using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.Sprites;
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using UnityEngine.UI;
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[DisallowMultipleComponent]
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[AddComponentMenu("UI/Custom/Circle Image")]
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[RequireComponent(typeof(Image))]
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public class RoundedRectangleImage:BaseMeshEffect,ICanvasRaycastFilter {
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[SerializeField]
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float m_Radius = 10f;
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public float radius { get { return m_Radius; } }
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[SerializeField]
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[Range(16,128)]
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int m_Segements = 16;
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public int segements { get { return m_Segements; } }
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[SerializeField]
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Vector2 m_RealArea = Vector2.one * 100;
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public Vector2 realArea { get { return m_RealArea; } }
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private Image m_Image;
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public Image image { get { return m_Image ?? (m_Image = this.AddMissingComponent<Image>()); } }
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List<Vector3> vertexPosition = new List<Vector3>();
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public override void ModifyMesh(VertexHelper vh) {
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vh.Clear();
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vertexPosition.Clear();
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var tw = image.rectTransform.rect.width;
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var th = image.rectTransform.rect.height;
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var uv = image.overrideSprite != null ? DataUtility.GetOuterUV(image.overrideSprite) : Vector4.zero;
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var uvCenterX = (uv.x + uv.z) * 0.5f;
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var uvCenterY = (uv.y + uv.w) * 0.5f;
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var uvScaleX = (uv.z - uv.x) / tw;
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var uvScaleY = (uv.w - uv.y) / th;
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var interval = radius / (segements - 1);
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var center = new Vector2(realArea.x * 0.5f - radius,realArea.y * 0.5f - radius);
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for(int i = 0;i < segements;i++) {
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var position = new Vector2();
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var offsetX = interval * i;
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position.x = center.x + offsetX;
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position.y = center.y + Mathf.Sqrt(radius * radius - offsetX * offsetX);
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vertexPosition.Add(position);
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var vertex = new UIVertex();
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vertex.position = position;
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vertex.color = image.color;
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vertex.uv0 = new Vector2(position.x * uvScaleX + uvCenterX,position.y * uvScaleY + uvCenterY);
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vh.AddVert(vertex);
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}
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center = new Vector2(realArea.x * 0.5f - radius,-realArea.y * 0.5f + radius);
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for(int i = 0;i < segements;i++) {
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var position = new Vector2();
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var offsetX = interval * i;
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position.x = center.x + radius - offsetX;
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position.y = center.y - Mathf.Sqrt(radius * radius - (radius - offsetX) * (radius - offsetX));
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vertexPosition.Add(position);
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var vertex = new UIVertex();
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vertex.position = position;
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vertex.color = image.color;
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vertex.uv0 = new Vector2(position.x * uvScaleX + uvCenterX,position.y * uvScaleY + uvCenterY);
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vh.AddVert(vertex);
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}
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center = new Vector2(-realArea.x * 0.5f + radius,-realArea.y * 0.5f + radius);
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for(int i = 0;i < segements;i++) {
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var position = new Vector2();
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var offsetX = interval * i;
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position.x = center.x - offsetX;
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position.y = center.y - Mathf.Sqrt(radius * radius - offsetX * offsetX);
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vertexPosition.Add(position);
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var vertex = new UIVertex();
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vertex.position = position;
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vertex.color = image.color;
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vertex.uv0 = new Vector2(position.x * uvScaleX + uvCenterX,position.y * uvScaleY + uvCenterY);
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vh.AddVert(vertex);
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}
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center = new Vector2(-realArea.x * 0.5f + radius,realArea.y * 0.5f - radius);
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for(int i = 0;i < segements;i++) {
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var position = new Vector2();
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var offsetX = interval * i;
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position.x = center.x - radius + offsetX;
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position.y = center.y + Mathf.Sqrt(radius * radius - (radius - offsetX) * (radius - offsetX));
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vertexPosition.Add(position);
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var vertex = new UIVertex();
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vertex.position = position;
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vertex.color = image.color;
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vertex.uv0 = new Vector2(position.x * uvScaleX + uvCenterX,position.y * uvScaleY + uvCenterY);
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vh.AddVert(vertex);
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}
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var triangleCount = segements * 12 - 3;
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for(int i = 0,vIdx = 1;i < triangleCount - 3;i += 3,vIdx++) {
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vh.AddTriangle(vIdx,0,vIdx + 1);
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}
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}
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public virtual bool IsRaycastLocationValid(Vector2 screenPoint,Camera eventCamera) {
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var sprite = image.overrideSprite;
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if(sprite == null) {
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return true;
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}
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Vector2 local;
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RectTransformUtility.ScreenPointToLocalPointInRectangle(image.rectTransform,screenPoint,eventCamera,out local);
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return Contains(local,vertexPosition);
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}
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private bool Contains(Vector2 _p,List<Vector3> _vertexPositions) {
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var crossNumber = 0;
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crossNumber += UIUtility.RayCrossingCount(_p,_vertexPositions);
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return (crossNumber & 1) == 1;
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}
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}
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