Converting RGB values to Hexadecimal?
I am working on a patch to control a string of RGB LEDs via music input. Currently I have been able to use a filter bank to generate R G B values (either on a scale of 0 to 255 or 0 to 1.0) from a color look-up table. I am having trouble figuring out how to convert these values to hex format for output to the LEDs though. I have found several javascript examples, but haven't been able to get them to work within a Max patch, anybody know how to do this?
You can use the Lhex object along with the regexp in the patch below:
I wanted to be able to do this without installing any externals. An alternative is to feed number boxes into [sprintf]. To get HTML color codes, for example, use
sprintf #%x%x%x
if you use sprintf %02x%02x%02x you consistently get 8 numbers
I don't know if this might be useful to someone in the future. here is a patch that converts RGB to hex. Open RGBtoHex subpatch to understand the logic behind this! Cheers
why all that many objects for what single sprintf can do ?
if coll, then one should fill it up with all values, so that it is the most lean solution.
@ROMAN I tried to build such a coll with three [uzi 256] in cascade, feeding a [join 3] going into a [expr $i1 * 65536 + $i2 * 256 + $i3] to generate the index and the [sprintf] seen above to generate the hexadecimal.
Turns out Max hangs forever generating the 16 777 216 possible results :( Had to force it to quit every time.
haha, no of course only for single bytes.
coll tosymbol sprintf, then wrapped in iter zl.len zl.group to support arbitrary list lenghts.