Trying to fire a shot that keeps moving like in Centipede

[flammingcowz]

I'm new to programming and for the last few days have been studying the different example programs here on the forum while trying to figure some things out on my own along the way. One thing that I haven't seen done yet in an example that i'm trying to do is fire a missile that keeps moving even after you let go of the fire button, maybe even with rapid fire if you do hold it down. All I can get it to do is appear when the button is pressed and stop moving when you let go of the button. Is there something simple that i'm missing?

 

The relevant parts of the code are

	rem e will be timer for missile fire
 e = 1

 if joy0fire then gosub fire_missile

fire_missile
 missile0y = player0y - 7 : missile0x = player0x + 4 + e
 if e < 50 then e = e + 1
 if e = 50 then e = 0
 return

I know the way I have it done right now is kind of unnecessary, but it's just gotten more complex as I try more things.

 

default.bas

default.bas.bin

[+Random Terrain]

Have you checked out the example programs on the bB page?

 

randomterrain.com/atari-2600-memories-batari-basic-commands.html#example_programs

 

There are some examples that have a shooting missile that keeps moving even after you let go of the fire button. Here are a few:

 

randomterrain.com/atari-2600-memories-batari-basic-commands.html#repetition_restrainer_for_fire_button

 

randomterrain.com/atari-2600-memories-batari-basic-commands.html#sprite_missile_example

 

randomterrain.com/atari-2600-memories-batari-basic-commands.html#ex_tinkernut_world_deluxe

[+atari2600land]

Does this work?

 

if joy0fire && e=1 then missile0y = player0y - 7 : missile0x = player0x + 4 :e =2

if e>1 then missile0x=missile0x+1

[+Random Terrain]

Does this work?

 

if joy0fire && e=1 then missile0y = player0y - 7 : missile0x = player0x + 4 :e =2

if e>1 then missile0x=missile0x+1

 

He probably doesn't want to waste an entire variable on missile movement.

[flammingcowz]

I'm not really worried about wasting anything right now since i'm so new to programming in general, i'm more worried about just getting things working and learning along the way.

 

Thanks for the links RT, i've been going through it since then

 

Atari2600land, yeah that makes the missile keep moving even after the fire button has been released.

 

This whole programming thing is pretty overwhelming. Is there any specific language I should learn first and then come back to BB?

[+Random Terrain]

This whole programming thing is pretty overwhelming. Is there any specific language I should learn first and then come back to BB?

Check this out:

 

randomterrain.com/atari-2600-memories-batari-basic-commands.html#newtobasic