Fire

Monster data
HP	6
Points	0

Entity data
Entity pointer	$82:F25D

Fire is a one-shot monster.

Behavior

Fire does not move, and thus only damages players who walk into it. It starts with 6 HP and takes one damage from each of fire extinguisher, pop cans, and squirt gun. Ironically, it also takes damage from flamethrower, since it shares the same sprite type as pop cans. It will also take damage from the unused sprite type 0x65. If the fire goes off screen, then the entity is deleted and will be created again when it comes back on screen. This will reset the fire's HP since the entity is recreated.

Fire has 4 different animation frames, and there are 6 frames between each one. During the first animation frame of each cycle, the fire is set to sprite type 2, which will allow the player to walk through it and not be damaged. The rest of the time, it is set to sprite type 3.

RAM map

Entity arguments

Address	Length	Type	Name	Description
$00	2	int16	x	X position
$02	2	int16	y	Y position
$04	2	uint16	extra	Extra data (unused)
$06	2	uint16	index	Victim/one-shot monster index

Entity memory

Address	Length	Type	Name	Description
$08	2	pointer16	sprite	Pointer to sprite
$0A	2	uint16	animationFrame	Current animation frame
$0C	2	int16 0-based	cyclesUntilAnimUpdate	Number of 2 frame cycles until next animation frame
$0E	2	unused		Unused
$10	2	int16 0-based	health	Health
$12	2	int16	x	X position
$14	2	int16	y	Y position
$16	2	sprite type	collidedSpriteType	Type of sprite collided with

Pseudocode

main() {
	$7E:00DE += 8
	this.init()
	this.health = 5
	setCollisionHandler(this.collisionHandler)

	while (this.collidedSpriteType == 0 or (this.collidedSpriteType != OFF_SCREEN and this.health >= 0)) {
		this.collidedSpriteType = 0
		waitFrames(2)

		this.cyclesUntilAnimUpdate -= 1
		if (this.cyclesUntilAnimUpdate < 0) {
			this.cyclesUntilAnimUpdate = 2
			this.animationFrame = (animationFrame + 1) % 4

			this.sprite.tileData.lowBytes = this.animation[this.animationFrame]
			this.sprite.tileData.bank = 0x8F
			this.sprite.type = this.spriteTypes[this.animationFrame % 4]
		}
	}

	if (this.collidedSpriteType != OFF_SCREEN && args.index != 0) {
		removeOneShotEntity(args.index)
	}
	$7E:00DE -= 8
	while ($7E:00DE < 0) { }
	deleteSprite(this.sprite)
}

animation = { 0xD526, 0xD537, 0xD548, 0xD559 }
spriteTypes = { NO_DAMAGE_MONSTER, MONSTER, MONSTER, MONSTER }

init() {
	this.sprite = createSprite()
	this.sprite.x = args.x
	this.x = args.x
	this.sprite.z = 0
	this.sprite.y = args.y
	this.y = args.y
	this.sprite.tileData = $8F:D526
	this.sprite.entity = currentEntity
	this.sprite.type = MONSTER
	this.sprite.visible = true

	this.animationFrame = 0
	this.collidedSpriteType = 0
	this.cyclesUntilAnimUpdate = 2
}

collisionHandler(spriteType) {
	this.collidedSpriteType = spriteType

	weaponType = spriteType & 0x7FFF
	if (weaponType == FIRE_EXTINGUISHER or
	    weaponType == SODA_POP_CANS or
	    weaponType == SQUIRT_GUN or
	    weaponType == 0x65) {
		this.health -= 1
		return true
	}
	if (weaponType == OFF_SCREEN) {
		return true
	}
	return false
}