TheRetroBro
Active member
Looking to implement directional shooting in my next game. Preferably much like contra shooting up down and diagonal i cannot seem to find anything in the forums. Does anyone know of this being discussed?
Shooting up and diagonal 4.5.9
- Thread starter TheRetroBro
- Start date
smilehero65
Active member
I may point you into this one...
Try to make your Player:
#FACE_UPRIGHT,
#FACE_UPLEFT,
#FACE_DOWNLEFT,
#FACE_DOWNRIGHT
Maybe the way you could achieve that is to execute an input script that changes into any of those directions when pressing up and right (for example - this is just thinking like Contra)
The standard shooting projectile script from the inputs will shoot a projectile in that direction without further modification!
RustyRetroEntertainmentSy
Member
I recently created a shoot in 4 different directions inputscript depending on up/down beeing pressed
Sharing the code down below.
It does not have diagonal shooting. But perhaps you can modify it for more directions.
Its from my byteoff project, so i erased the doublejump function from it. So this should work just creating the projectile.
It might be better ways of doing this, but i had a lot of romspace and not so much time so this is how i solved the problem:
Sharing the code down below.
It does not have diagonal shooting. But perhaps you can modify it for more directions.
Its from my byteoff project, so i erased the doublejump function from it. So this should work just creating the projectile.
It might be better ways of doing this, but i had a lot of romspace and not so much time so this is how i solved the problem:
Code:
;;custom create projectile script - up/left/right/down
;;;Uses gameobject 02 as projectilesource, can be changed in the code below
;;; I set up different actionsteps for the projectile to be able to have different
;;; animations of the projectile for all the directions. If your projectile is a "ball"
;;; and looks the same in every direction. You only need one actionstep for the projectile.
;my proj setup
;actionstep0 - normal left/right projectile
;actionstep1 - proj going down
;actionstep2 - proj going up
;;;I wanted the player to have different animations shooting in different directions
;;;so the set up that worked on my player
;actionstep3 - normal left/right projectile
;actionstep5 - proj going down
;actionstep3 - proj going up
;;if you only want to use one shoting animation/actionstep for your player
;;you can set that up at line 39, early in the beguinning of the code and ;komma out; the
;;changing of the players actionsteps for the different directions at line 93, 150, 202
;;This limits projectiles on screen
CountObjects #%00000100 ;player weapons on screen
CMP #2 ; Max Number of player projectiles on screen
BNE yesCanShootProjectile
JMP +skipToENd
yesCanShootProjectile:
;;;Here you can change player into shooting actionstep, if it is one and the same for all directions
;;;Otherwise we set the different actionsteps for your player after the projectile been created later in the script
;;change player into shooting animation
;;ChangeActionStep #00, #$03
LDA gamepad
AND #%00100000 ; check down button
BNE +downPressed
JMP +skipButtonDown
+downPressed:
;down was pressed, do stuff here
;;create a projectile going down
TXA
PHA
TYA
PHA
LDX player1_object
LDA Object_x_hi,x
CLC
ADC #$04
STA tempA
LDA Object_screen,x
ADC #$00
STA tempD
LDA Object_y_hi,x
CLC
ADC #$01 ;#$04
STA tempB
LDA Object_direction,x
AND #%00000111
STA tempC
;;i have GameObject2 beeing the projectile,
;;actionstep 01- projectile going down animation.
CreateObjectOnScreen tempA, tempB, #$02, #$01, tempD
;;; x, y, object, starting action.
;;; and now with that object, copy the player's
;;; direction and start it moving that way.
LDA tempC
STA Object_direction,x
TAY
;LDA DirectionTableOrdered,y
;STA temp1
TXA
STA temp
StartMoving temp, #DOWN ;temp1
PLA
TAY
PLA
TAX
;;Here i set up my player in a actionstep for animation shooting down
;;change player into shooting DOWN animation
ChangeActionStep #00, #$05
;;PlaySound #sfx_whip
JMP +skipToENd:
+skipButtonDown:
;;;;;;;;;;;;;;;;;;;shoot projectile up
LDA gamepad
AND #%00010000 ; check up button
BNE +upPressed
JMP +skipButtonUp
+upPressed:
;up was pressed, do stuff here
;;create a projectile going up
TXA
PHA
TYA
PHA
LDX player1_object
LDA Object_x_hi,x
CLC
ADC #$04
STA tempA
LDA Object_screen,x
ADC #$00
STA tempD
LDA Object_y_hi,x
CLC
ADC #$01 ;#$04
STA tempB
LDA Object_direction,x
AND #%00000111
STA tempC
;;My Projectile is gameobject 2
;;its actonstep 2 has a projectile going up animation
CreateObjectOnScreen tempA, tempB, #$02, #$02, tempD
;;; x, y, object, starting action.
;;; and now with that object, copy the player's
;;; direction and start it moving that way.
LDA tempC
STA Object_direction,x
TAY
;LDA DirectionTableOrdered,y
;STA temp1
TXA
STA temp
StartMoving temp, #UP ;temp1
PLA
TAY
PLA
TAX
;;change player into shooting UP animation
ChangeActionStep #00, #$03
;;PlaySound #sfx_whip
JMP +skipToENd:
+skipButtonUp:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;end of shoot proj up
;;No directional buttons where pressed lets just
;;create a "normal" projectile going Left/right
TXA
PHA
TYA
PHA
LDX player1_object
LDA Object_x_hi,x
CLC
ADC #$04
STA tempA
LDA Object_screen,x
ADC #$00
STA tempD
LDA Object_y_hi,x
CLC
ADC #$01 ;#$04
STA tempB
LDA Object_direction,x
AND #%00000111
STA tempC
;;My Projectile is gameobject 2
;;its actonstep 0 has the normal projectile animation
CreateObjectOnScreen tempA, tempB, #$02, #$00, tempD
;;; x, y, object, starting action.
;;; and now with that object, copy the player's
;;; direction and start it moving that way.
LDA tempC
STA Object_direction,x
TAY
LDA DirectionTableOrdered,y
STA temp1
TXA
STA temp
StartMoving temp, temp1
PLA
TAY
PLA
TAX
;;change player into shooting animation
ChangeActionStep #00, #$03
;;PlaySound #sfx_whip
+skipToENd:
RTSTheRetroBro
Active member
Thaks for sharing I'll dig into this. My shoot projectile script has the option of shooting two different projectiles depending on what you select. When I get home Ill share my script as well
TheRetroBro
Active member
So I made some progress. I took your code and integrated it with my shoot projectile script. Right now Im just using the Up feature to shoot up. If i press up and shoot I do shoot however my projectile just hangs in mid-air . Which is interesting because if i shoot normal my projectile moves as needed here is my code :
Code:
;; Create a Projectile.
;;; Assumes that the projectile you want to create is in GameObject Slot 01.
;;; Assumes variable called myAmmo exists.
PlaySound #sfx_index_sfx_shoot
LDA activeWeapon
CMP #1 ;;; Normal weapon
BEQ +shootNormal
CMP #3 ;;; Super weapon
BEQ +shootSuper
JMP +canNotShoot
+shootSuper:
LDA myAmmo
BNE +canShootSuperWeapon
PlaySound #sfx_index_sfx_noammo;;; Maybe play a sound if there's no ammo
JMP +canNotShoot
+canShootSuperWeapon:
DEC myAmmo
+shootNormal:
;;;;;;;;;;;;;;;;;;;shoot projectile up
LDA gamepad
AND #%00010000 ; check up button
BNE +upPressed
JMP +skipButtonUp
+upPressed:
;up was pressed, do stuff here
;;create a projectile going up
TXA
PHA
TYA
PHA
LDX player1_object
LDA Object_x_hi,x
CLC
ADC #$04
STA tempA
LDA Object_screen,x
ADC #$00
STA tempD
LDA Object_y_hi,x
CLC
ADC #$01 ;#$04
STA tempB
LDA Object_direction,x
AND #%00000111
STA tempC
;;My Projectile is gameobject 2
;;its actonstep 2 has a projectile going up animation
CreateObjectOnScreen tempA, tempB, activeWeapon, #$02, tempD
;;; x, y, object, starting action.
;;; and now with that object, copy the player's
;;; direction and start it moving that way.
LDA tempC
STA Object_direction,x
TAY
;LDA DirectionTableOrdered,y
;STA temp1
TXA
STA temp
StartMoving temp, #UP ;temp1
PLA
TAY
PLA
TAX
;;change player into shooting UP animation
;ChangeActionStep #00, #$03
;;PlaySound #sfx_whip
JMP +skipToENd:
+skipButtonUp:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;end of shoot proj up
;;No directional buttons where pressed lets just
;;create a "normal" projectile going Left/right
TXA
PHA
TYA
PHA
LDX player1_object
LDA Object_x_hi,x
CLC
ADC #$04
STA tempA
LDA Object_screen,x
ADC #$00
STA tempD
LDA Object_y_hi,x
CLC
ADC #$04
STA tempB
LDA Object_direction,x
AND #%00000111
STA tempC
CreateObjectOnScreen tempA, tempB, activeWeapon, #$00, tempD
;;; x, y, object, starting action.
;;; and now with that object, copy the player's
;;; direction and start it moving that way.
LDA tempC
STA Object_direction,x
TAY
LDA DirectionTableOrdered,y
STA temp1
TXA
STA temp
StartMoving temp, temp1
PLA
TAY
PLA
TAX
+canNotShoot:
RTS
+skipToENd:
+canNotShoot:
RTS
Last edited:
smilehero65
Active member
Have you checked this thread?
Vertical movement AI for enemies in metroidvania project
Hi! (first post on this forum) Just downloaded NesMaker a few days ago. I'm using the metroidvania template to try and get some hands-on experience with this tool, but I'm having trouble getting enemies to move vertically (while ignoring gravity). I found the "MoveLeft" asm, which is as...
TheRetroBro
Active member
For everyone wondering I got it figured out after day I got it working! I will post my code below and a video with the result. Essentially i had to change the physics script to allow upward movement: and adjust my shoot projectile code with using @RustyRetroEntertainmentSy suggestion!
Code:
;; Create a Projectile.
;;; Assumes that the projectile you want to create is in GameObject Slot 01.
;;; Assumes variable called myAmmo exists.
PlaySound #sfx_index_sfx_shoot
LDA activeWeapon
CMP #1 ;;; Normal weapon
BEQ +shootNormal
CMP #3 ;;; Super weapon
BEQ +shootSuper
JMP +canNotShoot
+shootSuper:
LDA myAmmo
BNE +canShootSuperWeapon
PlaySound #sfx_index_sfx_noammo;;; Maybe play a sound if there's no ammo
JMP +canNotShoot
+canShootSuperWeapon:
DEC myAmmo
+shootNormal:
;;;;;below code checks for down button
LDA gamepad
AND #%00100000 ; check down button
BNE +downPressed
JMP +skipButtonDown
+downPressed:
;down was pressed, do stuff here
;;create a projectile going down
TXA
PHA
TYA
PHA
LDX player1_object
LDA Object_x_hi,x
CLC
ADC #16
STA tempA
LDA Object_screen,x
ADC #$00
STA tempD
LDA Object_y_hi,x
CLC
ADC #16
STA tempB
LDA Object_direction,x
AND #%00000111
STA tempC
CreateObjectOnScreen tempA, tempB, activeWeapon, #$00, tempD
;;; x, y, object, starting action.
;;; and now with that object, copy the player's
;;; direction and start it moving that way.
LDA tempC
STA Object_direction,x
TAY
LDA DirectionTableOrdered,y
STA temp1
TXA
STA temp
StartMoving temp, temp1
PLA
TAY
PLA
TAX
ChangeActionStep #00, #$03
+canNotShoot:
RTS
;;Here i set up my player in a actionstep for animation shooting down
;;change player into shooting DOWN animation
;;ChangeActionStep #00, #$05
;;PlaySound #sfx_whip
JMP +skipToENd:
+skipButtonDown:
;;;;;;;;;;;;;;;;;;;shoot projectile up
LDA gamepad
AND #%00010000 ; check up button
BNE +upPressed
JMP +skipButtonUp
+upPressed:
;up was pressed, do stuff here
;;create a projectile going up
TXA
PHA
TYA
PHA
LDX player1_object
LDA Object_x_hi,x
CLC
ADC #$04
STA tempA
LDA Object_screen,x
ADC #$00
STA tempD
LDA Object_y_hi,x
CLC
ADC #$01 ;#$04
STA tempB
LDA Object_direction,x
AND #%00000111
STA tempC
;;My Projectile is gameobject 2
;;its actonstep 2 has a projectile going up animation
CreateObjectOnScreen tempA, tempB, activeWeapon, #$02, tempD
;;; x, y, object, starting action.
;;; and now with that object, copy the player's
;;; direction and start it moving that way.
LDA tempC
STA Object_direction,x
TAY
;LDA DirectionTableOrdered,y
;STA temp1
TXA
STA temp
StartMoving temp, #UP ;temp1
PLA
TAY
PLA
TAX
;;change player into shooting UP animation
ChangeActionStep #00, #$06
;;PlaySound #sfx_whip
JMP +skipToENd:
+skipButtonUp:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;end of shoot proj up
;;No directional buttons where pressed lets just
;;create a "normal" projectile going Left/right
TXA
PHA
TYA
PHA
LDX player1_object
LDA Object_x_hi,x
CLC
ADC #$09
STA tempA
LDA Object_screen,x
ADC #$00
STA tempD
LDA Object_y_hi,x
CLC
ADC #$09
STA tempB
LDA Object_direction,x
AND #%00000111
STA tempC
CreateObjectOnScreen tempA, tempB, activeWeapon, #$00, tempD
;;; x, y, object, starting action.
;;; and now with that object, copy the player's
;;; direction and start it moving that way.
LDA tempC
STA Object_direction,x
TAY
LDA DirectionTableOrdered,y
STA temp1
TXA
STA temp
StartMoving temp, temp1
PLA
TAY
PLA
TAX
+canNotShoot:
RTS
+skipToENd:
+canNotShoot:
RTS
Yes, it's a known "issue"—although it's not really an issue per se, but rather a deliberate choice made by Joe for optimization purposes, particularly with the scrolling modules (no vertical movements in the Physics for those modules).
As @smilehero65 mentioned, there are various topics on implementing vertical movements, inspired by the code used in other modules.
As @smilehero65 mentioned, there are various topics on implementing vertical movements, inspired by the code used in other modules.