113 lines
3.7 KiB
C#
113 lines
3.7 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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namespace BF
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{
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public class DrawBezierLine : MonoBehaviour
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{
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public LineRenderer lineRender;
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private Vector3 _startPoint = Vector3.zero;
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private Vector3 _endPoint = Vector3.zero;
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private Vector3 _controlPoint1 = Vector3.zero;
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private Vector3 _controlPoint2 = Vector3.zero;
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// 曲线上的路径点数量，值越大，取得的路径点越多，曲线越平滑
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private int drawPointCount = 30;
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private bool isDraw = false;
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private bool useCubicBezier = true;
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public void SetStartPoint(float x, float y, float z)
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{
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_startPoint = new Vector3(x, y, z);
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}
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public void SetEndPoint(float x, float y, float z)
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{
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_endPoint = new Vector3(x, y, z);
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}
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public void SetControlPoint1(float x, float y, float z)
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{
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_controlPoint1 = new Vector3(x, y, z);
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}
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public void SetControlPoint2(float x, float y, float z)
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{
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_controlPoint2 = new Vector3(x, y, z);
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}
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public void SetDrawPointCount(int count)
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{
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drawPointCount = count;
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}
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public void DrawLine()
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{
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isDraw = true;
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}
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public void ClearLine()
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{
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isDraw = false;
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lineRender.positionCount = 0;
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}
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public Vector3[] GetPathList()
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{
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Vector3[] positions = new Vector3[lineRender.positionCount];
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lineRender.GetPositions(positions);
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return positions;
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}
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public void SetUseCubicBezier(bool use)
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{
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useCubicBezier = use;
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}
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void Update()
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{
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if (!isDraw)
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{
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return;
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}
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isDraw = false;
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if (drawPointCount <= 0)
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{
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return;
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}
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lineRender.positionCount = drawPointCount;
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lineRender.SetPosition(0, _startPoint);
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for (int i = 1; i < drawPointCount; i++)
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{
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var t = (i + 1) / (float)drawPointCount;
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if (useCubicBezier)
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{
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var pathPoint = GetPointInCubicBezierCurve(t, _startPoint, _controlPoint1, _controlPoint2, _endPoint);//使用贝塞尔曲线的公式取得t时的路径点
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lineRender.SetPosition(i, pathPoint);
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}
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else
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{
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var pathPoint = GetBezierPoint(t, _startPoint, _controlPoint1, _endPoint);//使用贝塞尔曲线的公式取得t时的路径点
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lineRender.SetPosition(i, pathPoint);
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}
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}
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}
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/// <param name="t">0到1的值，0获取曲线的起点，1获得曲线的终点</param>
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/// <param name="start">曲线的起始位置</param>
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/// <param name="center">决定曲线形状的控制点</param>
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/// <param name="end">曲线的终点</param>
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public static Vector3 GetBezierPoint(float t, Vector3 start, Vector3 controlPoint, Vector3 end)
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{
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return (1 - t) * (1 - t) * start + 2 * t * (1 - t) * controlPoint + t * t * end;
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}
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public Vector3 GetPointInCubicBezierCurve(float t, Vector3 startPoint, Vector3 controlPoint1, Vector3 controlPoint2, Vector3 endPoint)
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{
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var A = startPoint * (Mathf.Pow(-t, 3) + 3 * Mathf.Pow(t, 2) - 3 * t + 1);
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var B = controlPoint1 * (3 * Mathf.Pow(t, 3) - 6 * Mathf.Pow(t, 2) + 3 * t);
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var C = controlPoint2 * (-3 * Mathf.Pow(t, 3) + 3 * Mathf.Pow(t, 2));
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var D = endPoint * (Mathf.Pow(t, 3));
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return A + B + C + D;
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}
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}
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} |