GameMaker [SOLVED](2D) (Platformer) Random movement in 2 directions

[magnum00125]

Hi
What's the code for when the object hits the obj_wall object, that it will chose to either walk left or right?

if instance_place(x,y+1,obj_wall) {
hspeed = -1.2 OR 1.2
}

My idea is like that, but what's the code for it

 

[Relic]

choose(-1.2,1.2) will randomly return one of the arguments passed to it.

 

[magnum00125]

choose(-1.2,1.2) will randomly return one of the arguments passed to it.

thanks - now i just have to solve the fact that they constantly walk back and forth instead of just choosing one direction and sticking with it

 

[orSQUADstra]

thanks - now i just have to solve the fact that they constantly walk back and forth instead of just choosing one direction and sticking with it

I assume you use vspeed. this code will apply to both y+1 and y-1 so you don't have to have this code twice. This code will only change the hspeed if it was previously 0. That should fix your problem. (that is, if your object doesn't go diagonally.)

if (instance_place(x,y+sign(vspeed),obj_wall) && hspeed = 0) {
hspeed = choose(-1.2,1.2);
}

 

[magnum00125]

I assume you use vspeed. this code will apply to both y+1 and y-1 so you don't have to have this code twice. This code will only change the hspeed if it was previously 0. That should fix your problem. (that is, if your object doesn't go diagonally.)

if (instance_place(x,y+sign(vspeed),obj_wall) && hspeed = 0) {
hspeed = choose(-1.2,1.2);
}

Why do we use sign and check for vspeed?

 

[orSQUADstra]

Why do we use sign and check for vspeed?

Actually you can leave that y+1 instead of y+sign(vspeed), it really depends on what kind of game you have. If it's a platformer then y+1 is good, if it's a top down game then you can use y+sign(vspeed) if you want this condition to apply to both y+1 and y-1, since sign will return either -1, 0 or 1 depending on the value of vspeed. If it's a side view platformer then you don't want that obviously (except if the enemy can also move on ceilings)