Suggestion: make overrides of setXxxColor to accept directly 0xAABBCC or 0xAABBCCDD or r, g, b or a, r, g, b

Or maybe overload the color method (It's good to have the input type of setXxxColor be a color)

Accepting some HSB color (via conversion function?) would be useful too.

I'll need to play with that. Staging has all of this stuff, btw…

In line-by-line mode, it just stops at the first problem, and never gets to the internal repeat

Yes, silly me, the code above has no var in it!

Contributor Agreement - will do

Just create a Color with an alpha value e.g. setFillColor(new Color(0, 0, 255, 128))

Ah, tried color() with four parameters, not quite the same thing.
Suggestion: make overrides of setXxxColor to accept directly 0xAABBCC or 0xAABBCCDD or r, g, b or a, r, g, b
Works well in Processing and simplifies the coding.
Accepting some HSB color (via conversion function?) would be useful too.

Just do number.toHexString

Thanks! I expected something that simple… ^_^

Ah, this is quite unexpected, first time I meet a language enforcing the brace style! ;-)

Just to clarify, this is more of a scala interpreter thing (when it is fed input a line at a time) than a Scala thing. If you use the Scala compiler to compile code of this nature, it will work fine.

One more thing in the mix here is the use of a 'var' in your script. If you don't use vars, Kojo is able to submit the whole script (in one batch, not line by line) to the interpreter, and things work fine.

I suppose the rule applies to current scope, since the internal repeat is OK.

In line-by-line mode, it just stops at the first problem, and never gets to the internal repeat

Note: I place all my code under the zlib/libpng license, but small experiments like the one above are just put
in public domain: if you find something of interest, feel free to add it to Kojo examples.

Cool.
Now is probably a good time to tell you that if you wish to contribute more substantial code to Kojo, I will request you to sign the Contributor Agreement.

What about transparency? Is it possible in Kojo or just not yet?

Just create a Color with an alpha value e.g. setFillColor(new Color(0, 0, 255, 128))
For Staging, you can also use the rgba color maker.

And is there a convenient shortcut in Scala to display a number in hexa or do we have to use something like Message.format() or similar?

I missed out on this yesterday. Just do number.toHexString

Note: I place all my code under the zlib/libpng license, but small experiments like the one above are just put in public domain: if you find something of interest, feel free to add it to Kojo examples.
I updated the code above to have better contrast on the first three pentagons.

What about transparency? Is it possible in Kojo or just not yet?
And is there a convenient shortcut in Scala to display a number in hexa or do we have to use something like Message.format() or similar?

OK, my first baby steps in Kojo… Purely imperative for now.

Nice and pretty!

There is something that puzzles me: if I replace the for loop with:
var n = 0
repeat (5)
I get an error:

You've stumbled into an edge case within Kojo:
- if a script uses vars, it is interpreted line by line. Your script has a var, so this applies.
- the opening brace of your repeat command starts on the next line. When the scala interpreter encounters the line with the repeat command, it thinks that the code block for repeat is missing.

The Fix - just pull the opening brace to the line with the repeat command:
repeat (5) {

val ROUND = 360 val SIDE_NB = 5 val ANGLE = ROUND / SIDE_NB clear jumpTo(0, 300) write("Pentagon") jumpTo(0, 0) setAnimationDelay(42) setPenColor(blue) setPenThickness(11) for (n <- -2 until 3) { setFillColor(color(0x80 - n * 40, 0xFF, 0x80 + n * 60)) setHeading((2 + n) * ANGLE) repeat (SIDE_NB) { forward(150) turn(-ANGLE) } }

There is something that puzzles me: if I replace the for loop with:

var n = 0 repeat (5)

error: missing arguments for method repeat in object Builtins; follow this method with `_' if you want to treat it as a partially applied function repeat (5) ^

BTW, if I want to print a number in hexa style, what is the idiom in Scala?