Ball collection particle effect

src/items/extra_ball/extra_ball.gd

@@ -11,3 +11,6 @@ func _collect(player: WorldPlayer) -> void:
 		player.set_balls(ball_type, -1)
 	else:
 		player.mutate_balls(ball_type, amount)
+
+	player.shot_setup.hud.peek_club_selector()
+	player.shot_setup.hud.emit_ball_particles(maxi(amount, 1), screen_location())

src/items/item/item.gd

@@ -10,6 +10,14 @@ signal on_collect(player: WorldPlayer)
 @onready var explosion_player: AnimationPlayer = %ExplosionPlayer
 
 
+## Relative location of this item in screen coordinates.
+## Useful for particle effects
+func screen_location() -> Vector2:
+	var location := get_viewport().get_camera_3d().unproject_position(global_position)
+	# TODO: what if this is off-screen?
+	return location
+
+
 func collect(player: WorldPlayer) -> void:
 	# Note that this animation will call `queue_free` in 5 seconds!
 	explosion_player.play("explode")

src/items/item/item.tscn

@@ -323,6 +323,39 @@ tracks/2/keys = {
 "update": 1,
 "values": [true]
 }
+tracks/3/type = "bezier"
+tracks/3/imported = false
+tracks/3/enabled = true
+tracks/3/path = NodePath("Pivot/Octahedron/ItemMeshContainer:scale:x")
+tracks/3/interp = 1
+tracks/3/loop_wrap = true
+tracks/3/keys = {
+"handle_modes": PackedInt32Array(0),
+"points": PackedFloat32Array(1, -0.25, 0, 0.25, 0),
+"times": PackedFloat32Array(0)
+}
+tracks/4/type = "bezier"
+tracks/4/imported = false
+tracks/4/enabled = true
+tracks/4/path = NodePath("Pivot/Octahedron/ItemMeshContainer:scale:y")
+tracks/4/interp = 1
+tracks/4/loop_wrap = true
+tracks/4/keys = {
+"handle_modes": PackedInt32Array(0),
+"points": PackedFloat32Array(1, -0.25, 0, 0.25, 0),
+"times": PackedFloat32Array(0)
+}
+tracks/5/type = "bezier"
+tracks/5/imported = false
+tracks/5/enabled = true
+tracks/5/path = NodePath("Pivot/Octahedron/ItemMeshContainer:scale:z")
+tracks/5/interp = 1
+tracks/5/loop_wrap = true
+tracks/5/keys = {
+"handle_modes": PackedInt32Array(0),
+"points": PackedFloat32Array(1, -0.25, 0, 0.25, 0),
+"times": PackedFloat32Array(0)
+}
 
 [sub_resource type="Animation" id="Animation_niure"]
 resource_name = "explode"
@@ -377,6 +410,39 @@ tracks/3/keys = {
 "method": &"queue_free"
 }]
 }
+tracks/4/type = "bezier"
+tracks/4/imported = false
+tracks/4/enabled = true
+tracks/4/path = NodePath("Pivot/Octahedron/ItemMeshContainer:scale:x")
+tracks/4/interp = 1
+tracks/4/loop_wrap = true
+tracks/4/keys = {
+"handle_modes": PackedInt32Array(0, 0),
+"points": PackedFloat32Array(1, -0.25, 0, 0.2, 0.8, 0, -0.25, 0, 0.25, 0),
+"times": PackedFloat32Array(0.0333333, 0.333333)
+}
+tracks/5/type = "bezier"
+tracks/5/imported = false
+tracks/5/enabled = true
+tracks/5/path = NodePath("Pivot/Octahedron/ItemMeshContainer:scale:y")
+tracks/5/interp = 1
+tracks/5/loop_wrap = true
+tracks/5/keys = {
+"handle_modes": PackedInt32Array(0, 0),
+"points": PackedFloat32Array(1, -0.25, 0, 0.2, 0.8, 0, -0.25, 0, 0.25, 0),
+"times": PackedFloat32Array(0, 0.3)
+}
+tracks/6/type = "bezier"
+tracks/6/imported = false
+tracks/6/enabled = true
+tracks/6/path = NodePath("Pivot/Octahedron/ItemMeshContainer:scale:z")
+tracks/6/interp = 1
+tracks/6/loop_wrap = true
+tracks/6/keys = {
+"handle_modes": PackedInt32Array(0, 0),
+"points": PackedFloat32Array(1, -0.25, 0, 0.2, 0.8, 0, -0.25, 0, 0.25, 0),
+"times": PackedFloat32Array(0.0666667, 0.366667)
+}
 
 [sub_resource type="AnimationLibrary" id="AnimationLibrary_lqra6"]
 _data = {

src/player/world_player.gd

@@ -30,8 +30,6 @@ signal on_death(player: WorldPlayer)
 	GameBall.Type.PLASMA: -1,
 }
 
-# TODO balls, pickups, etc
-
 var shot_setup: ShotSetup:
 	get:
 		if not shot_setup:

src/ui/shot_hud/shot_hud.gd

@@ -16,6 +16,7 @@ var player: WorldPlayer
 
 @onready var club_selector: ClubSelector = %ClubSelector
 @onready var ball_selector: BallSelector = %BallSelector
+@onready var _ball_particles: GPUParticles2D = %BallParticles
 
 @onready var _curve_animation: AnimationPlayer = %CurveAnimation
 @onready var _power_animation: AnimationPlayer = %PowerAnimation
@@ -57,6 +58,10 @@ func hide_hud() -> void:
 	_sw_animation.play("hide")
 
 
+func peek_club_selector() -> void:
+	_club_selector_animation.play("peek")
+
+
 func peek_life_bar() -> void:
 	_sw_animation.play("peek")
 
@@ -105,6 +110,13 @@ func hide_reset_prompt() -> void:
 	_reset_prompt_animation.play_backwards("show")
 
 
+func emit_ball_particles(amount: int, location: Vector2) -> void:
+	var particle_mat: ParticleProcessMaterial = _ball_particles.process_material
+	particle_mat.emission_shape_offset = Vector3(location.x, location.y, 0)
+	_ball_particles.amount = amount
+	_ball_particles.emitting = true
+
+
 ## Set the value of the life bar, potentially playing some kind of effect in response.
 ##
 ## To set the life bar without triggering an effect, set it directly with `life_bar.value`

src/ui/shot_hud/shot_hud.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=41 format=3 uid="uid://c4ifdiohng830"]
+[gd_scene load_steps=49 format=3 uid="uid://c4ifdiohng830"]
 
 [ext_resource type="Script" path="res://src/ui/shot_hud/shot_hud.gd" id="1_x5b4c"]
 [ext_resource type="Shader" path="res://src/shaders/canvas_retro.gdshader" id="1_ybxxp"]
@@ -282,6 +282,23 @@ tracks/0/keys = {
 "values": [0.0, 0.0872665, -1.5708]
 }
 
+[sub_resource type="Animation" id="Animation_hmxtr"]
+resource_name = "peek"
+length = 2.4
+step = 0.02
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath(".:rotation")
+tracks/0/interp = 3
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0, 0.14, 0.2, 2.2, 2.26, 2.4),
+"transitions": PackedFloat32Array(1.618, 1.618, 1, 1, 1.618, 1.618),
+"update": 0,
+"values": [-1.5708, 0.0872665, 0.0, 0.0, 0.0872665, -1.5708]
+}
+
 [sub_resource type="Animation" id="Animation_x6kyr"]
 resource_name = "show"
 length = 0.4
@@ -303,9 +320,55 @@ tracks/0/keys = {
 _data = {
 "RESET": SubResource("Animation_4h8gq"),
 "hide": SubResource("Animation_w7dmn"),
+"peek": SubResource("Animation_hmxtr"),
 "show": SubResource("Animation_x6kyr")
 }
 
+[sub_resource type="Curve" id="Curve_mp3bg"]
+max_value = 100.0
+_data = [Vector2(0.0431211, 0), 0.0, 21.2919, 0, 0, Vector2(1, 100), 336.968, 0.0, 0, 0]
+point_count = 2
+
+[sub_resource type="CurveTexture" id="CurveTexture_satut"]
+curve = SubResource("Curve_mp3bg")
+
+[sub_resource type="Curve" id="Curve_a5ydw"]
+max_value = 200.0
+_data = [Vector2(0, 9.02831), 0.0, 0.618766, 0, 0, Vector2(1, 200), 450.985, 0.0, 0, 0]
+point_count = 2
+
+[sub_resource type="CurveTexture" id="CurveTexture_oynpa"]
+curve = SubResource("Curve_a5ydw")
+
+[sub_resource type="Curve" id="Curve_53gso"]
+_data = [Vector2(0, 0), 0.0, 0.0, 0, 0, Vector2(0.0616016, 1), 0.0, 0.0, 0, 0, Vector2(0.761807, 1), 0.0, 0.0, 0, 0, Vector2(1, 0), 0.0, 0.0, 0, 0]
+point_count = 4
+
+[sub_resource type="CurveTexture" id="CurveTexture_a05qh"]
+curve = SubResource("Curve_53gso")
+
+[sub_resource type="ParticleProcessMaterial" id="ParticleProcessMaterial_besmx"]
+particle_flag_disable_z = true
+emission_shape_offset = Vector3(800, 600, 0)
+angle_min = -720.0
+angle_max = 720.0
+direction = Vector3(0, 0, 0)
+spread = 180.0
+initial_velocity_min = 400.0
+initial_velocity_max = 600.0
+angular_velocity_min = -100.0
+angular_velocity_max = 100.0
+gravity = Vector3(0, 0, 0)
+radial_accel_min = -100.0
+radial_accel_max = -100.0
+radial_accel_curve = SubResource("CurveTexture_oynpa")
+damping_min = 200.0
+damping_max = 200.0
+damping_curve = SubResource("CurveTexture_satut")
+scale_min = 0.4
+scale_max = 0.4
+scale_curve = SubResource("CurveTexture_a05qh")
+
 [sub_resource type="Animation" id="Animation_3cn2c"]
 resource_name = "RESET"
 length = 0.001
@@ -714,6 +777,26 @@ anchor_right = 0.7
 offset_right = 108.0
 grow_horizontal = 1
 
+[node name="BallParticleContainer" type="Control" parent="ClubSelector/TextureRect"]
+layout_mode = 1
+anchors_preset = 8
+anchor_left = 0.5
+anchor_top = 0.5
+anchor_right = 0.5
+anchor_bottom = 0.5
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="BallParticles" type="GPUParticles2D" parent="ClubSelector/TextureRect/BallParticleContainer"]
+unique_name_in_owner = true
+emitting = false
+amount = 32
+process_material = SubResource("ParticleProcessMaterial_besmx")
+texture = ExtResource("8_tt8i3")
+lifetime = 1.4
+one_shot = true
+explosiveness = 0.7
+
 [node name="SouthWest" type="MarginContainer" parent="."]
 layout_mode = 1
 anchors_preset = -1