(61d00a474) v0.9.7.1

2020-03-04 13:04:10 +01:00
parent 3c50efa5c9
commit 3c09ebe02f
5086 changed files with 786063 additions and 295871 deletions
@@ -0,0 +1,80 @@
+/* Original source Farseer Physics Engine:
+ * Copyright (c) 2014 Ian Qvist, http://farseerphysics.codeplex.com
+ * Microsoft Permissive License (Ms-PL) v1.1
+ */
+
+using System.Collections.Generic;
+using Microsoft.Xna.Framework;
+
+namespace FarseerPhysics.Fluids
+{
+    public class FluidParticle
+    {
+        public Vector2 Position;
+        public Vector2 PreviousPosition;
+
+        public Vector2 Velocity;
+        public Vector2 Acceleration;
+
+        internal FluidParticle(Vector2 position)
+        {
+            Neighbours = new List<FluidParticle>();
+            IsActive = true;
+            MoveTo(position);
+
+            Damping = 0.0f;
+            Mass = 1.0f;
+        }
+
+        public bool IsActive { get; set; }
+
+        public List<FluidParticle> Neighbours { get; private set; }
+
+        // For gameplay purposes
+        public float Density { get; internal set; }
+        public float Pressure { get; internal set; }
+
+        // Other properties
+        public int Index { get; internal set; }
+
+        // Physics properties
+        public float Damping { get; set; }
+        public float Mass { get; set; }
+
+        public void MoveTo(Vector2 p)
+        {
+            Position = p;
+            PreviousPosition = p;
+
+            Velocity = Vector2.Zero;
+            Acceleration = Vector2.Zero;
+        }
+
+        public void ApplyForce(ref Vector2 force)
+        {
+            Acceleration += force * Mass;
+        }
+
+        public void ApplyImpulse(ref Vector2 impulse)
+        {
+            Velocity += impulse;
+        }
+
+        public void Update(float deltaTime)
+        {
+            Velocity += Acceleration * deltaTime;
+
+            Vector2 delta = (1.0f - Damping) * Velocity * deltaTime;
+
+            PreviousPosition = Position;
+            Position += delta;
+
+            Acceleration = Vector2.Zero;
+        }
+
+        public void UpdateVelocity(float deltaTime)
+        {
+            Velocity = (Position - PreviousPosition) / deltaTime;
+        }
+    }
+}