103 lines
2.8 KiB
C#
103 lines
2.8 KiB
C#
using System.Collections.Generic;
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using UnityEngine;
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[RequireComponent(typeof(LineRenderer))]
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public class PhysicLineSegment : MonoBehaviour
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{
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public float segmentSpacing = 0.1f;
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public int k = 30;
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public List<VerletParticle> particles = new();
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private List<VerletStick> sticks = new();
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[HideInInspector]
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public LineRenderer lineRenderer;
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private int segmentCount;
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public float gravity = -9.8f;
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private float originalLength;
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public void Initialize(Vector3 start, Vector3 end)
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{
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particles.Clear();
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sticks.Clear();
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if (lineRenderer != null)
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{
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lineRenderer.positionCount = 0;
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}
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originalLength = Vector3.Distance(start, end);
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segmentCount = Mathf.RoundToInt(originalLength / segmentSpacing);
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lineRenderer = GetComponent<LineRenderer>();
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// Initialize particles
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for (int i = 0; i < segmentCount; i++)
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{
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var particle = new VerletParticle(Vector3.Lerp(start, end, i / (float)segmentCount));
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particles.Add(particle);
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}
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// Initialize sticks
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for (int i = 0; i < segmentCount - 1; i++)
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{
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sticks.Add(new VerletStick(particles[i], particles[i + 1], segmentSpacing));
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}
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// Lock the first particle
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particles[0].isLocked = true;
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lineRenderer.positionCount = segmentCount;
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}
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void FixedUpdate()
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{
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UpdateLine();
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for (int i = 0; i < segmentCount; i++)
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{
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if (lineRenderer != null)
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{
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lineRenderer.SetPosition(i, particles[i].position);
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}
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}
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}
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void UpdateLine()
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{
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// Apply gravity to particles
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for (int i = 1; i < particles.Count; i++)
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{
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particles[i].ApplyForce(Vector3.up * gravity * Time.deltaTime);
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particles[i].UpdatePosition();
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}
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// Update sticks
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for (int ik = 0; ik < k; ik++)
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{
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foreach (var stick in sticks)
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{
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stick.UpdateStick();
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}
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}
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}
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public void UpdatePlug(Transform plug)
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{
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if (plug && particles.Count > 1)
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{
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Vector3 plugPosition = particles[^1].position;
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float plugLength = plug.GetComponent<SpriteRenderer>().bounds.size.y;
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Vector3 direction = particles[^1].position - particles[^2].position;
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float angle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg;
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plug.rotation = Quaternion.Euler(0, 0, angle - 90f);
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plug.position = plugPosition + direction.normalized * (plugLength / 2);
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}
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}
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public void UpdateStart(Vector3 newStartPosition)
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{
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if (particles.Count > 0)
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{
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particles[0].position = newStartPosition;
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}
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}
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} |