Hello, I’m really getting into the swing of learning Lua and trying to take advantages of the neat little tricks that Corona has waiting to be used.
One of the things I really like is its ability to select the higher-resolution files whenever a @2x (or whatever suffix) is available, but it appears to only be used with display.newImageRect and not display.newImage.
Upon looking closely in ui.lua where I’m implementing my menu buttons, it’s using display.newImage:
[code]---------------
– Button class
function newButton( params )
local button, default, over, size, font, textColor, offset
if params.default then
button = display.newGroup()
default = display.newImage( params.default )
button:insert( default, true )
end
if params.over then
over = display.newImage( params.over )
over.isVisible = false
button:insert( over, true )
end
…
[/code]
I’m trying to change it to default = display.newImageRect( params.default ) but it’s crashing. I believe display.newImageRect requires the dimensions to be passed along with the file, but display.newImage does not.
So, how can I automatically include the dimensions, or what other code do I have to change/implement to make it work? Do I have to manually pass dimensions into the function beforehand?
Thanks in advance. [import]uid: 6084 topic_id: 5859 reply_id: 305859[/import]
You’re using an older version of ui.lua; I’m assuming the version that comes with the sample code (they should really update that.) Best place to get the latest version is in the Ghosts vs Monsters sample. [import]uid: 12108 topic_id: 5859 reply_id: 20128[/import]
Fantastic, it works beautifully!
For those who are just joining us, you can download the Ghost vs. Monsters template here: http://developer.anscamobile.com/assets/ghostsvsmonsters.zip
From there, you need to make the following changes to your app:
local returnSelect = ui.newButton{
defaultSrc = "menuButton.png",
overSrc = "menuButtonOver.png",
defaultX = 298, defaultY = 56, overX = 298, overY = 56,
onEvent = buttonHandler,
id = "mainmenu",
text = "RETURN TO MAIN MENU",
font = "Trebuchet-BoldItalic",
textColor = { 255, 255, 255, 255 },
size = 18, offset = -4,
emboss = true
}
-
default becomes defaultSrc
-
defaultX and defaultY are the image dimensions that must be pre-specified
- optional over becomes overSrc , but if you’re using it, you have to pre-specify the dimensions as well with overX and overY
[import]uid: 6084 topic_id: 5859 reply_id: 20135[/import]
Thanks BTT,
Your addition to the thread has been very helpful! I don’t know why this information isn’t easier to find. And why Ansca keeps throwing old libraries in with sample code… 
[import]uid: 10361 topic_id: 5859 reply_id: 26220[/import]
@BeyondtheTech How do you pre-specify the dimensions? I’ve got this up and running but my button image is squashed. Should I specify them after defaultSrc? Here’s what I’ve got:
local bt01 = ui.newButton{
defaultSrc = "introtitle.png",
overSrc = "introtitleover.png",
defaultX = 160, defaultY = 100, overX = 160, overY = 100,
onEvent = bt01t,
id = "button1",
}
Thanks!
[import]uid: 20687 topic_id: 5859 reply_id: 27974[/import]
Yes, you need to specify the dimensions you want for defaultSrc and overSrc using the defaultX/Y and overX/Y arguments, respectively.
On a side note, you can also specify defaultSrc and overSrc to be the same file, but make the values for overX/Y to be larger than defaultX/Y. That’s one way of showing you’re pressing on the button - it just gets bigger!
Open your png file with Preview to get the original dimensions using Preview’s Inspector feature, then pop in the values and adjust as needed. [import]uid: 6084 topic_id: 5859 reply_id: 27975[/import]
I totally figured it out, thank you!!! I’ve been trying to get these @2x graphics to show up on the iPad simulator for the past 24 hours…and thanks to this thread they are finally in place!
On a related note, what is the “id”? I just put in something as a default answer to what I thought it should be, but is it somehow related to your function when it needs to be identified?
Thanks again man!!! [import]uid: 20687 topic_id: 5859 reply_id: 27977[/import]