Advise me, please. zLevel does odd things.

Questions
21

@RonJeffries Heres an example using the above function. One thing I saw when using it was anytime a zLevel used a negative value, the background of the current sprite would show over the next sprite. I was able to solve that problem by putting the desired zLevel in a table with the image and sorting on zLevel so the images were drawn from low to high.

viewer.mode=FULLSCREEN

function setup()
    fill(255)
    tab={
        {img=asset.builtin.Space_Art.UFO,lev=10},
        {img=asset.builtin.SpaceCute.Health_Heart,lev=-3},
        {img=asset.builtin.Space_Art.Asteroid_Large,lev=7},
        {img=asset.builtin.Space_Art.Red_Ship,lev=4},
        {img=asset.builtin.Planet_Cute.Character_Horn_Girl,lev=-5},
        }
    sort(tab)
end

function draw()
    background(92, 89, 32)
    currZlevel=0
    for z=1,#tab do
        setZlevel(tab[z].lev)
        text(currZlevel,WIDTH/6+100*z,HEIGHT/2+150)
        sprite(tab[z].img,WIDTH/6+100*z,HEIGHT/2,200)
    end
end

function setZlevel(z)
    zLevel(z-currZlevel)
    currZlevel=z
end

function sort(tbl) 
    table.sort(tbl,
    function(a,b)
        if a.lev<b.lev then
            return true
        end
        return false
    end)
end
22

The reason for the zLevel(0) is that the code works if the bug gets fixed, guaranteeing that zLevel is always 0 after use.

Yes, sorting in z order works, that’s what I’m currently doing.

Thanks!