init project

.gitignore

@@ -0,0 +1,71 @@
+# Compiled class file
+*.class
+
+# Log file
+*.log
+*.log*
+**/logs/
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+
+# 忽略IntelliJ IDEA生成的项目描述文件
+.idea
+*.iml
+**/target/
+
+# 忽略lucene生成的索引文件
+**/lucene-data/
+
+# 忽略生成的协议文件
+**/jsProtocol/
+**/CsProtocol/
+**/LuaProtocol/
+**/zapp-user/protocol/
+**/protobuf/
+
+# 以下是web前端需要忽略的文件
+# 忽略npm生成的package描述文件
+package-lock.json
+
+
+# 忽略web前端前端package.json，bower.json所有依赖的包
+**/node_modules/
+**/bower_components/
+
+# 忽略npm编译后的文件
+**/dist/
+
+# 忽略webapp中部署的文件
+**/resources/static/
+**/resources/templates/index.html
+
+# test文件
+tests/**/coverage/
+tests/e2e/reports
+
+
+# Godot-specific ignores
+.import/
+export.cfg
+export_presets.cfg
+
+# Mono-specific ignores
+.mono/
+data_*/

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 jaysunxiao
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -1,2 +1,5 @@
 # godot-util
+
 godot engine util and example
+
+关于godot的基本使用示例

default_env.tres

@@ -0,0 +1,7 @@
+[gd_resource type="Environment" load_steps=2 format=2]
+
+[sub_resource type="ProceduralSky" id=1]
+
+[resource]
+background_mode = 2
+background_sky = SubResource( 1 )

doc/demo02_base/base.md

@@ -0,0 +1,17 @@
+- 参考资料
+- [godot官方文档](https://docs.godotengine.org/en/stable/getting_started/scripting/gdscript/gdscript_basics.html)
+- [Godot Tutorials的youtube播放量最高的godot教程视频](https://www.youtube.com/watch?v=JJQa3xrRNM0&list=PLJ690cxlZTgL4i3sjTPRQTyrJ5TTkYJ2_)
+- [B站视频](https://www.bilibili.com/video/BV17g4y1z7uS)
+
+# 数据类型
+![Image text](integer.JPG)
+![Image text](integer_overflow.JPG)
+
+
+
+
+
+
+
+
+

doc/demo02_base/integer.JPG.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/integer.JPG-43a607bfd4c2c4f83e738b20fb6c9816.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo02_base/integer.JPG"
+dest_files=[ "res://.import/integer.JPG-43a607bfd4c2c4f83e738b20fb6c9816.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

doc/demo02_base/integer_overflow.JPG.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/integer_overflow.JPG-08e89d4444868183c3be1155d3451030.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo02_base/integer_overflow.JPG"
+dest_files=[ "res://.import/integer_overflow.JPG-08e89d4444868183c3be1155d3451030.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

doc/demo03_lifecycle/godot_lifecycle.jpg.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/godot_lifecycle.jpg-b26541e87e5327f35f02175dab2eb781.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo03_lifecycle/godot_lifecycle.jpg"
+dest_files=[ "res://.import/godot_lifecycle.jpg-b26541e87e5327f35f02175dab2eb781.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

doc/demo03_lifecycle/godot_node.jpg.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/godot_node.jpg-16331f3f19dfee3528c1c8a0616ee82e.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo03_lifecycle/godot_node.jpg"
+dest_files=[ "res://.import/godot_node.jpg-16331f3f19dfee3528c1c8a0616ee82e.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

doc/demo03_lifecycle/godot_process.jpg.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/godot_process.jpg-0257d8dc365734710f5f2b2802378ee8.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://doc/demo03_lifecycle/godot_process.jpg"
+dest_files=[ "res://.import/godot_process.jpg-0257d8dc365734710f5f2b2802378ee8.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

doc/demo03_lifecycle/lifecycle.md

@@ -0,0 +1,3 @@
+![Image text](./godot_process.jpg)
+![Image text](./godot_node.jpg)
+![Image text](./godot_lifecycle.jpg)

icon.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/icon.png-487276ed1e3a0c39cad0279d744ee560.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.png"
+dest_files=[ "res://.import/icon.png-487276ed1e3a0c39cad0279d744ee560.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

project.godot

@@ -0,0 +1,33 @@
+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=4
+
+_global_script_classes=[ {
+"base": "Reference",
+"class": "MyClass",
+"language": "GDScript",
+"path": "res://script/demo02_base/MyClass.gd"
+} ]
+_global_script_class_icons={
+"MyClass": "res://icon.png"
+}
+
+[application]
+
+config/name="godot-util"
+run/main_scene="res://scene/demo01_hello/HelloWorld.tscn"
+config/icon="res://icon.png"
+
+[physics]
+
+common/enable_pause_aware_picking=true
+
+[rendering]
+
+environment/default_environment="res://default_env.tres"

scene/demo01_hello/HelloWorld.tscn

@@ -0,0 +1,19 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://script/demo01_hello/hello_world.gd" type="Script" id=1]
+
+[node name="Node2D" type="Node2D"]
+script = ExtResource( 1 )
+
+[node name="Label" type="Label" parent="."]
+margin_left = 353.108
+margin_top = 248.378
+margin_right = 589.108
+margin_bottom = 358.378
+text = "Hello World"
+align = 1
+valign = 1
+max_lines_visible = 2
+__meta__ = {
+"_edit_use_anchors_": false
+}

scene/demo02_base/Base.tscn

@@ -0,0 +1,7 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://script/demo02_base/base.gd" type="Script" id=1]
+
+[node name="Node2D" type="Node2D"]
+script = ExtResource( 1 )
+a = 9

scene/demo03_lifecycle/LifeCycle.tscn

@@ -0,0 +1,14 @@
+[gd_scene load_steps=4 format=2]
+
+[ext_resource path="res://script/demo03_lifecycle/sub_node1.gd" type="Script" id=1]
+[ext_resource path="res://script/demo03_lifecycle/sub_node2.gd" type="Script" id=2]
+[ext_resource path="res://script/demo03_lifecycle/parent.gd" type="Script" id=3]
+
+[node name="Node2D" type="Node2D"]
+script = ExtResource( 3 )
+
+[node name="SubNode1" type="Node2D" parent="."]
+script = ExtResource( 1 )
+
+[node name="SubNode2" type="Node" parent="SubNode1"]
+script = ExtResource( 2 )

scene/demo04_signal/Signal.tscn

@@ -0,0 +1,64 @@
+[gd_scene load_steps=5 format=2]
+
+[ext_resource path="res://script/demo04_signal/signal.gd" type="Script" id=1]
+[ext_resource path="res://script/demo04_signal/mySignal.gd" type="Script" id=2]
+[ext_resource path="res://script/demo04_signal/yield.gd" type="Script" id=3]
+[ext_resource path="res://script/demo04_signal/thread.gd" type="Script" id=4]
+
+[node name="Node2D" type="Node2D"]
+script = ExtResource( 1 )
+
+[node name="Button1" type="Button" parent="."]
+margin_left = 322.927
+margin_top = 50.5072
+margin_right = 441.927
+margin_bottom = 90.5072
+text = "button1"
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="Button2" type="Button" parent="."]
+margin_left = 541.436
+margin_top = 44.0454
+margin_right = 661.436
+margin_bottom = 94.0454
+text = "button2"
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="MySignal" type="Button" parent="."]
+margin_left = 323.703
+margin_top = 148.643
+margin_right = 430.703
+margin_bottom = 192.643
+text = "mySignal"
+script = ExtResource( 2 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="Yield" type="Button" parent="."]
+margin_left = 322.941
+margin_top = 244.0
+margin_right = 433.941
+margin_bottom = 287.0
+text = "yield"
+script = ExtResource( 3 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="Thread" type="Button" parent="."]
+margin_left = 321.059
+margin_top = 331.0
+margin_right = 435.059
+margin_bottom = 374.0
+text = "thread"
+script = ExtResource( 4 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[connection signal="pressed" from="Button1" to="." method="_on_Button1_pressed"]

script/demo01_hello/hello_world.gd

@@ -0,0 +1,11 @@
+extends Node2D
+
+
+# Declare member variables here. Examples:
+# var a = 2
+# var b = "text"
+
+
+# Called when the node enters the scene tree for the first time.
+func _ready():
+	print("Hello World")

script/demo02_base/MyClass.gd

@@ -0,0 +1,170 @@
+# extends Node2D
+
+var StringUtils = load("res://util/StringUtils.gd")
+
+# (optional) class definition with a custom icon
+class_name MyClass, "res://icon.png"
+
+
+
+# Member variables
+# gds有5种基础类型，Boolean，Integer(Java long)，Float(Java double)，String，Null
+
+# &&=and  ||=or  !=not
+var a = (true or false) && true
+var b = 9223372036854775807
+var c = 1.5
+var s = "Hello"
+var arr = [1, 2, 3]
+var dict = {
+	2: 3,
+	"key": "字符串作为key",
+	arr: "数组作为key"
+}
+var typed_var: int
+var inferred_type: String = "String"
+
+# Constants
+
+const ANSWER = 42
+const THE_NAME = "Charly"
+
+# Enums
+
+enum {LEFT, RRIGHT, FRONT, BACK}
+# 等价于
+# const LEFT = 0
+# const RIGHT = 1
+# const FRONT = 2
+# const BACK = 3
+enum FOOD {GOOD, NORMAL, BAD = -1}
+
+# Built-in vector types
+
+var v2 = Vector2(1, 2)
+var v3 = Vector3(1, 2, 3)
+
+func _init():
+	pass
+
+static func getAnswer():
+	return ANSWER
+
+func typeInfo():
+	var template = "[Variant:{}] [type:{}] [value:{}]"
+	print(StringUtils.format(template, [TYPE_BOOL, typeof(a), a]))
+	print(StringUtils.format(template, [TYPE_INT, typeof(b), b]))
+	print(StringUtils.format(template, [TYPE_INT, typeof(c), c]))
+	print(StringUtils.format(template, [TYPE_STRING, typeof(s), s]))
+	print(StringUtils.format(template, [TYPE_ARRAY, typeof(arr), arr]))
+	print(StringUtils.format(template, [TYPE_DICTIONARY, typeof(dict), dict]))
+	print(StringUtils.format(template, [TYPE_DICTIONARY, typeof(FOOD), FOOD]))
+	print(StringUtils.format(template, [TYPE_DICTIONARY, typeof(FOOD.GOOD), FOOD.GOOD]))
+	print(self is Reference)
+	print(a is Dog) # 类似于instanceof
+
+func some_function(param1, param2):
+	var local_var = 5
+
+	if param1 < local_var:
+		print(param1)
+	elif param2 > 5:
+		print(param2)
+	else:
+		print("Fail!")
+		
+	match local_var:
+		1:
+			print("match1")
+		2:
+			print("match2")
+		5:
+			print("match5")
+			# continue
+		6:
+			print("match6")
+		_:
+			print("match_")
+
+	for i in range(20):
+		print(i)
+
+	while param2 != 0:
+		param2 -= 1
+
+	var local_var2 = param1 + 3
+	return local_var2
+
+# Function
+func arrayIterator():
+	# range等价于for(int i = 0; i < 20; i++)
+	print("数组遍历方法1：")
+	for i in range(3):
+		print(i)
+	print("数组遍历方法2：")
+	for ele in arr:
+		print(ele)
+	print("数组遍历方法3：")
+	for index in range(arr.size()):
+		print(arr[index])
+
+
+func dictionaryIterator():
+	print("字典遍历方法1：")
+	for key in dict:
+		print("key:" + key as String)
+		print("value:" + dict[key] as String)
+		
+	print("字典遍历方法2：")
+	for key in dict.keys():
+		print("key:" + key as String)
+		print("value:" + dict[key] as String)
+		
+	print("字典遍历方法3：")
+	for value in dict.values():
+		print("value:" + value as String)	
+
+
+
+
+func innerClassTest():
+	var dog = Dog.new(1)
+	dog.move()
+	
+	dog.info()
+	dog.height = 2
+	dog.info()
+
+# Inner class，默认继承Object
+class Animal:
+	extends Object  # 如果不指定继承的类，默认基础Object
+	const STATIC_FIELD = "静态变量"
+	# 属性
+	var height: int
+	
+	func _init():
+		print("Animal 构造方法")
+		
+	func move():
+		print("animal，移动")
+	
+	static func staticFuction():
+		pass
+
+class Dog: 
+	extends Animal
+	
+	# Constructor
+	func _init(height):
+		self.height = height
+		print("Dog 构造方法")
+	
+	# Functions override functions with the same name on the base/parent class.
+	func move():
+		print("dog，用4个脚跑")
+		# If you still want to call them, use '.' (like 'super' in other languages).
+		.move()
+		
+	func info(parm = 100):
+		print("height：" + height as String)
+

script/demo02_base/base.gd

@@ -0,0 +1,59 @@
+extends Node2D
+
+# Declare member variables here. Examples:
+export var a = 1
+export var b:NodePath
+export(NodePath) var c
+export(String, FILE) var e 
+export(String, FILE, "*.txt") var d
+export(Resource) var f
+export(Color, RGB) var g
+var arr = []
+# Called when the node enters the scene tree for the first time.
+func _ready():
+	print("new一个对象--------------------------------")
+	var myClass = MyClass.new()
+	print(myClass.to_string())
+	
+	print("类型信息--------------------------------")
+	myClass.typeInfo()
+	
+	print("基础语法--------------------------------")
+	myClass.some_function(1, 2)
+	
+	print("访问静态变量--------------------------------")
+	var answer = MyClass.ANSWER
+	print("访问const变量，类似于static变量：" + answer as String)
+	
+	print("调用静态方法--------------------------------")
+	print("调用静态方法：" + MyClass.getAnswer() as String)
+	
+	print("数组遍历--------------------------------")	
+	myClass.arrayIterator()
+	print("字典遍历--------------------------------")	
+	myClass.dictionaryIterator()
+
+	print("内部类测试--------------------------------")
+	myClass.innerClassTest()
+
+	print("垃圾回收--------------------------------")
+	# 如果一个类没有指明继承哪个类，则默认继承Reference（可以被自动的垃圾回收，类似其他语言的那种垃圾回收）
+	for i in range(10000):
+		var instance = MyClass.new()
+		arr.append(instance)
+		# instance.unreference()
+		# 立即释放对象
+		# instance.free()
+		# 放在队列里，等系统统一释放对象，推荐
+		# instance.queue_free()
+	print("立即输出数组的第一位内容：")
+	var firstElement = arr[0]
+	print(arr[0])
+
+var frame = 0
+func _process(delta):
+	frame = frame + 1
+	if frame == 300:
+		print("等待一会数组的第一位内容")
+		arr[0].typeInfo()
+		print(typeof(arr[0]))

script/demo03_lifecycle/parent.gd

@@ -0,0 +1,28 @@
+extends Node2D
+
+func _enter_tree():
+	# When the node enters the Scene Tree, it becomes active
+	# and  this function is called. Children nodes have not entered
+	# the active scene yet. In general, it's better to use _ready()
+	# for most cases.
+	print("parent _enter_tree")
+
+func _ready():
+	# This function is called after _enter_tree, but it ensures
+	# that all children nodes have also entered the Scene Tree,
+	# and became active.
+	print("parent _ready")
+
+func _exit_tree():
+	# When the node exits the Scene Tree, this function is called.
+	# Children nodes have all exited the Scene Tree at this point
+	# and all became inactive.
+	print("parent _exit_tree")
+
+func _process(delta):
+	# This function is called every frame.
+	pass
+
+func _physics_process(delta):
+	# This is called every physics frame.
+	pass

script/demo03_lifecycle/sub_node1.gd

@@ -0,0 +1,55 @@
+extends Node2D
+
+
+func _enter_tree():
+	# When the node enters the Scene Tree, it becomes active
+	# and  this function is called. Children nodes have not entered
+	# the active scene yet. In general, it's better to use _ready()
+	# for most cases.
+	print("sub node1 _enter_tree")
+
+func _ready():
+	# This function is called after _enter_tree, but it ensures
+	# that all children nodes have also entered the Scene Tree,
+	# and became active.
+	print("sub node1 _ready")
+	nodeUsage()
+
+func _exit_tree():
+	# When the node exits the Scene Tree, this function is called.
+	# Children nodes have all exited the Scene Tree at this point
+	# and all became inactive.
+	print("sub node1 _exit_tree")
+
+func _process(delta):
+	# This function is called every frame.
+	pass
+
+func _physics_process(delta):
+	# This is called every physics frame.
+	pass
+
+# 申明和存储节点，等价于在_ready()下赋值
+onready var readySubNode = $SubNode2
+
+func nodeUsage():
+	# 获取当前节点
+	var currentNode1 = $"."
+	var currentNode2 = self
+	# 获取父节点
+	var parentNode1 = get_parent()
+	var parentNode2 = $"../"
+	# 获取子节点
+	var subNode1 = $SubNode2
+	var subNode2 = $"SubNode2"
+	var subNode3 = get_node("SubNode2")
+	# 根节点查找法，会返回节点树从上到下找到的第一个节点
+	var subNode4 = get_tree().root.find_node("SubNode2", true, false)
+	print(currentNode1.name)
+	print(currentNode2.name)
+	print(parentNode1.name)
+	print(parentNode2.name)
+	print(subNode1.name)
+	print(subNode2.name)
+	print(subNode3.name)
+	print(subNode4.name)

script/demo03_lifecycle/sub_node2.gd

@@ -0,0 +1,30 @@
+extends Node
+
+
+func _enter_tree():
+	# When the node enters the Scene Tree, it becomes active
+	# and  this function is called. Children nodes have not entered
+	# the active scene yet. In general, it's better to use _ready()
+	# for most cases.
+	print("sub node2 _enter_tree")
+
+func _ready():
+	# This function is called after _enter_tree, but it ensures
+	# that all children nodes have also entered the Scene Tree,
+	# and became active.
+	print("sub node2 _ready")
+
+func _exit_tree():
+	# When the node exits the Scene Tree, this function is called.
+	# Children nodes have all exited the Scene Tree at this point
+	# and all became inactive.
+	print("sub node2 _exit_tree")
+
+func _process(delta):
+	# This function is called every frame.
+	pass
+
+func _physics_process(delta):
+	# This is called every physics frame.
+	pass
+

script/demo04_signal/mySignal.gd

@@ -0,0 +1,22 @@
+extends Button
+
+
+# 自定义信号
+signal mySignal(a, b)
+
+# 发送信号
+# emit_signal("mySignal", 1, 2)
+# disconnect("mySignal", 1, 2)
+
+# 类似于设计模式中的观察者
+func _ready():
+	self.connect("mySignal", self, "onMySingalCallback")
+	self.connect("pressed", self, "onButton")
+
+
+func onMySingalCallback(a, b):
+	print("a:" + a as String)
+	print("b:" + b as String)
+	
+func onButton():
+	emit_signal("mySignal", 1, 2)

script/demo04_signal/signal.gd

@@ -0,0 +1,16 @@
+extends Node2D
+
+
+# 第一种信号接受方法，通过在场景中配置信号的接收方法
+func _on_Button1_pressed():
+	print("hello button1")
+
+
+
+# 第二种信号接受方法，通过代码控制信号的接受，更加的灵活，比较推荐方式
+func _ready():
+	$Button2.connect("pressed", self, "onButton2")
+	
+func onButton2():
+	print("button2 pressed")
+	

script/demo04_signal/thread.gd

@@ -0,0 +1,29 @@
+extends Button
+
+func _ready():
+	self.connect("pressed", self, "onButton2")
+	
+func onButton2():
+	var myThread = Thread.new()
+	
+	print("Create Thread Id: ", myThread)
+	print("Thread Active: ", myThread.is_active())
+	
+	myThread.start(self, "threadTest", null, 0)
+	
+	print()
+	print("Thread Active: ", myThread.is_active())
+	
+	var waitForThread = myThread.wait_to_finish() # wait for our thread to finish before moving on
+	
+	print()
+	print("Thread is Finished with result: ", waitForThread)
+	print("Thread Active: ", myThread.is_active())
+	
+
+
+
+# 使用thread运行的函数必须有一个参数，要不然无法运行
+func threadTest(param):
+	print("thread test start")
+	return 999

script/demo04_signal/yield.gd

@@ -0,0 +1,31 @@
+extends Button
+
+
+func _ready():
+	self.connect("pressed", self, "onButton")
+
+
+# yield(obj, signal)，函数立即返回，并且保存当前执行的位置和状态
+# yield返回GDScriptFunctionState类型对象，类似于Java的CompleteFuture
+# resume恢复GDScriptFunctionState保存的调用函数状态
+func onButton():
+	var yieldResult1 = doSomething1()
+	yieldResult1.resume()
+	
+	var yieldResult2 = doSomething2()
+	# 等待yieldResult2执行完毕
+	yield(yieldResult2, "completed")
+	print("end")
+	
+
+func doSomething1():
+	yield()
+	print("doSomething")
+
+func doSomething2():
+	print(1)
+	yield(get_tree().create_timer(1), "timeout")
+	print(2)
+	yield(get_tree().create_timer(1), "timeout")
+	print(3)
+	yield(get_tree().create_timer(1), "timeout")

util/ArrayUtils.gd

@@ -0,0 +1,5 @@
+extends Object
+
+
+static func isEmpty(array: Array) -> bool:
+	return array == null or array.size() == 0

util/StringUtils.gd

@@ -0,0 +1,29 @@
+extends Object
+
+const ArrayUtils = preload("res://util/ArrayUtils.gd")
+
+const EMPTY: String = ""
+const EMPTY_JSON: String = "{}"
+
+# Checks if a String is empty ("") or null
+static func isEmpty(s: String) -> bool:
+	return s == null or s.length() == 0
+
+
+# 检查是否为空的字符串
+static func isBlank(s: String) -> bool:
+	if isEmpty(s):
+		return true
+	
+	if isEmpty(s.strip_edges(true, true)):
+		return true
+		
+	return false
+
+# 格式化字符串
+static func format(template: String, args: Array) -> String:
+	if isEmpty(template) or ArrayUtils.isEmpty(args):
+		return template
+		
+	return template.format(args, EMPTY_JSON)
+