Screensaver: Side Walls

Part of the Nodes and Scenes section of Coddy's Godot journey. Lesson 25 of 27.

When the logo hits the right edge, its x speed must point the other way, from 200 to -200. A minus sign in front of a value flips it:

velocity.x = -velocity.x

At the left edge the same line turns -200 back into 200. Only x flips, so the logo keeps drifting down.

The logo's position is its middle, and the plate is 140 pixels wide. Its right side touches the edge when its middle is at 640 - 70 = 570, and its left side when its middle is at 70.

or joins two conditions. The if runs when either one is true:

if position.y > 300 or position.y < 60:

Challenge

Easy

Make the logo bounce off the left and right edges. When its middle passes x = 570 or x = 70, flip velocity.x. It still drifts off the bottom for now.

Try it yourself

extends Node2D

var velocity = Vector2(200, 90)

func _process(delta):
	position += velocity * delta

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Nodes and Scenes

1Your First Godot Game

What Is Godot?Ready Runs Once Print in Godot The Scene Tree Set a Position Move a Node Once

4Finding Nodes

The Dollar Sign Node Paths Onready Change a Color Hide and Show

2Every Frame

Process Runs Every Frame Delta Pixels per Second Move Diagonally Spin With Rotation Grow With Scale

5Project: Screensaver

Screensaver: DriftScreensaver: Side Walls Project lesson

Screensaver: Top and Bottom

Screensaver: New Colors

3Values You Can Tune

Variables on a Node Constants Export Variables Vector2 Math Wrap Around the Screen Your Own Functions

Practice on your own: Godot playground