Initial commit

.gitattributes

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+# Normalize EOL for all files that Git considers text files.
+* text=auto eol=lf

.gitignore

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+# Godot 4+ specific ignores
+.godot/

game_logic/game_logic.gd

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+extends Node
+class_name GameLogic
+
+const LOGIC_TICKS_PER_SECOND: float = 20.;
+const LOGIC_SECONDS_PER_TICK = 1. / LOGIC_TICKS_PER_SECOND;
+
+## Neutral player owning all non-conquered planets.
+@export var neutral_player: Player
+
+## Game players.
+@export var players: Array[Player] = []
+
+## Game planets.
+@export var planets: Array[Planet] = []
+
+var ticks_count: int
+var extra_time: float
+
+signal game_start(game: GameLogic)
+signal game_tick(game: GameLogic, tick: int)
+
+func _ready() -> void:
+	_game_init()
+	game_start.emit(self)
+
+func _game_init() -> void:
+	ticks_count = 0
+	extra_time = 0.
+
+	for player in players:
+		game_start.connect(player._on_game_start)
+		game_tick.connect(player._on_game_tick)
+
+	for i in range(planets.size()):
+		var planet := planets[i]
+		planet.player = players[i] if i < players.size() else neutral_player
+		planet.is_selected = false
+		game_start.connect(planet._on_game_start)
+		game_tick.connect(planet._on_game_tick)
+
+func _process(delta: float) -> void:
+	extra_time += delta
+	
+	while extra_time > LOGIC_SECONDS_PER_TICK:
+		extra_time -= LOGIC_SECONDS_PER_TICK
+		game_tick.emit(self, ticks_count)
+		ticks_count += 1

icon.svg

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icons/character.svg

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icons/chip.svg

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icons/paw_print.svg

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+ width="1085.000000pt" height="1280.000000pt" viewBox="0 0 1085.000000 1280.000000"
+ preserveAspectRatio="xMidYMid meet">
+<metadata>
+Created by potrace 1.15, written by Peter Selinger 2001-2017
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main.tscn

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+[gd_scene load_steps=11 format=3 uid="uid://cdaf4bh0jaa45"]
+
+[ext_resource type="PackedScene" uid="uid://dq00mi6jwsa1f" path="res://scenes/planet/planet.tscn" id="1_0p552"]
+[ext_resource type="Script" path="res://game_logic/game_logic.gd" id="1_kb05v"]
+[ext_resource type="Script" path="res://scenes/player/player.gd" id="2_plgh6"]
+[ext_resource type="Texture2D" uid="uid://bydmcc5d53ldx" path="res://icons/paw_print.svg" id="3_mxakn"]
+[ext_resource type="Texture2D" uid="uid://1xh0qil16bkh" path="res://icons/character.svg" id="3_qxmev"]
+[ext_resource type="Script" path="res://scenes/player/local_player.gd" id="4_7rlmh"]
+[ext_resource type="Texture2D" uid="uid://dx1wjviioa8u5" path="res://icons/chip.svg" id="4_pgo63"]
+[ext_resource type="Script" path="res://ui.gd" id="7_khbdl"]
+[ext_resource type="PackedScene" uid="uid://cpffyaoh8x5bp" path="res://scenes/ships_fleet/ships_fleet.tscn" id="9_be18b"]
+[ext_resource type="PackedScene" uid="uid://ckfk1xgxfk1c3" path="res://scenes/trail/trail.tscn" id="10_b5ql7"]
+
+[node name="Main" type="Node"]
+
+[node name="Logic" type="Node" parent="." node_paths=PackedStringArray("neutral_player", "players", "planets")]
+script = ExtResource("1_kb05v")
+neutral_player = NodePath("Players/0_Nature")
+players = [NodePath("Players/1_LocalPlayer"), NodePath("Players/2_AI")]
+planets = [NodePath("../Game/Planets/Planet1"), NodePath("../Game/Planets/Planet2"), NodePath("../Game/Planets/Planet3"), NodePath("../Game/Planets/Planet4")]
+
+[node name="Players" type="Node" parent="Logic"]
+
+[node name="0_Nature" type="Node" parent="Logic/Players"]
+script = ExtResource("2_plgh6")
+color = Color(0.745, 0.745, 0.745, 1)
+icon = ExtResource("3_mxakn")
+
+[node name="1_LocalPlayer" type="Node" parent="Logic/Players" node_paths=PackedStringArray("ui")]
+script = ExtResource("4_7rlmh")
+ui = NodePath("../../../UI")
+color = Color(0.184314, 0.329412, 1, 1)
+icon = ExtResource("3_qxmev")
+
+[node name="2_AI" type="Node" parent="Logic/Players"]
+script = ExtResource("2_plgh6")
+color = Color(0.835294, 0.160784, 0, 1)
+icon = ExtResource("4_pgo63")
+
+[node name="Game" type="Node2D" parent="."]
+
+[node name="Planets" type="Node2D" parent="Game"]
+
+[node name="Planet1" parent="Game/Planets" instance=ExtResource("1_0p552")]
+position = Vector2(200, 200)
+
+[node name="Planet2" parent="Game/Planets" instance=ExtResource("1_0p552")]
+position = Vector2(952, 448)
+
+[node name="Planet3" parent="Game/Planets" instance=ExtResource("1_0p552")]
+position = Vector2(450, 234)
+
+[node name="Planet4" parent="Game/Planets" instance=ExtResource("1_0p552")]
+position = Vector2(702, 414)
+
+[node name="ShipsFleet" parent="." instance=ExtResource("9_be18b")]
+position = Vector2(246, 394)
+count = 29
+
+[node name="UI" type="Control" parent="."]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+mouse_filter = 2
+script = ExtResource("7_khbdl")
+
+[node name="Trail" parent="UI" instance=ExtResource("10_b5ql7")]
+position = Vector2(577.094, 325.561)
+rotation = 0.610903
+scale = Vector2(4.53022, 1)
+color = Color(0.184314, 0.329412, 1, 1)

project.godot

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+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="Space Capture"
+run/main_scene="res://main.tscn"
+config/features=PackedStringArray("4.2", "GL Compatibility")
+config/icon="res://icon.svg"
+
+[rendering]
+
+renderer/rendering_method="mobile"
+environment/defaults/default_clear_color=Color(0, 0, 0, 1)

scenes/planet/planet.gd

@@ -0,0 +1,51 @@
+extends Node2D
+class_name Planet
+
+## The player currenly controlling this planet.
+var player: Player :
+	set(value):
+		player = value
+		var color := Color.MAGENTA if player == null else player.color
+		%Selection.color = color
+		%PopulationLabel.modulate = color
+		%PopulationIcon.modulate = color
+		%PopulationIcon.texture = null if player == null else player.icon
+
+## Number of units currently stationed at the planet.
+@export var population: int :
+	set(value):
+		population = value
+		%PopulationLabel.text = "%s" % value
+
+func _ready() -> void:
+	is_selected = false
+
+func _on_game_start(game: GameLogic) -> void:
+	pass
+
+func _on_game_tick(game: GameLogic, tick: int) -> void:
+	if player != game.neutral_player and tick % 10 == 0:
+		population += 1
+
+@export_category("UI")
+
+signal selected(planet: Planet)
+signal pointer_entered(planet: Planet)
+signal pointer_exited(planet: Planet)
+
+var is_selected: bool :
+	get:
+		return %Selection.visible
+	set(value):
+		%Selection.visible = value
+
+func _on_input_listener_input_event(viewport: Node, event: InputEvent, shape_idx: int) -> void:
+	# TODO: handle touch appropriately (InputEventScreenTouch).
+	if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_LEFT and event.is_pressed():
+		selected.emit(self)
+
+func _on_input_listener_mouse_entered() -> void:
+	pointer_entered.emit(self)
+
+func _on_input_listener_mouse_exited() -> void:
+	pointer_exited.emit(self)

scenes/planet/planet.tscn

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+[gd_scene load_steps=7 format=3 uid="uid://dq00mi6jwsa1f"]
+
+[ext_resource type="PackedScene" uid="uid://dnerbdusnaofr" path="res://scenes/procedural_planet/procedural_planet.tscn" id="1_8mf3x"]
+[ext_resource type="Script" path="res://scenes/planet/planet.gd" id="1_e208c"]
+[ext_resource type="Shader" path="res://scenes/planet/planet_selection.gdshader" id="2_bl05u"]
+[ext_resource type="Texture2D" uid="uid://1xh0qil16bkh" path="res://icons/character.svg" id="2_kglxp"]
+
+[sub_resource type="CircleShape2D" id="CircleShape2D_tsywx"]
+radius = 50.0
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_lnvto"]
+shader = ExtResource("2_bl05u")
+shader_parameter/size = 100.0
+
+[node name="Planet" type="Node2D"]
+script = ExtResource("1_e208c")
+
+[node name="InputListener" type="Area2D" parent="."]
+monitoring = false
+monitorable = false
+
+[node name="CollisionShape" type="CollisionShape2D" parent="InputListener"]
+shape = SubResource("CircleShape2D_tsywx")
+
+[node name="Earth" parent="." instance=ExtResource("1_8mf3x")]
+
+[node name="Selection" type="ColorRect" parent="."]
+unique_name_in_owner = true
+visible = false
+material = SubResource("ShaderMaterial_lnvto")
+offset_left = -100.0
+offset_top = -100.0
+offset_right = 100.0
+offset_bottom = 100.0
+mouse_filter = 2
+
+[node name="Population" type="PanelContainer" parent="."]
+anchors_preset = 8
+anchor_left = 0.5
+anchor_top = 0.5
+anchor_right = 0.5
+anchor_bottom = 0.5
+offset_left = -0.5
+offset_top = -11.5
+offset_right = 0.5
+offset_bottom = 11.5
+grow_horizontal = 2
+grow_vertical = 2
+size_flags_horizontal = 4
+size_flags_vertical = 4
+mouse_filter = 2
+
+[node name="PopulationMargin" type="MarginContainer" parent="Population"]
+layout_mode = 2
+mouse_filter = 2
+theme_override_constants/margin_left = 4
+theme_override_constants/margin_right = 2
+
+[node name="PopulationBox" type="HBoxContainer" parent="Population/PopulationMargin"]
+layout_mode = 2
+mouse_filter = 2
+
+[node name="PopulationLabel" type="Label" parent="Population/PopulationMargin/PopulationBox"]
+unique_name_in_owner = true
+layout_mode = 2
+text = "0"
+
+[node name="PopulationIcon" type="TextureRect" parent="Population/PopulationMargin/PopulationBox"]
+unique_name_in_owner = true
+layout_mode = 2
+mouse_filter = 2
+texture = ExtResource("2_kglxp")
+stretch_mode = 3
+
+[connection signal="input_event" from="InputListener" to="." method="_on_input_listener_input_event"]
+[connection signal="mouse_entered" from="InputListener" to="." method="_on_input_listener_mouse_entered"]
+[connection signal="mouse_exited" from="InputListener" to="." method="_on_input_listener_mouse_exited"]
+[connection signal="gui_input" from="Selection" to="." method="_on_selection_gui_input"]

scenes/planet/planet_selection.gdshader

@@ -0,0 +1,18 @@
+shader_type canvas_item;
+
+// Size in pixels.
+uniform float size = 100.;
+
+// Zoom level assuming a planet of normalized size.
+varying float zoom;
+
+void vertex() {
+	zoom = 8. / (size * CANVAS_MATRIX[0][0]);
+}
+
+void fragment() {
+	float r = length(UV - .5) * -8. + 2.;
+	float d = abs(r);
+	
+	COLOR *= vec4(1., 1., 1., smoothstep(zoom, 0., d));
+}

scenes/player/local_player.gd

@@ -0,0 +1,10 @@
+extends Player
+class_name LocalPlayer
+
+@export var ui: GameUI
+
+func _on_game_start(game: GameLogic) -> void:
+	ui._on_game_started(game)
+
+func _on_game_tick(game: GameLogic, tick: int) -> void:
+	pass

scenes/player/player.gd

@@ -0,0 +1,12 @@
+extends Node
+class_name Player
+
+@export var color: Color = Color.MAGENTA
+
+@export var icon: Texture2D
+
+func _on_game_start(game: GameLogic) -> void:
+	pass
+
+func _on_game_tick(game: GameLogic, tick: int) -> void:
+	pass

scenes/procedural_planet/albedo.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dr8pb2ip0k08j"
+path="res://.godot/imported/albedo.png-2491354286e62c1834bccf9d59be1546.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://scenes/procedural_planet/albedo.png"
+dest_files=["res://.godot/imported/albedo.png-2491354286e62c1834bccf9d59be1546.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

scenes/procedural_planet/procedural_planet.gd

@@ -0,0 +1,48 @@
+extends Node2D
+
+@export_group("Planet")
+
+## Size of the planet in pixels.
+@export_range(30, 500, .001, "or_greater", "or_less") var size: float = 100 :
+	set(value):
+		scale = value * Vector2.ONE
+		material.set_shader_parameter('size', value)
+
+# Rotation speed of the planet in rad/sec.
+@export_range(0, 1, .001, "or_greater", "or_less") var rotation_speed: float = 0.05 :
+	set(value):
+		material.set_shader_parameter('rotationSpeed', value)
+
+@export_group("Weather")
+
+# Size of clouds between 0 (no clouds) and 1 (covered in clouds completely).
+@export_range(0, 1, .001) var clouds_size: float = 0.05 :
+	set(value):
+		material.set_shader_parameter('cloudsSize', value)
+
+# Density of clouds between 0 (very thin) and 1 (very thick).
+@export_range(0, 1, .001) var cloud_density: float = 0.22 :
+	set(value):
+		material.set_shader_parameter('cloudsDensity', value)
+
+# How often clouds change shape.
+@export_range(0, 1, .001, "or_greater") var cloud_turbulence: float = 0.01 :
+	set(value):
+		material.set_shader_parameter('cloudsTurbulence', value)
+
+# Wind speed in rad/sec.
+@export_range(0, 1, .001, "or_greater") var wind_speed: float = 0.22 :
+	set(value):
+		material.set_shader_parameter('windSpeed', value)
+
+@export_group("Atmosphere")
+
+## Size of the atmosphere halo around the planet.
+@export_range(0, 1, .001) var atmosphere_size: float = .3 :
+	set(value):
+		material.set_shader_parameter('atmosphereSize', value)
+
+## Color of the atmosphere halo around the planet.
+@export var atmosphere_color: Color = Color(0., .3, 1., .3) :
+	set(value):
+		material.set_shader_parameter('atmosphereColor', value)

scenes/procedural_planet/procedural_planet.gdshader

@@ -0,0 +1,80 @@
+shader_type canvas_item;
+
+// Noise texture.
+uniform sampler3D noise: repeat_enable;
+
+// Planet.
+uniform float size = 100.; // Size in pixels, not including atmosphere.
+uniform float rotationSpeed = 0.05;
+uniform sampler2D albedo; // Left side = water color (deep to shallow), right size = terrain color (low to high).
+
+// Atmosphere.
+uniform vec4 atmosphereColor: source_color = vec4(0., .3, 1., .3);
+uniform float atmosphereSize = .3; // Range: [0, 1]
+
+// Weather.
+uniform float cloudsSize = 0.05;
+uniform float cloudsDensity = 0.22;
+uniform float cloudsTurbulence = 0.01;
+uniform float windSpeed = 0.03;
+
+// Zoom level assuming a planet of normalized size.
+varying float zoom;
+
+void vertex() {
+	zoom = 4. / (size * CANVAS_MATRIX[0][0]);
+}
+
+vec4 blend(vec4 bg, vec4 fg) {
+	float alpha = fg.a + bg.a * (1. - fg.a);
+	vec3 color = (fg.rgb * fg.a + bg.rgb * bg.a * (1. - fg.a)) / alpha;
+	return vec4(color, alpha);
+}
+
+vec4 drawPlanet(float r, vec3 p) {
+	float angle = TIME * rotationSpeed;
+	//mat3 rotX = mat3(vec3(1., 0., 0.), vec3(0., cos(angle), -sin(angle)), vec3(0., sin(angle), cos(angle)));
+	mat3 rotY = mat3(vec3(cos(angle), 0., -sin(angle)), vec3(0., 1., 0.), vec3(sin(angle), 0., cos(angle)));
+	//mat3 rotZ = mat3(vec3(cos(angle), -sin(angle), 0.), vec3(sin(angle), cos(angle), 0.), vec3(0., 0., 1.));
+	
+	float height = texture(noise, p * 0.3 * rotY).r;
+	float rand = texture(noise, p * 0.3 * rotY + vec3(0.1, 0.2, 0.3)).r * .5 + .5;
+	//float rand = texture(noise, p + vec3(n + TIME * 0.02)).r;
+	
+	vec3 color = texture(albedo, vec2(height, ((p.y + rand * sign(p.y)) * .5 + 1.) * .5)).rgb;
+	vec3 lit = max(vec3(0.), color * dot(p, vec3(0., 0., 1.)));
+	
+	return vec4(lit, smoothstep(0., zoom, r));
+}
+
+vec4 drawClouds(float r, vec3 p) {
+	float angle = TIME * 0.08;
+	mat3 rotY = mat3(vec3(cos(angle), 0., -sin(angle)), vec3(0., 1., 0.), vec3(sin(angle), 0., cos(angle)));
+
+	float angle2 = TIME * (rotationSpeed - windSpeed);
+	mat3 rotY2 = mat3(vec3(cos(angle2), 0., -sin(angle2)), vec3(0., 1., 0.), vec3(sin(angle2), 0., cos(angle2)));
+
+	float rand = texture(noise, p * 0.5 * rotY2 + vec3(0., 0., TIME * cloudsTurbulence)).r * .5 + .5;
+	float rand2 = texture(noise, p * 0.8 * rotY2 + vec3(0., 0., rand)).r * .5 + .5;
+	
+	return vec4(vec3(1.), smoothstep(1. - cloudsDensity - cloudsSize, 1. - cloudsSize, rand2) * smoothstep(0., .3, r * 3.));
+}
+
+vec4 drawAtmosphere(float r) {
+	return vec4(atmosphereColor.rgb, smoothstep(1.-atmosphereSize, 1., r + 1.) * atmosphereColor.a);
+}
+
+void fragment() {
+	float r = length(UV - .25) * -8. + 1.;
+	vec2 xy = UV * 8. - 2.;
+	float z = sqrt(1. - xy.x*xy.x - xy.y*xy.y);
+	vec3 p = vec3(xy, z);
+	
+	vec4 atmosphere = drawAtmosphere(r);
+	vec4 planet = drawPlanet(r, p);
+	vec4 clouds = drawClouds(r, p);
+	COLOR = blend(blend(atmosphere, planet), clouds);
+	
+	// DEBUG
+	//COLOR = vec4(p, smoothstep(0., zoom, r));
+}

scenes/procedural_planet/procedural_planet.tscn

@@ -0,0 +1,37 @@
+[gd_scene load_steps=8 format=3 uid="uid://dnerbdusnaofr"]
+
+[ext_resource type="Script" path="res://scenes/procedural_planet/procedural_planet.gd" id="1_2swpa"]
+[ext_resource type="Shader" path="res://scenes/procedural_planet/procedural_planet.gdshader" id="1_tl7a6"]
+[ext_resource type="Texture2D" uid="uid://dr8pb2ip0k08j" path="res://scenes/procedural_planet/albedo.png" id="3_pc1s8"]
+
+[sub_resource type="FastNoiseLite" id="FastNoiseLite_xihql"]
+fractal_octaves = 8
+
+[sub_resource type="NoiseTexture3D" id="NoiseTexture3D_bt5w2"]
+width = 256
+height = 256
+depth = 256
+seamless = true
+noise = SubResource("FastNoiseLite_xihql")
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_m4mhh"]
+shader = ExtResource("1_tl7a6")
+shader_parameter/size = 100.0
+shader_parameter/rotationSpeed = 0.05
+shader_parameter/atmosphereColor = Color(0, 0.3, 1, 0.3)
+shader_parameter/atmosphereSize = 0.3
+shader_parameter/cloudsSize = 0.05
+shader_parameter/cloudsDensity = 0.22
+shader_parameter/cloudsTurbulence = 0.01
+shader_parameter/windSpeed = 0.03
+shader_parameter/noise = SubResource("NoiseTexture3D_bt5w2")
+shader_parameter/albedo = ExtResource("3_pc1s8")
+
+[sub_resource type="PlaceholderTexture2D" id="PlaceholderTexture2D_ipvyw"]
+size = Vector2(2, 2)
+
+[node name="ProceduralPlanet" type="Sprite2D"]
+material = SubResource("ShaderMaterial_m4mhh")
+scale = Vector2(100, 100)
+texture = SubResource("PlaceholderTexture2D_ipvyw")
+script = ExtResource("1_2swpa")

scenes/ships_fleet/fading_trail.gdshader

@@ -0,0 +1,12 @@
+shader_type canvas_item;
+
+float rand(vec2 co){
+    return fract(sin(dot(co, vec2(12.9898, 78.233))) * 43758.5453);
+}
+
+void fragment() {
+	if (rand(SCREEN_UV) > COLOR.a - abs(UV.y * 2. - 1.))
+		discard;
+	
+	COLOR = vec4(1., 1., 1., COLOR.a);
+}

scenes/ships_fleet/ship.tscn

@@ -0,0 +1,22 @@
+[gd_scene load_steps=5 format=3 uid="uid://ctybb4niolni3"]
+
+[ext_resource type="Shader" path="res://scenes/ships_fleet/fading_trail.gdshader" id="1_tajfm"]
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_ys3et"]
+shader = ExtResource("1_tajfm")
+
+[sub_resource type="PlaceholderTexture2D" id="PlaceholderTexture2D_gcgjo"]
+size = Vector2(12, 4)
+
+[sub_resource type="Gradient" id="Gradient_6a1ig"]
+colors = PackedColorArray(1, 1, 1, 1, 1, 1, 1, 0)
+
+[node name="Ship" type="CPUParticles2D"]
+material = SubResource("ShaderMaterial_ys3et")
+amount = 100
+lifetime = 3.0
+lifetime_randomness = 0.3
+texture = SubResource("PlaceholderTexture2D_gcgjo")
+particle_flag_align_y = true
+gravity = Vector2(0, 0)
+color_ramp = SubResource("Gradient_6a1ig")

scenes/ships_fleet/ships_fleet.gd

@@ -0,0 +1,22 @@
+extends Node2D
+
+var instances: Array[Node2D] = []
+
+@export var ship_template: PackedScene
+
+@export var count: int :
+	set(value):
+		count = value
+
+		var diff = count - instances.size()
+
+		for i in range(diff):
+			var j = float(1 + instances.size())
+			var ship := ship_template.instantiate()
+			add_child(ship)
+			ship.position = Vector2.from_angle(j) * j * 2.
+			instances.push_back(ship)
+
+		for i in range(-diff):
+			var ship: Node2D = instances.pop_back()
+			remove_child(ship)

scenes/ships_fleet/ships_fleet.tscn

@@ -0,0 +1,8 @@
+[gd_scene load_steps=3 format=3 uid="uid://cpffyaoh8x5bp"]
+
+[ext_resource type="Script" path="res://scenes/ships_fleet/ships_fleet.gd" id="1_qfy0m"]
+[ext_resource type="PackedScene" uid="uid://ctybb4niolni3" path="res://scenes/ships_fleet/ship.tscn" id="2_6eafk"]
+
+[node name="ShipsFleet" type="Node2D"]
+script = ExtResource("1_qfy0m")
+ship_template = ExtResource("2_6eafk")

scenes/trail/trail.gd

@@ -0,0 +1,5 @@
+extends Sprite2D
+
+@export var color: Color :
+	set(value):
+		material.set_shader_parameter('color', value)

scenes/trail/trail.gdshader

@@ -0,0 +1,16 @@
+shader_type canvas_item;
+
+uniform vec4 color: source_color = vec4(1., 0., 1., 1.);
+
+varying float len;
+
+void vertex() {
+	len = length(MODEL_MATRIX[0]);
+}
+
+void fragment() {
+	float col = texture(TEXTURE, UV * vec2(len, 1.) + vec2(TIME * -.2, 0.)).r;
+	float fade = min(1., min(UV.x, 1. - UV.x) * len);
+	
+	COLOR = color * vec4(vec3(1.), col * fade);
+}

scenes/trail/trail.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://qb1fvyepkup2"
+path="res://.godot/imported/trail.png-d1fbf3ba061e82749354c2b2d8480770.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://scenes/trail/trail.png"
+dest_files=["res://.godot/imported/trail.png-d1fbf3ba061e82749354c2b2d8480770.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

scenes/trail/trail.tscn

@@ -0,0 +1,16 @@
+[gd_scene load_steps=5 format=3 uid="uid://ckfk1xgxfk1c3"]
+
+[ext_resource type="Shader" path="res://scenes/trail/trail.gdshader" id="1_fjdrv"]
+[ext_resource type="Texture2D" uid="uid://qb1fvyepkup2" path="res://scenes/trail/trail.png" id="2_nw1t2"]
+[ext_resource type="Script" path="res://scenes/trail/trail.gd" id="3_cnvkj"]
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_f7lnm"]
+shader = ExtResource("1_fjdrv")
+shader_parameter/color = Color(1, 0, 1, 1)
+
+[node name="Trail" type="Sprite2D"]
+texture_repeat = 2
+material = SubResource("ShaderMaterial_f7lnm")
+scale = Vector2(10, 1)
+texture = ExtResource("2_nw1t2")
+script = ExtResource("3_cnvkj")

ui.gd

@@ -0,0 +1,42 @@
+extends Control
+class_name GameUI
+
+var game: GameLogic
+
+var selected_planet: Planet
+var pointed_planet: Planet
+
+func _on_game_started(game: GameLogic) -> void:
+	self.game = game
+
+	for planet in game.planets:
+		planet.selected.connect(_on_planet_selected)
+		planet.pointer_entered.connect(_on_planet_pointer_entered)
+		planet.pointer_exited.connect(_on_planet_pointer_exited)
+
+func _on_planet_selected(planet: Planet) -> void:
+	if selected_planet != null:
+		selected_planet.is_selected = false
+
+	selected_planet = planet
+	selected_planet.is_selected = true
+
+func _on_planet_pointer_entered(planet: Planet) -> void:
+	pointed_planet = planet
+
+func _on_planet_pointer_exited(planet: Planet) -> void:
+	if pointed_planet == planet:
+		pointed_planet = null
+
+func _unhandled_input(event: InputEvent) -> void:
+	if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_LEFT and event.is_released():
+		if selected_planet != null and pointed_planet != null:
+			var count = ceil(selected_planet.population / 2)
+			selected_planet.population -= count
+			if selected_planet.player == pointed_planet.player:
+				pointed_planet.population += count
+			else:
+				pointed_planet.population -= count
+				if pointed_planet.population <= 0:
+					pointed_planet.player = selected_planet.player
+					pointed_planet.population = abs(pointed_planet.population)