bythemeadow [Lexaloffle Blog Feed]

[Help] Tile collision issue

Fri, 22 Oct 2021 02:53:06 UTC

So I have an issue where the player object can clip through about half a collision tile, but only when moving to the left. As I type that I realize how weird and niche this problem is. Anyways, here's my move function:

function control_player()
newx=p.x
newy=p.y

if (btn(⬅️)) then
newx-=.1 p.sprite=d.left 
elseif (btn(➡️)) then 
newx+=.1 p.sprite=d.right 
elseif (btn(⬆️)) then
newy-=.1 p.sprite=d.up 
elseif (btn(⬇️)) then
newy+=.1 p.sprite=d.down 
end

if (can_move(newx,newy)) then
p.x=mid(0,newx,127)
p.y=mid(0,newy,63)
end

if (door_tile(newx,newy)) then
scene="room1"
p.x=6
p.y=10
end
end

and here's my collision function:

function is_tile(tile_type,x,y)
local tile_x=newx+pixeloffset_x
local tile_y=newy+pixeloffset_y
tile=mget(tile_x,tile_y)
has_flag=fget(tile,tile_type)

return has_flag
end 

function can_move(x,y)
return not is_tile(wall,x,y)
end

function door_tile(x,y)
return is_tile(door,x,y)
end

pixel_offset is initially 0, and changes based on scene to account for the map change.
Any idea what is causing this?

side note: Everyone on this forum has been so helpful and I just want to say thanks for all the help! This is my first coding project outside of html and I really appreciate it :]

[Help] Attempt to index global value (a nil value)

Wed, 20 Oct 2021 09:37:34 UTC

I am trying to use values in a table to dictate which scene is being shown in the game. I defined the table 'S' at the top of the code but a piece at the bottom referring to it comes back nil. What's the problem?

function _init()
cls()
music(0)

s={}
s.menu=1
s.start=0
s.t1=0
s.one=0

    map_setup()
    make_player()

end

    if s.menu>0 then
        screen_menu() end
    if s.start>0 then
        screen_start() end
    if s.t1>0 then
     screen_t1() end
    if s.one>0 then
        screen_scene1()
end

SFX loops way too fast

Tue, 19 Oct 2021 01:09:34 UTC

So I want to make a sound effect that only plays when a direction is pushed, and the trouble that I'm running into is that:

using (btn(input)) loops the sound so fast it almost crashes PICO-8
using (btnp(input)) only plays it when the button is first pressed

How do I make it so it plays consistently while pressing a direction, and loops at a normal speed? I tried making a timer that gets added to while a direction is pushed, but the only way I could find to do it was i+=1 which only added 1 a single time. Is a timer the right way to go or is there a more efficient way?

function move_player()
    newx=p.x
    newy=p.y

    if (btn(⬅️)) then 
        newx-=.1 p.sprite=d.left sfx(0)
            elseif (btn(➡️)) then 
                newx+=.1 p.sprite=d.right sfx(0)
                    elseif (btn(⬆️)) then
                         newy-=.1 p.sprite=d.up sfx(0)
                        elseif (btn(⬇️)) then
                             newy+=.1 p.sprite=d.down sfx(0)
    end

Here's a snippet of my code if it helps. Thanks!

How to vary a walk sprite?

Sun, 17 Oct 2021 03:27:48 UTC

So I currently have a movement system down for my player, and the sprite changes based on direction. Here's an excerpt:

function make_player()
    p={}
    p.x=3
    p.y=10
    p.sprite=4

end

function draw_player()
 spr(p.sprite,p.x*8,p.y*8)
end

function move_player()
    newx=p.x
    newy=p.y

    if (btn(⬅️)) newx-=.1 
    if (btn(➡️)) newx+=.1
    if (btn(⬆️)) newy-=.1
    if (btn(⬇️)) newy+=.1

    if (can_move(newx,newy)) then
    p.x=mid(0,newx,127)
    p.y=mid(0,newy,63)
    else
    p.x+=0
    p.y+=0
    end
end

function player_anim()
    if (btnp(⬅️)) p.sprite=3
    if (btnp(➡️)) p.sprite=2
    if (btnp(⬆️)) p.sprite=4
    if (btnp(⬇️)) p.sprite=1
end

function player_walk()

end

Now how would I go about adding footstep animations every second or so as a direction is pressed?