I'm trying to create a new Custom Track for UCSC, but I'm not sure exactly how to do it.
I've gone through the tutorial and have made all sorts of tracks using it. But I'm really trying to make a specific type of track: not unlike the "Genome Position" track that comes as one of the default tracks: http://genome.ucsc.edu/trash/hgt/hgt_genome_4b02_5da90.png (See the track at the top)
I've looked into "Genome Graphs", "BedGraphs", "Wiggle files" to mention a few, but nothing I've found seems to allow me to make the boxes - with letters - of multiple colors on a base-by-base basis (lots of "bases" there :) ).
I thought one way to learn this might be to download the Base Position code (is it a "GenomeGraph", a BedGraph, or what?).
Does anyone know where I could find that code? Even better: does anyone know how to make those multi-colored boxes? I'd be thrilled just to know precisely what *TYPE* of track that is: might be able to figure it out from there!