hit component

objects/enemy.tscn

@@ -1,5 +1,6 @@
-[gd_scene load_steps=10 format=3 uid="uid://bwdlmualj6xbw"]
+[gd_scene load_steps=13 format=3 uid="uid://bwdlmualj6xbw"]
 
+[ext_resource type="Shader" uid="uid://bs4xvm4qkurpr" path="res://shaders/hit_flash.tres" id="1_ep4yr"]
 [ext_resource type="Texture2D" uid="uid://xes6mt2dd5gu" path="res://sprites/robot_cutout.png" id="1_uh38l"]
 [ext_resource type="Script" path="res://scripts/components/health.gd" id="2_o170m"]
 [ext_resource type="Script" path="res://scripts/components/damage.gd" id="3_8jl3u"]
@@ -7,10 +8,16 @@
 [ext_resource type="Script" path="res://scripts/components/periodic_shooting.gd" id="5_m03v0"]
 [ext_resource type="Script" path="res://scripts/components/enemy_death.gd" id="6_6p3gr"]
 [ext_resource type="Script" path="res://scripts/components/flashing_component.gd" id="7_xsaiy"]
+[ext_resource type="Script" path="res://scripts/components/hit_component.gd" id="9_0qjr4"]
 
 [sub_resource type="RectangleShape2D" id="RectangleShape2D_pwwji"]
 size = Vector2(18, 27)
 
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_j18j0"]
+shader = ExtResource("1_ep4yr")
+shader_parameter/enabled = false
+shader_parameter/tint = Color(1, 1, 1, 1)
+
 [sub_resource type="RectangleShape2D" id="RectangleShape2D_ejbqt"]
 size = Vector2(18, 27)
 
@@ -22,6 +29,7 @@ position = Vector2(0, 0.5)
 shape = SubResource("RectangleShape2D_pwwji")
 
 [node name="Sprite2D" type="Sprite2D" parent="."]
+material = SubResource("ShaderMaterial_j18j0")
 texture = ExtResource("1_uh38l")
 
 [node name="HealthComponent" type="Node" parent="."]
@@ -41,6 +49,7 @@ left_ray = NodePath("../Left Ray")
 right_ray = NodePath("../Right Ray")
 
 [node name="PeriodicShootingComponent" type="Node" parent="." node_paths=PackedStringArray("side_to_side_movement", "root")]
+process_mode = 3
 script = ExtResource("5_m03v0")
 side_to_side_movement = NodePath("../SideToSideMovement")
 root = NodePath("..")
@@ -68,6 +77,12 @@ position = Vector2(-16, 13)
 position = Vector2(16, 13)
 
 [node name="FlashingComponent" type="Node" parent="." node_paths=PackedStringArray("sprite", "health_component")]
+process_mode = 3
 script = ExtResource("7_xsaiy")
 sprite = NodePath("../Sprite2D")
 health_component = NodePath("../HealthComponent")
+
+[node name="HitComponent" type="Node" parent="." node_paths=PackedStringArray("sprite", "health_component")]
+script = ExtResource("9_0qjr4")
+sprite = NodePath("../Sprite2D")
+health_component = NodePath("../HealthComponent")

scripts/components/hit_component.gd

@@ -0,0 +1,33 @@
+class_name HitComponent
+extends Node
+
+@export var sprite: Sprite2D
+@export var health_component: HealthComponent
+@export var hit_duration: float = 0.1
+
+
+func _ready() -> void:
+	if health_component:
+		health_component.on_health_change.connect(on_health_change)
+
+	if not sprite:
+		printerr("No sprite assigned!")
+		return
+
+	if sprite.material:
+		sprite.material = sprite.material.duplicate()
+
+
+func activate() -> void:
+	sprite.material.set_shader_parameter("enabled", true)
+
+
+func deactivate() -> void:
+	sprite.material.set_shader_parameter("enabled", false)
+
+
+func on_health_change(delta: float, _total_health: float) -> void:
+	if delta < 0:
+		activate()
+		await get_tree().create_timer(hit_duration).timeout
+		deactivate()

shaders/hit_flash.tres

@@ -0,0 +1,75 @@
+[gd_resource type="VisualShader" load_steps=5 format=3 uid="uid://bs4xvm4qkurpr"]
+
+[sub_resource type="VisualShaderNodeColorParameter" id="VisualShaderNodeColorParameter_m0j3m"]
+parameter_name = "tint"
+default_value_enabled = true
+
+[sub_resource type="VisualShaderNodeBooleanParameter" id="VisualShaderNodeBooleanParameter_wd72c"]
+parameter_name = "enabled"
+default_value_enabled = true
+
+[sub_resource type="VisualShaderNodeIf" id="VisualShaderNodeIf_i6y1w"]
+default_input_values = [0, 0.0, 1, 1.0, 2, 1e-05, 3, Vector3(0, 0, 0), 4, Vector3(0, 0, 0), 5, Vector3(0, 0, 0)]
+
+[sub_resource type="VisualShaderNodeInput" id="VisualShaderNodeInput_752me"]
+input_name = "color"
+
+[resource]
+code = "shader_type canvas_item;
+render_mode blend_mix;
+
+uniform bool enabled = false;
+uniform vec4 tint : source_color = vec4(1.000000, 1.000000, 1.000000, 1.000000);
+
+
+
+void fragment() {
+// BooleanParameter:3
+	bool n_out3p0 = enabled;
+
+
+// ColorParameter:2
+	vec4 n_out2p0 = tint;
+
+
+// Input:5
+	vec4 n_out5p0 = COLOR;
+
+
+	vec3 n_out4p0;
+// If:4
+	float n_in4p1 = 1.00000;
+	float n_in4p2 = 0.00001;
+	if(abs((n_out3p0 ? 1.0 : 0.0) - n_in4p1) < n_in4p2)
+	{
+		n_out4p0 = vec3(n_out2p0.xyz);
+	}
+	else if((n_out3p0 ? 1.0 : 0.0) < n_in4p1)
+	{
+		n_out4p0 = vec3(n_out5p0.xyz);
+	}
+	else
+	{
+		n_out4p0 = vec3(n_out5p0.xyz);
+	}
+
+
+// Output:0
+	COLOR.rgb = n_out4p0;
+
+
+}
+"
+graph_offset = Vector2(1.80557, 412.047)
+mode = 1
+flags/light_only = false
+nodes/fragment/0/position = Vector2(740, 560)
+nodes/fragment/2/node = SubResource("VisualShaderNodeColorParameter_m0j3m")
+nodes/fragment/2/position = Vector2(80, 260)
+nodes/fragment/3/node = SubResource("VisualShaderNodeBooleanParameter_wd72c")
+nodes/fragment/3/position = Vector2(80, 560)
+nodes/fragment/4/node = SubResource("VisualShaderNodeIf_i6y1w")
+nodes/fragment/4/position = Vector2(480, 560)
+nodes/fragment/5/node = SubResource("VisualShaderNodeInput_752me")
+nodes/fragment/5/position = Vector2(80, 840)
+nodes/fragment/connections = PackedInt32Array(3, 0, 4, 0, 2, 0, 4, 3, 4, 0, 0, 0, 5, 0, 4, 4, 5, 0, 4, 5)