udpate 0.6.3.3
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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 XericLibrary.Runtime.MacroLibrary;
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namespace XericLibrary.Runtime.UIGraph
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{
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/// <summary>
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/// 曲线网格生成器
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/// 将贝塞尔曲线细分为线段带状三角片 + 生成箭头装饰
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///
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/// 核心算法：
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/// 1. 在 t∈[0,1] 上均匀采样 N+1 个点
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/// 2. 每个采样点计算位置、切线、宽度、颜色
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/// 3. 切线转 90° 得切法线，沿切法线位移 halfWidth 得左右边顶点
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/// 4. 顺序连接左右边顶点形成 ribbon 带状：
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/// 左[i]──右[i]──左[i+1]──右[i+1]──...
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/// 每个四边形拆两个三角形
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/// </summary>
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public static class CurveMeshGenerator
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{
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/// <summary>圆圈箭头多边形边数</summary>
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private const int CircleArrowSides = 8;
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/// <summary>计算切线时的 epsilon 采样偏移</summary>
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private const float TangentEpsilon = 0.001f;
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/// <summary>
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/// 生成单条曲线的网格数据
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/// </summary>
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public static void GenerateCurve(
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in CurveCacheEntry entry,
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List<Vector2> controlPointsPool,
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List<float> widthsPool,
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List<ArrowHeadData> arrowsPool,
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List<UIVertex> vertexList,
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List<int> indexList)
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{
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int segCount = entry.tessellationSegments;
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if (segCount < 1) segCount = 4;
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int sampleCount = segCount + 1; // N+1 个采样点
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int cpStart = entry.controlPointStartIndex;
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int cpCount = entry.controlPointCount;
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int wStart = entry.widthStartIndex;
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var ctrlPts = new Vector2[cpCount];
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var wPts = new float[cpCount];
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for (int i = 0; i < cpCount; i++)
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{
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ctrlPts[i] = controlPointsPool[cpStart + i];
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wPts[i] = widthsPool[wStart + i];
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}
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int baseVertex = vertexList.Count;
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UIVertex vert = new UIVertex
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{
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normal = Vector3.back,
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tangent = new Vector4(1f, 0f, 0f, -1f),
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uv1 = new Vector2(1f, 0f),
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};
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// 1. 采样 + 生成左右边顶点
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for (int s = 0; s < sampleCount; s++)
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{
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float t = (float)s / segCount;
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Vector2 pos = MacroCurve.BezierCurve(ctrlPts, t); // 曲线上点
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float width = MacroCurve.BezierCurve(wPts, t); // 当前宽度
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Vector2 tangent = ComputeTangent(ctrlPts, t); // 切线方向
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Vector2 normal = new Vector2(-tangent.y, tangent.x); // 切法线（左转90°）
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MacroCurve.BezierCurve1(entry.startColor, entry.endColor, t, out Color col);
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Color32 color = col;
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float halfW = width * 0.5f;
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float uv = (float)s / segCount;
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// 左边顶点
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vert.position = pos - normal * halfW;
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vert.color = color;
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vert.uv0 = new Vector2(0f, uv);
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vertexList.Add(vert);
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// 右边顶点
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vert.position = pos + normal * halfW;
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vert.color = color;
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vert.uv0 = new Vector2(1f, uv);
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vertexList.Add(vert);
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}
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// 2. 连接带状三角形
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// 左[i]=v[i*2], 右[i]=v[i*2+1]
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// 四边形 i→i+1: (左i, 右i, 左i+1) + (右i, 右i+1, 左i+1)
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for (int s = 0; s < segCount; s++)
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{
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int bv = baseVertex + s * 2;
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indexList.Add(bv + 0); // 左i
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indexList.Add(bv + 1); // 右i
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indexList.Add(bv + 2); // 左i+1
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indexList.Add(bv + 1); // 右i
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indexList.Add(bv + 3); // 右i+1
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indexList.Add(bv + 2); // 左i+1
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}
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// 3. 生成箭头
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if (entry.arrowCount > 0 && entry.arrowStartIndex >= 0)
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{
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for (int a = 0; a < entry.arrowCount; a++)
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{
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var arrow = arrowsPool[entry.arrowStartIndex + a];
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GenerateArrow(arrow, ctrlPts, vertexList, indexList);
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}
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}
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}
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/// <summary>
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/// 计算曲线上 t 处的切线方向（差分法）
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/// </summary>
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private static Vector2 ComputeTangent(Vector2[] ctrlPts, float t)
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{
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float t0 = Mathf.Max(0f, t - TangentEpsilon);
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float t1 = Mathf.Min(1f, t + TangentEpsilon);
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Vector2 tangent = MacroCurve.BezierCurve(ctrlPts, t1) - MacroCurve.BezierCurve(ctrlPts, t0);
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if (tangent.sqrMagnitude < float.Epsilon)
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tangent = Vector2.up;
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else
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tangent.Normalize();
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return tangent;
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}
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#region 箭头
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private static void GenerateArrow(
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ArrowHeadData arrow,
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Vector2[] controlPoints,
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List<UIVertex> vertexList,
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List<int> indexList)
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{
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float t = Mathf.Clamp01(arrow.progress);
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Vector2 pos = MacroCurve.BezierCurve(controlPoints, t);
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Vector2 tangent = ComputeTangent(controlPoints, t);
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if (arrow.reversed)
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tangent = -tangent;
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// 深度补偿：半长偏移（箭头中心在本地x=0，尖端在+width*0.5，尾部在-width*0.5）
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pos += tangent * arrow.width * 0.5f * arrow.depthCompensation;
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int baseVert = vertexList.Count;
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GenerateArrowShape(arrow.shape, pos, tangent, arrow.width, arrow.height, arrow.color,
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vertexList, indexList, baseVert, t);
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}
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private static void GenerateArrowShape(
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ArrowShape shape,
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Vector2 position,
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Vector2 tangent,
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float width,
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float height,
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Color32 color,
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List<UIVertex> vertexList,
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List<int> indexList,
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int baseVertex,
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float progressT)
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{
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float cos = tangent.x;
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float sin = tangent.y;
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Vector2 TransformPoint(float ux, float uy)
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{
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float x = ux * width;
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float y = uy * height;
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float rx = x * cos - y * sin;
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float ry = x * sin + y * cos;
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return position + new Vector2(rx, ry);
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}
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UIVertex vert = new UIVertex
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{
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color = color,
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normal = Vector3.back,
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tangent = new Vector4(1f, 0f, 0f, -1f),
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uv0 = new Vector2(0.5f, progressT),
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uv1 = new Vector2(0f, 1f)
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};
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switch (shape)
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{
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case ArrowShape.Triangle:
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{
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vert.position = TransformPoint(0.5f, 0f);
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vertexList.Add(vert);
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vert.position = TransformPoint(-0.5f, -0.3f);
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vertexList.Add(vert);
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vert.position = TransformPoint(-0.5f, 0.3f);
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vertexList.Add(vert);
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indexList.Add(baseVertex + 0);
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indexList.Add(baseVertex + 1);
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indexList.Add(baseVertex + 2);
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break;
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}
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case ArrowShape.HollowTriangle:
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{
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float tailOff = -0.1f;
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// 外三角
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vert.position = TransformPoint(0.5f, 0f);
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vertexList.Add(vert);
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vert.position = TransformPoint(-0.5f, -0.3f);
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vertexList.Add(vert);
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vert.position = TransformPoint(-0.5f, 0.3f);
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vertexList.Add(vert);
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// 内三角（缩小 + 向尾部偏移）
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vert.position = TransformPoint(0.5f * 0.5f + tailOff, 0f);
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vertexList.Add(vert);
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vert.position = TransformPoint(-0.5f * 0.5f + tailOff, -0.3f * 0.5f * 0.6f);
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vertexList.Add(vert);
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vert.position = TransformPoint(-0.5f * 0.5f + tailOff, 0.3f * 0.5f * 0.6f);
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vertexList.Add(vert);
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indexList.Add(baseVertex + 1); indexList.Add(baseVertex + 4); indexList.Add(baseVertex + 5);
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indexList.Add(baseVertex + 1); indexList.Add(baseVertex + 5); indexList.Add(baseVertex + 2);
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indexList.Add(baseVertex + 0); indexList.Add(baseVertex + 1); indexList.Add(baseVertex + 4);
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indexList.Add(baseVertex + 0); indexList.Add(baseVertex + 4); indexList.Add(baseVertex + 3);
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indexList.Add(baseVertex + 0); indexList.Add(baseVertex + 3); indexList.Add(baseVertex + 5);
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indexList.Add(baseVertex + 0); indexList.Add(baseVertex + 5); indexList.Add(baseVertex + 2);
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break;
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}
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case ArrowShape.Arrow:
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{
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float headBaseU = 0.5f - 0.35f; // 头部基座 x=0.15
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float shaftEndU = -0.8f; // 杆尾
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vert.position = TransformPoint(0.5f, 0f);
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vertexList.Add(vert); // 0: 尖端
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vert.position = TransformPoint(headBaseU, -0.25f);
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vertexList.Add(vert); // 1: 左翼
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vert.position = TransformPoint(headBaseU, 0.25f);
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vertexList.Add(vert); // 2: 右翼
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vert.position = TransformPoint(headBaseU, -0.06f);
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vertexList.Add(vert); // 3: 杆起点下
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vert.position = TransformPoint(headBaseU, 0.06f);
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vertexList.Add(vert); // 4: 杆起点上
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vert.position = TransformPoint(shaftEndU, -0.06f);
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vertexList.Add(vert); // 5: 杆尾下
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vert.position = TransformPoint(shaftEndU, 0.06f);
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vertexList.Add(vert); // 6: 杆尾上
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indexList.Add(baseVertex + 0); indexList.Add(baseVertex + 1); indexList.Add(baseVertex + 2);
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indexList.Add(baseVertex + 2); indexList.Add(baseVertex + 4); indexList.Add(baseVertex + 6);
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indexList.Add(baseVertex + 2); indexList.Add(baseVertex + 6); indexList.Add(baseVertex + 1);
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indexList.Add(baseVertex + 1); indexList.Add(baseVertex + 6); indexList.Add(baseVertex + 5);
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indexList.Add(baseVertex + 1); indexList.Add(baseVertex + 5); indexList.Add(baseVertex + 3);
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break;
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}
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case ArrowShape.Circle:
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{
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float r = 0.4f;
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vert.position = TransformPoint(0f, 0f);
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vertexList.Add(vert);
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for (int i = 0; i < CircleArrowSides; i++)
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{
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float angle = i * Mathf.PI * 2f / CircleArrowSides;
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vert.position = TransformPoint(Mathf.Cos(angle) * r, Mathf.Sin(angle) * r);
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vertexList.Add(vert);
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}
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for (int i = 0; i < CircleArrowSides; i++)
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{
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int next = (i + 1) % CircleArrowSides;
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indexList.Add(baseVertex + 0);
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indexList.Add(baseVertex + 1 + i);
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indexList.Add(baseVertex + 1 + next);
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}
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break;
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}
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case ArrowShape.Square:
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{
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float hs = 0.35f;
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vert.position = TransformPoint(-hs, -hs);
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vertexList.Add(vert);
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vert.position = TransformPoint(hs, -hs);
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vertexList.Add(vert);
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vert.position = TransformPoint(hs, hs);
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vertexList.Add(vert);
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vert.position = TransformPoint(-hs, hs);
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vertexList.Add(vert);
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indexList.Add(baseVertex + 0); indexList.Add(baseVertex + 1); indexList.Add(baseVertex + 2);
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indexList.Add(baseVertex + 0); indexList.Add(baseVertex + 2); indexList.Add(baseVertex + 3);
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break;
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}
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case ArrowShape.ReverseArrow:
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{
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float rHeadBaseU = 0.5f - 0.35f;
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float rShaftEndU = -0.8f;
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vert.position = TransformPoint(0.5f, 0f);
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vertexList.Add(vert);
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vert.position = TransformPoint(rHeadBaseU, -0.25f);
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vertexList.Add(vert);
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vert.position = TransformPoint(rHeadBaseU, 0.25f);
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vertexList.Add(vert);
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vert.position = TransformPoint(rHeadBaseU, -0.06f);
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vertexList.Add(vert);
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vert.position = TransformPoint(rHeadBaseU, 0.06f);
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vertexList.Add(vert);
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vert.position = TransformPoint(rShaftEndU, -0.06f);
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vertexList.Add(vert);
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vert.position = TransformPoint(rShaftEndU, 0.06f);
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vertexList.Add(vert);
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indexList.Add(baseVertex + 0); indexList.Add(baseVertex + 1); indexList.Add(baseVertex + 2);
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indexList.Add(baseVertex + 2); indexList.Add(baseVertex + 4); indexList.Add(baseVertex + 6);
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indexList.Add(baseVertex + 2); indexList.Add(baseVertex + 6); indexList.Add(baseVertex + 1);
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indexList.Add(baseVertex + 1); indexList.Add(baseVertex + 6); indexList.Add(baseVertex + 5);
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indexList.Add(baseVertex + 1); indexList.Add(baseVertex + 5); indexList.Add(baseVertex + 3);
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break;
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}
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}
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}
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#endregion
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}
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}
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