GameMaker Collision problem

[Marquitos3000]

Hi, I´m making a tile based collision system and I use this script:

var _collision = false;

//Tiles horizontales
if (tilemap_get_at_pixel(collisionMap, x + hSpeed, y))
{
    x -= x mod TILE_SIZE;
    if(sign(hSpeed) == 1) x += TILE_SIZE -1;
    hSpeed = 0;
    _collision = true;
}

//Cometer movimiento horizontal
x += hSpeed;

//Tiles verticales
if (tilemap_get_at_pixel(collisionMap, x, y + vSpeed))
{
    y -= y mod TILE_SIZE;
    if(sign(vSpeed) == 1) y += TILE_SIZE -1;
    vSpeed = 0;
    _collision = true;
}

//Cometer movimiento vertical
y += vSpeed;

return _collision;

The problem is that I want to increase the number of pixels that my character detects to stop horizontaly.
Because my charachter´s leg trespass the collision block. I´m ok with the vertical collision but not with the horizontal collision. What can I do? By the way, It´s origin is on the bottom center.

 

[Slyddar]

You need to adjust the sprites collision mask to cover the area where you want the collision to occur.

 

[Marquitos3000]

You need to adjust the sprites collision mask to cover the area where you want the collision to occur.

The problem is that my character´s collision isn´t the collision mask, it´s the origin. How do I replace the collision with the collision mask?

 

[jobjorgos]

do something like this and the character will stop 20 pixels early (if your hSpeed is 2 or -2)

if (tilemap_get_at_pixel(collisionMap, x + hSpeed * 10, y))

 

[Slyddar]

The problem is that my character´s collision isn´t the collision mask, it´s the origin. How do I replace the collision with the collision mask?

Your tilemap collision check should not be just checking one pixel, but there should be 4 checks at each corner of the mask instead, as that will cater for the collision mask. Use bbox to get those positions. You can also make a place_meeting_tile function which does this check for you, checking the origin and the 4 corners. As long as your mask dimensions are smaller than your tile size, it will work fine.