Class Enemy

java.lang.Object

core.GameObject

core.Character

entities.enemies.Enemy

All Implemented Interfaces:

Hittable

Direct Known Subclasses:

Boss, Chaser, Jumper

public abstract class Enemy
extends Character
implements Hittable

Abstract base class for all enemy types. Handles health, damage reactions, damage flash, and room reference. Every enemy must implement update and render methods (Some enemies do not use update() but will create its own thread.)

Field Summary

Fields

Modifier and Type	Field	Description
private double	damageFlash	Visual flash effect when the enemy takes damage (0 = none, 1 = full).
protected Room	room	Reference to the room where the enemy exists.

Fields inherited from class core.Character

diameter, isAlive

Fields inherited from class core.GameObject

x, y

Constructor Summary

Constructors

Constructor	Description
Enemy(double x, double y, int hp, int power, Room room, double diameter)	Constructs an Enemy.

Method Summary

Modifier and Type	Method	Description
double	getDamageFlash()	Returns the current damage flash value.
Room	getRoom()	Returns the room this enemy belongs to.
boolean	isAlive()	Checks if the enemy is alive.
boolean	isDead()	Checks whether the enemy is dead.
void	onDead()	Called when the enemy dies.
void	onHit(int damage)	Called when the enemy takes damage.
abstract void	render(javafx.scene.canvas.GraphicsContext gc)	Renders the enemy on the screen.
void	setDamageFlash(double damageFlash)	Sets the damage flash value.
void	setRoom(Room room)	Sets the room this enemy belongs to.
abstract void	update(double dt)	Updates the enemy state each frame.

Methods inherited from class core.Character

getDiameter, getHitbox, getHp, getMaxHp, getPower, setAlive, setDiameter, setHp, setMaxHp, setPower

Methods inherited from class core.GameObject

getX, getY, setX, setY

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface core.Hittable

getDiameter, getHitbox

Field Details

room

protected Room room

Reference to the room where the enemy exists.

damageFlash

private double damageFlash

Visual flash effect when the enemy takes damage (0 = none, 1 = full).

Constructor Details

Enemy

public Enemy(double x,
 double y,
 int hp,
 int power,
 Room room,
 double diameter)

Constructs an Enemy.

Parameters:

x - Initial X position.

y - Initial Y position.

hp - Health points.

power - Attack power.

room - Room where the enemy is located.

diameter - Diameter for hitbox and rendering.

Method Details

isDead

public boolean isDead()

Checks whether the enemy is dead.

Overrides:

isDead in class Character

Returns:

true if dead, false otherwise.

onHit

public void onHit(int damage)

Called when the enemy takes damage. Updates HP and triggers damage flash effect.

Specified by:

onHit in interface Hittable

Parameters:

damage - Amount of damage to apply.

getDamageFlash

public double getDamageFlash()

Returns the current damage flash value.

Returns:

Damage flash (0–1).

setDamageFlash

public void setDamageFlash(double damageFlash)

Sets the damage flash value.

Parameters:

damageFlash - Value to set (0–1).

isAlive

public boolean isAlive()

Checks if the enemy is alive.

Specified by:

isAlive in interface Hittable

Overrides:

isAlive in class Character

Returns:

true if alive, false otherwise.

onDead

public void onDead()

Called when the enemy dies. Default behavior is to spawn a coin at the enemy's location.

Specified by:

onDead in interface Hittable

getRoom

public Room getRoom()

Returns the room this enemy belongs to.

Returns:

Room object.

setRoom

public void setRoom(Room room)

Sets the room this enemy belongs to.

Parameters:

room - Room object.

update

public abstract void update(double dt)

Updates the enemy state each frame.

Specified by:

update in class GameObject

Parameters:

dt - Delta time since last update (seconds).

render

public abstract void render(javafx.scene.canvas.GraphicsContext gc)

Renders the enemy on the screen.

Specified by:

render in class GameObject

Parameters:

gc - GraphicsContext used for rendering.