Managing offsets and baby stepping

[synman]

We need a way to track work system offsets.

$# facilitates this by returning a list of the X/Y/Z offsets for each coordinate work system:

Send: $#
Recv: [G54:-484.000,-393.000,-46.300]
Recv: [G55:0.000,0.000,0.000]
Recv: [G56:0.000,0.000,0.000]
Recv: [G57:0.000,0.000,0.000]
Recv: [G58:0.000,0.000,0.000]
Recv: [G59:0.000,0.000,0.000]
Recv: [G28:0.000,0.000,0.000]
Recv: [G30:0.000,0.000,0.000]
Recv: [G92:0.000,0.000,0.000]
Recv: [TLO:0.000]
Recv: ok

Here's what I envision for it as dictionary list:

{   
    "G54": {
            "x": -484,
            "y": -393,
            "z": -46.3
    },
    "G55": {
            "x": 0,
            "y": 0,
            "z": 0
    }
}

and then an internal mechanism within BGS to allow for changing the X/Y/Z offsets dynamically, much like how Marlin provides for baby stepping.

[synman]

@paukstelis starting to build this up

[synman]

I've tested part of this thus far.... getting the offsets is working well via the tracked_commands method and I've also ensured whenever I change them using G10 that I update their values with those changes.

this leaves us with the actual baby stepping method I threw into _bgs to support this:

def babystep_offset(_plugin, program, axis, increment):
    pgm = int(program.replace("G", "")) - 53
    newvalue = _plugin.offsets[program][axis] + increment

    _plugin._printer.commands("G10 L2 P{} {}{}".format(pgm, axis, newvalue))

    # update our offsets
    _plugin.offsets[program][axis] = newvalue

calling it like so from the plugin:

_bgs.babystep_offset(self, self.grblCoordinateSystem, "z", .01    # increments z offset + .01 for active system
_bgs.babystep_offset(self, self.grblCoordinateSystem, "z", -.01    # increments z offset - .01 for active system

[synman]

so with the plumbing done, now to figure out how to integrate this into the UI. I'm half tempted to create another sidebar widget like the framing / bounding box one, but specific to (baby) stepping the offsets.