TowerModel

Base model for tower entities. Manages the visual representation of a tower by composing a base sprite, a rotatable head sprite, and a health bar. The model dynamically swaps its sprites when the tower's tier changes.

TowerModel

Extends ModelEntity.

Properties

Property	Type	Description
name	string	The tower type name (e.g. "ArrowTower"). Used to resolve sprite asset paths.
healthBar	HealthBar	The health bar attachment, sized 82×16 with pivot (41, -25). Hidden by default and shown when the tower is damaged.
base	SpriteEntity	The base sprite for the current tier. Attached at layer 2.
head	SpriteEntity	The head (turret) sprite for the current tier. Attached at layer 3. Rotates to face towerYaw.
currentTier	number	The currently rendered tier. Used to avoid redundant sprite swaps.

Methods

constructor()

function constructor(args: { name: string }): TowerModel

Initializes the tower model. Creates and attaches a HealthBar at layer 4, then calls updateModel(1) to load the tier-1 sprites.

update()

function update(dt: number, user: any): void

Called every frame. Reads tier, towerYaw, health, and maxHealth from the user tick data. Updates the model's tier sprites if the tier has changed, refreshes the health bar visibility, and rotates the head to towerYaw - 90.

updateModel()

function updateModel(tier: number): void

Swaps the base and head sprites to match the given tier (valid range: 1–8). Removes the old base and head attachments, creates new SpriteEntity instances from the resolved asset paths, and re-attaches them at layers 2 and 3 respectively. Throws an error if the tier is out of range.

Asset path format

/asset/image/entity/{name}/{name}-t{tier}-base.svg
/asset/image/entity/{name}/{name}-t{tier}-head.svg

updateHealthBar()

function updateHealthBar(tick: ENTITY_DATA, networkEntity: NetworkEntity): void

Shows the health bar when tick.health !== tick.maxHealth, hides it otherwise.