restructured project

ParticleSimulation/ParticleNode.cs

@@ -0,0 +1,38 @@
+using Godot;
+
+// ReSharper disable once CheckNamespace
+// ReSharper disable once ClassNeverInstantiated.Global
+public class ParticleNode : Node2D
+{
+    private Label _labelNode;
+    private Sprite _spriteNode;
+    public Vector2 CurrentSimulationPosition = new Vector2();
+
+    public Vector2 LastSimulationPosition;
+    public bool WasTeleportedLast = true;
+    public int SimulationId;
+
+    public override void _Ready()
+    {
+        _spriteNode = GetNode<Sprite>("Sprite");
+        _labelNode = GetNode<Label>("Label");
+    }
+
+    public override void _Process(float delta)
+    {
+        Position = WasTeleportedLast == false
+            ? LastSimulationPosition.LinearInterpolate(CurrentSimulationPosition,
+                GetParent<Node2D>().GetParent<ParticleSimulationScene>().PhysicsInterpolationFraction)
+            : CurrentSimulationPosition;
+    }
+
+    public void SetLabelText(string text)
+    {
+        _labelNode.Text = text;
+    }
+
+    public void SetColor(float hue, float saturation, float opacity)
+    {
+        _spriteNode.Modulate = Color.FromHsv(hue, saturation, 1, opacity);
+    }
+}

ParticleSimulation/ParticleNode.tscn

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+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://ParticleSimulation/ParticleNode.cs" type="Script" id=1]
+[ext_resource path="res://textures/particle_noborder.png" type="Texture" id=2]
+
+
+[node name="ParticleNode" type="Node2D"]
+script = ExtResource( 1 )
+
+[node name="Sprite" type="Sprite" parent="."]
+scale = Vector2( 0.25, 0.25 )
+texture = ExtResource( 2 )
+
+[node name="Label" type="Label" parent="."]
+visible = false
+margin_left = -18.0
+margin_top = -23.0
+margin_right = 18.0
+margin_bottom = -9.0
+text = "0.05"
+__meta__ = {
+"_edit_use_anchors_": false
+}

ParticleSimulation/ParticleSimulationScene.cs

@@ -0,0 +1,69 @@
+using Godot;
+using Particles.ParticleSimulation;
+
+// ReSharper disable once CheckNamespace
+// ReSharper disable once ClassNeverInstantiated.Global
+public class ParticleSimulationScene : Node2D
+{
+    private Node2D _particleNodes;
+
+    private ParticleSimulation _particleSimulation;
+    public float PhysicsInterpolationFraction;
+
+    public void Initialize(int nParticles)
+    {
+        _particleNodes = GetNode<Node2D>("ParticleNodes");
+        GD.Randomize();
+        ulong randomSeed = GD.Randi();
+        GD.Seed(randomSeed);
+        GD.Print("Last Seed: " + randomSeed);
+        var viewSize = GetViewportRect().Size;
+        var zoom = GetNode<Camera2D>("Camera2D").Zoom;
+        var spaceSize = new Vector2(viewSize.x * zoom.x, viewSize.y * zoom.y);
+        _particleSimulation = new ParticleSimulation
+        {
+            SpaceSize = spaceSize
+        };
+        _particleSimulation.Initialize(nParticles);
+        foreach (var id in _particleSimulation.LastParticlesAdded) CreateParticleNode(id);
+    }
+
+    public override void _Process(float delta)
+    {
+        if (Input.IsActionJustPressed("quit")) GetTree().Quit();
+        if (Input.IsActionJustPressed("reset")) GetTree().ReloadCurrentScene();
+        PhysicsInterpolationFraction = Engine.GetPhysicsInterpolationFraction();
+    }
+
+    public override void _PhysicsProcess(float delta)
+    {
+        _particleSimulation.Update();
+        foreach (var id in _particleSimulation.LastParticlesRemoved)
+        {
+            var particleNode = _particleNodes.GetNode<ParticleNode>(id.ToString());
+            particleNode.Free();
+        }
+
+        foreach (var id in _particleSimulation.LastParticlesAdded) CreateParticleNode(id);
+
+        var particleNodes = _particleNodes.GetChildren();
+        foreach (ParticleNode particleNode in particleNodes)
+        {
+            var simulationParticle = _particleSimulation.GetParticle(particleNode.SimulationId);
+            particleNode.LastSimulationPosition = particleNode.Position;
+            particleNode.CurrentSimulationPosition = simulationParticle.Position;
+            particleNode.SetColor(simulationParticle.Type.Hue, simulationParticle.Health,
+                Mathf.Clamp(simulationParticle.AverageSpeed / 1.5f, 1f, 1f));
+            particleNode.WasTeleportedLast = simulationParticle.WasTeleportedLast;
+        }
+    }
+
+    private void CreateParticleNode(int id)
+    {
+        var particleScene = GD.Load<PackedScene>("res://ParticleSimulation/ParticleNode.tscn");
+        var particleNode = particleScene.Instance<ParticleNode>();
+        particleNode.Name = id.ToString();
+        particleNode.SimulationId = id;
+        _particleNodes.AddChild(particleNode);
+    }
+}

ParticleSimulation/ParticleSimulationScene.tscn

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+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://ParticleSimulation/ParticleSimulationScene.cs" type="Script" id=1]
+
+
+[node name="ParticleSimulationScene" type="Node2D"]
+script = ExtResource( 1 )
+
+[node name="ParticleNodes" type="Node2D" parent="."]
+
+[node name="Camera2D" type="Camera2D" parent="."]
+anchor_mode = 0
+current = true
+zoom = Vector2( 1.35, 1.35 )