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Simple particle interaction

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This commit is contained in:
orosmatthew 2021-12-26 21:16:28 -05:00
parent f0a8e7baeb
commit 6cdbf2d9e5
7 changed files with 87 additions and 14 deletions
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74
Main.cs
View File

@ -1,15 +1,20 @@
using System.Collections.Generic;
using System.Linq;
using Godot;
public class Main : Node2D
{
private const int ParticleScreenPadding = 16;
private readonly List<ParticleType> _particleTypes = new List<ParticleType>();
private List<Particle> _particles;
public override void _Ready()
{
GD.Randomize();
InitializeParticleTypes(5);
InitializeParticles(50);
InitializeParticleTypes(10);
InitializeParticles(200);
_particles = GetNode<Node2D>("Particles").GetChildren().Cast<Particle>().ToList();
}
public override void _Process(float delta)
@ -18,6 +23,11 @@ public class Main : Node2D
if (Input.IsActionJustPressed("reset")) GetTree().ReloadCurrentScene();
}
public override void _PhysicsProcess(float delta)
{
UpdateParticles();
}
private void InitializeParticleTypes(int nTypes)
{
for (var i = 0; i < nTypes; i++)
@ -28,6 +38,10 @@ public class Main : Node2D
};
_particleTypes.Add(type);
}
foreach (var type1 in _particleTypes)
foreach (var type2 in _particleTypes)
type1.AddRelationship(type2, 20, (float) GD.RandRange(25, 60), (float) GD.RandRange(-0.33, 0.35));
}
private void InitializeParticles(int nParticles)
@ -40,7 +54,7 @@ public class Main : Node2D
GetNode<Node2D>("Particles").AddChild(particle);
particle.Position = GetRandomParticlePosition();
particle.Type = _particleTypes[typeCount];
if (typeCount < _particleTypes.Count - 1)
typeCount++;
else
@ -50,10 +64,58 @@ public class Main : Node2D
private Vector2 GetRandomParticlePosition()
{
const int padding = 32;
var viewportRect = GetViewportRect();
var position = new Vector2((float) GD.RandRange(padding, viewportRect.Size.x - padding),
(float) GD.RandRange(padding, viewportRect.Size.y - padding));
var position = new Vector2(
(float) GD.RandRange(ParticleScreenPadding, viewportRect.Size.x - ParticleScreenPadding),
(float) GD.RandRange(ParticleScreenPadding, viewportRect.Size.y - ParticleScreenPadding));
return position;
}
private void UpdateParticles()
{
var viewportRect = GetViewportRect();
foreach (var p1 in _particles)
{
foreach (var p2 in _particles)
{
if (p1 == p2)
continue;
var distance = p1.Position.DistanceTo(p2.Position);
if (distance > 60f)
continue;
var direction = p1.Position.DirectionTo(p2.Position);
// collision force
if (distance < 20)
{
const float collisionStretch = 1f;
const float collisionOffset = 13f;
const float collisionFlatten = 1f;
var rawCollisionForce = -Mathf.Pow(Mathf.E, -(collisionStretch * distance - collisionOffset)) /
collisionFlatten;
var clampedCollisionForce = Mathf.Clamp(rawCollisionForce, -1f, 1f);
p1.Velocity += direction * clampedCollisionForce;
}
// particle relationship force
var props = p1.Type.GetRelationship(p2.Type);
if (props.Force != 0f && distance >= props.MinRadius && distance <= props.MaxRadius)
{
var slope = props.Force / ((props.MaxRadius - props.MinRadius) / 2f);
var rawParticleForce = -slope * Mathf.Abs(distance - (props.MinRadius + props.MaxRadius) / 2f) +
props.Force;
p1.Velocity += direction * rawParticleForce;
}
p1.Velocity = p1.Velocity.Clamped(3f);
}
var position = p1.Position;
position += p1.Velocity;
p1.Velocity *= 0.95f;
position.x = Mathf.Clamp(position.x, ParticleScreenPadding, viewportRect.Size.x - ParticleScreenPadding);
position.y = Mathf.Clamp(position.y, ParticleScreenPadding, viewportRect.Size.y - ParticleScreenPadding);
p1.Position = position;
}
}
}

2
Particle.cs
View File

@ -5,6 +5,8 @@ public class Particle : Node2D
private Sprite _spriteNode;
private ParticleType _type;
public Vector2 Velocity { get; set; }
public ParticleType Type
{
get => _type;

1
Particle.tscn
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@ -7,4 +7,5 @@
script = ExtResource( 2 )
[node name="Sprite" type="Sprite" parent="."]
scale = Vector2( 0.25, 0.25 )
texture = ExtResource( 1 )

9
ParticleType.cs
View File

@ -17,11 +17,11 @@ public struct ParticleRelationshipProps
public class ParticleType
{
private float _hue;
private readonly Dictionary<ParticleType, ParticleRelationshipProps> _particleRelationships =
new Dictionary<ParticleType, ParticleRelationshipProps>();
private float _hue;
public float Hue
{
get => _hue;
@ -35,4 +35,9 @@ public class ParticleType
var props = new ParticleRelationshipProps(minRadius, maxRadius, force);
_particleRelationships[type] = props;
}
public ParticleRelationshipProps GetRelationship(ParticleType type)
{
return _particleRelationships[type];
}
}

2
Particles.csproj
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@ -1,5 +1,7 @@
<Project Sdk="Godot.NET.Sdk/3.3.0">
<PropertyGroup>
<TargetFramework>net472</TargetFramework>
<Configurations>Debug;ExportDebug;ExportRelease;Release</Configurations>
<Platforms>AnyCPU</Platforms>
</PropertyGroup>
</Project>

7
Particles.sln
View File

@ -7,13 +7,16 @@ Global
Debug|Any CPU = Debug|Any CPU
ExportDebug|Any CPU = ExportDebug|Any CPU
ExportRelease|Any CPU = ExportRelease|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{E15A1F42-C497-4EDE-8944-84CB055B33CB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{E15A1F42-C497-4EDE-8944-84CB055B33CB}.Debug|Any CPU.Build.0 = Debug|Any CPU
{E15A1F42-C497-4EDE-8944-84CB055B33CB}.ExportDebug|Any CPU.ActiveCfg = ExportDebug|Any CPU
{E15A1F42-C497-4EDE-8944-84CB055B33CB}.ExportDebug|Any CPU.Build.0 = ExportDebug|Any CPU
{E15A1F42-C497-4EDE-8944-84CB055B33CB}.ExportRelease|Any CPU.ActiveCfg = ExportRelease|Any CPU
{E15A1F42-C497-4EDE-8944-84CB055B33CB}.ExportRelease|Any CPU.Build.0 = ExportRelease|Any CPU
{E15A1F42-C497-4EDE-8944-84CB055B33CB}.ExportRelease|Any CPU.ActiveCfg = Debug|Any CPU
{E15A1F42-C497-4EDE-8944-84CB055B33CB}.ExportRelease|Any CPU.Build.0 = Debug|Any CPU
{E15A1F42-C497-4EDE-8944-84CB055B33CB}.Release|Any CPU.ActiveCfg = Release|Any CPU
{E15A1F42-C497-4EDE-8944-84CB055B33CB}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
EndGlobal

6
project.godot
View File

@ -16,10 +16,8 @@ config/icon="res://icon.png"
[display]
window/size/width=1920
window/size/height=1080
window/size/resizable=false
window/size/borderless=true
window/size/width=1600
window/size/height=900
[input]