Added player health and health bar

game/hud/health_bar.gd

@@ -0,0 +1,71 @@
+class_name HealthBar
+extends Node2D
+
+const ANIMATION_ALERT = "alert"
+
+const SHADER_MAX_VALUE = "shader_parameter/max_value"
+const SHADER_CURRENT_VALUE = "shader_parameter/current_value"
+const SHADER_OLD_VALUE = "shader_parameter/old_value"
+
+
+const OLD_VALUE_DECRETION_RATE = 25.0
+
+
+var _max_value := 0.0:
+	set(value):
+		_max_value = value
+		if is_node_ready():
+			health_sprite.material.set(SHADER_MAX_VALUE, _max_value)
+
+var _current_value := 0.0:
+	set(value):
+		_current_value = value
+		if is_node_ready():
+			health_sprite.material.set(SHADER_CURRENT_VALUE, _current_value)
+
+var _old_value := 0.0:
+	set(value):
+		_old_value = value
+		if is_node_ready():
+			health_sprite.material.set(SHADER_OLD_VALUE, _old_value)
+
+var _old_value_tween : Tween
+
+var _is_animation_needed := false
+
+
+@onready var background_sprite : Sprite2D = $BackgroundSprite
+@onready var alert_sprite : Sprite2D = $AlertSprite
+@onready var health_sprite : Sprite2D = $HealthSprite
+
+@onready var animation_player : AnimationPlayer = $AnimationPlayer
+
+
+func _ready() -> void:
+	alert_sprite.hide()
+
+
+func _process(_delta: float) -> void:
+	if _is_animation_needed and not animation_player.is_playing():
+		animation_player.play(ANIMATION_ALERT)
+		_is_animation_needed = false
+
+
+func initialize(max_value: float, value: float) -> void:
+	_max_value = max_value
+	_current_value = value
+	_old_value = value
+
+
+func set_current_value(value: float) -> void:
+	if value < _current_value:
+		_is_animation_needed = true
+	
+	_current_value = value
+	var time := (_old_value - _current_value)/OLD_VALUE_DECRETION_RATE
+	
+	if _old_value_tween and _old_value_tween.is_running():
+		_old_value_tween.kill()
+	
+	_old_value_tween = create_tween()
+	_old_value_tween.tween_property(self, "_old_value", _current_value, abs(time))

game/hud/health_bar.gd.uid

@@ -0,0 +1 @@
+uid://nkpolcm0u4dw

game/hud/health_bar.tscn

@@ -0,0 +1,79 @@
+[gd_scene format=3 uid="uid://b1x0tmnf7hx7h"]
+
+[ext_resource type="Script" uid="uid://nkpolcm0u4dw" path="res://game/hud/health_bar.gd" id="1_2bnd8"]
+[ext_resource type="Texture2D" uid="uid://bud580fp54qdi" path="res://images/hud/health_bar.png" id="2_hc5qd"]
+[ext_resource type="Shader" uid="uid://cdo2tw14pkf6n" path="res://game/shaders/health_bar.gdshader" id="3_vrpsd"]
+
+[sub_resource type="AtlasTexture" id="AtlasTexture_2bnd8"]
+atlas = ExtResource("2_hc5qd")
+region = Rect2(0, 16, 80, 16)
+
+[sub_resource type="AtlasTexture" id="AtlasTexture_hc5qd"]
+atlas = ExtResource("2_hc5qd")
+region = Rect2(0, 0, 80, 16)
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_hc5qd"]
+shader = ExtResource("3_vrpsd")
+shader_parameter/max_value = 0.0
+shader_parameter/current_value = 0.0
+shader_parameter/old_value = 0.0
+shader_parameter/health_color = Color(0.36862746, 0.99215686, 0.5529412, 1)
+shader_parameter/depletion_color = Color(0.32941177, 0.6509804, 0.41568628, 1)
+shader_parameter/restoration_color = Color(1, 1, 1, 1)
+shader_parameter/background_color = Color(0, 0, 0, 0)
+
+[sub_resource type="AtlasTexture" id="AtlasTexture_vrpsd"]
+atlas = ExtResource("2_hc5qd")
+region = Rect2(2, 32, 76, 16)
+
+[sub_resource type="Animation" id="Animation_hc5qd"]
+length = 0.001
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("AlertSprite:visible")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 1,
+"values": [true]
+}
+
+[sub_resource type="Animation" id="Animation_vrpsd"]
+resource_name = "alert"
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("AlertSprite:visible")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0, 0.1, 0.2, 0.3, 0.4, 0.5),
+"transitions": PackedFloat32Array(1, 1, 1, 1, 1, 1),
+"update": 1,
+"values": [true, false, true, false, true, false]
+}
+
+[sub_resource type="AnimationLibrary" id="AnimationLibrary_5m3x1"]
+_data = {
+&"RESET": SubResource("Animation_hc5qd"),
+&"alert": SubResource("Animation_vrpsd")
+}
+
+[node name="HealthBar" type="Node2D" unique_id=256637218]
+script = ExtResource("1_2bnd8")
+
+[node name="BackgroundSprite" type="Sprite2D" parent="." unique_id=92025763]
+texture = SubResource("AtlasTexture_2bnd8")
+
+[node name="AlertSprite" type="Sprite2D" parent="." unique_id=434583744]
+texture = SubResource("AtlasTexture_hc5qd")
+
+[node name="HealthSprite" type="Sprite2D" parent="." unique_id=1962337283]
+material = SubResource("ShaderMaterial_hc5qd")
+texture = SubResource("AtlasTexture_vrpsd")
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="." unique_id=1840862293]
+libraries/ = SubResource("AnimationLibrary_5m3x1")