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Python gcode.parse and gcode.calc_extents

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25 May 2024 16:14 - 25 May 2024 16:16 #301417 by JT
Python gcode.parse and gcode.calc_extents was created by JT
I'm trying to figure out what gcode.parse and gcode.calc_extents does and how to use it. I've been grepping and searching for examples but I've not found out the syntax and what is returned.
help(gcode)
    calc_extents(...)
        Calculate information about extents of gcode
    parse(...)
        Parse a G-Code file

Not much help there...

With axis running and a terminal open and running python3
>>> gcode.parse()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: parse() takes at least 2 arguments (0 given)

grepping I find this example in src/emc/usr_intf/axis/scripts/axis.py:1589: 
result, seq = gcode.parse("", canon, "M199 P["+e+"]", "M2")

>>> gcode.calc_extents()
([9e+99, 9e+99, 9e+99], [-9e+99, -9e+99, -9e+99], [9e+99, 9e+99, 9e+99], [-9e+99, -9e+99, -9e+99])

So what I'm trying to do is display g code on an PyQt QtOpenGLWidget... I think I should be using the glcanon.py from lib/python/rs274... but not sure. I've been thrashing around for a couple of weeks and have not made any progress. If someone has a clue please let me know.

JT
Last edit: 25 May 2024 16:16 by JT.

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25 May 2024 16:41 #301418 by cmorley
Replied by cmorley on topic Python gcode.parse and gcode.calc_extents
Have you looked at gremlin/qt_graphics?
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25 May 2024 17:30 #301421 by andypugh
Replied by andypugh on topic Python gcode.parse and gcode.calc_extents
By coincidence I found an example of the use of gcode.parse in a post I replied to earlier today:

forum.linuxcnc.org/38-general-linuxcnc-q...code-preview-as-json
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25 May 2024 18:08 #301426 by JT
Replied by JT on topic Python gcode.parse and gcode.calc_extents
I have looked st gremlin/qt5_graphics.py and will look closer at it.

Thanks
JT

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25 May 2024 18:21 #301427 by JT
Replied by JT on topic Python gcode.parse and gcode.calc_extents
Actually I just ran gremlin/qt5_graphics.py with Axis running and other than the offsets not being used it plots, just need to figure out how to use it in my GUI.

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25 May 2024 18:21 #301428 by Aciera
Replied by Aciera on topic Python gcode.parse and gcode.calc_extents
IIRC .parse will run the gcode and create lists of line segments for 'traverse', 'straight_feed' and 'arc_feed' moves while .calc_extents will then find the minimum and maximum coordinates values  from those lists.

This is from lib/python/rs274/glcanon.py:
 

which calls the pyobject in src/emc/rs274ngc/gcodemodule.cc:
 
 
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