51 lines
2.4 KiB
C#
51 lines
2.4 KiB
C#
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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namespace Dreamteck.Splines.Primitives
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{
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public class Spiral : SplinePrimitive
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{
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public float startRadius = 1f;
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public float endRadius = 1f;
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public float stretch = 1f;
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public int iterations = 3;
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public bool clockwise = true;
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public AnimationCurve curve = new AnimationCurve();
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public override Spline.Type GetSplineType()
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{
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return Spline.Type.Bezier;
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}
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protected override void Generate()
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{
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base.Generate();
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closed = false;
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CreatePoints(iterations * 4 + 1, SplinePoint.Type.SmoothMirrored);
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float radiusDelta = Mathf.Abs(endRadius - startRadius);
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float radiusDeltaPercent = radiusDelta / Mathf.Max(Mathf.Abs(endRadius), Mathf.Abs(startRadius));
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float multiplier = 1f;
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if (endRadius > startRadius) multiplier = -1;
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float angle = 0f;
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float str = 0f;
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float angleDirection = clockwise ? 1f : -1f;
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for (int i = 0; i <= iterations * 4; i++)
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{
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float percent = curve.Evaluate((float)i / (iterations * 4));
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float radius = Mathf.Lerp(startRadius, endRadius, percent);
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Quaternion rot = Quaternion.AngleAxis(angle, Vector3.up);
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points[i].position = rot * Vector3.forward / 2f * radius + Vector3.up * str;
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Quaternion tangentRot = Quaternion.identity;
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if (multiplier > 0) tangentRot = Quaternion.AngleAxis(Mathf.Lerp(0f, 90f * 0.16f * angleDirection, radiusDeltaPercent * percent), Vector3.up);
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else tangentRot = Quaternion.AngleAxis(Mathf.Lerp(0f, -90f * 0.16f * angleDirection, (1f - percent) * radiusDeltaPercent), Vector3.up);
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if (clockwise) points[i].tangent = points[i].position - (tangentRot * rot * Vector3.right * radius + Vector3.up * stretch / 4f) * 2 * (Mathf.Sqrt(2f) - 1f) / 3f;
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else points[i].tangent = points[i].position + (tangentRot * rot * Vector3.right * radius - Vector3.up * stretch / 4f) * 2 * (Mathf.Sqrt(2f) - 1f) / 3f;
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points[i].tangent2 = points[i].position - (points[i].tangent - points[i].position);
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str += stretch / 4f;
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angle += 90f * angleDirection;
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}
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}
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}
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}
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