Roku Developer Program

[develephant]

Hello,

I hope I can phrase this question properly. First, some XML for reference:

In "pkg:/assets/sprite.map.xml":

<DefenderBitmapSet>

	<Bitmap name="gameTiles" filespec="pkg:/assets/tiles.png">
		<Region name="selectedTile" x="00" y="00" w="32" h="32"/>
		<Region name="defaultTile" x="32" y="00" w="32" h="32"/>
	</Bitmap>

</DefenderBitmapSet>

And the main brs code:

Library "v30/bslDefender.brs"

Function Main ()

	app = { }
	app.tiles = GetGameTiles()

	Print app.tiles.bitmapset.regions

End Function

Function GetGameTiles () As Object

	tiles = { }
	tiles.bitmapset = dfNewBitmapSet(ReadAsciiFile("pkg:/assets/sprite.map.xml"))

	Return tiles

End Function

Running the code, everything seems fine so far:

Output:

------ Running ------
dfNewBitmapSet: no <Background> tag in BitmapSet
gameTiles: <Component: roRegion>
gameTiles.defaultTile: <Component: roRegion>
gameTiles.selectedTile: <Component: roRegion>

But when I try to access the region with...

Print app.tiles.bitmapset.regions.gameTiles.defaultTile

I get an error thrown...

Output:

Current Function:
003: Function Main ()
004:
005:    app = { }
006:    app.tiles = GetGameTiles()
007:
008:    Print app.tiles.bitmapset.regions.gameTiles.defaultTile
009:
010: End Function
Syntax Error. (runtime error &h02) in ...rpANq/pkg:/source/appMain.brs(8)

008:    Print app.tiles.bitmapset.regions.gameTiles.defaultTile
Backtrace:
Function main() As
   file/line: /tmp/plugin/BBBA...rpANq/pkg:/source/appMain.brs(8)

Local Variables:
global   &h0020 rotINTERFACE:ifGlobal
m        &h0010 bsc:roAssociativeArray, refcnt=2
app      &h0010 bsc:roAssociativeArray, refcnt=1

Shouldn't I be getting an roRegion traced? I've use the XML file with animation tags successfully before, so I assumed I could just use a single bitmap and use the regions with the NewSprite command instead of NewAnimatedSprite. Is that not possible? Do I need to have a separate bitmap tag for each?

I'm putting together a development tutorial, so any help appreciated. Thanks in advance.

-dev

[RokuJoel]

My first guess is that your regions might be out of bounds of the actual size of the image you are working with and thus is returning Invalid. Otherwise, can you print out all the parts of app.tiles, like:

Print app.tiles

?app.tiles.bitmapset

?app.tiles.bitmapset.regions.gameTiles

That will give you an idea of what the value is that is triggering the error.

[TheEndless]

I believe the format for accessing sub-regions is:

app.tiles.bitmapset.regions["gameTiles.defaultTile"]

instead of

app.tiles.bitmapset.regions.gameTiles.defaultTile

[develephant]

"TheEndless" wrote:
I believe the format for accessing sub-regions is:

app.tiles.bitmapset.regions["gameTiles.defaultTile"]

instead of

app.tiles.bitmapset.regions.gameTiles.defaultTile

Excellent. I saw that method in the docs, but was only applying it to the last value, which wasn't working. While I think this style of accessing the properties is a bit obscure, it does indeed work.

I had rewritten most of my piece to just use a single frame animation tag, which works great but seems like overkill.

Many thanks for your response. 😉

-dev

[bandal]

What will you cover in your tutorial? I am curious. How soon till it comes available?