72 lines
2.3 KiB
C#
72 lines
2.3 KiB
C#
using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.Splines;
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using Unity.Mathematics;
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namespace UnityEditor.Splines
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{
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struct BezierBuilder
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{
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readonly List<BezierKnot> m_ResultKnots;
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readonly bool m_Closed;
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int knotCount => m_ResultKnots.Count;
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public int segmentCount => m_Closed ? m_ResultKnots.Count : m_ResultKnots.Count - 1;
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public BezierBuilder(List<BezierKnot> result, bool closed, int targetKnotCount)
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{
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m_ResultKnots = result;
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for (int i = 0; i < targetKnotCount; ++i)
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{
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var knot = new BezierKnot();
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knot.Rotation = quaternion.identity;
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m_ResultKnots.Add(knot);
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}
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m_Closed = closed;
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}
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public void SetKnot(int index, float3 position, float3 tangentIn, float3 tangentOut, quaternion rotation)
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{
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var current = m_ResultKnots[index];
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current.Position = position;
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current.TangentIn = tangentIn;
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current.TangentOut = tangentOut;
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current.Rotation = rotation;
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m_ResultKnots[index] = current;
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}
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void GetSegmentEndIndex(int index, out int endIndex)
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{
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endIndex = m_Closed ? (index + 1) % knotCount : index + 1;
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}
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public void SetSegment(int index, float3 posA, float3 tangentOutA, quaternion rotationA, float3 posB, float3 tangentInB, quaternion rotationB)
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{
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GetSegmentEndIndex(index, out int nextIndex);
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var current = m_ResultKnots[index];
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current.Position = posA;
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current.Rotation = rotationA;
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current.TangentOut = tangentOutA;
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var next = m_ResultKnots[nextIndex];
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next.Position = posB;
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next.Rotation = rotationB;
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next.TangentIn = tangentInB;
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if (!m_Closed)
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{
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if (index == 0)
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current.TangentIn = -current.TangentOut;
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else if (nextIndex == knotCount - 1)
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next.TangentOut = -next.TangentIn;
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}
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m_ResultKnots[index] = current;
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m_ResultKnots[nextIndex] = next;
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}
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}
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}
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