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Transition animation ScreenTransitionAnimation

Project Structure

Add a scene, the root node is CanvasLayer2D and renamedScreenTransition:

Adding child nodes ColorRect andAnimationPlayer,exist ColorRect Lieutenant Color(Color) is set to black:

turn up Material, New Shader(Don't worry about itShader Param middleWipe Image, which will be added later, here is what it looks like after it is done):

Shader Code

exist Shader Type the code:

shader_type canvas_item;
// 申明 shader 的类型，因为是 2d 游戏，所以是 canvas_item 类型的

uniform sampler2D wipeImage;	// 全局变量 wipeImage
uniform float percent : hint_range(0, 1);	// 限制在 0 和 1 之间的百分比范围

void fragment() {
	float texVal = texture(wipeImage, UV).r;
	// 对图像的 r 通道进行采样
	
	if (texVal < percent) {
		// 在 Animation 中进行动态改变 percent 并且让 百分比不断变大，就可以有一个动态变透明的效果(虽然没有完全弄懂，但大致是这样没错的)
		COLOR.a = 0.0;
	}
}
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AnimationPlayer

First add a script to the root node:

extends CanvasLayer

signal screen_covered

func emit_screen_covered():
	emit_signal("screen_covered")
    // 这个函数用来发送信号

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Then open Animation Player Add todefault Animation:

The first track ColorRect > material:shader gotta beshader In the inspector, click the small key to add animation frames.

ScreenTransitionManager

Create a new scene ScreenTransitionManager And set it as the automatically loaded scene in the project settings, and add a script to the root node:

extends Node

var screenTransitionScene = preload("res://scenes/UI/ScreenTransition.tscn")

func transition_to_scene(scenePath):
	var screenTransition = screenTransitionScene.instance()
	add_child(screenTransition)
	yield(screenTransition, "screen_covered")
	get_tree().change_scene(scenePath)

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Calling Methods

Based on the projectStart MenuFor example, the process of calling a function by clicking the Start menu is as follows:

func on_playButton_pressed():
	$"/root/LevelManager".change_level
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change_level yesLevelManagerIn the function, modify it like this:

func change_level(levelIndex):
	currentLevelIndex = levelIndex
	if (currentLevelIndex >= levelScenes.size()):
		currentLevelIndex = 0
	$"/root/SceenTransitionManager".transition_to_scene(levelScenes[currentLevelIndex].resource_path)	// 获取路径并通过动画过渡脚本来延迟调用场景的切换，达到淡入淡出的效果
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