57 lines
1.8 KiB
C#
57 lines
1.8 KiB
C#
namespace TanksServer.GameLogic;
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internal sealed class MoveBullets(
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MapEntityManager entityManager,
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IOptions<GameRules> options
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) : ITickStep
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{
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private readonly double _smartBulletInertia = options.Value.SmartBulletInertia;
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public ValueTask TickAsync(TimeSpan delta)
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{
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foreach (var bullet in entityManager.Bullets)
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MoveBullet(bullet, delta);
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return ValueTask.CompletedTask;
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}
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private void MoveBullet(Bullet bullet, TimeSpan delta)
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{
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if (bullet.IsSmart && TryGetSmartRotation(bullet.Position, bullet.Owner, out var wantedRotation))
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{
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var inertiaFactor = _smartBulletInertia * delta.TotalSeconds;
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var difference = wantedRotation - bullet.Rotation;
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bullet.Rotation += difference * inertiaFactor;
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}
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bullet.Speed *= 1 + (bullet.Acceleration * delta.TotalSeconds);
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var speed = bullet.Speed * delta.TotalSeconds;
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var angle = bullet.Rotation * 2 * Math.PI;
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bullet.Position = new FloatPosition(
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bullet.Position.X + Math.Sin(angle) * speed,
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bullet.Position.Y - Math.Cos(angle) * speed
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);
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}
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private bool TryGetSmartRotation(FloatPosition position, Player bulletOwner, out double rotation)
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{
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var nearestEnemy = entityManager.Tanks
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.Where(t => t.Owner != bulletOwner)
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.MinBy(t => position.Distance(t.Position));
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if (nearestEnemy == null)
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{
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rotation = double.NaN;
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return false;
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}
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var rotationRadians = Math.Atan2(
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y: nearestEnemy.Position.Y - position.Y,
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x: nearestEnemy.Position.X - position.X
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) + (Math.PI / 2);
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rotation = rotationRadians / (2 * Math.PI);
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return true;
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}
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}
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