Zombie: Difference between revisions
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== Differences in hard version ==
=== Major differences ===
* Start targeting at distance of 159 pixels (instead of 64 pixels for normal). They continue targeting while there is a target within 179 pixels (instead of 69 pixels for normal).
* Moves at a speed of 1 px/frame when wandering and following wall (instead of 0.5 px/frame for normal). The speed when targeting is 1 px/frame for both versions.
=== Minor differences ===
[[File:Zombie follow wall comparison.gif|frame|Normal (left) vs. hard (right) targeting through a wall]]
* Position update logic is different when targeting. When targeting through a wall, normal zombies will get stuck, but the hard version will still follow along the wall.
* The angle to rotate when following a wall is stored in a variable instead of being hardcoded. However, this variable is never initialized, so it will retain whatever value happened to be in RAM previously. This generally results in the zombie sticking to the wall instead of following it.
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Zombies have a four frame animation cycle, with 8 frames in between each animation frame. There is a separate set of animation frames for each of the 4 orthogonal directions, chosen based on which direction the zombie is moving. If the zombie is moving diagonal, it uses the left or right animation.
== Bugs ==
* Hard zombies do not generally follow walls like they should. See [[#Differences in hard version|Differences in hard version]].
* The hard zombies have a partially implemented feature that appears to be something that would make them stop targeting for a certain amount of time. In its incomplete state, it generally does not affect their behavior, but if a zombie stays following a wall for around 9 minutes, the timer will underflow. This will cause the zombie to stop targeting for around another 9 minutes until the timer reaches zero again.
== RAM map ==
Line 34 ⟶ 44:
{| class="wikitable"
|-
! Address !! Length !! [[Data types|Type]] !! Name !! Description
|-
| $00 || 2 || int16 || x || X position
|-
| $02 || 2 || int16 || y || Y position
|}
Line 45 ⟶ 55:
{| class="wikitable"
|-
! Address !! Length !! [[Data types|Type]] !! Name !! Description
|-
| $08 || 2 || pointer16 || sprite || Pointer to sprite
|-
| $0A || 2 || uint16 || cyclesUntilAnimUpdate || Number of 2-frame cycles until next animation frame
|-
| $0C || 2 || uint16 x2 || animationFrame || Current animation frame
|-
| $0E || 2 || direction x2 || direction || Current direction
|-
| $10 || 2 || direction x2 || newDirection || New direction
|-
| $12 || 2 || uint16 || deathStatus || Death status. 0 = alive, 0xF5F5 = killed, other = despawned
|-
| $14 || 2 || pointer16 || state || Current state subroutine pointer
|-
| $16 || 2 || int16 || x || X position
|-
| $18 || 2 || int16 || y || Y position
|-
| $1A || 2 || int16 || newX || New X position
|-
| $1C || 2 || int16 || newY || New Y position
|-
| $1E || 2 || int16 0-based || health || Health
|-
| $20 || 2 || direction x4 || targetDirection || Direction to target
|-
| $22 || 2 || sprite type || collidedSpriteType || Type of sprite collided with
|-
| $24 || 2 ||
|-
| $26 || 2 || int16 || tempX || Temp X position (hard only)
|-
| $28 || 2 || int16 || tempY || Temp Y position (hard only)
|-
| $2A || 2 || uint16 || moveCounter || Number of times left to move when targeting (hard only)
|-
| $2C || 2 || int16 || wallRotateAngle || Amount to rotate when following wall (hard only)
|-
| $2E || 2 || pointer16 || targetSprite || Pointer to target sprite (not used) (
|- class="breakrow"
| $7E || 2 ||
|}
== Pseudocode ==
moveAmount_Normal = {
{ 0, 0 },
{ 0, -1 },
{ 1, -1 },
{ 1, 0 },
{ 1, 1 },
{ 0, 1 },
{ -1, 1 },
{ -1, 0 },
{ -1, -1 }
}
moveAmount_Hard = {
{ 0, 0 },
{ 0, -2 },
{ 2, -2 },
{ 2, 0 },
{ 2, 2 },
{ 0, 2 },
{ -2, 2 },
{ -2, 0 },
{ -2, -2 }
}
newPositionIsBlocked() {
return {{ROM name|$80:AE97}}(this.newX, this.newY) ||
{{ROM name|$80:BF67}}(this.sprite, this.newX, this.newY)
}
wanderInRandomDirection_Normal() {
this.direction = ({{ROM name|$80:9D39}}() % 4) * 2 + 1
this.setStateToWandering_Normal()
}
setStateToWandering_Normal() {
this.state = this.wanderingState_Normal
this.wanderingState_Normal()
}
wanderingState_Normal() {
this.newX = this.x + this.moveAmount_Normal[this.direction][0]
this.newY = this.y + this.moveAmount_Normal[this.direction][1]
if (!{{ROM name|$80:AE97}}(this.newX, this.newY)) {
if (!{{ROM name|$80:BF67}}(this.sprite, this.newX, this.newY)) {
this.x = this.newX
this.sprite.x = this.newX
this.y = this.newY
this.sprite.y = this.newY
}
} else {
this.followWall_Normal()
}
}
followWall_Normal() {
this.direction = ((this.direction - 1) + 2) % 8 + 1 // Rotate 90 degrees clockwise
this.setStateToFollowingWall_Normal()
}
setStateToFollowingWall_Normal() {
this.state = this.followingWallState_Normal
}
followingWallState_Normal() {
this.newDirection = ((this.direction - 1) - 2) % 8 + 1 // Rotate 90 degrees counterclockwise
this.newX = this.x + this.moveAmount_Normal[this.newDirection][0]
this.newY = this.y + this.moveAmount_Normal[this.newDirection][1]
if (!this.newPositionIsBlocked()) {
this.direction = this.newDirection
}
this.newX = this.x + this.moveAmount_Normal[this.direction][0]
this.newY = this.y + this.moveAmount_Normal[this.direction][1]
if (!this.newPositionIsBlocked()) {
this.x = this.newX
this.sprite.x = this.newX
this.y = this.newY
this.sprite.y = this.newY
} else {
this.followWall_Normal()
}
}
setStateToTargeting_Normal() {
this.state = this.targetingState_Normal
}
targetingState_Normal() {
distance, this.targetSprite = {{ROM name|$80:B123}}(this.x, this.y)
if (distance >= 70) {
this.wanderInRandomDirection_Normal()
return
}
{{ROM name|$80:B3F1}}(this.sprite, this.targetSprite)
this.direction = {{ROM name|$80:B22A}}(this.sprite, this.targetSprite)
if (this.direction == 0) {
this.wanderInRandomDirection_Normal()
return
}
this.targetDirection = this.direction
for (i = 0; i < 2; i++) {
this.newX = this.x + this.moveAmount_Normal[this.targetDirection][0]
this.newY = this.y + this.moveAmount_Normal[this.targetDirection][1]
if (!this.newPositionIsBlocked()) {
this.x = this.newX
this.sprite.x = this.newX
this.y = this.newY
this.sprite.y = this.newY
}
}
}
checkForTarget_Normal() {
distance = {{ROM name|$80:B123}}(this.x, this.y)
if (distance < 65) {
this.setStateToTargeting_Normal()
return
}
direction = {{ROM name|$80:B2A5}}(208, this.x, this.y)
if (direction == 0) {
this.deathStatus -= 1
}
}
killed() {
{{ROM name|$80:C7D9}}(this.collidedSpriteType & 0x8000, 100)
this.deathStatus = 0xF5F5
}
updateAnimation() {
this.cyclesUntilAnimUpdate -= 1
if (this.cyclesUntilAnimUpdate == 0) {
this.cyclesUntilAnimUpdate = 4
this.animationFrame = (this.animationFrame + 1) % 4
this.sprite.tileData.lowBytes = this.animations[this.direction][this.animationFrame]
this.sprite.tileData.bank = 0x90
if (this.direction < DOWN_LEFT) {
this.sprite.flipX = false
} else {
this.sprite.flipX = true
}
}
}
animations = {
{ 0xCABC, 0xCADD, 0xCAFE, 0xCB1F },
{ 0xCB40, 0xCB61, 0xCB82, 0xCBA3 },
{ 0xCA28, 0xCA51, 0xCA72, 0xCA9B },
{ 0xCA28, 0xCA51, 0xCA72, 0xCA9B },
{ 0xCA28, 0xCA51, 0xCA72, 0xCA9B },
{ 0xCABC, 0xCADD, 0xCAFE, 0xCB1F },
{ 0xCA28, 0xCA51, 0xCA72, 0xCA9B },
{ 0xCA28, 0xCA51, 0xCA72, 0xCA9B },
{ 0xCA28, 0xCA51, 0xCA72, 0xCA9B }
}
init() {
{{ROM name|$81:8000}}()
this.animationFrame = 0
this.x = args.x
this.sprite.x = args.x
this.sprite.z = 0
this.y = args.y
this.sprite.y = args.y
this.sprite.tileData = $90:C98A
this.sprite.visible = true
this.sprite.alternatePalette = 6
this.collidedSpriteType = 0
this.freezeTimer = 0
}
main_Normal() {
{{RAM name|$7E:00DE}} += 0x14
this.cyclesUntilAnimUpdate = 7
this.init()
{{ROM name|$81:832C}}(this.spawnAnimation_Normal)
this.sprite.type = MONSTER
this.wanderInRandomDirection_Normal()
this.health = 0
{{ROM name|$80:8475}}(this.collisionHandler)
this.deathStatus = 0
while (this.deathStatus == 0) {
{{ROM name|$80:8353}}(2)
this.checkForTarget_Normal()
this.state()
this.updateAnimation()
}
if (this.deathStatus == 0xF5F5) {
{{RAM name|$7E:1F64}} += 1
{{ROM name|$81:83A3}}(mummy.deathAnimation, this.deathStatus, 0x90)
}
{{RAM name|$7E:00DE}} -= 0x14
while ({{RAM name|$7E:00DE}} < 0) { }
{{ROM name|$80:BE41}}(this.sprite)
}
spawnAnimation_Normal = {
{ 0xC98A, 10 }, { 0xC993, 10 }, { 0xC9A4, 10 }, { 0xC9B5, 10 },
{ 0xC9D6, 10 }, { 0xC9FF, 10 }, { 0, 0 }
}
collisionHandler(spriteType) {
if (spriteType < SQUIRT_GUN) {
return false
}
this.collidedSpriteType = spriteType
weaponType = spriteType & 0x7FFF
if (weaponType == MARTIAN_BUBBLE_GUN) {
return {{ROM name|$81:83C6}}()
} else if (weaponType == FIRE_EXTINGUISHER) {
return {{ROM name|$81:847E}}()
} else {
newHealth = this.health - {{ROM name|$81:8561}}[weaponType - SQUIRT_GUN]
if (newHealth < 0) {
this.health = newHealth
this.freezeTimer = 0
this.killed()
return true
} else if (newHealth != this.health) {
this.health = newHealth
return {{ROM name|$81:8506}}()
}
return false
}
}
main_Hard() {
{{RAM name|$7E:00DE}} += 0x14
this.cyclesUntilAnimUpdate = 7
this.init()
{{ROM name|$81:832C}}(this.spawnAnimation_Hard)
this.sprite.type = MONSTER
this.wanderInRandomDirection_Hard()
this.health = 0
this.dontTargetTimer = -1
{{ROM name|$80:8475}}(this.collisionHandler)
this.deathStatus = 0
while (this.deathStatus == 0) {
{{ROM name|$80:8353}}(2)
if (this.collidedSpriteType != 0) {
this.sprite.useAlternatePalette = false
this.collidedSpriteType = 0
} else {
this.checkForTarget_Hard()
}
this.state()
this.updateAnimation()
}
if (this.deathStatus == 0xF5F5) {
{{RAM name|$7E:1F64}} += 1
{{ROM name|$81:83A3}}(mummy.deathAnimation, this.deathStatus, 0x90)
}
{{RAM name|$7E:00DE}} -= 0x14
while ({{RAM name|$7E:00DE}} < 0) { }
{{ROM name|$80:BE41}}(this.sprite)
}
spawnAnimation_Hard = {
{ 0xC98A, 10 }, { 0xC993, 10 }, { 0xC9A4, 10 }, { 0xC9B5, 10 },
{ 0xC9D6, 10 }, { 0xC9FF, 10 }, { 0, 0 }
}
// Unused. Exactly equivalent to the other animations table
animations_Hard = {
{ 0xCABC, 0xCADD, 0xCAFE, 0xCB1F },
{ 0xCB40, 0xCB61, 0xCB82, 0xCBA3 },
{ 0xCA28, 0xCA51, 0xCA72, 0xCA9B },
{ 0xCA28, 0xCA51, 0xCA72, 0xCA9B },
{ 0xCA28, 0xCA51, 0xCA72, 0xCA9B },
{ 0xCABC, 0xCADD, 0xCAFE, 0xCB1F },
{ 0xCA28, 0xCA51, 0xCA72, 0xCA9B },
{ 0xCA28, 0xCA51, 0xCA72, 0xCA9B },
{ 0xCA28, 0xCA51, 0xCA72, 0xCA9B }
}
setStateToWandering_Hard() {
this.state = this.wanderingState_Hard
this.wanderingState_Hard()
}
wanderingState_Hard() {
this.newX = this.x + this.moveAmount_Hard[this.direction][0]
this.newY = this.y + this.moveAmount_Hard[this.direction][1]
if (!{{ROM name|$80:AE97}}(this.newX, this.newY)) {
if (!{{ROM name|$80:BF67}}(this.sprite, this.newX, this.newY)) {
this.x = this.newX
this.sprite.x = this.newX
this.y = this.newY
this.sprite.y = this.newY
}
} else {
this.followWall_Hard()
}
}
tryToMoveWhileTargeting() {
this.tempX = this.x
this.tempY = this.y
if (!{{ROM name|$80:AE97}}(this.newX, this.y) &&
!{{ROM name|$80:BF67}}(this.sprite, this.newX, this.y)) {
this.x = this.newX
}
if (!{{ROM name|$80:AE97}}(this.x, this.newY) &&
!{{ROM name|$80:BF67}}(this.sprite, this.x, this.newY)) {
this.y = this.newY
}
if (this.x != this.tempX || this.y != this.tempY) {
this.dontTargetTimer = 0
return false
} else {
return true
}
}
followWall_Hard() {
this.direction = ((this.direction - 1) + this.wallRotateAngle) % 8 + 1
this.setStateToFollowingWall_Hard()
}
wanderInRandomDirection_Hard() {
this.direction = ({{ROM name|$80:9D39}}() % 4) * 2 + 1
this.setStateToWandering_Hard()
}
setStateToFollowingWall_Hard() {
this.state = this.followingWallState_Hard
}
followingWallState_Hard() {
this.dontTargetTimer -= 1
this.newDirection = ((this.direction - 1) - this.wallRotateAngle) % 8 + 1
this.newX = this.x + this.moveAmount_Hard[this.newDirection][0]
this.newY = this.y + this.moveAmount_Hard[this.newDirection][1]
if (!this.newPositionIsBlocked()) {
this.direction = this.newDirection
}
this.newX = this.x + this.moveAmount_Hard[this.direction][0]
this.newY = this.y + this.moveAmount_Hard[this.direction][1]
if (!this.newPositionIsBlocked()) {
this.x = this.newX
this.sprite.x = this.newX
this.y = this.newY
this.sprite.y = this.newY
} else {
this.followWall_Hard()
}
}
unused818ACA() {
this.dontTargetTimer = 0
this.wanderInRandomDirection_Hard()
}
setStateToTargeting_Hard() {
this.state = this.targetingState_Hard
}
targetingState_Hard() {
distance, this.targetSprite = {{ROM name|$80:B123}}(this.x, this.y)
if (distance >= 180) {
this.wanderInRandomDirection_Hard()
return
}
{{ROM name|$80:B3F1}}(this.sprite, this.targetSprite)
this.direction = {{ROM name|$80:B22A}}(this.sprite, this.targetSprite)
if (this.direction == 0) {
this.wanderInRandomDirection_Hard()
return
}
this.targetDirection = this.direction
this.moveCounter = 1
while (this.moveCounter > 0) {
this.newX = this.x + this.moveAmount_Hard[this.targetDirection][0]
this.newY = this.y + this.moveAmount_Hard[this.targetDirection][1]
if (this.tryToMoveWhileTargeting()) {
this.endTargeting()
return
}
this.sprite.x = this.x
this.sprite.y = this.y
this.moveCounter -= 1
}
}
endTargeting() {
this.dontTargetTimer = 0
this.wanderInRandomDirection_Hard()
}
checkForTarget_Hard() {
this.dontTargetTimer -= 1
if (this.dontTargetTimer >= 0) {
return
}
distance = {{ROM name|$80:B123}}(this.x, this.y)
if (distance < 160) {
this.setStateToTargeting_Hard()
return
}
direction = {{ROM name|$80:B2A5}}(208, this.x, this.y)
if (direction == 0) {
this.deathStatus -= 1
}
}
[[Category:Respawning monster]]
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