pico-8 cartridge // http://www.pico-8.com
version 42
__lua__
-- MoonBus
-- by Dejvino

plr_alive=true
plr_win=false
plr_pos={x=5,y=8}
plr_speed={x=0.5,y=0}
plr_static=false
plr_engine=-1

telem_spd={}

gravity=0.02
engine_power=0.2
land_speed_limit=1
maph=8
cam={}

function _update()
    debug_points={}

    -- controlls
    plr_engine=-1
    if plr_alive then
	    if btn(⬆️) then plr_engine=⬆️ end
	    if btn(⬇️) then plr_engine=⬇️ end
	    if btn(⬅️) then plr_engine=⬅️ end
	    if btn(➡️) then plr_engine=➡️ end
	end

    -- engine
    if plr_engine==⬆️ then
        plr_speed.y+=engine_power
    elseif plr_engine==⬅️ then
        plr_speed.x-=engine_power
    elseif plr_engine==➡️ then
        plr_speed.x+=engine_power
    end

    if plr_engine != -1 then
        sfx(2,2)
    else
        sfx(-1,2)
    end

    -- move objects
    move(plr_pos,plr_speed,0.1)

    -- gravity pull
    if not plr_static then
        plr_speed.y-=gravity
    end

    -- crash detection
    local pc=plus(plr_pos,{x=0.5,y=-0.5})
    if pc.y <= maph then
        for p in all({plus(pc,clearx(unit(plr_speed,0.4))), plus(pc,cleary(unit(plr_speed,0.4)))}) do
            local pmaps=mget(p.x,maph-p.y)
            local target=fget(pmaps,7)
            local solid=fget(pmaps,0)
            if plr_win != true and target and dist(plr_speed) < land_speed_limit and p.y < pc.y then
                plr_win=true
                plr_speed={x=0,y=0}
                plr_pos={x=flr(plr_pos.x+0.5),y=flr(plr_pos.y+0.5)}
                sfx(1)
                break
            elseif solid or plr_pos.y<=0 then
                plr_speed.y*=-0.75
                plr_alive=false
                if (dist(plr_speed) > 1) then
                    sfx(0)
                else
                    plr_speed.x=0
                    plr_speed.y=0
                    plr_static=true
                end
                break
            end
        end
    end

    if plr_alive then
        telem_spd=mul(plr_speed,1)
    end

    cam={x=plr_pos.x*8-60, y=0}
    camera(cam.x,cam.y)
end

function _draw()
    cls()

    map(0, 0, 0, 128-maph*8)

    local px,py=to_scrn(plr_pos)
    local img=0
    if plr_win then
        img=5
    elseif not plr_alive then
        img=4
    elseif plr_engine==⬆️ then
        img=2
    elseif plr_engine==⬅️ then
        img=3
    elseif plr_engine==➡️ then
        img=1
    end
    spr(img,px,py)

    for p in all(debug_points) do
        local px,py=to_scrn(p)
        pset(px,py,8)
    end

    -- telemetry
    local cr=10
    local cp={x=cam.x+127-cr,y=cam.y+cr}
    local spd={x=limit(telem_spd.x,1),y=limit(telem_spd.y,1)}
    circ(cp.x,cp.y,cr,3)
    line(cp.x,cp.y,cp.x+spd.x*cr,cp.y,11)
    line(cp.x,cp.y,cp.x,cp.y-spd.y*cr,11)
    circ(cp.x+spd.x*cr,cp.y-spd.y*cr,1,dist(telem_spd)<land_speed_limit and 3 or 8)
    if not plr_alive then
        line(cp.x+(-0.3*cr),cp.y+(-0.6*cr),cp.x,cp.y,5)
        line(cp.x+(-0.7*cr),cp.y+(-0.3*cr),cp.x,cp.y,5)
        line(cp.x,cp.y,cp.x+0.6*cr,cp.y+0.3*cr,5)
        line(cp.x+0.6*cr,cp.y+0.3*cr,cp.x+0.2*cr,cp.y+0.8*cr,5)
    end
end

function to_scrn(p)
    local x=p.x*8
    local y=128-p.y*8
    return x,y
end

function move(p,d,a)
    a=a or 1
    p.x+=d.x*a
    p.y+=d.y*a
end
function plus(p,d,a)
    a=a or 1
    return {
        x=p.x+d.x*a,
        y=p.y+d.y*a
    }
end
function clearx(p)
    return {
        x=0,
        y=p.y
    }
end
function cleary(p)
    return {
        x=p.x,
        y=0
    }
end
function mul(p,a)
    return {
        x=p.x*a,
        y=p.y*a
    }
end
function neg(p)
    return mul(p,-1)
end

function dist(p)
    return abs(p.x) + abs(p.y)
end

function unit(p,u)
    u=u or 1
    local x = 0
    local y = 0
    if p.x>0 then x=u end
    if p.x<0 then x=-u end
    if p.y>0 then y=u end
    if p.y<0 then y=-u end
    return {x=x,y=y}
end
function limit(val,lim)
    if (abs(val) > lim) then
        return val*lim/abs(val)
    end
    return val
end
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