I am trying to trigger a hide and a show on my table local starTable = {}
local starTable = {} -- Set up star table
local function showStarTable()
-- some trigger to show the star table
end
timer.performWithDelay( 500, showStarTable, 1 )
local function hideStarTable()
-- some trigger to hide the star table
end
timer.performWithDelay( 1000, hideStarTable, 1 )
Is it possible to achieve this
To go along with the first answer here is an example:
local starTable = {}
local star1 = <display object>
starTable:insert(star1)
local function showStarTable()
starTable.alpha = 1
end
timer.performWithDelay( 500, showStarTable, 1 )
local function hideStarTable()
starTable.alpha = 0
end
timer.performWithDelay( 1000, hideStarTable, 1 )
Or of you wanted to stick with an actual table. and without seeing what actually is inserted into your starTable you could try:
local starTable = {}
local star = <display object>
starTable[1] = star
star = <display object>
starTable[2] = star
star = <display object>
starTable[3] = star
local function showStarTable()
for i=1, #starTable do
starTable[i].star.alpha = 1
end
end
timer.performWithDelay( 500, showStarTable, 1 )
local function hideStarTable()
for i=1, #starTable do
starTable[i].star.alpha = 0
end
end
timer.performWithDelay( 1000, hideStarTable, 1 )
However, the first option is better, if it works with your program.
Your code will execute the function showStarTable() after 1/2 second for 1 time. Then in another 1/2 second, it will execute hideStarTable() once.
Display objects like display.newImageRect() are tables, so if that's the table you are referring to, you can show/hide them by changing either the .alpha property of the object or it's visibility (.isVisible = true or .isVisible = false). However tables by themselves are just containers of information and a generic table isn't displayable. It could contain a single display object ore multiple.
It would be your responsibility in your show/hide functions to show/hide the contents of the table, if the table has displayable content.
Related
My goal is to create a script that warns when you are disenchanting a piece you don't want. When disenchanting an item straight from inventory, I could use the UseInventoryItem() API. Since UseInventoryItem() seems to work only on inventory slot right click, I created this script, based on GetMouseFocus() API, that works with the original interface of the game: but if someone used an addon, would it still work?
Of course, better solutions are welcome
local mt = {
__index = {
isvalue = function(t, value)
local is = false
for k, entry in ipairs(t) do
if (entry == value) then
is = true
break
end
end
return is
end
}
};
local protected = { "item1", "item2", "item3", "etch." }; -- items I want to protect
setmetatable(protected, mt);
local disenchanting;
local antidisenchant = CreateFrame("Frame");
antidisenchant:RegisterEvent("UNIT_SPELLCAST_SENT");
antidisenchant:SetScript("OnEvent", function(self, event, ...)
if (event == "UNIT_SPELLCAST_SENT") then
if (arg2 == "Disenchant") then
disenchanting = true
end
end
end);
antidisenchant:SetScript("OnUpdate", function()
if GetMouseFocus() then -- GetMouseFocus() returns the frame that currently has mouse focus.
local TargetItemID = GetInventoryItemID("player",GetMouseFocus():GetID()) -- The IDs of each inventory slot frame have the same id as the slot (16 for main hand, 17 for off hand etc.).
if (TargetItemID) and (string.find(GetMouseFocus():GetName(),"Slot")) then -- Inventory slot frame are named like "CharacterMainHandSlot".
local name, link = GetItemInfo(TargetItemID)
if (disenchanting) and (protected:isvalue(name)) then
DEFAULT_CHAT_FRAME:AddMessage("WARNING! YOU'RE DISENCHANTING "..link,1,0,0)
end
end
end
end)
As stated in the title I would like to not only call an object from an external Lua file, but I would also like to group:insert() this object into my Menu page with the properties given to it in the external lua file. Is this possible and/or efficient? I would just really like to make sure data isn't repeated through out my project.
EDIT
Here's my code so far:
The group:insert() function is throwing me an error stating it was expecting a table and that I might have been trying to call a function in which case i should use ":" instead of "."
This is menu.lua:
local storyboard = require( "storyboard" )
local scene = storyboard.newScene()
local widget = require "widget"
local m = require ("myData")
local menuFunction = require("menuFunction")
local menuSwipe
-- =======================
-- menuSwipe()
-- =======================
menuSwipe = function(self, event)
local phase = event.phase
local touchID = event.id
if(phase == "began") then
elseif(phase == "moved") then
elseif(phase == "ended" or phase == "cancelled") then
if(m.menuActivator > 0) then
menuDown(m.invisiBar, event)
else
--m.layerInfo = layers
transition.to( menuFunction.menuBar, { x = menuFunction.menuBar.x, y = 0, time = 200 } )
--transition.to( layers, { x = menuFunction.menuBar.x, y = h, time = 100 } )
m.invisiBar = display.newRect( 0,0,w,25,6)
m.invisiBar.alpha = 0
m.menuActivator = 1
end
end
end
-- ++++++++++++++++++++++
-- menuDown()
-- ++++++++++++++++++++++
function menuDown(self, event)
local phase = event.phase
local touchID = event.id
if(phase == "began") then
elseif(phase == "moved") then
elseif(phase == "ended" or phase == "cancelled") then
if(m.menuActivator == 1) then
transition.to( menuFunction.menuBar, { x = m.menuInfo.x, y = h*.964, time = 200 } )
--transition.to( group, { x = 0, y = 0, time = 10 } )
m.menuActivator = 0
end
end
end
function scene:createScene( event )
local group = self.view
group:insert( menuFunction.menuBar ) -- *** ERROR occurs here
end
function scene:enterScene( event )
local group = self.view
end
function scene:exitScene( event )
local group = self.view
end
function scene:destroyScene( event )
local group = self.view
end
scene:addEventListener( "createScene", scene )
scene:addEventListener( "enterScene", scene )
scene:addEventListener( "exitScene", scene )
scene:addEventListener( "destroyScene", scene )
return scene
This is menuFunction.lua:
local m = require("myData")
local menu = require ("menu")
local w = display.contentWidth
local h = display.contentHeight
local menuFunction = {}
--menuBar
menuFunction.menuBar = display.newImage( "images/menuBar1.png")
menuFunction.menuBar.x = w*(1/2)
menuFunction.menuBar.y = h*1.465
menuFunction.menuBar.height = h
menuFunction.menuBar:setReferencePoint(display.TopLeftReferencePoint)
menuFunction.menuBar.touch = menu.menuSwipe
menuFunction.menuBar:addEventListener("touch", menuFunction.menuBar)
return menuFunction
This is the exact error message:
ERROR: table expected. If this is a function call, you might have used '.' instead of ':'
message**
Does this happen every time this code is called, or does it by any chance work the first time and then crashes? In your case, code could work the first time you enter the scene, but the second time you do, it may crash [if you remove scenes in between].
When you do a 'require' of a file, its contents are executed and returned value is saved in the global packages table. When you require the same file again, the returned value is taken from the global packages table instead, the code is not executed again.
So if you by any chance require this file in one spot of your app, and then call :removeSelf() and nil the reference of the menuBar, the display object will be removed and its reference will cease to exist, and calling the require again, will not recreate the object. Fully removing a scene will also remove the display objects.
So what you wanted to achieve is very sensible [contrary to what #Schollii says], but your "module" should allow creation of multiple objects if you want to get rid of them during runtime.
I'm not going to correct your code, just a simple example of how you can achieve this:
-- menu.lua
local menuCreator = {}
menuCreator.newMenu = function(params)
local menu = display.newGroup()
-- create your menu here
return menu
end
return menuCreator
Now anytime you do:
local menuCreator = require("menu.lua")
you will be able to call:
local menu = menuCreator.newMenu(someParams)
and get yourself a nice new menu wherever you need.
If it's not shown all the time on screen, it may be better to create a new one whenever you need it, and then remove it from the memory.
There are several issues with this, and none of them seem related to your error but fixing them will either also fix the error or make the cause of the error more obvious. Please fix following and update:
Although Lua allows it, don't use circular includes, where A includes B which includes A. Instead have menu require menuFunction and then call a creation function in menuFuntion:
-- menuFunction.lua
local m = require("myData")
-- require("menu") -- BAD! :)
local w = display.contentWidth
local h = display.contentHeight
local menuBar = display.newImage( "images/menuBar1.png")
menuBar.x = w*(1/2)
menuBar.y = h*1.465
menuBar.height = h
menuBar:setReferencePoint(display.TopLeftReferencePoint)
local menuFunction = { menuBar = menuBar }
function createMenuBar(menuSwipe)
menuFunction.menuBar.touch = menuSwipe
menuFunction.menuBar:addEventListener("touch", menuFunction.menuBar)
return menuFunction
end
-- menu.lua
function createScene(event)
local mf = require('menuFunction')
mfFunction = mf.createMenuBar(menuSwipe)
group:insert(menuFunction.menuBar)
end
Secondly out of the four calls to group:insert() the first 3 refer to objects that are not shown in the code and don't see relevant to problem, they should be removed or if you think relevant, comment why their code now shown, or show their code.
What is the best way to remove all spawned coins when the game is over?
Here is the code that spawns the coins:
screenGroup = self.view
coin = {}
coinspawn = function()
i = display.newSprite( imageSheet1, sequenceData1 )
i.x = display.contentWidth
i.y = math.random(0, display.contentHeight-50)
i:play()
i.collided = true
i.name = "coin"
physics.addBody(i, "dynamic",
{density=.1, bounce=0.1, friction=.2, shape= shape2 ,filter=playerCollisionFilter }
)
--player.gravityScale = 0.5
coinIntro = transition.to(i,{time=2500, x=display.contentWidth - display.contentWidth -500 ,onComplete=jetReady , transition=easing.OutExpo } ) --
coin[#coin+1] = i
end
tmrcoin = timer.performWithDelay( 1000, coinspawn, 0 )
First you would remove all coins from the display. Then you would clear the coin table:
for i=1,#coin do
coin[i]:removeSelf()
end
coin = {} -- forget all coins
Assuming coin table is the only other place you store your coins, this will do it.
Note that you can't use coin[i]=nil in the loop after removeSelf: as soon as table has holes, the # operator is basically unusable. You can't use table.remove either, because i gets incremented every time, so you'll miss items (try, you'll see). Same issue with pairs: you can't edit a table while iterating through it. You could however do this:
local numCoins = #coin
for i=1,numCoins do
coin[i]:removeSelf()
coin[i]=nil
end
-- now coin is {}
The only reason I can think of to nil N items instead of letting the gc take care of it with one table = {} statement is if you have more than one reference to your coin table (which I would rename to coins, BTW, for clarity).
How do I update or manipulate a sprite nested in several groups?
I first tried to add the "enterFrame" event directly to the desired class with the sprite (without success)
My code
local box = {}
-- PUBLIC FUNCTIONS
function box:new( )
local group = display.newGroup()
local image = display.newImage("crate.png")
group:insert(image)
function group:update()
image.rotation = image.rotation + 1
end
return group
end
return box
Second I though of adding a
Runtime:addEventListener("enterFrame", enterFrame)
in my scene, then looping through the groups added to the scene (scene.view) and call a custom update-function there that sends the update forward until it reaches my class. However I have not found a way of checking if the group has a update method or not. Now I just call update even if the group does not have it.
function enterFrame (event)
local group = scene.view
for i=1,group.numChildren do
group[i]:update()
end
end
local box = {}
You can try this simple solution
-- PUBLIC FUNCTIONS
function box:new( )
local group = display.newGroup()
local image = display.newImage("crate.png")
group:insert(image)
group.isThereUpdate = true
// or group.isThereUpdate = false
function group:update()
image.rotation = image.rotation + 1
end
return group
end
return box
function enterFrame (event)
local group = scene.view
for i=1,group.numChildren do
if group[i].isThereUpdate then
group[i]:update()
end
end
end
i have a problem (obviusly :P)
i'm create a mini game, and when i touch a Object-A , creates an Object-B.
If i touch N times, this create N Object-B.
(Object-B are Bubbles in my game)
so, i try when I touch the bubble (object-B), that disappears or perform any actions.
I try adding Object-B to Array
local t = {}
.
.
.
bur = display.newImage("burbuja.png")
table.insert(t,bur)
and where i have my eventListeners i wrote:
for i=1, #t do
bur[i]:addEventListener("tap",reventar(i))
end
and my function 'reventar'
local function reventar (event,id)
table.remove(t,id)
end
i'm lost, and only i want disappears the bubbles.
you're probably gonna want to do something like this:
local t = {}
bur = display.newImage("burbuja.png")
table.insert(t,bur)
-- declaring the function first so it can be used later in the for loop
local function reventar(event)
t[event.target.id] = nil -- We remove object from table
event.target:removeSelf() -- Also remember to remove from display
end
for i=1,#t do
t[i].id = i
t[i]:addEventListener("tap", reventar)
end
Hope this helps.
EDIT
I would do it this way, because it's better when you want to loop through the objects:
local t = {}
-- declaring the function first so it can be used later
local function reventar(event)
event.target.kill = true -- Mark the clicked object for later destruction
end
bur = display.newImage("burbuja.png")
bur:addEventListener("tap", reventar)
table.insert(t,bur)
local function loop(event)
for i = #t, 1, -1 do
local object = t[i]
-- Do stuff to object here, such as object.y = object.y + 1
if object.kill then -- Check if object is marked for destruction
local child = table.remove(t, i) -- Remove from table
if child ~= nil then
-- Remove from display and nil it
child:removeSelf()
child = nil
end
end
end
end
Runtime:addEventListener("enterFrame", loop) -- Remember to remove this when no longer needed