Deltarune (Chapter 4) script viewer

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gml_Object_obj_gh_fireball_hop_Step_1

(view raw script w/o annotations or w/e)
1 
var prev_y = y;
2 
timer += ((pi / cycle_length) * rate);
3 
y = basey - (max(0, abs(sin(timer))) * width);
4 
if (sprite_index == spr_ghost_house_pumpkin_vertical)
5 
    image_index = 
scr_approach
scr_approach

function 
scr_approach(arg0, arg1, arg2)
{
    if (arg0 < arg1)
    {
        arg0 += arg2;
        if (arg0 > arg1)
            return arg1;
    }
    else
    {
        arg0 -= arg2;
        if (arg0 < arg1)
            return arg1;
    }
    return arg0;
}
(image_index, 2.01 + (2 * sign(y - prev_y)), 1);