Learning how to script, pointers requested.

#1 I tried collision which I found from some other post asking bit same, but most of the help on posts are describing the problem on general level like "You need to apply it with player touching ground" instead of "like you can see from this code *code* it applies when touching ground*. I know I'm new to coding and probably annoying, but I still haven't got my head around this problem and trust me I've been trying to solve this nonstop, alas haven't succeeded.

My logic was that "if object is not moving, it must be on ground. So if velocity is 0 you are on ground.

I'm new to scripting, but really excited and motivated to learn more, I hugely appreciate any pointers.

Thank you!

#2 What I tried next was naming scene object by name of "ground", knowing my character's class is "megaman" (btw just for training purposes, not attempting to actually a make a megaman game) I could place that into code too. I simply tried if I can find a solution from here, hence if megaman and ground meet there should be "working" in console, alas there's no such thing.

//Collision attempt.

function ground::onCollision(%this, %obj, %col)
{
	
if(%col.getClassName() $= "megaman")
{ 
echo("working!");
%obj.delete();

}

}

//Collision attempt.

#3 Welcome to TGB! I don't know if this will exactly solve your problem, but here is an example of how to control the player jumping. The basic assumption is that when the player is on the ground, we don't need to have gravity turned on. When the jump key is pressed, this method is called:

function PlatformerControlsBehavior::jumpAction(%this, %val)
{
   %this.jump = %val;
   %gravity = %this.owner.getConstantForceY();
   
   if (!%gravity)
      %this.updateMovementY();
   
   %this.updateAnimation();
}

%val (and %this.jump) are given a value of 1 when the key is pressed down, and a value of 0 when the key is released. Then, we check if our character currently has a constant force (i.e. gravity) pushing on it. If the constant force is 0, then we know the player is on the ground and is allowed to jump - the if (!%gravity) condition is true and we can call %this.updateMovementY();

If the constant force is any number other than 0, then we know the player is in the air and should not be allowed to jump again - the if condition is false and the updateMovementY method is skipped.

In case it interests you, within the updateMovementY method is where we apply a linear velocity to the player character and turn gravity on. It looks like this:

function PlatformerControlsBehavior::updateMovementY(%this)
{
   %this.owner.setLinearVelocityY(%this.jump * %this.jumpSpeed);
   
   if (%this.jump)
   {
      %this.owner.setConstantForceY(%this.gravity);
   }
}

The tutorial this is from isn't very beginner friendly, but if you want to take a look it can be found here: tdn.garagegames.com/wiki/TGB/Tutorials/Platformer/Player. The behavior code is at the bottom of the page and meant to replace the entire playerClass script due to some issues that have cropped up with the physics in TGB.

#4 Thank you for your reply

I tried applying the code, however console tells me that:
(28): Unable to find object '᡺᡺᡺᡺᡺@{᡺'
(31): Unable to find object: '' attempting to call function "UpdateMovementY"
(32): Unable to find object: '' attempting to call function "updateAnimation"

function Megaman::onLevelLoaded(%this, %scenegraph)

// DEFINING WHAT BUTTONS ARE AVAIBLE

{
   $Megaman = %this;
      
   moveMap.bindCmd(keyboard, "Up", "Up();", "UpStop();");
      
   %this.enableUpdateCallback();
}

//==== UP BUTTON ==========

function Up()
{
PlatformerControlsBehavior::jumpAction();
}

function UpStop()
{
}
//==== UP BUTTON ENDS =====

function PlatformerControlsBehavior::jumpAction(%this, %val)
{
   %this.jump = %val;
   %gravity = %this.owner.getConstantForceY();
   if (!%gravity)
   {
   %this.updateMovementY();
   %this.updateAnimation();
   }
}

I have a feeling I don't quite understand how %this works, my best guess is that it's referring to whatever "%this" at current time is? However if this is the case I do not know how to declare and tell computer what "%this" supposed to be.

ps. is "%this" used to define where a variable is stored?

#5 %this refers to the object that a particular function is being called on. It is useful for functions that apply to multiple objects, either because they share the same class or use the same behavior. There was a recent thread that discussed %this here: www.torquepowered.com/community/forums/viewthread/107709. If you still have questions, feel free to ask.

As long as you only have 1 "Megaman" in your level, you have already assigned that object to the global variable $Megaman. You can then call functions like below:

function Up()
{
   %gravity = $Megaman.getConstantForceY();
   
   if (!%gravity)
   {
      $Megaman.updateMovementY();
   }
}