using System;
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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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/// <summary>
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/// 矩形遮罩镂空
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/// </summary>
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public class RectGuidance : MonoBehaviour
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{
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public static RectGuidance instance;
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/// <summary>
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/// 高亮显示目标
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/// </summary>
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public Image target;
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/// <summary>
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/// 区域范围缓存
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/// </summary>
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private Vector3[] corners = new Vector3[4];
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/// <summary>
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/// 镂空区域中心
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/// </summary>
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private Vector4 center;
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/// <summary>
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/// 最终的偏移x
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/// </summary>
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private float targetOffsetX = 0;
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/// <summary>
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/// 最终的偏移y
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/// </summary>
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private float targetOffsetY = 0;
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/// <summary>
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/// 遮罩材质
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/// </summary>
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private Material material;
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/// <summary>
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/// 当前的偏移x
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/// </summary>
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private float currentOffsetX = 0f;
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/// <summary>
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/// 当前的偏移y
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/// </summary>
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private float currentOffsetY = 0f;
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/// <summary>
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/// 高亮区域缩放的动画时间
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/// </summary>
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private float shrinkTime = 0.5f;
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/// <summary>
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/// 事件渗透组件
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/// </summary>
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private GuidanceEventPenetrate eventPenetrate;
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Canvas canvas;
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private void Awake()
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{
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instance = this;
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canvas = GameObject.Find("MainUI").GetComponent<Canvas>();
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eventPenetrate = GetComponent<GuidanceEventPenetrate>();
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material = GetComponent<Image>().material;
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}
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public void Init(Image target)
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{
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this.target = target;
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if (eventPenetrate != null)
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{
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eventPenetrate.SetTargetImage(target);
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}
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//获取高亮区域的四个顶点的世界坐标
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target.rectTransform.GetWorldCorners(corners);
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for (int i = 0; i < corners.Length; i++)
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{
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Debug.Log("corners i:" + i + " vec3:" + corners[i]);
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}
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//计算高亮显示区域在画布中的范围
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targetOffsetX = Vector2.Distance(WorldToCanvasPos(canvas, corners[0]), WorldToCanvasPos(canvas, corners[3])) / 2f;
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targetOffsetY = Vector2.Distance(WorldToCanvasPos(canvas, corners[0]), WorldToCanvasPos(canvas, corners[1])) / 2f;
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//计算高亮显示区域的中心
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float x = corners[0].x + ((corners[3].x - corners[0].x) / 2);
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float y = corners[0].y + ((corners[1].y - corners[0].y) / 2);
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Vector3 centerWorld = new Vector3(x, y, 0);
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Vector2 center = WorldToCanvasPos(canvas, centerWorld);
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//设置遮罩材质中的中心变量
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Vector4 centerMat = new Vector4(center.x, center.y, 0, 0);
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material = GetComponent<Image>().material;
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material.SetVector("_Center", centerMat);
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//计算当前高亮显示区域的半径
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RectTransform canRectTransform = canvas.transform as RectTransform;
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if (canRectTransform != null)
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{
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//获取画布区域的四个顶点
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canRectTransform.GetWorldCorners(corners);
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//计算偏移初始值
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for (int i = 0; i < corners.Length; i++)
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{
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if (i % 2 == 0)
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{
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currentOffsetX = Mathf.Max(Vector3.Distance(WorldToCanvasPos(canvas, corners[i]), center), currentOffsetX);
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}
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else
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{
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currentOffsetY = Mathf.Max(Vector3.Distance(WorldToCanvasPos(canvas, corners[i]), center), currentOffsetY);
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}
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}
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}
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//设置遮罩材质中当前偏移的变量
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material.SetFloat("_SliderX", currentOffsetX);
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material.SetFloat("_SliderY", currentOffsetY);
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}
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public void InitForCamera(Image target, float x, float y)
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{
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this.target = target;
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if (eventPenetrate != null)
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{
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eventPenetrate.SetTargetImage(target);
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}
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Vector2 center = target.GetComponent<RectTransform>().anchoredPosition;
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material.SetVector("_Center", center);
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material.SetFloat("_SliderX", x);
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material.SetFloat("_SliderY", y);
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}
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/// <summary>
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/// 收缩速度
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/// </summary>
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private float shrinkVelocityX = 0f;
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private float shrinkVelocityY = 0f;
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//private void Update()
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//{
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//从当前偏移量到目标偏移量差值显示收缩动画
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// float valueX = Mathf.SmoothDamp(currentOffsetX, targetOffsetX, ref shrinkVelocityX, shrinkTime);
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// float valueY = Mathf.SmoothDamp(currentOffsetY, targetOffsetY, ref shrinkVelocityY, shrinkTime);
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// if (!Mathf.Approximately(valueX, currentOffsetX))
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// {
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// currentOffsetX = valueX;
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// material.SetFloat("_SliderX", currentOffsetX);
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// }
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// if (!Mathf.Approximately(valueY, currentOffsetY))
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// {
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// currentOffsetY = valueY;
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// material.SetFloat("_SliderY", currentOffsetY);
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// }
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//}
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//立刻显示阴影区域
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public void ShowImmediately()
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{
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//return;
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float valueX = Mathf.SmoothDamp(currentOffsetX, targetOffsetX, ref shrinkVelocityX, 0);
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float valueY = Mathf.SmoothDamp(currentOffsetY, targetOffsetY, ref shrinkVelocityY, 0);
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if (!Mathf.Approximately(valueX, currentOffsetX))
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{
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currentOffsetX = valueX;
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material.SetFloat("_SliderX", targetOffsetX);
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}
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if (!Mathf.Approximately(valueY, currentOffsetY))
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{
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currentOffsetY = valueY;
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material.SetFloat("_SliderY", targetOffsetY);
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}
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}
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/// <summary>
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/// 世界坐标转换为画布坐标
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/// </summary>
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/// <param name="canvas">画布</param>
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/// <param name="world">世界坐标</param>
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/// <returns></returns>
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private Vector2 WorldToCanvasPos(Canvas canvas, Vector3 world)
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{
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Vector2 position;
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RectTransformUtility.ScreenPointToLocalPointInRectangle(canvas.transform as RectTransform, world, canvas.GetComponent<Camera>(), out position);
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return position;
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}
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}
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