The Basic GML Code

Lesson 1 CH 1
the basic code is saying a message, lets begin
{
show_message('Hello World")
}

that creates a dialog message for GM to read, simple.
TIP: always put brackets above and below on some code.

Now lets try something a bit harder.

if keyboard_check(vk_right)
{
x+=3
}

Now you see that I didn't put brackets above "If" in GM if is asking a question to GM and only following what goes when the parameters are qualified, so if is asking GM if the the right arrow key is being pushed, then when the key is pressed X meaning the horizontal postion, move the player right, + means relative, and if you want to move the player left use the same code but change it a little.

if keyboard_check(vk_left)
{
x+=-3
}

You put a negative before any X type of situation, meaning to go the opposite direction of X.

That is the first chapter in the GML basic code tutorial.

CH: 2

creating objects in GML is very easy just type this.

{
instance_create(x,y,object)
}

thats the simplest of all code actually.

Now lets make a harder one, lets say we wanted to create a object every 20 seconds. follow these steps

CREATE
alarm[0] = 20

ALARM 0
{
instance_create(x,y,object)
}

now every 20 seconds a instance is created. Now lets try repeating instances

repeat(10)
{
instance_create(x,y,object)
}

this way you have more control of how many you want.

that concludes our Chapter for today.

Thank you for that, I didn't know any code until this...

I'm glad I helped once I fully know code I make a whole thing about it.

yeah this is going to help me make my new upcoming game

CH 3
okay now were going to move to copying functions of off of D&D system. lets start with the TAB "Move"

D&D tab lesson 1
Move

The first thing you see is a red arrow direction cube, this is for moving directions, we have actually already covered this but here is a refreshment.
{
x+=3
speed = 3
}

x+= moving right, change it to x+= -3 and that we'll become moving left. change X to Y to make it up and down.
speed just means what type of speed you want to have, you don't have to do this but it controls it more.

second is a blue direction cube, this may be a little harder but here. ( I don't know if its harder, because I don't know how to do it... )

next is a move towards type of function which in code is this.

{
move_towards_point(x,y,3)
}

3 means the speed that you want the object to move to the point x,y. if you want it to move to a object,
use this

{
move_towards_point(obj_player.x,obj_player.y,3)
}

Now the other two, with the red arrow pointing down and sideways, is simple.

{
hspeed
}
is horizontal speed
{
vspeed
}
is vertical speed.

as a example vspeed can be used for jumping to stop.

here.
if vspeed > 0 && !place_free(x,y+vspeed)
{
move_contact(270)
}
vspeed = 0

this means if vspeed is less than 0 and there is a SOLID at position of vertical vspeed, move towards the object at direction 270 (down) then when it touches it vspeed = 0.

that's a pretty hard code. but an example none the less.

now onto gravity. this one is simple, in step events you to have gravity,
{
gravity = 0.5
gravity_direction = 270
}
meaning the gravity = 0.5 and the direction is down.

that concludes our lesson for now.