pygcoder: A Python repository from braingram

Convert svg to gcode. Inspired by gcodetools inkscape extension.

Converts shapes (within workspace) to gcode paths.

Shapes

rectangle
circle (not used by inkscape)
ellipse (not used by inkscape)
path [maybe just start with all paths for now]

Parameters

Depth is set by color.
Filled objects are milled pockets.
Inside vs outside also by color?
Tool set by color

Operations

Drilling (peck drill?)
Pocket milling (area)
Contour milling (follow inside/outside path)

Load svg Find paths within workspace (width/height of svg) Get color-to-cut mapping for options (or element outside workspace?) Order operations by tool, then depth (shallowest to deepest) Process each operation into gcode (split by tool? by depth?)

Operation processing

all: clearance z height, retract z height, conventional/climb

Drilling: find center of path (probably circle), peck drill? Contour: on, outside or inside? ramp in, plunge in? finishing cut? tabs? Pocket: ramp in, plunge in? finishing cut?

Deps

pysvg : does it buy me anything? svg parsing? do I need this? doesn't support inkscape specific things svg.path : can evaluate bezier points [needed for interpolation] affine : evaluation of transforms

What I need is:

parser (read in svg from file or stdin)
path/shape evaluator (transforms, points on line, center)
style evaluator (to get cut parameters)
writer (to gcode [text] or svg [to return to inkscape]?)
options evaluator [read in tool/options from command line and document]
style evaluator [css parser/resolver, what about xsl?]

for now use svg.path, affine, lxml (etree)

SVG -> moves in common format -> gcode

SVG parse paths to paths in common format Paths in common format (with operations) to more complex paths Convert common format paths to gcode

Common format