The main game scene

Now it's time to bring everything we did together into a playable game scene.

Create a new scene and add a Node named Main. (The reason we are using Node instead of Node2D is because this node will be a container for handling game logic. It does not require 2D functionality itself.)

Click the Instance button (represented by a chain link icon) and select your saved player.tscn.

../../_images/instance_scene.webp

Now, add the following nodes as children of Main, and name them as shown (values are in seconds):

  • Timer (named MobTimer) - to control how often mobs spawn

  • Timer (named ScoreTimer) - to increment the score every second

  • Timer (named StartTimer) - to give a delay before starting

  • Marker2D (named StartPosition) - to indicate the player's start position

Set the Wait Time property of each of the Timer nodes as follows:

  • MobTimer: 0.5

  • ScoreTimer: 1

  • StartTimer: 2

In addition, set the One Shot property of StartTimer to "On" and set Position of the StartPosition node to (240, 450).

Spawning mobs

The Main node will be spawning new mobs, and we want them to appear at a random location on the edge of the screen. Add a Path2D node named MobPath as a child of Main. When you select Path2D, you will see some new buttons at the top of the editor:

../../_images/path2d_buttons.webp

Select the middle one ("Add Point") and draw the path by clicking to add the points at the corners shown. To have the points snap to the grid, make sure "Use Grid Snap" and "Use Smart Snap" are both selected. These options can be found to the left of the "Lock" button, appearing as a magnet next to some dots and intersecting lines, respectively.

../../_images/grid_snap_button.webp

Important

Draw the path in clockwise order, or your mobs will spawn pointing outwards instead of inwards!

../../_images/draw_path2d.gif

After placing point 4 in the image, click the "Close Curve" button and your curve will be complete.

Now that the path is defined, add a PathFollow2D node as a child of MobPath and name it MobSpawnLocation. This node will automatically rotate and follow the path as it moves, so we can use it to select a random position and direction along the path.

Your scene should look like this:

../../_images/main_scene_nodes.webp

Main script

Add a script to Main. At the top of the script, we use @export var mob_scene: PackedScene to allow us to choose the Mob scene we want to instance.

extends Node

@export var mob_scene: PackedScene
var score