automatically anchor bins/sequences around target gene, feature, ...

[thackl]

It's already possible to shift bins in order to align sequences, but if one wants to align everything, for example, at a certain gene, those coordinates have to be manually precomputed and given to shift

[thackl]

Here's a draft implementation for an anchor function. Might need some more testing - especially in multi-contig context. Ideas for additional functionality are also welcome.

pp <- 
	# left-align on MCP gene
	p2 |> anchor(name == "MCP") +
	# left-align on MCP gene after flipping bins
	p2 |> sync() |> anchor(name =="MCP") +
	# right-align on MCP gene
	p2 |> anchor(name == "MCP", .align = "right") +
	# center-align on MCP + pri-hel gene
	p2 |> sync() |> anchor(name %in% c("MCP", "pri-hel"), .align = "center") +
	# center-align by fraction on MCP and pri-hel gene (hjust-like behaviour)
	p2 |> anchor(name %in% c("MCP", "pri-hel"), .align = .5) +
	# right-align by fraction after flipping
	p2 |> sync() |> anchor(name %in% c("MCP", "pri-hel"), .align = 1)
	
pp