Quick questions about Gideros&Lua

Apollo14 · December 2017

Hi guys! Few more newbie questions are coming!

#1: How to prevent screen turning off on my Android, while I'm using Gideros Android Player? It's pretty inconvenient to turn it on again and again while I'm testing app. Do I need to set an exception somewhere inside Android OS?

#2: How to regulate animation speed?
I've tried to loop basic animation, but it's too quick by default, I need it slower:

frame1 = Bitmap.new(Texture.new("w1.png"))
frame2 = Bitmap.new(Texture.new("w2.png"))
frame3 = Bitmap.new(Texture.new("w3.png"))
frame4 = Bitmap.new(Texture.new("w4.png"))
frame5 = Bitmap.new(Texture.new("w5.png"))
frame6 = Bitmap.new(Texture.new("w6.png"))
frame7 = Bitmap.new(Texture.new("w7.png"))
frame8 = Bitmap.new(Texture.new("w8.png"))
 
enemyRotate = MovieClip.new{
	{1, 1, frame1},	
	{2, 2, frame2},	
	{3, 3, frame3},	
	{4, 4, frame4},	
	{5, 5, frame5},	
	{6, 6, frame6},
	{7, 7, frame7},
	{8, 8, frame8},
}
 
enemyRotate:setGotoAction(8,1)
enemyRotate:setScale(0.58)
stage:addChild(enemyRotate)

SinisterSoft · December 2017

application:setKeepAwake(true)

Ninjadoodle · December 2017

@SinisterSoft - lol, I was just looking for the same thing

Thanks!

oleg · December 2017

Android:
settings-->Developer Options-->remain active

How to enable Developer Options

Apollo14 · December 2017

Thx, guys!
uh, I found how to make animation slower

I should've been more alert reading reference manual

Apollo14 · December 2017

Hi guys! How to regulate animation speed on the fly?
For example when button is clicked, animation starts playing a little bit faster.
(I don't see in documentation any reference, like "MovieClip:setSpeed" or "MovieClip:increaseSpeed()", etc)

oleg · December 2017

frame1 = Bitmap.new(Texture.new("w1.png"))
frame2 = Bitmap.new(Texture.new("w2.png"))
frame3 = Bitmap.new(Texture.new("w3.png"))
 
 
enemyRotate = MovieClip.new{
	{1, 1, frame1},	
	{2, 2, frame2},	
	{3, 3, frame3},	
 
        {5, 10, frame1},	
	{11, 15, frame2},	
	{16, 20, frame3}	
}
 
 
 
 
function slow()
 
         enemyRotate:setGotoAction(20,5)
           enemyRotate:gotoAndPlay (5)
end
 
 
function fast()
       enemyRotate:setGotoAction(3,1)
       enemyRotate:gotoAndPlay (1)
end
 
fast()

Apollo14 · January 2018

Hi guys!
Why am I getting error here?
function arguments expected near 'then'
What's wrong with syntax?

function MoveOrcGreenX(event)
	if event.x > orcGreen:getX then
	print("Mouse.X coordinate is bigger then orcGreen.X")
	end
end
stage:addEventListener(Event.MOUSE_DOWN, MoveOrcGreenOnX)

hgy29 · January 2018

Shouldn't it be:

function MoveOrcGreenX(event)
	if event.x>orcGreen:getX() then
	print("Mouse.X coordinate is bigger then orcGreen.X")
	end
end

keszegh · January 2018

what is ";" for in this code?

Apollo14 · January 2018

keszegh said:
what is ";" for in this code?

forum's little bug
I meant in my post:
if event.x "is bigger than" orcGreen:getX()

oleg · January 2018

this is a protection from SQL injection, replaces dangerous characters

Apollo14 · January 2018

Guys! Why does my spite shake and how to avoid it?

function MoveOrcGreenX()
	local touchXloc = touchX
	if orcGreen:getX() > touchXloc
	then
	orcGreen:setX(orcGreen:getX() - 3)
	elseif orcGreen:getX() < touchXloc then
	orcGreen:setX(orcGreen:getX() + 3)
	end
end
stage:addEventListener(Event.ENTER_FRAME, MoveOrcGreenX)

talis · January 2018

/joke on
@Apollo14 look at him he is obviously on steroids, totally green so his shaking is normal:D
\joke off

If you want to move your sprite better move him with touch event(touch start, touch end) not on enter frame event, i guess after your move finish your orc is changing his place +3 and -3 respectively on every frame, because of it he is shaking.

if you want to continue to move him on enter frame you can make a check value in your touch end event like moving= false , and use this check variable on your onenter frame event in the logical statements. So you will be sure that your green orc will not move anywhere even on steroids:D

oleg · January 2018

function speed_move(sprite,x2,y2,speed)
        speed=speed/1000*60  --60fps
        x1, y1 = sprite:getPosition()
 
        sprite.move = MovieClip.new{
                        {1, speed, sprite, {x = {x1, x2, "linear"},y = {y1, y2, "linear"}}}  
                }
        sprite.move:gotoAndPlay(1)
end
 
speed_move(orcGreen,touchX,orcGreen:getY(),50)

Apollo14 · January 2018

thx @talis & @oleg !
Though it's not a proper way to move my steroid orc with ENTER_FRAME, I wonder how to avoid shaking with boolean "isMoving:?
I introduced boolean but it still shakes

function MoveOrcGreenX()
	local touchXloc = touchX
	local isMoving = false
 
if isMoving == false then
	if orcGreen:getX() > touchXloc
	then
	 isMoving = true
	 orcGreen:setX(orcGreen:getX() - 3)
	 orcGreen:setScaleX(-1)
	 isMoving = false
 
	elseif orcGreen:getX() < touchXloc then
	 isMoving = true
	 orcGreen:setX(orcGreen:getX() + 3)
	 orcGreen:setScaleX(1)
	 isMoving = false
	end
end
end --function end
stage:addEventListener(Event.ENTER_FRAME, MoveOrcGreenX)

oleg · January 2018

elseif orcGreen:getX() < touchXloc then
	 isMoving = true
if touchXloc-orcGreen:getX()<3  then 
 
 orcGreen:setX(touchXloc)
else
	 orcGreen:setX(orcGreen:getX() + 3)
end
	 orcGreen:setScaleX(1)
	 isMoving = false
	end</pre>

Apollo14 · January 2018

I have 4 scenes.
On mouse clicked if current scene is 1, then go to scene 2
On mouse clicked if current scene is 2, then go to scene 3
On mouse clicked if current scene is 3, then go to scene 4
On mouse clicked if current scene is 4, then go back to scene 1

Can this code be optimized?

currentScene = 1
function onMouseDownFunc()
	if currentScene ==1 then
	sceneManager:changeScene("scene2", 1, SceneManager.fade)
	currentScene = 2
	elseif currentScene ==2 then
	sceneManager:changeScene("scene3", 1, SceneManager.fade)
	currentScene = 3
	elseif currentScene ==3 then
	sceneManager:changeScene("scene4", 1, SceneManager.fade)
	currentScene = 4
	elseif currentScene ==4 then
	sceneManager:changeScene("scene1", 1, SceneManager.fade)
	currentScene = 1
	end
end
stage:addEventListener(Event.MOUSE_DOWN, onMouseDownFunc)

hgy29 · January 2018

currentScene = 1
function onMouseDownFunc()
	local nextScene=(currentScene%4)+1
	sceneManager:changeScene("scene"..nextScene, 1, SceneManager.fade)
	currentScene = nextScene
end
stage:addEventListener(Event.MOUSE_DOWN, onMouseDownFunc)

Apollo14 · January 2018

@hgy29 nice optimization thx!

I'm in the process of studying Scene Manager...
Why I'm getting an error here? I've read @ar2rsawseen 's post, tried to do somewhat similar

Scene2 = Core.class(Sprite)
 
function Scene2:init()
	local sprite2 = Bitmap.new(Texture.new("sprite2.png"))
	sprite2:setScale(0.7)
	sprite2:setAnchorPoint(0.5,0.5)
	sprite2:setPosition(centrX, centrY)
	self:addChild(sprite2)
 
    self:addEventListener("enterEnd", self.onEnterEnd, self)
end
 
function Scene2:onEnterEnd()
    print("scene fully entered")
end

scenes/Scene2.lua:10: attempt to index global '    self' (a nil value)
stack traceback:
	scenes/Scene2.lua:10: in function 'init'
	[string "property.lua"]:52: in function '__new'
	[string "property.lua"]:59: in function 'new'
	scenemanager.lua:287: in function 'changeScene'
	main.lua:23: in function

hgy29 · January 2018

lua should say the variable is 'self', not ' self' (with the extra spaces before the name).
Maybe your file contains some blank characters (not spaces or tabs) before the self:addEventListener(). It could have happened if you copied/pasted the code from a web page.

Apollo14 · January 2018

hgy29 said:
lua should say the variable is 'self', not ' self' (with the extra spaces before the name).
Maybe your file contains some blank characters (not spaces or tabs) before the self:addEventListener(). It could have happened if you copied/pasted the code from a web page.

Thanks a lot! Indeed there was a blank character somewhere. After rewriting code it works fine!

Apollo14 · January 2018

Guys! How to visualize swipe gesture?
I'm trying to spawn black pixels continuously while swiping, but they spawn only once.

First I've created class "dot.lua":

Dot = Core.class(Sprite)
 
function Dot:init()
	local blackPixel = Pixel.new(0x000000, 1, 4, 4)
	self:addChild(blackPixel)
	--Pixels should disappear after 500ms:
	local timerDelayed = Timer.delayedCall(500, function()
	self:removeChild(blackPixel)
	end)
end

Inside "main.lua" I added:

function onMouseDownFunc(event)
	touchX, touchY = event.touch.x, event.touch.y
 
	stage:addEventListener(Event.ENTER_FRAME, function()
	local locDot = Dot.new()
	locDot:setPosition(touchX, touchY)
	stage:addChild(locDot)
	end)
 
end
 
function onTouchesEndFunc(event)
	--
end
 
stage:addEventListener(Event.TOUCHES_BEGIN, onMouseDownFunc)
stage:addEventListener(Event.TOUCHES_END, onTouchesEndFunc)

oleg · January 2018

use Event.TOUCHES_MOVE

use partikles

http://docs.giderosmobile.com/reference/gideros/Particles/addParticles#Particles:addParticles

Apollo14 · January 2018

thx @oleg
I've tried Event.TOUCHES_MOVE, now effect became better, but there are lots of interruptions on the line: http://giderosmobile.com/forum/uploads/editor/8j/mg4jef8se8g1.gif

I've found @atilim 's "Fruit Ninja" old prototype on forum: http://giderosmobile.com/forum/discussion/1214/fruit-ninja-template-who-wants-to-contribute-with-me/p1

He did it using shape. Does somebody know if there is a less complicated way to do it?

local shape = Shape.new()
stage:addChild(shape)
 
local x, y
 
local xs = {}
local ys = {}
local ss = {}
 
function onMouseDown(event)
	x,y = event.x,event.y
end
 
function onMouseMove(event)
	x,y = event.x,event.y
end
 
function onMouseUp()
	x,y = nil,nil
end
 
function onEnterFrame()
	if x and y then
		xs[#xs + 1] = x
		ys[#ys + 1] = y
		ss[#ss + 1] = 10
	end
 
	while #ss > 0 and ss[1] <= 1 do
		table.remove(xs, 1)
		table.remove(ys, 1)
		table.remove(ss, 1)
	end
 
	shape:clear()
	for i=1,#xs-1 do
		shape:setLineStyle(ss[i], 0x8080ff)
		shape:beginPath()
		shape:moveTo(xs[i], ys[i])
		shape:lineTo(xs[i+1], ys[i+1])
		shape:endPath()
	end
 
	for i=1,#ss do
		ss[i] = ss[i] - 1
	end
 
	if #ss > 0 then
		local x2 = xs[#ss]
		local y2 = ys[#ss]
 
		for i=#ss-1, 1, -1 do
			local x1 = xs[i]
			local y1 = ys[i]
 
			local d = (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)
			if d > 10 then
				split(x1, y1, x2, y2)
			end			
		end
	end
end

oleg · January 2018

Apollo14 said:
thx @oleg
I've tried Event.TOUCHES_MOVE, now effect became better, but there are lots of interruptions on the line:

variant1:
save the coordinates of the previous point
find the distance between the points math.sqrt((X1-X2)^2+(Y1-Y2)^2)
generate additional points between them
variant2:
points to connect lines

variant3:
see the screenshot

antix · January 2018

@oleg has the right suggestion I think

Apollo14 · January 2018

I see that macro constants are available since 2017.10: http://docs.giderosmobile.com/reference/enhancement/macroconstants

Is it a good practice to use them whenever we can? How do they affect perfomance?

totebo · February 2018

They're FAST. I use them whenever I can.

SinisterSoft · February 2018

They improve performance by not having to look up the variable in a table and also because the byte compiler will pre-calculate formulas if it can so constants will end up being part of that precalculation but variable won't.

eg
local pi=3.142
a=pi*2

will compile into that in bytecode as it can't reduce it because pi is a variable and could change.

but
@pi=3.142
a=pi*2

will compile to this in bytecode
a=6.284

because the compiler will first make it a=3.142*2 then further reduce this to 6.284 before making the bytecode.

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