using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.UI;
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using UnityEngine.Sprites;
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[AddComponentMenu("UI/Custom/SquareHollow Image")]
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[DisallowMultipleComponent]
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[RequireComponent(typeof(Image))]
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public class SquareHollowImage : BaseMeshEffect, ICanvasRaycastFilter
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{
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[SerializeField]
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Vector2 m_Center;
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public Vector2 center {
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get { return m_Center; }
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set {
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m_Center = value;
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base.graphic.SetVerticesDirty();
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}
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}
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[SerializeField]
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Vector2 m_Cell;
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public Vector2 cell {
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get {
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return m_Cell;
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}
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set {
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m_Cell = value;
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base.graphic.SetVerticesDirty();
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}
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}
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public RectTransform rectTransform { get { return this.transform as RectTransform; } }
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private List<Vector3> innerVertices = new List<Vector3>();
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private List<Vector3> outterVertices = new List<Vector3>();
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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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public override void ModifyMesh(VertexHelper vh)
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{
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vh.Clear();
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innerVertices.Clear();
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outterVertices.Clear();
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var width = image.rectTransform.rect.width;
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var height = image.rectTransform.rect.height;
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var outerArea = new Vector2(0.5f * width, 0.5f * height);
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var leftBottom = new Vector2(outerArea.x * -1f, outerArea.y * -1f);
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var innerArea = new Vector2(Mathf.Clamp(cell.x, 0, width), Mathf.Clamp(cell.y, 0, height));
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var innerCenter = new Vector2(Mathf.Clamp(center.x, (innerArea.x - width) * 0.5f, (width - innerArea.x) * 0.5f), Mathf.Clamp(center.y, (innerArea.y - height) * 0.5f, (height - innerArea.y) * 0.5f));
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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) / width;
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var uvScaleY = (uv.w - uv.y) / height;
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var positions = new List<Vector3>();
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var position = Vector3.zero;
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position = new Vector3(innerCenter.x + innerArea.x * -0.5f, innerCenter.y + innerArea.y * -0.5f);
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positions.Add(position);
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innerVertices.Add(position);
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position = new Vector3(outerArea.x * -1f, outerArea.y * -1f);
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positions.Add(position);
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outterVertices.Add(position);
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position = new Vector3(innerCenter.x + innerArea.x * 0.5f, innerCenter.y + innerArea.y * -0.5f);
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positions.Add(position);
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innerVertices.Add(position);
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position = new Vector3(outerArea.x * 1f, outerArea.y * -1f);
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positions.Add(position);
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outterVertices.Add(position);
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position = new Vector3(innerCenter.x + innerArea.x * 0.5f, innerCenter.y + innerArea.y * 0.5f);
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positions.Add(position);
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innerVertices.Add(position);
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position = new Vector3(outerArea.x * 1f, outerArea.y * 1f);
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positions.Add(position);
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outterVertices.Add(position);
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position = new Vector3(innerCenter.x + innerArea.x * -0.5f, innerCenter.y + innerArea.y * 0.5f);
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positions.Add(position);
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innerVertices.Add(position);
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position = new Vector3(outerArea.x * -1f, outerArea.y * 1f);
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positions.Add(position);
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outterVertices.Add(position);
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for (int i = 0; i < positions.Count; i++)
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{
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position = positions[i];
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var uv0 = new Vector2(position.x * uvScaleX + uvCenterX, position.y * uvScaleY + uvCenterY);
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var uiVertex = UIUtility.PackageUIVertex(position, uv0, image.color);
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vh.AddVert(uiVertex);
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}
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var triangleCount = 8 * 3;
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for (int i = 0, vIdx = 0; i < triangleCount - 6; i += 6, vIdx += 2)
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{
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vh.AddTriangle(vIdx + 1, vIdx, vIdx + 3);
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vh.AddTriangle(vIdx, vIdx + 2, vIdx + 3);
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}
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vh.AddTriangle(8 - 1, 8 - 2, 1);
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vh.AddTriangle(8 - 2, 0, 1);
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}
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public virtual bool IsRaycastLocationValid(Vector2 screenPoint, Camera eventCamera)
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{
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var sprite = image.overrideSprite;
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if (sprite == null)
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{
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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, outterVertices, innerVertices);
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}
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private bool Contains(Vector2 p, List<Vector3> outterVertices, List<Vector3> innerVertices)
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{
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var crossNumber = 0;
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crossNumber += UIUtility.RayCrossingCount(p, innerVertices);
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crossNumber += UIUtility.RayCrossingCount(p, outterVertices);
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return (crossNumber & 1) == 1;
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}
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}
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