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I am working on a simple game that contains two objects the player and the ground, and I used place_meeting to make the player walk on the ground object and it works fine but when I try to add another object to make the player walk on it, it didn't work and the game freeze, here is my code:

// vertical collision
if place_meeting(x,y+vsp,ground1) or place_meeting(x,y+vsp,ground2)
{
while ((!place_meeting(x,y+sign(vsp),ground1 )) or (!place_meeting(x,y+sign(vsp),oground1=2 )))

 y+=sign(vsp);

    if (sign(vsp) ==1)
    {
    grounded = 1;
    }

    vsp =0;

 }
else
{
grounded = 0;
}
y+= vsp;
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    \$\begingroup\$ Ofc the game will freeze: when you touch the ground it will never get out of the while loop. Use an if statement. \$\endgroup\$
    – DH.
    Feb 16, 2016 at 16:05

3 Answers 3

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You will get into all sorts of problems with complex if statements. Here is the solution I use, and it works for any number of grounds.

  1. Define an object obj_ground. Put no code in this object, and do not define a sprite.

  2. Create your two types ground objects.

  3. For each of your ground objects, define obj_ground as their parent. This means that every time you reference obj_ground, you check both! Look up parent and child in the user manual, it is one of the tools that makes GameMaker so good.

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I am to understand that ground1 and ground2 are your 2 types of walkable objects.

So, on line 3 of your code, in your while loop, the object in your last check is incorrect. It shoud be (!place_meeting(x,y+sign(vsp),ground2 ))

while ((!place_meeting(x,y+sign(vsp),ground1 )) or (!place_meeting(x,y+sign(vsp),ground2 )))

Try that.

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Here's mine

//Horizontal Collision
if (place_meeting(x+hspeed,y,obj_wall))
{
    while(!place_meeting(x+sign(hspeed),y,obj_wall))
    {
        x += sign(hspeed);
    }
    hspeed = 0;
}
x += hspeed;

//Vertical Collision
if (place_meeting(x,y+vspeed,obj_wall))
{
    while(!place_meeting(x,y+sign(vspeed),obj_wall))
    {
        y += sign(vspeed);
    }
    vspeed = 0;
}
y += vspeed;
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