'DIRECTION' command

[Nonsense in BASIC]

Can someone just clear up how this works please?

I'm using it to determine which way a sprite is moving and then in turn, which way it's shooting.

Maybe I'm going about this the wrong way but I'm doing something like this (in it's simplist form):

IF DIRECTION 1
SPRITERIGHT
END IF

IF DIRECTION 0
SPRITELEFT
END IF

I'm putting this in the 'bullet' sprite script after 'SPAWN' - ing it in the main sprite script (0) - is this right?

Any help would be appreciated

Cheers.

[BiNMaN]

Direction, pretty much the same as param and paramb are variables unique to the spawned sprite and can be used similar to the global variables

they can also be sein in the sprite initialisation

ie

if type 1
let direction = 1
endif

This could be used to send a sprite in different vector as parama, paramb and direction are set to 0 when a sprite spawns, but it all depends what you do with it!

For player sprite movement you don't really need to use direction as your movements are controlled by your key presses. Direction is useful in enemy ai as they have no real input in trheir movement except by bouncing of a block or finding a ladder etc.

Where it could come in usefull is if you have an 8 way movement (just been working on one) again it's just used as a variable

ie

if key 0
add 1 to direction
if direction = 8
let drection = 0
endif
endif

if key 1
subtract 1 from direction
if direction = 255
let direction = 7
endif
endif

let a = direction

if direction = 0
if cangoup
spriteup
endif
endif

if direction = 1
if cangoright
spriteright
endif
if cangoup
spriteup
endif
endif

etc untill you've gone all the way around, by setting a to equal direction you can then pop this into another sprite type (eg 1) that is your bullet

so in the sprite initialistaion put

if type 1
let direction = a
endif

then in sprite type 1 put

if direction = 0
if cangoup
spriteup
endif
endif

if direction = 1
if cangoright
spriteright
endif
if cangoup
spriteup
endif
endif

etc so when the sprite is spawned it will take on the direction the player is facing

just to recap drection, parama and paramb are variables that are unique to the sprite, can store a number from 0-255, and can be used to make conditions only for that sprite, whereas global variables a-p can be used and affected in any part of the game

[Nonsense in BASIC]

Thanks BiNMaN.

That's explained it but now I realise I'm barking up the wrong tree. I can't get the control sprite to fire in the direction it's facing.

I've got to the point where it will fire in different directions but if you fire right then turn left the bullets turn left with the control sprite as well.
I know why this is (global variables) but I'm struggling to work out how to say 'If sprite 0 is facing left, then send sprite 7 left' it should be simple but i'm pulling my hair out!!!

[BiNMaN]

keep a global variable just for that

so going back to what I wrote when you facing a direction set the global then reverse the process into the bullet sprite

so for this example sprite type 1 is the bullet


in the player (sprite type 0) use DIRECTION to track the direction the sprite is going, let's say it your movement is left and right so:-

IF KEY 0
IF CANGOLEFT
LET DIRECTION = 0 (you could just use a global variable for this but it's useful just to use DIRECTION as it could be more aplicable in other types of movement)
SPRITELEFT
ENDIF
IF KEY 1
IF CANGORIGHT
LET DIRECTION = 1
SPRITERIGHT
ENDIF
LET A = DIRECTION

now in the Initialise Sprite part of the events menu put


IF TYPE 1
LET DIRECTION = A
ENDIF

now in sprite type 1 you'll need to put

IF DIRECTION = 0
IF CANGOLEFT
SPRITELEFT
SPRITELEFT (spriteleft twice so the bullet moves away from the player even when the player is moviung otherwise it'll stay just by him)
ENDIF
ENDIF
IF DIRECTION = 1
IF CANGORIGHT
SPRITERIGHT
SPRITERIGHT
ENDIF
ENDIF

because DIRECTION, PARAMA and PARAMB are unique to each individulal sprite on the screen (and no matter how many of the same type) anything stored as a variable using these three cannot be affected by other sprites or conditions unless you want it to be affected

here's an example of the rotational thing I described in an earlier post

myweb.tiscali.co.uk/binman/example.szx

9 left 0 right 2 thrust and Z fire bit weird I know but what I'm doing now has an autofire

[Nonsense in BASIC]

Thanks again BiNMaN!

The double 'SPRITERIGHT' was also causing me a headache!

(Nice rotational ship by the way)

[Jonathan Cauldwell]

If it makes it easier, this

SPRITERIGHT
SPRITERIGHT
can be replaced with this

ADD 4 TO Y
at the cost of an extra byte or so.

[Nonsense in BASIC]

May 10, 2012 17:36:33 GMT Jonathan Cauldwell said:

If it makes it easier, this

SPRITERIGHT
SPRITERIGHT
can be replaced with this

ADD 4 TO Y
at the cost of an extra byte or so.

Ahhh! of course. Thanks Jonathan

[Rickeytab]

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