Quick questions about Gideros&Lua

oleg · July 2018

why is the value not 1?

hgy29 · July 2018

Hard to tell without knowing the transform applied, but it should be 1 if you had passed xx,yy. What is the value of yy in your case ?

oleg · July 2018

@hgy29 I realized the sprite was moving

Apollo14 · July 2018

Guys, I don't get why my particles are not shown after tap?
update: I didn't add them to stage LOL

myStars=Particles.new()
 
local function spawnStar(event)
	myStars:setPosition(event.x,event.y)
	myStars:addParticles({{ x=event.x,y=event.y,size=5,color=0xc0392b,ttl=200,speedX=2,speedY=2,decay=1.04 }})
end
stage:addEventListener(Event.MOUSE_DOWN,spawnStar)

Apollo14 · July 2018

Guys, how to make classic smooth jump, that depends on how long we are holding the button?
I'm experimenting with enterframe, but my jump height is fixed.

function hero:init()
	self.isJumping=false
	self.jumpSpeed=4
	self.gravityPower=0.1
 
	self:addEventListener(Event.ENTER_FRAME, function()
		if self.isJumping then
		self:setY(self:getY()-self.jumpSpeed)
		self.jumpSpeed-=self.gravityPower
 
		if self.jumpSpeed<=-4 then self.isJumping=false; self.jumpSpeed=4; self:setY(self.origY)
		end
 
		end
	end)
end
 
function hero:jump()
if self.isJumping==false then
	self.isJumping=true
	self.jumpSpeed=4
	self.origY=self:getY()
end
end</pre>

oleg · July 2018

scales=0.9 --підібрати експериментально
 
--TOUCHES_BEGIN 
if not isJumping  then
  tm= os.timer()
end
 
--TOUCHES_END 
if not isJumping  then
  tm=os.timer()-tm
  jumpSpeed=tm*scales
  isJumping=true
end
 
--ENTER_FRAME
if isJumping then
   playerY += jumpSpeed 
   jumpspeed -= gravityPower 
end
 
--collision
isJumping =nil

antix · July 2018

probably something like..

Hero = Core.class(Pixel)
 
function Hero:init(color, alpha, width, height)
  self:setAnchorPoint(0.5, 1.0)
  self:setPosition(160, 32)
 
  self.position = {x = 160, y = 32}
  self.velocity = {x = 0, y = 0}
  self.gravity = {x = 0, y = 960}
 
  self.jumping = false
end
 
function Hero:jump() -- set hero jumping
  if not self.jumping then
    self.jumping = true
    local g = self.gravity
    g.y = -2000
  end
end
 
function Hero:fall() -- set hero falling
    local g = self.gravity
    g.y = 960
end
 
function Hero:ground() -- set hero grounded
  self.jumping = false
end
 
function Hero:update(dt)
  local p, v, g = self.position, self.velocity, self.gravity
  local gy = g.y
  local vy = v.y + gy * dt
  local y = p.y + vy * dt
  if y >= 480 - 32 then -- stop hero falling out of world
    y = 480 - 32
    vy = 0
    self:ground()
  elseif y <= 32 then -- stop hero jumping out of world
    y = 32
    vy = 0
  end
  v.y = vy
  p.y= y
  self:setY(y)
end
 
local hero = Hero.new(0x44aa88, 1, 32, 32)
 
-- update every frame
local function onEnterFrameFunc(e)
  local dt = e.deltaTime
  hero:update(dt)
end
 
local function onTouchBegin(e)
  e:stopPropagation()
  hero:jump()
end
 
-- set hero falling
local function onTouchEnd(e)
  e:stopPropagation()
  hero:fall()
end
 
stage:addEventListener(Event.TOUCHES_BEGIN, onTouchBegin)
stage:addEventListener(Event.TOUCHES_END, onTouchEnd)
stage:addEventListener(Event.ENTER_FRAME, onEnterFrameFunc)
 
stage:addChild(hero)

That should work

antix · July 2018

Very odd.. when I look at my reply my code is truncated and I cannot see it in its entirety

Do others see the entire code above or is it truncated at 'elseif y'??

Here it is in plain text..

Hero = Core.class(Pixel)

function Hero:init(color, alpha, width, height)
self:setAnchorPoint(0.5, 1.0)
self:setPosition(160, 32)

self.position = {x = 160, y = 32}
self.velocity = {x = 0, y = 0}
self.gravity = {x = 0, y = 960}

self.jumping = false
end

function Hero:jump() -- set hero jumping
if not self.jumping then
self.jumping = true
local g = self.gravity
g.y = -2000
end
end

function Hero:fall() -- set hero falling
local g = self.gravity
g.y = 960
end

function Hero:ground()
self.jumping = false
end

function Hero:update(dt)
local p, v, g = self.position, self.velocity, self.gravity
local gy = g.y
local vy = v.y + gy * dt
local y = p.y + vy * dt
if y >= 480 - 32 then -- stop hero falling out of world
y = 480 - 32
vy = 0
self:ground()
elseif y <= 32 then -- stop hero jumping out of world
y = 32
vy = 0
end
v.y = vy
p.y= y
self:setY(y)
end

local hero = Hero.new(0x44aa88, 1, 32, 32)

-- update every frame
local function onEnterFrameFunc(e)
local dt = e.deltaTime
hero:update(dt)
end

local function onTouchBegin(e)
e:stopPropagation()
hero:jump()
end

-- set hero falling
local function onTouchEnd(e)
e:stopPropagation()
hero:fall()
end

stage:addEventListener(Event.TOUCHES_BEGIN, onTouchBegin)
stage:addEventListener(Event.TOUCHES_END, onTouchEnd)
stage:addEventListener(Event.ENTER_FRAME, onEnterFrameFunc)

stage:addChild(hero)

talis · July 2018

@antix it is truncated at 'elseif y' .
Edit:
< pre lang="lua"> < /pre> is not working. It is making the code whole again but in yellow format without highligt.
< code> tag is also seems to be the same not working as it should work.

talis · July 2018

It is funny indeed because when i try to edit your comment i saw the whole code, but when i close and return again truncated. So it is obvious something wrong with < pre > command.

hgy29 · July 2018

It happens when you have a > symbol in your code, it is seen as a closing tag

antix · July 2018

@hgy29 oh, that's pretty bad when you want to have a code block. code without less than heheh

oleg · July 2018

Eureka!!

why did not I know about it before?

minX,minY,maxX,maxY=application:getLogicalBounds()
stage:setClip(minX, minY, maxX-minX, maxY-minY)

Apollo14 · July 2018

oleg said:
Eureka!!
why did not I know about it before?
minX,minY,maxX,maxY=application:getLogicalBounds()
stage:setClip(minX, minY, maxX-minX, maxY-minY)

what does it do?

hgy29 · July 2018

antix said:
@hgy29 oh, that's pretty bad when you want to have a code block. code without less than heheh

Agreed, I wasn’t aware of it until yesterday. I will fix that next week.

Apollo14 · July 2018

Can somebody please share quick example how to use Bump.lua? (I didn't find any examples)

local pix1,pix2=Pixel.new(0x34ace0,1,24,24),Pixel.new(0x218c74,1,24,24)
stage:addChild(pix1); stage:addChild(pix2); pix2:setX(400)
 
stage:addEventListener(Event.ENTER_FRAME, function()
	pix1:setX(pix1:getX()+1); pix2:setX(pix2:getX()-1)
end)

Do we need Bump only for rectangle collision detection, there's nothing else?

p. s. Why not just use function instead of Bump?

function checkCol(sprite1,sprite2)
	local x,y,w,h = sprite1:getBounds(stage)
	local x2,y2,w2,h2 = sprite2:getBounds(stage)
	return not ((y+h < y2) or (y > y2+h2) or (x > x2+w2) or (x+w < x2))
end

oleg · July 2018

@Apollo14

обрізає

antix · July 2018

@Apollo14.. https://github.com/kikito/bump.lua that's the original documentation

If you have 10 collision rectangles in your game then just use whatever but if you start to get a lot of collision rectangles bump is what you should use because it's fast and efficient and provides some in built collision responses.

Apollo14 · July 2018

antix said:
@Apollo14.. https://github.com/kikito/bump.lua that's the original documentation

I didn't understand their documentation.
Can you pls share a quick code example for Gideros, from where to start?

antix · July 2018

@Apollo, the documentation for bump is very good IMHO and not too hard to grasp

Anyhoo.. There was an interesting thread a while ago and I mashed a load of collision related stuff into it..

http://giderosmobile.com/forum/discussion/6353/collision-with-any-object/p1

oleg · July 2018

@Apollo14
--для платформера достатньо цього

Creating a world
local world = bump.newWorld

Adding items to the world
world:add(item, x,y,w,h)

Moving an item in the world, with collision resolution
local actualX, actualY, cols, len = world:move(item, goalX, goalY, )

Apollo14 · July 2018

Why does this line cause an error? How to make it work? (I've added Bump to project's plugin list, I'm using latest Gideros version)

local world=require("bump").newWorld() --causes error
local world=bump.newWorld() --causes error too

lvls/lvl1.lua:44: module 'bump' not found:
no field package.preload['bump']
no file '.\bump.lua'
no file '.\bump\init.lua'
no file '.\_LuaPlugins_\bump.lua'
no file '.\_LuaPlugins_\bump\init.lua'
no file 'C:\Program Files (x86)\Gideros\lua\bump.lua'
no file 'C:\Program Files (x86)\Gideros\lua\bump\init.lua'
no file 'C:\Program Files (x86)\Gideros\bump.lua'
no file 'C:\Program Files (x86)\Gideros\bump\init.lua'
no file '.\bump.dll'
no file 'C:\Program Files (x86)\Gideros\bump.dll'
no file 'C:\Program Files (x86)\Gideros\loadall.dll'
stack traceback:
lvls/lvl1.lua:44: in function 'init'
[string "property.lua"]:52: in function '__new'
[string "property.lua"]:59: in function 'new'
classes/scenemanager.lua:274: in function 'changeScene'
main.lua:13: in main chunk

All these dll/lua files usually have to be added to the folder manually? Or it is a little bug in Gideros' installation package?

oleg · July 2018

а ти додав плагін bump в андроід плеєр?

Apollo14 · July 2018

oleg said:
а ти додав плагін bump в андроід плеєр?

I'm testing it on PC player.

oleg · July 2018

спробуй додати цей файл https://github.com/MultiPain/gideros-platformer/blob/master/bump.lua

hgy29 · July 2018

If you want to use the native bump plugin, use require “cbump”

hgy29 · July 2018

I changed the syntax highlighting code, hopefully code/pre blocks are now correctly rendered.

Apollo14 · July 2018

Guys I'm trying to export blank Gideros Player with all these plugins:

And I'm getting this error:

How to solve it?

SinisterSoft · July 2018

It looks like google have taken play services 12.0.1 offline. Try 11.0.0 ?

Apollo14 · July 2018

SinisterSoft said:
It looks like google have taken play services 12.0.1 offline. Try 11.0.0 ?

Thanks, now I've tried 11.0.4.
But there is next error. Some files are missing in the project folder.

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