Quick questions about Gideros&Lua

oleg

why is the value not 1?

hgy29

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

@hgy29 I realized the sprite was moving

Apollo14

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

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

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

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

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

@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

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

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

antix

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

oleg

Eureka!!
why did not I know about it before?

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

Apollo14

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

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

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

@Apollo14

обрізає

antix

@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

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

@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

@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

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

а ти додав плагін bump в андроід плеєр?

Apollo14

oleg said:

а ти додав плагін bump в андроід плеєр?

I'm testing it on PC player.

oleg

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

hgy29

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

hgy29

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

Apollo14

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

And I'm getting this error:

How to solve it?

SinisterSoft

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

Apollo14

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.