Need Help to Push/Pull a Box

[vonhellblazer]

I'm using tile-based collisions for this game, but ordinarily, I'd be using object-based collisions and this wouldn't be a problem. I need to push or pull an object (in this case a box) when I get up next to it. Because my collisions are tile-based, my character just passes through any object, even when it's checked solid.

CREATE:

/// @desc
//speeds

hsp                = 0;
vsp                = 0;
max_spd            = 2;
walk_spd        = 1.5;
hsp_decimal        = 0;
vsp_decimal        = 0;
jump_spd        = -5;
jumps_initial    = 2;
jumps = jumps_initial;

//friction
drag = .12;

//direction
facing = 1;

//movement
left    = 0;
right    = 0;
up        = 0;
down    = 0;
attack    = 0;
jump    = 0;

enum states {
    IDLE,
    WALK,
    JUMP,
    ATTACK
}

state = states.IDLE;

states_array[states.IDLE]            = player_idle_state;
states_array[states.WALK]            = player_walk_state;
states_array[states.JUMP]            = player_jump_state;
states_array[states.ATTACK]            = player_attack_state;


sprites_array[states.IDLE]            = s_player_idle;
sprites_array[states.WALK]            = s_player_walk;
sprites_array[states.JUMP]            = s_player_jump;
sprites_array[states.ATTACK]        = s_player_attack;

STEP:

//execute state
script_execute(states_array[state]);

COLLISION SCRIPT:

function collision() {
if hsp == 0 hsp_decimal = 0;
if vsp == 0 vsp_decimal = 0;
 
//apply carried over decimals
hsp += hsp_decimal;
vsp += vsp_decimal;
 
//floor decimals
//save and subtract decimals
hsp_decimal = frac(hsp);
hsp -= hsp_decimal;
vsp_decimal = frac(vsp);
vsp -= vsp_decimal;

//horizontal collision
var side;
//determine which side to test
if hsp > 0 side = bbox_right else side = bbox_left;
 
//check the top and bottom of the side
var t1 = tilemap_get_at_pixel(global.map, side + hsp, bbox_top);
var t2 = tilemap_get_at_pixel(global.map, side + hsp, bbox_bottom);
 
if    ((t1 != VOID) and (t1 != PLATFORM)) or
    ((t2 != VOID) and (t2 != PLATFORM)) {
    //collision found
    if hsp > 0 x = x - (x mod global.tile_size) + global.tile_size - 1 - (side - x);
    else x = x - (x mod global.tile_size) - (side - x);
    hsp = 0;
}
 
x += hsp;

//vertical collision
var side;
//determine which side to test
if vsp > 0 side = bbox_bottom else side = bbox_top;
 
//check the left and right side
var t1 = tilemap_get_at_pixel(global.map, bbox_left, side + vsp);
var t2 = tilemap_get_at_pixel(global.map, bbox_right, side + vsp);
var t3 = tilemap_get_at_pixel(global.map, bbox_left, bbox_bottom);
var t4 = tilemap_get_at_pixel(global.map, bbox_right, bbox_bottom);
 
if (t1 != VOID and (((vsp > 0 or t1 != PLATFORM)) and t3 != PLATFORM) or (t1 == SOLID and t3 == PLATFORM)) or
   (t2 != VOID and (((vsp > 0 or t2 != PLATFORM)) and t4 != PLATFORM) or (t2 == SOLID and t4 == PLATFORM)) {
    //collision found
    if vsp > 0 y = y - (y mod global.tile_size) + global.tile_size - 1 - (side - y);
    else y = y - (y mod global.tile_size) - (side - y);
    vsp = 0;
}

y += vsp;

}

MOVEMENT SCRIPT:

function calc_movement(){
hsp += (right - left) * walk_spd;
vsp += global.grav;

//drag
hsp = lerp(hsp, 0, drag);

//stop
if abs(hsp) <= 0.1 hsp = 0;

//face correct way
if hsp != 0 facing = sign(hsp);

//limit speed
hsp = min(abs(hsp), max_spd) * facing;
}

 

[KodiBoz]

I think we are in the same Udemy Course! I bought the course after watching the YouTube videos by Slyddar ( Peter Morgan), I believe. Anyways, It is a great course and he is really knowledgeable and helpful. You could probably reach out to him directly. I am sure he would provide some advice.