Godot 2.1 Notes

godot.py

GODOT

#1. loading resources

 var res = load("res://robi.png") # resource is loaded when line is executed
        get_node("sprite").set_texture(res)

func _ready():
        var res = preload("res://robi.png") # resource is loaded at compile time
        get_node("sprite").set_texture(res)

#use preload when path is constant. it’s more optimal
#use load when path is dynamic 

const Corner = preload("corner.gd")  #load class to use it

func _on_shoot():
        var bullet = preload("res://bullet.scn").instance()
        add_child(bullet)

#spawn object to stage. load scene and call instance() method

#2. paths
path user:// that is always writable.
path res:// point to project resources 


#3. root viewport
get_tree().get_root() # access via scenemainloop #Viewport class
get_node("/root") # access via absolute path #Viewport class

#3a. root scene
get_tree() #top of tree, #SceneTree class

#4. change scene
func _my_level_was_completed():
    get_tree().change_scene("res://levels/level2.scn") 
    #get_tree().change_scene_to(scene_instance) 

#5. curr scene
get_tree().get_current_scene()

#6. collisions
convex - выпуклый (fast)
concave - вогнутый

#7. positions
Spatial -> Transform -> Local ~ get_global_transform().basis (3 X Vector3) + 1XVector3 is origin
		 Transform -> Translation ~ get_global_transform().origin (converted)

#8. area collision listeners

func _on_Area2D_body_enter( body ):
	if body.is_in_group("enemies"):
		queue_free()

func _on_coin_body_enter(body):
	if (not taken and body extends preload("res://player.gd")):
		taken = true

func _on_Area2D_body_enter( body ):
	if body.get_name() == "player":
		queue_free()
		get_node("/root/world").collect_diamond()

#9. extend script from base script
extends "res://enemies/enemy.gd" #in the beginning of file

#10. enable cantacts in rigid body

extends RigidBody2D

func _ready():
	set_contact_monitor( true )
	set_max_contacts_reported( 5 )
	connect("body_enter",self,"collion_now")

#or add area, and collision shape to area, handle body_enter event on area then

#11. animations
one shot - plays one time
mix node - play 2 animation in same time
blend node - smoothly goes from one animation to another
time scale - slowdown/insrease speed of animation
transition - switch between animations
time seek - play animation from new position (useful when need to play anim from first frame)
	# anim_tree.timeseek_node_seek("jump_seek", 0) #params in code only


#12. add class definition 
const Pool = preload("res://com/brandonlamb/pool/pool.gd")
var pool = Pool.new(BULLET_POOL_SIZE, BULLET_POOL_PREFIX, GreenBullet)

#in pool.gd
#define constructor
func _init(size_, prefix_, scene_):


#13. _ready fix
     func _notification(what):
	if (what == NOTIFICATION_INSTANCED):
		#all internal initialization, you can use get_node here to get internal nodes and object will be to some degree usable even if not added yet to scene tree
		#it's called after object construction, at this point object is not even inside scene tree
		#also it's called only once

		#add_hero()
		pass


	elif(what == NOTIFICATION_READY):
		#only parts that are dependent on outside world (on theparents etc/also called when reparented)
		#usually it's quite ok to update external references if object is reparented so it usually works ok without any further thinking
		#load_track(track_file)
		#add_first_bars()
		pass

#14. randi()
randi()%11+1 returns an int from 1 to 10
randf()*11+1 returns a float from 1 to 10
rand_range(1,11) returns a float from 1 to 10
randi()%2 = { 0, 1 } range

#15. cos ( a in radians ) !!!

#16 number functions
print(floor(2.3))  #2
print(floor(2.9)) #2

print(ceil(2.3)) #3
print(ceil(2.9)) #3

print(round(2.3)) #2
print(round(2.9)) #3

#16. tmp folder /Users/boom/.godot/tmp/

#17. dir 
var dir = Directory.new()
if !dir.dir_exists("user://Saves"):
   dir.open("user://")
   dir.make_dir("user://Saves")

#18. dynamic texture

var tex = ImageTexture.new()
var img = Image()
img.load("image.png")
tex.create_from_image(img)

#19. integrate array
for pos in postions:
    #use it 

if not pos in positions:
   positions.append(pos)

#20. compile engine
cd godot-2.1
scons platform=osx bits=64 tools=yes
cp -r misc/dist/osx_tools.app ./Godot.app
mkdir -p Godot.app/Contents/MacOS
cp bin/godot.osx.tools.64 Godot.app/Contents/MacOS/Godot
chmod +x Godot.app/Contents/MacOS/Godot

#21
show file in system file browser
	#var dir = Globals.globalize_path(stream.get_path())
	#dir = dir.substr(0, dir.find_last('/'))
	#OS.shell_open("file://" + dir)

#22
#print from back
for i in range(notes.size()-1, -1, -1):
    print("index:", i, "value:", notes[i])

#23
#bubble sort
	var notes = [7,2,5,1]
	print("notes:", notes)
	for i in range(notes.size()-1, -1, -1):
		print("i:", i)
		for j in range(1,i+1,1):
			print("J:", j)
			if notes[j-1] > notes[j]:
				var temp = notes[j-1]
				notes[j-1] = notes[j]
				notes[j] = temp
	print("sorted notes:", notes)

#24
keyboard and touch display
	if (ie.type == InputEvent.KEY):
		if (Input.is_action_just_pressed("ui_left")):
			vehiclePos[0] = !vehiclePos[0];
		if (Input.is_action_just_pressed("ui_right")):
			vehiclePos[1] = !vehiclePos[1];
	
	if (ie.type == InputEvent.SCREEN_TOUCH && ie.pressed):
		if (ie.x < viewportSize.width/2):
			vehiclePos[0] = !vehiclePos[0];
		if (ie.x > viewportSize.width/2):
			vehiclePos[1] = !vehiclePos[1];

#25
String p_path
p_path.c_str()

#26. scons with verbose info
scons p=iphone tools=no bits=64 target=debug arch=arm64 verbose=yes
#27. scons multi process 
scons platform=x11 tools=no target=debug bits=64 -j 7
#28 scons platform=x11  dev=yes

#29 maybe linux bugfix
What Godot version are you using? If compiling yourself, use `use_static_cpp=yes` when using such a recent GCC version to stay compatible with older system