Vertical moving platform stops moving if I am on it when it touches the ground

[pixeltroid]

1. If I am NOT standing on the platform, the platform changes direction when it touches the ground normally.
2. But if I am standing on it when it touches the ground, it stops moving. Its only when I jump up does the platform starts moving.

Here's a visual of the same thing happening:



Here are the codes for the vertical moving platform "obj_movingplatform_vnew":

CREATE

dir = choose(-1, 1);

STEP

if dir = 1 {
y+=1}
else
{y-=1}

Collision with obj_solid

dir *= -1

Collision with obj_blocker*

dir *= -1

(*basically obj_blocker is an invisible object that I place in the room editor that causes the platform to stop and change direction. This is useful because it helps me control the distance the platform moves in the room editor itself).

In the player object's step event I have this:

STEP

if place_meeting (obj_player.x, obj_player.y+1 , obj_movingplatform_vnew)
{
y += 1 * obj_movingplatform_vnew.dir
}

I have the exact same code for the horizontal moving platform (except it's "x" instead of "y") but that works fine without any issue.

Does any one know whats causing the issue? How do I fix it?

Any help would be greatly appreciated!

 

[Slyddar]

Is it possible the obj_blocker and obj_solid are cancelling each other out? Add a breakpoint in the collision with obj_solid and place the player on the platform, then run in debugger mode and see what happens.

 

[pixeltroid]

Is it possible the obj_blocker and obj_solid are cancelling each other out? Add a breakpoint in the collision with obj_solid and place the player on the platform, then run in debugger mode and see what happens.

I tested it against both the obj_blocker and obj_solid. Im still having the same issue!

 

[Slyddar]

You should use the debugger. Put a watch on the dir variable in your platform and see what it does as you step through the code...or at least use some show_debug_message(dir) lines in the platform to see what it's doing when it's not moving.

 

[Slyddar]

Also you could get rid of your collision events and try replacing your step with this.

if dir = 1 {
  if !place_meeting(x, y + 1, obj_solid) and !place_meeting(x, y + 1, obj_blocker)
    y+=1
  else
    dir = -dir;
}
else
{
  if !place_meeting(x, y - 1, obj_solid) and !place_meeting(x, y - 1, obj_blocker)
    y-=1
  else
    dir = -dir;
}

 

[pixeltroid]

Also you could get rid of your collision events and try replacing your step with this.

if dir = 1 {
  if !place_meeting(x, y + 1, obj_solid) and !place_meeting(x, y + 1, obj_blocker)
    y+=1
  else
    dir = -dir;
}
else
{
  if !place_meeting(x, y - 1, obj_solid) and !place_meeting(x, y - 1, obj_blocker)
    y-=1
  else
    dir = -dir;
}

Hi. Thanks for the code. Unfortunately it didnt work. It's causing the player slides away from the platform :/

Anyway, I modified the code a bit to just work with a timer:

Create:
dir = choose(-1, 1);
timer = 0;

Step
timer += 1
if timer > 200 // I modify this to increase/ decrease the distance the platform travel
{
timer = 0
dir *= -1;
}
y += dir * 2


So yeah, I would need to calculate some things to get the distance right. But I will use this for now.

If you have an alternate way to make the old code work, i.e., change direction upon touching obj_solid please let me know.

 

[Deleted member 16767]

Hello @pixeltroid . Try making it a child to obj_solid? This is just a wild guess.

Or use mp pathfinding.

 

[Joe Ellis]

If the problem is that the direction is switching twice per step, you could make a limit that only allows one direction change per step,
something like:

begin step event:

switched = false

collision event (with both objects):

if !switched
{
dir *= -1
switched = true
}

 

[pixeltroid]

If the problem is that the direction is switching twice per step, you could make a limit that only allows one direction change per step,
something like:

begin step event:

switched = false

collision event (with both objects):

if !switched
{
dir *= -1
switched = true
}

hi. Thanks. I'll try your method and report back.

 

[pixeltroid]

Hello @pixeltroid . Try making it a child to obj_solid? This is just a wild guess.

Or use mp pathfinding.

its already a child to obj_solid. I looked up mp pathfinding and it seems pretty complex. I'll take some time to figure out how to apply it. But I'll make it a point to study it for other uses in my project.

 

[Deleted member 16767]

its already a child to obj_solid. I looked up mp pathfinding and it seems pretty complex. I'll take some time to figure out how to apply it. But I'll make it a point to study it for other uses in my project.

I believe this is what you need: https://docs.yoyogames.com/source/d...ollisions/motion planning/mp_linear_step.html