SVEDEN11 [Lexaloffle Blog Feed]

Dungeon Song Test v1

Sat, 14 Mar 2020 00:23:07 UTC

Dungeon Song Test v1

by SVEDEN11

[Click to Play]

This is just a small loop I've been working on which I plan to put in one of my games, but thought I'd upload it to see what others think. It doesn't use any custom instruments and so far any additional layers I've attempted to add (drums, other melodies, etc.) haven't really sounded right. I'm curious if folks think this loop stands on its own enough or if it would become annoying to listen to after a while. Any general feedback is welcome.

How to check for overlapping sprites?

Mon, 09 Jan 2017 02:19:17 UTC

When I try to run the code listed below, my game freezes because of the while loop. Can anyone shed some light on how I can prevent the while loop in this code snippet from choking? Or if there's a better way all together?

I'm hoping to add additional objects to these functions (though they would be single objects instead of sets of 30 and 15, but I'm not at all an experienced coder.

I was trying to borrow code from the following page: https://level0gamedev.blogspot.com/2016/05/back-to-game-code.html

I'm also having a second issue of all 45 sprites being set to foo's sprite instead of 30 for foo and 15 for bar, but i'll have to tackle that later unless someone can weigh in on that as well.

Any help is greatly appreciated! Thank you :)

function _init()
test = 0

for i = 1, 30 do
    spawn_actor(foo)
end

for i = 1, 15 do
    spawn_actor(bar)
end 

function spawn_actor(name)
    local obj = {}

    obj.type = name
    obj.frame = nil
    obj.x = flr(rnd(right_border) + left_border)
    obj.y = flr(rnd(bottom_border - top_border) + top_border)
    obj.w = 8
    obj.h = 8
    obj.x2 = obj.x + obj.w * 8
    obj.y2 = obj.y + obj.h * 8

    if obj.name == foo then
        obj.frame = 16 + flr(rnd(3))
    elseif obj.name == bar then
        obj.frame = 32
    end

    overlapped = true
        while overlapped do
        overlapped = false
        foreach(actors, function(actors)
            if actors.x <= obj.x + obj.w * 8 + 1 and 
            actors.x + actors.w * 8 >= obj.x - 1 and 
            actors.y <= obj.y + obj.h * 8 + 1 and 
            actors.y + actors.h * 8 >= obj.y - 1 then
                test += 1
                overlapped = true
                obj.x = flr(rnd(right_border) + left_border)
                obj.y = flr(rnd(bottom_border - top_border) + top_border)
            end
        end)
    end
    add(actors, obj)
end

function _draw()
    cls()
    foreach (actors, draw_actor)
end

function draw_actor(obj)
    spr(obj.frame, obj.x, obj.y, 1, 1)
end

Is there any way to simulate z-index?

Sat, 07 Jan 2017 07:38:39 UTC

Hi,

I'm trying to have a sprite move in front of and behind other objects to simulate z-index ordering, but I'm not sure how to do this in PICO-8. I figured it would work something like if object_a.y > object_b.y, move behind that object.

I saw somewhere someone giving each object/sprite a "z" variable that would control what order things were drawn, but that wasn't for PICO-8 so I don't know if that could be recreated here.

After some searching, I see that this has been done in The Lair and Kick Wizards, but I'm very new to Lua/PICO-8 so I'm having a hard time finding how they're doing it. Any help is greatly appreciated.

The Lair: https://www.lexaloffle.com/bbs/?tid=4051
Kick Wizards: https://www.lexaloffle.com/bbs/?tid=27697

Thanks!