Chapter 7: Weapons and Projectiles

Technical requirements

Weapons and projectiles in games

The cursor: a pointer that follows the mouse

Screen space versus world space

Defining the Cursor type

Updating the cursor each frame

The timer: a cooldown for the weapon

Implementing the Timer

Driving the weapon cooldown with the timer

Wiring the weapon and pool into the game

The projectile: layers and spawn logic

Spawn position and direction

Rotating the projectile

Collision: a projectile kills an enemy

Why the queue must deduplicate

Walking the queue

The three removal branches

Projectile movement and cleanup

The projectile type and its pool

The bloody knife weapon

Constants and data structures

Running the chapter

Enemy waves: the spawner and the EnemyManager

Spawning off-screen

The enemy node

Wave timing and escalation

Summary