From acea7b2e728787a0d83bbf83c8c1f042d2c32e7e Mon Sep 17 00:00:00 2001
From: chai <215380520@qq.com>
Date: Mon, 3 Jun 2024 10:15:45 +0800
Subject: + plugins project

---
 .../Modifiers/VelocityModifier.cs                  | 43 ++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/VelocityModifier.cs

(limited to 'Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/VelocityModifier.cs')

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);
+                    }
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
-- 
cgit v1.1-26-g67d0