriangle(vIdx + 1, vIdx, vIdx + 3);
                    vh.AddTriangle(vIdx, vIdx + 2, vIdx + 3);
                }
                if (fillPercent == 1)
                {
                    //首尾顶点相连
                    vh.AddTriangle(verticeCount - 1, verticeCount - 2, 1);
                    vh.AddTriangle(verticeCount - 2, 0, 1);
                }

                dirty = true;
            }
        }

        public override bool IsRaycastLocationValid(Vector2 screenPoint, Camera eventCamera)
        {
            Sprite sprite = overrideSprite;
            if (sprite == null)
                return true;

            Vector2 local;
            RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, screenPoint, eventCamera, out local);
            return Contains(local, outterVertices, innerVertices);
        }

        private bool Contains(Vector2 p, List<Vector3> outterVertices, List<Vector3> innerVertices)
        {
            var crossNumber = 0;
            RayCrossing(p, innerVertices, ref crossNumber);//检测内环
            RayCrossing(p, outterVertices, ref crossNumber);//检测外环
            return (crossNumber & 1) == 1;
        }

        /// 

        /// 使用RayCrossing算法判断点击点是否在封闭多边形里
        /// 
        /// 
        /// 
        /// 
        private void RayCrossing(Vector2 p, List<Vector3> vertices, ref int crossNumber)
        {
            for (int i = 0, count = vertices.Count; i < count; i++)
            {
                var v1 = vertices[i];
                var v2 = vertices[(i + 1) % count];

                //点击点水平线必须与两顶点线段相交
                if (((v1.y <= p.y) && (v2.y > p.y))
                    || ((v1.y > p.y) && (v2.y <= p.y)))
                {
                    //只考虑点击点右侧方向，点击点水平线与线段相交，且交点x > 点击点x，则crossNumber+1
                    if (p.x < v1.x + (p.y - v1.y) / (v2.y - v1.y) * (v2.x - v1.x))
                    {
                        crossNumber += 1;
                    }
                }
            }
        }
    }
}

CircleImageEditor.cs

using System;
using System.Reflection;
using UnityEditor;
using UnityEngine;

namespace MYTOOL.UI
{
    [CustomEditor(typeof(CircleImage))]
    public class CircleImageEditor : Editor
    {
        private SerializedProperty m_Script;
        private SerializedProperty m_Sprite;
        private SerializedProperty m_Color;
        private SerializedProperty m_RaycastTarget;

        private SerializedProperty fill;
        private SerializedProperty fillPercent;
        private SerializedProperty segements;
        private SerializedProperty thickness;

        public void OnEnable()
        {
            m_Script = serializedObject.FindProperty("m_Script");
            m_Sprite = serializedObject.FindProperty("m_Sprite");
            m_Color = serializedObject.FindProperty("m_Color");
            m_RaycastTarget = serializedObject.FindProperty("m_RaycastTarget");

            fill = serializedObject.FindProperty("fill");
            fillPercent = serializedObject.FindProperty("fillPercent");
            segements = serializedObject.FindProperty("segements");
            thickness = serializedObject.FindProperty("thickness");
        }

        public override void OnInspectorGUI()
        {
            serializedObject.Update();

            EditorGUI.BeginDisabledGroup(true);
            EditorGUILayout.PropertyField(m_Script);
            EditorGUI.EndDisabledGroup();

            EditorGUILayout.Space();
            EditorGUILayout.PropertyField(m_Sprite);
            EditorGUILayout.PropertyField(m_Color);
            EditorGUILayout.PropertyField(m_RaycastTarget);

            EditorGUILayout.Space();

            EditorGUILayout.PropertyField(fill);
            EditorGUILayout.PropertyField(fillPercent);
            EditorGUILayout.PropertyField(segements);

            if (!fill.boolValue)
            {
                EditorGUILayout.PropertyField(thickness);
            }

            serializedObject.ApplyModifiedProperties(); // 应用修改
        }

        [MenuItem("GameObject/UI/CircleImage", false, priority = 90)]
        static void CreateCircleImage(MenuCommand menuCommand)
        {
            GameObject go = new GameObject("CircleImage", typeof(RectTransform), typeof(CircleImage));
            Undo.RegisterCreatedObjectUndo(go, $"CreatCircleImage{Time.frameCount}");

            // 以下代码通过反射获取 UGUI 中新增 UI 组件的体验：会自动构建 UI 运行环境
            try
            {
                Type type = Type.GetType("UnityEditor.UI.MenuOptions,UnityEditor.UI.dll", true);
                var method = type.GetMethod("PlaceUIElementRoot", BindingFlags.Static | BindingFlags.NonPublic);
                method.Invoke(null, new object[] { go, menuCommand });
            }
            catch (Exception e)
            {
                Debug.LogWarning($"{nameof(CircleImageEditor)}: 挂载组件失败，可能是 API 变更!");
                throw e;
            }

            Selection.activeGameObject = go;
        }
    }
}