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

function reset()
    plr_alive=true
    plr_win=false
    plr_docked=false
    plr_pos={x=5,y=8}
    plr_speed={x=0.5,y=0}
    plr_static=false
    plr_engine=-1
    plr_fuel=1
    plr_landings=0
    plr_transed=0
    plr_money=0
    plr_target={x=8,y=2}
    
    telem_spd={}
    
    gravity=0.02
    engine_power=0.1
    fuel_cons=0.01
    land_speed_limit=1
    maph=8
    bonus_docked=1
    cam={}

    next_target()
end

function _init()
    reset()
end

function _update()
    debug_points={}
    if not plr_alive and btn(❎) then
        reset()
    end

    -- controlls
    plr_engine=-1
    if plr_alive and plr_fuel>0 then
        if not plr_docked 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
        if plr_docked and btn(❎) then
            plr_docked=false
            plr_static=false
            plr_engine=⬆️
            plr_speed={x=0,y=0.5}
            sfx(4)
        end
	end

    -- engine
    if plr_engine==⬆️ then
        plr_speed.y+=engine_power
    elseif 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)
        plr_fuel=max(0,plr_fuel-fuel_cons)
    else
        sfx(-1,2)
    end

    if plr_docked then
        plr_fuel=min(1,plr_fuel+fuel_cons)
    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 and not plr_static 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 dock=fget(pmaps,7)
            local target=dist(plr_pos,plr_target)<=1
            local solid=fget(pmaps,0)
            local slow=dist(plr_speed) < land_speed_limit
            if dock and slow and p.y < pc.y then
                plr_speed={x=0,y=0}
                plr_pos={x=flr(plr_pos.x+0.5),y=flr(plr_pos.y+0.5)}
                plr_docked=true
                plr_static=true
                plr_landings+=1
                if target then
                    plr_money+=bonus_docked
                    next_target()
                end
                sfx(1)
                break
            elseif solid or plr_pos.y<=0 then
                plr_speed.y*=-0.75
                plr_speed.x*=0.5
                plr_alive=false
                if (dist(plr_speed) > 1) then
                    sfx(0)
                else
                    plr_speed.x=0
                    plr_speed.y=0
                    plr_static=true
                    sfx(3)
                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}
end

function _draw()
    cls()

    camera(cam.x,cam.y)
    map(0, 0, 0, 128-maph*8)

    local px,py=to_scrn(plr_pos)
    local img=0
    if plr_docked then
        img=5
    elseif not plr_alive then
        img=4
    elseif plr_engine==⬆️ then
        img=2
    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

    -- target
    if plr_alive then
        local tx,ty=to_scrn(plr_target)
        local dst=dist(plr_pos,plr_target)
        local c=flr(t())%2==0 and 3 or 11
        if dst > 8 then
            local dir=atan2(tx-px,ty-py)
            line(px+4+cos(dir)*10,py+4+sin(dir)*10,tx+4,ty+4,c)
        end
        if dst > 3 then
            print("웃",tx,ty+2,c)
        else
            print("__",tx,ty+4,c)
        end
    end

    --
    -- HUD
    --
    camera(0,0)

    -- fuel
    local fw=20
    local fh=6
    local fx=85
    local fy=0
    rect(fx,fy,fx+fw,fy+fh,5)
    rectfill(fx+1,fy+1,fx+plr_fuel*(fw-1),fy+fh-1,plr_fuel > 0.25 and 13 or 8)
    print("fuel", fx+3,fy+1,1)

    -- telemetry
    local cr=10
    local cp={x=127-cr,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

    if plr_alive then
        if plr_docked then
            print("smooth! you docked.", 0,0,3)
            print("press ❎ to undock.", 32,60,11)
        else
            print("land gently to dock.", 0,0,3)
        end
    else
        print("oops! you crashed.", 0,0,8)
        print("press ❎ to reset.", 32,60,11)
    end
    print("⌂"..plr_landings, fx,fy+fh+2+0,3)
    print("웃"..plr_transed, fx,fy+fh+2+8,3)
    print("✽"..plr_money, fx,fy+fh+2+16,3)
end

function next_target()
    local docks={}
    for x=0,127 do
        for y=0,maph do
            local m=mget(x,y)
            local dock=fget(m,7)
            local new=x!=plr_target.x and y!=plr_target.y
            if dock and new then
                add(docks,{x=x,y=y})
            end
        end
    end
    local di=flr(rnd(#docks))+1
    local mp=docks[di]
    plr_target={x=mp.x,y=maph-mp.y+1}
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,p2)
    p2=p2 or {x=0,y=0}
    return abs(p.x-p2.x) + abs(p.y-p2.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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