+ plugins project

1 files changed, 43 insertions, 0 deletions

diff --git a/Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/VelocityModifier.cs b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/VelocityModifier.cs
new file mode 100644
index 0000000..f089abc
--- /dev/null
+++ b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/VelocityModifier.cs
@@ -0,0 +1,43 @@
+using System;
+using System.Collections.Generic;
+using MonoGame.Extended.Particles.Modifiers.Interpolators;
+
+namespace MonoGame.Extended.Particles.Modifiers
+{
+    public class VelocityModifier : Modifier
+    {
+        public List<Interpolator> Interpolators { get; set; } = new List<Interpolator>();
+
+        public float VelocityThreshold { get; set; }
+
+        public override unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator)
+        {
+            var velocityThreshold2 = VelocityThreshold*VelocityThreshold;
+            var n = Interpolators.Count;
+
+            while (iterator.HasNext)
+            {
+                var particle = iterator.Next();
+                var velocity2 = particle->Velocity.LengthSquared();
+
+                if (velocity2 >= velocityThreshold2)
+                {
+                    for (var i = 0; i < n; i++)
+                    {
+                        var interpolator = Interpolators[i];
+                        interpolator.Update(1, particle);
+                    }
+                }
+                else
+                {
+                    var t = (float) Math.Sqrt(velocity2)/VelocityThreshold;
+                    for (var i = 0; i < n; i++)
+                    {
+                        var interpolator = Interpolators[i];
+                        interpolator.Update(t, particle);
+                    }
+                }
+            }
+        }
+    }
+}
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