GML Problem to clim stairs

[Tarte]

Hi ! I have a problem climbing up stairs to my character. I wish that when he moves forward and touches the first step, he moves and goes on; so on until the last. Small diagram (Do not judge my talents of drawings lol):

 

[TheouAegis]

What code do you have to climb the first step, and does it even work?

 

[Bentley]

A simple way (incomplete code):

repeat (abs(hspd))
{
    if (place_meeting(x + sign(hspd), y, obj_stair) && !place_meeting(x + sign(hspd), y - 1, obj_stair))
    {
        x += sign(hspd)
        y -= 1;
    }
    else if (!place_meeting(x + sign(hspd), y, obj_stair))
    {
        x += sign(hspd);
    }
}

For moving down stairs change it from y - 1 to y + 1. For 2 pixel high stairs, change it from y - 1 to y - 2. If the stairs vary in height you can use a loop to measure how many pixels are on top of the pixel ahead.

 

[Bayesian]

https://zackbellgames.com/2014/10/28/understanding-collision-basics/