53 lines
1.3 KiB
C#
53 lines
1.3 KiB
C#
using Godot;
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using System;
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public class Train : Spatial
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{
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[Export]
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private float _speed = 1.0f;
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[Export]
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private NodePath _railwayPath;
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private Railway _railway;
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private readonly PathFollow _pathFollow = new PathFollow
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{
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RotationMode = PathFollow.RotationModeEnum.Oriented
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};
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private float _distance = 0;
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// Called when the node enters the scene tree for the first time.
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public override void _Ready()
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{
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_railway = GetNode<Railway>(_railwayPath) as Railway;
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_railway.AddPathFollower(_pathFollow);
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}
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// Called every frame. 'delta' is the elapsed time since the previous frame.
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public override void _Process(float delta)
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{
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var length = _railway.Curve.GetBakedLength();
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// keep track of total distance
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_distance += delta * _speed;
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// wrap at 2x total distance
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_distance %= length * 2;
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var distance = PingPong(_distance, length);
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_pathFollow.Offset = distance;
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Translation = _pathFollow.Translation;
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Rotation = _pathFollow.Rotation;
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}
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// poor mans branching ping pong
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private float PingPong(float t, float length)
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{
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var tml = t % length;
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return t > length
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? length - tml
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: tml;
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}
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}
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