144 lines
4.5 KiB
C#
144 lines
4.5 KiB
C#
using System.Collections.Generic;
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using UnityEngine;
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using Object = UnityEngine.Object;
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//============================================================
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//支持中文，文件使用UTF-8编码
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//@author JiphuTzu
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//@create 20220910
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//@company Umawerse
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//
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//@description:
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//============================================================
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namespace Umawerse.FiniteStateMachines
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{
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public class PolygonDrawState : DrawingState
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{
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private Mesh _mesh;
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private LineRenderer _line;
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public PolygonDrawState(ToolsBootstrap root) : base(root, StateName.polygon, 3, 99)
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{
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}
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protected override void OnTap(Vector3 pos)
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{
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AddPoint(pos);
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}
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protected override void OnDoubleTap(Vector3 pos)
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{
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AddPoint(pos);
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}
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protected override void UpdatePreview(Vector3 pos)
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{
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var verts = new List<Vector3>();
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verts.AddRange(vertices);
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verts.Add(pos);
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Show(verts);
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}
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public override void Init()
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{
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base.Init();
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_mesh = new Mesh();
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target.AddComponent<MeshFilter>().mesh = _mesh;
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var renderer = target.AddComponent<MeshRenderer>();
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renderer.material = root.ployMaterial;
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renderer.material.color = Color.green;
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//
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var mr = new GameObject("LineRender");
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mr.transform.SetParent(target.transform);
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_line = mr.AddComponent<LineRenderer>();
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_line.sortingOrder = -1;
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_line.startWidth = 0.3f;
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_line.endWidth = 0.3f;
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_line.numCornerVertices = 3;
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_line.material = root.solidLineMaterial;
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_line.material.color = Color.green;
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}
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public override void Complete()
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{
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Show(vertices);
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var mc = target.AddComponent<MeshCollider>();
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//var label = Object.Instantiate(root.labelPrefab, target.transform);
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//label.Init($"面积:", false);
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//label.SetPosition(mc.bounds.center + Vector3.up);
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//label.SetAlignment();
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}
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public override void AddPoint(Vector3 position, bool showImmediately = true)
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{
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vertices.Add(position);
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if (showImmediately)
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{
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var h = vertices[0].y > position.y ? vertices[0].y : position.y;
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for (var i = 0; i < vertices.Count; i++)
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{
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var v = vertices[i];
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v.y = h;
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vertices[i] = v;
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if (i + 1 < target.transform.childCount)
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target.transform.GetChild(i + 1).position = v;
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}
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}
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var ployPoint = Object.Instantiate(root.ployPointPrefab, target.transform);
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ployPoint.transform.localPosition = vertices[vertices.Count - 1];
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var mr = ployPoint.GetComponent<MeshRenderer>();
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mr.material.SetColor(COLOR_ID, Color.green);
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mr.sortingOrder = 2;
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if (vertices.Count < 3 || !showImmediately) return;
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Show(vertices);
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}
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private void Show(List<Vector3> verts)
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{
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var triangles = new List<int>();
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for (var i = 2; i < verts.Count; i++)
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{
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triangles.Add(0);
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if (IsUp(verts[i] - verts[0], verts[i - 1] - verts[0]))
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{
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triangles.Add(i);
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triangles.Add(i - 1);
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}
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else
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{
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triangles.Add(i - 1);
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triangles.Add(i);
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}
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}
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_mesh.vertices = verts.ToArray();
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_mesh.triangles = triangles.ToArray();
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//
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var vs = new Vector3[verts.Count + 1];
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verts.CopyTo(vs);
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vs[vs.Length - 1] = vs[0];
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_line.positionCount = vs.Length;
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_line.SetPositions(vs);
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_line.material.SetFloat("_Cnt", GetLength(vs) / 3);
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}
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private bool IsUp(Vector3 a, Vector3 b)
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{
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var nor = Vector3.Cross(a, b);
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var angle = Vector3.Dot(nor, Vector3.up);
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return angle > 0;
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}
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private float GetLength(Vector3[] verts)
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{
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var length = 0f;
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for (var i = 1; i < verts.Length; i++)
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{
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length += Vector3.Distance(verts[i], verts[i - 1]);
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}
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return length;
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}
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}
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}
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