110 lines
3.5 KiB
C#
110 lines
3.5 KiB
C#
using UnityEngine;
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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 CircleDrawingState : DrawingState
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{
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private int _segments = 60;
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public CircleDrawingState(ToolsBootstrap root) : base(root, StateName.circle, 2, 2)
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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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}
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public override void Complete()
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{
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var filter = target.AddComponent<MeshFilter>();
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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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var radius = Vector3.Distance(vertices[0], vertices[1]);
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var mesh = CreateMesh(radius, _segments);
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filter.mesh = mesh;
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//
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var mc = target.AddComponent<MeshCollider>();
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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 (vertices.Count == 1)
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target.transform.position = position;
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if (!showImmediately) return;
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var circlePoint = Object.Instantiate(root.circlePointPrefab, target.transform);
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circlePoint.transform.position = position;
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if (vertices.Count == 2)
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{
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//var radius = Vector3.Distance(vertices[0], vertices[1]);
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//_currentMeshFilter.mesh = CreateMesh(radius, _segments);
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Complete();
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}
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}
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private Mesh CreateMesh(float radius, int segments)
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{
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//vertices:
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var verticesCount = segments + 1;
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var vertices = new Vector3[verticesCount];
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var uvs = new Vector2[verticesCount];
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vertices[0] = Vector3.zero;
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var radian = Mathf.PI * 2;
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var delta = radian / segments;
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for (var i = 1; i < verticesCount; i++)
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{
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var x = Mathf.Cos(radian);
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var y = Mathf.Sin(radian);
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vertices[i] = new Vector3(radius * x, 0, radius * y);
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uvs[i] = new Vector2(x / 2 + 0.5f, y / 2 + 0.5f);
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radian -= delta;
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}
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//triangles
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var triangleCount = segments * 3;
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var triangles = new int[triangleCount];
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for (int i = 0, vi = 1; i <= triangleCount - 1; i += 3, vi++) //因为该案例分割了60个三角形，故最后一个索引顺序应该是：0 60 1；所以需要单独处理
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{
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triangles[i] = 0;
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triangles[i + 1] = vi;
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triangles[i + 2] = vi + 1;
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}
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triangles[triangleCount - 3] = 0;
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triangles[triangleCount - 2] = verticesCount - 1;
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triangles[triangleCount - 1] = 1; //为了完成闭环，将最后一个三角形单独拎出来
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//负载属性与mesh
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var mesh = new Mesh
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{
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name = "Circle",
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vertices = vertices,
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triangles = triangles,
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uv = uvs
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};
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return mesh;
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}
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}
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} |