Added Holes to the mix

PixelEngine/BlackHole.cs

@@ -0,0 +1,20 @@
+using System.Numerics;
+
+namespace PixelEngine;
+
+public class BlackHole : Hole
+{
+    public BlackHole(Vector2 position, int radius, float mass) : base(position, mass)
+    {
+        this.radius = radius;
+    }
+
+    public override void Spawn(Fluid fluid)
+    {
+        fluid.reduceDensity((int)position.X, (int)position.Y, mass, radius);
+    }
+
+    public override Vector2 position { get; set; }
+    public int radius { get; set; }
+    public override float mass { get; set; }
+}

PixelEngine/Fluid.cs

@@ -112,11 +112,11 @@ public class Fluid
       this.density[index] += amount;
     }
     
-    public void reduceDensity(int x, int y, float amount) {
+    public void reduceDensity(int x, int y, float amount, int rSize) {
 
-      for (int i = -10; i < 10; i++)
+      for (int i = -rSize; i < rSize; i++)
       {
-        for (int j = -10; j < 10; j++)
+        for (int j = -rSize; j < rSize; j++)
         {
           int index = IX(x + i, y + j);
           

PixelEngine/Hole.cs

@@ -0,0 +1,15 @@
+using System.Numerics;
+
+namespace PixelEngine;
+
+public abstract class Hole
+{
+    public Hole(Vector2 position, float mass)
+    {
+        this.position = position;
+        this.mass = mass;
+    }
+    public abstract void Spawn(Fluid fluid);
+    public abstract Vector2 position { get; set; }
+    public abstract float mass { get; set; }
+}

PixelEngine/Program.cs

@@ -15,6 +15,8 @@ var N = 64;
 var Scale = 10;
 var Iter = 10;
 float t = 0;
+int whiteholes = 4;
+int blackholes = 1;
 
 Fluid fluid;
 
@@ -23,10 +25,32 @@ InitWindow(N * Scale, N * Scale, "Raylib_CsLo");
 SetTargetFPS(60);
 Random rd = new Random();
 
-
 var pMouseX = GetMouseX();
 var pMouseY = GetMouseY();
 
+var whiteholesA = new WhiteHole[whiteholes];
+var blackholesA = new BlackHole[blackholes];
+
+for (int i = 0; i < whiteholes; i++)
+{
+    whiteholesA[i] = new WhiteHole(
+        new Vector2(rd.Next(3, N - 3), rd.Next(3, N - 3)),
+        new Vector2(rd.Next(50, 100), rd.Next(50, 100)),
+        rd.Next(0, 100),
+        rd.Next(0, 100)
+    );
+}
+
+for (int i = 0; i < blackholes; i++)
+{
+    blackholesA[i] = new BlackHole(
+        new Vector2(rd.Next(3, N - 3), rd.Next(3, N - 3)),
+        rd.Next(0, 3),
+        rd.Next(0,200)
+    );
+}
+
+
 
 while (!WindowShouldClose())
 {
@@ -58,7 +82,7 @@ while (!WindowShouldClose())
         fluid.addDensity((int)GetMouseX() / Scale, (int)GetMouseY() / Scale, 100);
     else if (IsMouseButtonDown(MouseButton.MOUSE_BUTTON_RIGHT))
     {
-        fluid.reduceDensity((int)GetMouseX() / Scale, (int)GetMouseY() / Scale, 100);
+        fluid.reduceDensity((int)GetMouseX() / Scale, (int)GetMouseY() / Scale, 100, 5);
         
         
         //TODO: Suction for Density Reduction
@@ -70,8 +94,22 @@ while (!WindowShouldClose())
 
 
 
-    fluid.addDensity(N - 3, 3,  200);
+
-    fluid.addVelocity(N - 3 , 3,  -10f, -10f);
+    foreach (var hole in blackholesA)
+    {
+        hole.Spawn(fluid);
+    }
+    
+    foreach (var hole in whiteholesA)
+    {
+        hole.Spawn(fluid);
+    }
+    
+    
+    /*fluid.addDensity(N - 3 , 3,  100);
+    fluid.addVelocity(N - 3 , 3,  -10f, 0);*/
+    
+    
         
 
     /*if (GetMouseX() != pMouseX || GetMouseY() != pMouseY)

PixelEngine/WhiteHole.cs

@@ -0,0 +1,23 @@
+using System.Numerics;
+
+namespace PixelEngine;
+
+public class WhiteHole : Hole 
+{
+    public override void Spawn(Fluid fluid)
+    {
+        fluid.addDensity((int) position.X, (int) position.Y,  mass);
+        fluid.addVelocity((int) position.X, (int) position.Y,  direction.X * speed, direction.Y * speed);
+    }
+
+    public override Vector2 position { get; set; }
+    public Vector2 direction { get; set; }
+    public override float mass { get; set; }
+    public float speed { get; set; }
+
+    public WhiteHole(Vector2 position, Vector2 direction, float mass, float speed) : base(position, mass)
+    {
+        this.direction = direction;
+        this.speed = speed;
+    }
+}