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/VortexModifier.cs                    | 30 ++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/VortexModifier.cs

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

diff --git a/Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/VortexModifier.cs b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/VortexModifier.cs
new file mode 100644
index 0000000..03a9999
--- /dev/null
+++ b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Particles/Modifiers/VortexModifier.cs
@@ -0,0 +1,30 @@
+using Microsoft.Xna.Framework;
+
+namespace MonoGame.Extended.Particles.Modifiers
+{
+    public unsafe class VortexModifier : Modifier
+    {
+        // Note: not the real-life one
+        private const float _gravConst = 100000f;
+
+        public Vector2 Position { get; set; }
+        public float Mass { get; set; }
+        public float MaxSpeed { get; set; }
+
+        public override void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator)
+        {
+            while (iterator.HasNext)
+            {
+                var particle = iterator.Next();
+                var diff = Position + particle->TriggerPos - particle->Position;
+
+                var distance2 = diff.LengthSquared();
+
+                var speedGain = _gravConst*Mass/distance2*elapsedSeconds;
+                // normalize distances and multiply by speedGain
+                diff.Normalize();
+                particle->Velocity += diff*speedGain;
+            }
+        }
+    }
+}
\ No newline at end of file
-- 
cgit v1.1-26-g67d0