stride/samples/Particles/ParticlesSample/ParticlesSample.Game/RotateEntity.cs

// Copyright (c) .NET Foundation and Contributors (https://dotnetfoundation.org/ & https://stride3d.net) and Silicon Studio Corp. (https://www.siliconstudio.co.jp)
// Distributed under the MIT license. See the LICENSE.md file in the project root for more information.
using System.Linq;
using System.Threading.Tasks;
using Stride.Core.Mathematics;
using Stride.Engine;

namespace ParticlesSample
{
    /// <summary>
    /// Rotate the entity when user slide its finger on the screen.
    /// </summary>
    public class RotateEntity : AsyncScript
    {
        public override async Task Execute()
        {
            var rotationSpeed = 0f;

            while (Game.IsRunning)
            {
                await Script.NextFrame();

                if (Input.PointerEvents.Any())
                    rotationSpeed = 200f * Input.PointerEvents.Sum(x => x.DeltaPosition.X);

                rotationSpeed *= 0.93f;
                var elapsedTime = (float)Game.UpdateTime.Elapsed.TotalSeconds;
                Entity.Transform.Rotation *= Quaternion.RotationY(rotationSpeed * elapsedTime);
            }
        }
    }
}