Patch:Orbatrix

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This page covers patches relating to the Orbatrix in Keen 6. Orbatrix are blue, one-eyed floating-bouncing enemies found in many levels.


Sprite Type

Orbatrix use sprite type 16. This is used by no other sprites, nor does it interact with any other sprite types.

Patch: Keen 6
#Orbatrix sprite type
%patch $114F2 $13


Sprite Actions

Orbatrix have several actions and cycles. Sadly little is known about them. The Orbatrix is spawned floating, which is a two frame loop. While floating it can randomly curl up, a three frame sequence that ends with it going to the bounding action, or partially uncurl.

The bouncing loop is four frames long and eventually ends with the Orbatrix uncurling, a six frame loop consisting of two parts. For the first two frames the Orbatrix uncurls, four the next four frames it rises up off the ground (Or wherever it has landed) until it is about level with Keen. It then goes to floating.

When shot the Orbatrix simply floats.

$27E6W  #Orbatrix float 1
$2804W  #Orbatrix float 2
$2822W  #Orbatrix curls 1
$2840W  #Orbatrix curls 2
$285EW  #Orbatrix curls 3
$287CW  #Orbatrix uncurls 1
$289AW  #Orbatrix uncurls 2
$28B8W  #Orbatrix uncurls 3
$28D6W  #Orbatrix uncurls 4
$28F4W  #Orbatrix uncurls 5
$2912W  #Orbatrix uncurls 6
$2930W  #Orbatrix bounding 1
$294EW  #Orbatrix bounding 2
$296CW  #Orbatrix bounding 3
$298AW  #Orbatrix bounding 4

Patch: Keen 6
#When spawned
%patch $11540 $27E6W
#Floating loop
%patch $33532 $2804W %patch $33550 $27E6W
#Partially uncurl (When floating)
%patch $11563 $28B8W
#Curl (When floating)
%patch $1159F $2822W
#Curl sequence
%patch $3356E $2840W %patch $3358C $285EW %patch $335AA $2930W
#Bounce loop
%patch $3367C $294EW %patch $3369A $296CW %patch $336B8 $298AW %patch $336D6 $2930W
#Uncurl (When bouncing)
%patch $11686 $287CW
#Uncurl sequence
%patch $335C8 $289AW %patch $335E6 $28B8W %patch $33604 $28D6W
#Start rising here
%patch $33622 $28F4W %patch $33640 $2912W %patch $3365E $27E6W
#When shot
%patch $115BB $27E6W


Sprite Behavior

The Orbatrix has three unique and one shared behavior. When floating it uses its float behavior which also dictates when it can attack Keen. When curling up it has no behavior until its third action, when it uses its curling behavior. The bouncing Orbatrix uses a generic 'move through the air' behavior also used by other sprites. The first frame of its uncurling sequence has its own behavior while the other five have no behavior.

The curling\uncurling behaviors change the Orbatrix's sprite properties so that it can move between floating and bouncing.

Behaviors:
$08F41765RL #Move through air
$10CC088ERL #Orbatrix float
$10CC09DARL #Orbatrix curl
$10CC0A13RL #Orbatrix uncurl

Patch: Keen 6
#Floating l/r
%patch $33526 $10CC088ERL %patch $33544 $10CC088ERL
#Curling up
%patch $33562 $00000000L %patch $33580 $00000000L %patch $3359E $10CC09DARL
#Uncurling
%patch $335BC $10CC0A13RL %patch $335DA $00000000L %patch $335F8 $00000000L %patch $33616 $00000000L %patch $33634 $00000000L %patch $33652 $00000000L
#Bounding
%patch $33670 $08F41765RL %patch $3368E $08F41765RL %patch $336AC $08F41765RL %patch $336CA $08F41765RL


Orbatrix float behavior

This is the complete behavior code for the Orbatrix floating. On the first line a random check is made which, if passed, makes the Orbatrix go to its third uncurling frame. (This stops it chasing Keen and makes it sit still.)

The second section deals with seeking Keen; first an unknown check is made that may skip the sequence, then Kee's location is checked on the next line, causing the Orbatrix to face him. On the second to last line there are two proximity checks to see if Keen is closer than 5 tiles left or right. If so the Orbatrix will attack via curling, if not it won't. (And will instead just head in his direction.)

Patch: Keen 6
#Orbatrix float behavior
%patch $1154E $55 $8B $EC $56 $57 $8B $76 $06 $9A $1CF30034RL $3D $0020W $7D $09 $C7 $44 $1C $28B8W $5F $5E $5D $CB $8B $44 $28 $8B $1E $64 $A9 $3B $47 $28 $75 $2C $8B $1E $64 $A9 $8B $47 $0A $2B $44 $0A $8B $F8 $0B $FF $7D $05 $B8 $FFFFW $EB $03 $B8 $0001W $89 $44 $0E $81 $FF $FB00W $7E $0B $81 $FF $0500W $7D $05 $C7 $44 $1C $2822W $5F $5E $5D $CB


Seeking Keen

The Orbatrix heads towards Keen when floating, though it does not do so very well.

Patch: Keen 6
#Seek Keen when floating
%patch $11586 $FFFFW %patch $1158B $0001W


Orbatrix doesn't curl or bounce

This patch stops the Orbatrix from curling up and bouncing. This means all it can do is chase Keen and look around. This also stops it getting off of the platforms it is floating above.

Patch: Keen 6
#Orbatrix doesn't curl or bounce
%patch $11590 $5F $5E $5D $CB


Speed and Jump Height

The Orbatrix's floating speed is defined in its animation motion; all other animation speeds are zero. Its bouncing speed however is defined in its own code.

Patch: Animation motion
#Floating
%patch $33522 $0010W $0000W %patch $33540 $0010W $0000W
#Curling
%patch $3355E $0000W $0000W %patch $3357C $0000W $0000W %patch $3359A $0000W $0000W
#Uncurling
%patch $335B8 $0000W $0000W %patch $335D6 $0000W $0000W %patch $335F4 $0000W $0000W %patch $33612 $0000W $0000W %patch $33630 $0000W $0000W %patch $3364E $0000W $0000W
#Bouncing
%patch $3366C $0000W $0000W %patch $3368A $0000W $0000W %patch $336A8 $0000W $0000W %patch $336C6 $0000W $0000W

Patch: Orbatrix bounce variables
#Orbatrix bounces:
%patch $116AB $003CW
#Width
%patch $116B5 $FFE0W
#Height
%patch $116C0 $0005W
#Number of bounces


Sprite Collision

The Orbatrix has two collision values. It will kill Keen if he touches it and is indestructible.


Collision values

The Orbatrix has two collisions, one 'floating' one 'bounding' Both collisions are quite similar, Keen will die if he touches the Orbatrix in any circumstances, however the bounding collision is unique; if Keen shoots the Orbatrix while it uses this then it will uncurl and resume chasing him. This can be used to control where the Orbatrix goes, even trapping it.

Patch: Keen 6 collision values
#Floating
%patch $3352A $10CC08E5RL
#Orbatrix float
%patch $33548 $10CC08E5RL
#Orbatrix float
#Curling up
%patch $33566 $10CC08E5RL
#Orbatrix float
%patch $33584 $10CC08E5RL
#Orbatrix float
%patch $335A2 $10CC08E5RL
#Orbatrix float
#Uncurling
%patch $335C0 $10CC0A41RL
#Orbatrix bouncing
%patch $335DE $10CC0A41RL
#Orbatrix bouncing
%patch $335FC $10CC08E5RL
#Orbatrix float
%patch $3361A $10CC08E5RL
#Orbatrix float
%patch $33638 $10CC08E5RL
#Orbatrix float
%patch $33656 $10CC08E5RL
#Orbatrix float
#Bounding
%patch $33674 $10CC0A41RL
#Orbatrix bouncing
%patch $33692 $10CC0A41RL
#Orbatrix bouncing
%patch $336B0 $10CC0A41RL
#Orbatrix bouncing
%patch $336CE $10CC0A41RL
#Orbatrix bouncing


Floating collision code

This is the complete sprite collision code for the floating Orbatrix . It reacts only to Keen's shot type. This is canned for on the first line. If detected then the 'transform colliding sprite into smashed shot' code is called and the Orbatrix's action changes to that of uncurling.

Patch: Keen 6
#Orbatrix float collision code
%patch $115A5 $55 $8B $EC $56 $8B $76 $08 $83 $3C $03 $75 $18 $56 $9A $0CA60EC2RL $83 $C4 $02 $B8 $28B8W $50 $FF $76 $06 $9A $08F41297RL $83 $C4 $04 $5E $5D $CB


Bouncing collision code

This is the complete sprite collision code for the bouncing Orbatrix . It reacts to Keen's type on line 1, running the 'kill the player' code. On the second line a check for Keen's shot type is made and if found the 'transform colliding sprite into smashed shot' code is called and the Orbatrix's horizontal speed is set to 0.

Patch: Keen 6
#Orbatrix bouncing collision code
%patch $11701 $55 $8B $EC $56 $57 $8B $7E $06 $8B $76 $08 $83 $3C $02 $75 $09 $9A $0AA213CARL $5F $5E $5D $CB $83 $3C $03 $75 $0E $56 $9A $0CA60EC2RL $83 $C4 $02 $C7 $45 $16 $0000W $5F $5E $5D $CB


Animations

The Orbatrix has several animations. Four are used when floating left or right, the animation speed there controls how fast the Orbatrix moves. Three are used when curling up, here the animation speed controls how long the curling sequence takes. Four are used when bouncing, where the animation speed is more trivial. Finally the uncurling sequence uses the remaining frames where the animation speed controls how long this sequence takes.

Patch: Keen 6 Animations
#Cache
%patch $3244C $0149W
#Orbatrix cache start
%patch $3249C $0155W
#Orbatrix cache end
#Floating
%patch $33516 $014DW $014FW
#Orbatrix moving
%patch $33520 $000CW
#Animation speed
%patch $33534 $014EW $0150W
#Orbatrix moving
%patch $3353E $000CW
#Animation speed
#Curling up
%patch $33552 $0149W $0149W
#Orbatrix curls 1
%patch $3355C $000CW
#Animation speed
%patch $33570 $0155W $0155W
#Orbatrix curls 2
%patch $3357A $000CW
#Animation speed
%patch $3358E $0155W $0155W
#Orbatrix curls 3
%patch $33598 $000CW
#Animation speed
#Uncurl
%patch $335AC $0151W $0151W
#Orbatrix uncurls 1
%patch $335B6 $000CW
#Animation speed
%patch $335CA $0155W $0155W
#Orbatrix uncurls 2
%patch $335D4 $000CW
#Animation speed
%patch $335E8 $0149W $0149W
#Orbatrix uncurls 3
%patch $335F2 $000CW
#Animation speed
%patch $33606 $014AW $014AW
#Orbatrix uncurls 4
%patch $33610 $000CW
#Animation speed
%patch $33624 $014BW $014BW
#Orbatrix uncurls 5
%patch $3362E $000CW
#Animation speed
%patch $33642 $014CW $014CW
#Orbatrix uncurls 6
%patch $3364C $000CW
#Animation speed
#Bouncing
%patch $33660 $0154W $0151W
#Orbatrix bounding 1
%patch $3366A $0006W
#Animation speed
%patch $3367E $0153W $0152W
#Orbatrix bounding 2
%patch $33688 $0006W
#Animation speed
%patch $3369C $0152W $0153W
#Orbatrix bounding 3
%patch $336A6 $0006W
#Animation speed
%patch $336BA $0151W $0154W
#Orbatrix bounding 4
%patch $336C4 $0006W
#Animation speed


Sprite positioning and attack range

The Orbatrix spawns 1.5 tiles higher than where placed, allowing it to float above the ground. It will also only attack Keen via bouncing if closer than 5 tiles left or right of him. (See Patch:Jump conditions.)

Patch: Keen 6
#Orbatrix spawn height
%patch $1150E $FE80W
#1.5 tiles up
#Orbatrix attack range
%patch $11592 $FB00W $7E
#Closer than 5 tiles left
%patch $11598 $0500W $7D
#Closer than 5 tiles right


Clipping and foreground

The Orbatrix has a foreground variable of 1, meaning it appears behind foreground tiles, required for consistency when it bounces into things.

Patch: Keen 6
#Orbatrix foreground variable
%patch $114FC $0000W


Probability and randomness

There is a small chance that when floating the Orbatrix will chase Keen or attack him via curling (depending on how close he is.) The higher this probability the more aggressive it will be.

Patch: Keen 6
#Chance of Orbatrix chasing Keen\Curling
%patch $1155C $0020W