Add signals demo and starter project

starter-projects/using-signals/CustomSignal.tscn

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+[gd_scene load_steps=5 format=2]
+
+[ext_resource path="res://CustomSignal/Player.tscn" type="PackedScene" id=1]
+[ext_resource path="res://CustomSignal/Enemy.tscn" type="PackedScene" id=2]
+[ext_resource path="res://CustomSignal/LifeBar.tscn" type="PackedScene" id=3]
+[ext_resource path="res://CustomSignal/lifebar_foreground.png" type="Texture" id=4]
+
+[node name="CustomSignal" type="Node2D"]
+
+[node name="Enemy" parent="." instance=ExtResource( 2 )]
+position = Vector2( 570.022, 302.383 )
+
+[node name="Player" parent="." instance=ExtResource( 1 )]
+position = Vector2( 225, 310 )
+
+[node name="LifeBar" parent="." instance=ExtResource( 3 )]
+max_value = 10.0
+value = 10.0
+texture_over = null
+texture_progress = ExtResource( 4 )

starter-projects/using-signals/CustomSignal/Enemy.gd

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+extends Area2D
+
+var angle_increase_speed = PI
+var radius = Vector2(300.0, 150.0)
+
+var angle = 0.0
+
+onready var start_position = position
+onready var previous_position = start_position
+
+
+func _process(delta):
+	angle = wrapf(angle + angle_increase_speed * delta, 0.0, 2 * PI)
+
+	var direction = Vector2(cos(angle), sin(2*angle))
+
+	previous_position = position
+	position = start_position + direction * radius
+	rotation = (position - previous_position).angle()

starter-projects/using-signals/CustomSignal/Enemy.tscn

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+[gd_scene load_steps=4 format=2]
+
+[ext_resource path="res://CustomSignal/topdown-enemy.svg" type="Texture" id=1]
+[ext_resource path="res://CustomSignal/Enemy.gd" type="Script" id=2]
+
+[sub_resource type="CircleShape2D" id=1]
+radius = 27.4179
+
+[node name="Enemy" type="Area2D"]
+position = Vector2( 643.022, 309.383 )
+script = ExtResource( 2 )
+
+[node name="Sprite" type="Sprite" parent="."]
+texture = ExtResource( 1 )
+
+[node name="CollisionPolygon2D" type="CollisionShape2D" parent="."]
+shape = SubResource( 1 )

starter-projects/using-signals/CustomSignal/LifeBar.gd

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+extends TextureProgress

starter-projects/using-signals/CustomSignal/LifeBar.tscn

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+[gd_scene load_steps=4 format=2]
+
+[ext_resource path="res://CustomSignal/lifebar_foreground.png" type="Texture" id=1]
+[ext_resource path="res://CustomSignal/lifebar_background.png" type="Texture" id=2]
+[ext_resource path="res://CustomSignal/LifeBar.gd" type="Script" id=3]
+
+[node name="LifeBar" type="TextureProgress"]
+margin_left = 43.0
+margin_top = 51.0
+margin_right = 235.0
+margin_bottom = 91.0
+texture_under = ExtResource( 2 )
+texture_over = ExtResource( 1 )
+script = ExtResource( 3 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="Label" type="Label" parent="."]
+margin_left = 8.3943
+margin_top = -19.315
+margin_right = 95.3943
+margin_bottom = -5.315
+text = "Player health:"
+__meta__ = {
+"_edit_use_anchors_": false
+}

starter-projects/using-signals/CustomSignal/Player.gd

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+extends Area2D
+
+var health = 10
+
+
+func take_damage(amount):
+	health -= amount
+	if health < 0:
+		health = 0
+
+	get_node("AnimationPlayer").play("take_damage")
+
+
+func _on_area_entered(area):
+	take_damage(2)

starter-projects/using-signals/CustomSignal/Player.tscn

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+[gd_scene load_steps=6 format=2]
+
+[ext_resource path="res://CustomSignal/topdown-player.svg" type="Texture" id=1]
+[ext_resource path="res://CustomSignal/Player.gd" type="Script" id=2]
+
+[sub_resource type="CircleShape2D" id=1]
+radius = 26.0512
+
+[sub_resource type="Animation" id=3]
+resource_name = "setup"
+length = 0.001
+tracks/0/type = "value"
+tracks/0/path = NodePath("Sprite:modulate")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/keys = {
+"times": PoolRealArray( 0 ),
+"transitions": PoolRealArray( 1 ),
+"update": 0,
+"values": [ Color( 1, 1, 1, 1 ) ]
+}
+
+[sub_resource type="Animation" id=2]
+resource_name = "take_damage"
+length = 0.4
+tracks/0/type = "value"
+tracks/0/path = NodePath("Sprite:modulate")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/keys = {
+"times": PoolRealArray( 0, 0.1, 0.2, 0.3, 0.4 ),
+"transitions": PoolRealArray( 1, 1, 1, 1, 1 ),
+"update": 0,
+"values": [ Color( 1, 1, 1, 1 ), Color( 0.952941, 0.32549, 0.32549, 1 ), Color( 1, 1, 1, 1 ), Color( 0.952941, 0.32549, 0.32549, 1 ), Color( 1, 1, 1, 1 ) ]
+}
+
+[node name="Player" type="Area2D"]
+script = ExtResource( 2 )
+
+[node name="Sprite" type="Sprite" parent="."]
+texture = ExtResource( 1 )
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="."]
+shape = SubResource( 1 )
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="."]
+autoplay = "setup"
+anims/setup = SubResource( 3 )
+anims/take_damage = SubResource( 2 )
+
+[connection signal="area_entered" from="." to="." method="_on_area_entered"]

starter-projects/using-signals/CustomSignal/lifebar_background.png.import

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+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/lifebar_background.png-96b0303205556105005ced94d441b1ab.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://CustomSignal/lifebar_background.png"
+dest_files=[ "res://.import/lifebar_background.png-96b0303205556105005ced94d441b1ab.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

starter-projects/using-signals/CustomSignal/lifebar_foreground.png.import

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+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/lifebar_foreground.png-4d9a03410adce54378306a5b29e6e35a.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://CustomSignal/lifebar_foreground.png"
+dest_files=[ "res://.import/lifebar_foreground.png-4d9a03410adce54378306a5b29e6e35a.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

starter-projects/using-signals/CustomSignal/topdown-enemy.svg.import

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+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/topdown-enemy.svg-8388bfbd8771e40eb43b052764eceb0f.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://CustomSignal/topdown-enemy.svg"
+dest_files=[ "res://.import/topdown-enemy.svg-8388bfbd8771e40eb43b052764eceb0f.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0