Avoid scaling prop to 0 in item collection animation

assets/sprites/particles/ball.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dtsdecae83ah3"
+path="res://.godot/imported/ball.png-9141da4d584001e11280d9c246b59589.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/sprites/particles/ball.png"
+dest_files=["res://.godot/imported/ball.png-9141da4d584001e11280d9c246b59589.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

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.ball_particles.emit_spatial(maxi(amount, 1), global_position)

src/items/item/item.tscn

@@ -1,10 +1,11 @@
-[gd_scene load_steps=29 format=3 uid="uid://comd88yp45mnb"]
+[gd_scene load_steps=30 format=3 uid="uid://comd88yp45mnb"]
 
 [ext_resource type="PackedScene" uid="uid://djfbit4v0qncc" path="res://assets/models/items/octahedron.gltf" id="1_a0q17"]
 [ext_resource type="Script" path="res://src/items/item/item.gd" id="1_kesm6"]
 [ext_resource type="Material" uid="uid://c5hidbq5gbmr" path="res://assets/materials/crystal.tres" id="2_dtimm"]
 [ext_resource type="Shader" path="res://src/shaders/spatial_shine.gdshader" id="5_hvjqo"]
 [ext_resource type="Texture2D" uid="uid://du3vk5nnksohs" path="res://assets/sprites/particles/sparkle.png" id="5_k1sdu"]
+[ext_resource type="AudioStream" uid="uid://8uynlpios7u1" path="res://assets/sound/sfx/ui/ecofuture2.wav" id="6_f5kbg"]
 
 [sub_resource type="Animation" id="Animation_7sxyq"]
 length = 0.001
@@ -323,6 +324,51 @@ 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)
+}
+tracks/6/type = "value"
+tracks/6/imported = false
+tracks/6/enabled = true
+tracks/6/path = NodePath("CollectionChime:playing")
+tracks/6/interp = 1
+tracks/6/loop_wrap = true
+tracks/6/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 1,
+"values": [false]
+}
 
 [sub_resource type="Animation" id="Animation_niure"]
 resource_name = "explode"
@@ -377,6 +423,51 @@ 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, 0.001, -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, 0.001, -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, 0.001, -0.25, 0, 0.25, 0),
+"times": PackedFloat32Array(0.0666667, 0.366667)
+}
+tracks/7/type = "value"
+tracks/7/imported = false
+tracks/7/enabled = true
+tracks/7/path = NodePath("CollectionChime:playing")
+tracks/7/interp = 1
+tracks/7/loop_wrap = true
+tracks/7/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 1,
+"values": [true]
+}
 
 [sub_resource type="AnimationLibrary" id="AnimationLibrary_lqra6"]
 _data = {
@@ -445,6 +536,10 @@ libraries = {
 "": SubResource("AnimationLibrary_lqra6")
 }
 
+[node name="CollectionChime" type="AudioStreamPlayer" parent="."]
+stream = ExtResource("6_f5kbg")
+bus = &"SFX"
+
 [connection signal="body_entered" from="Pivot/CollectionArea" to="." method="_on_collection_area_body_entered"]
 
 [editable path="Pivot/Octahedron"]

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/decorations/hud_particles/hud_particles.gd

@@ -0,0 +1,22 @@
+class_name HUDParticles extends GPUParticles2D
+## 2D particle emitter with spatial logic, for emitting particles in the HUD.
+
+
+## Emit the given number of particles in one shot.
+func emit(_amount: int) -> void:
+	amount = _amount
+	emitting = true
+
+
+## Emit the given number of particles from the given screen location.
+func emit_at_location(_amount: int, source_location: Vector2) -> void:
+	var particle_mat: ParticleProcessMaterial = process_material
+	particle_mat.emission_shape_offset = Vector3(source_location.x, source_location.y, 0)
+	emit(_amount)
+
+
+## Emit the given number of particles from the screen location of the given point in 3D space.
+func emit_spatial(_amount: int, source_location: Vector3) -> void:
+	var screen_location := get_viewport().get_camera_3d().unproject_position(source_location)
+	# TODO: what to do if this is outside the viewport?
+	emit_at_location(_amount, screen_location)

src/ui/decorations/hud_particles/hud_particles.tscn

@@ -0,0 +1,50 @@
+[gd_scene load_steps=9 format=3 uid="uid://dfh0bv7lwewj5"]
+
+[ext_resource type="Script" path="res://src/ui/decorations/hud_particles/hud_particles.gd" id="1_leh7k"]
+
+[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
+direction = Vector3(0, 0, 0)
+spread = 180.0
+initial_velocity_min = 400.0
+initial_velocity_max = 600.0
+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_curve = SubResource("CurveTexture_a05qh")
+
+[node name="HUDParticles" type="GPUParticles2D"]
+emitting = false
+amount = 32
+process_material = SubResource("ParticleProcessMaterial_besmx")
+lifetime = 1.4
+one_shot = true
+explosiveness = 0.7
+script = ExtResource("1_leh7k")

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: HUDParticles = %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")
 

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=44 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"]
@@ -12,6 +12,8 @@
 [ext_resource type="FontFile" uid="uid://dsa0oh7c0h4pu" path="res://assets/fonts/Racing_Sans_One/RacingSansOne-Regular.ttf" id="8_bejx4"]
 [ext_resource type="Texture2D" uid="uid://tancoet1lih5" path="res://assets/ui/ball_icons/basic_icon.png" id="8_tt8i3"]
 [ext_resource type="PackedScene" uid="uid://dmciuk3pbjsae" path="res://src/ui/shot_hud/life_bar/life_bar.tscn" id="9_w1fiw"]
+[ext_resource type="PackedScene" uid="uid://dfh0bv7lwewj5" path="res://src/ui/decorations/hud_particles/hud_particles.tscn" id="11_ie5ih"]
+[ext_resource type="Texture2D" uid="uid://dtsdecae83ah3" path="res://assets/sprites/particles/ball.png" id="12_fdbqt"]
 [ext_resource type="PackedScene" uid="uid://b47goj32i6sdh" path="res://src/ui/elements/input_prompt/input_prompt.tscn" id="14_ik4gg"]
 
 [sub_resource type="Animation" id="Animation_2gt87"]
@@ -282,6 +284,23 @@ 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
@@ -303,6 +322,7 @@ tracks/0/keys = {
 _data = {
 "RESET": SubResource("Animation_4h8gq"),
 "hide": SubResource("Animation_w7dmn"),
+"peek": SubResource("Animation_hmxtr"),
 "show": SubResource("Animation_x6kyr")
 }
 
@@ -714,6 +734,20 @@ 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" parent="ClubSelector/TextureRect/BallParticleContainer" instance=ExtResource("11_ie5ih")]
+unique_name_in_owner = true
+texture = ExtResource("12_fdbqt")
+
 [node name="SouthWest" type="MarginContainer" parent="."]
 layout_mode = 1
 anchors_preset = -1