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# ***************************************************************************
# * Copyright (c) 2024 Ondsel <development@ondsel.com> *
# * *
# * This program is free software; you can redistribute it and/or modify *
# * it under the terms of the GNU Lesser General Public License (LGPL) *
# * as published by the Free Software Foundation; either version 2 of *
# * the License, or (at your option) any later version. *
# * for detail see the LICENCE text file. *
# * *
# * This program is distributed in the hope that it will be useful, *
# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
# * GNU Library General Public License for more details. *
# * *
# * You should have received a copy of the GNU Library General Public *
# * License along with this program; if not, write to the Free Software *
# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
# * USA *
# * *
# ***************************************************************************
from Path.Post.Processor import PostProcessor
import Path
import FreeCAD
import math
Path.Log.setLevel(Path.Log.Level.INFO, Path.Log.thisModule())
translate = FreeCAD.Qt.translate
debug = False
if debug:
Path.Log.setLevel(Path.Log.Level.DEBUG, Path.Log.thisModule())
Path.Log.trackModule(Path.Log.thisModule())
else:
Path.Log.setLevel(Path.Log.Level.INFO, Path.Log.thisModule())
# Define colors for the layers
LAYER_COLORS = {"CUT": "red", "ENGRAVE": "blue", "FILL": "green", "DEFAULT": "black"}
class Svg(PostProcessor):
def __init__(self, job):
super().__init__(
job,
tooltip=translate("CAM", "SVG post processor"),
tooltipargs=[],
units="mm",
)
Path.Log.debug("SVG post processor initialized")
def export(self):
Path.Log.debug("Exporting the job")
use_layers = "--layers" in self._job.PostProcessorArgs
postables = self._buildPostList()
Path.Log.debug(f"postables count: {len(postables)}")
svg_strings = []
for idx, section in enumerate(postables):
svg_content = self.create_svg_section(section, idx, use_layers)
svg_strings.append((idx, svg_content))
return svg_strings
def create_svg_section(self, section, idx, use_layers):
Path.Log.track()
partname, sublist = section
# Initialize bounding box
xmin, ymin, xmax, ymax = self.calculate_bounding_box(sublist)
if xmin is None or ymin is None or xmax is None or ymax is None:
Path.Log.debug("No wires found, skipping section")
return ""
width = xmax - xmin
height = ymax - ymin
# Create the SVG header with a normalized viewBox
svg_content = (
f'<svg xmlns="http://www.w3.org/2000/svg" '
f'xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" '
f'width="{width}mm" height="{height}mm" viewBox="0 0 {width} {height}">\n'
)
# Convert each wire to an SVG path
for obj_idx, obj in enumerate(sublist):
strokestyle = self.get_stroke_style(obj)
color = strokestyle["color"]
width = strokestyle["width"]
pathtype = strokestyle["label"]
Path.Log.debug(pathtype)
wires = Path.Geom.wiresForPath(obj.Path)
if not wires:
continue # Skip objects that do not produce wires
if use_layers:
layer_id = f"layer{idx}_{obj_idx}"
svg_content += (
f'<g id="{layer_id}" inkscape:label="{obj.Label}" inkscape:groupmode="layer">\n'
)
for wire in wires:
path_data = self.wire_to_svg_path(wire, width, height, xmin, ymin)
if pathtype == "FILL":
svg_content += f' <path d="{path_data}" stroke="none" fill="{color}" />\n'
else:
svg_content += f' <path d="{path_data}" stroke="{color}" stroke-width="{width}" fill="none" />\n'
if use_layers:
svg_content += "</g>\n"
# Close the SVG tag
svg_content += "</svg>"
return svg_content
def wire_to_svg_path(self, wire, width, height, xmin, ymin):
"""Convert FreeCAD wire to SVG path data with y-axis inversion and limited precision"""
path_data = ""
is_first_point = True
vertices_info = []
def format_coord(value):
return f"{value:.4f}"
for edge in wire.Edges:
start_point = edge.Vertexes[0].Point
end_point = edge.Vertexes[-1].Point
Path.Log.debug(f"Edge Type: {edge.Curve.TypeId}")
Path.Log.debug(
f"Start Point: ({format_coord(start_point.x)}, {format_coord(start_point.y)})"
)
Path.Log.debug(f"End Point: ({format_coord(end_point.x)}, {format_coord(end_point.y)})")
# Check if the edge is vertical (should be skipped)
if start_point.x == end_point.x and start_point.y == end_point.y:
Path.Log.debug("Skipping vertical edge")
continue
if is_first_point:
path_data += f"M {format_coord(start_point.x - xmin)} {format_coord(height - (start_point.y - ymin))} "
vertices_info.append(
f"M {format_coord(start_point.x - xmin)} {format_coord(height - (start_point.y - ymin))}"
)
is_first_point = False
if edge.Curve.TypeId in ["Part::GeomLineSegment", "Part::GeomLine"]:
# Handle line segment without discretization
path_data += f"L {format_coord(end_point.x - xmin)} {format_coord(height - (end_point.y - ymin))} "
vertices_info.append(
f"L {format_coord(end_point.x - xmin)} {format_coord(height - (end_point.y - ymin))}"
)
Path.Log.debug(
f"Line segment from ({format_coord(start_point.x)}, {format_coord(start_point.y)}) to ({format_coord(end_point.x)}, {format_coord(end_point.y)})"
)
elif edge.Curve.TypeId in ["Part::GeomCircle", "Part::GeomArcOfCircle"]:
# Handle circular arc using 'A' command
radius = edge.Curve.Radius
center = edge.Curve.Center
start_angle = math.atan2(start_point.y - center.y, start_point.x - center.x)
end_angle = math.atan2(end_point.y - center.y, end_point.x - center.x)
# Calculate the angle difference and normalize to [-π, π]
angle_diff = (end_angle - start_angle) % (2 * math.pi)
if angle_diff > math.pi:
angle_diff -= 2 * math.pi
Path.Log.debug(f"Angle difference: {angle_diff:.2f} radians")
# Determine the large_arc_flag and sweep_flag
large_arc_flag = 1 if abs(angle_diff) > (math.pi) else 0
sweep_flag = 0 if angle_diff > 0 else 1
start_x = format_coord(start_point.x - xmin)
start_y = format_coord(height - (start_point.y - ymin))
end_x = format_coord(end_point.x - xmin)
end_y = format_coord(height - (end_point.y - ymin))
path_data += f"A {format_coord(radius)} {format_coord(radius)} 0 {large_arc_flag} {sweep_flag} {end_x} {end_y} "
vertices_info.append(
f"A {format_coord(radius)} {format_coord(radius)} 0 {large_arc_flag} {sweep_flag} {end_x} {end_y}"
)
Path.Log.debug(
f"Circular arc with radius {format_coord(radius)} from ({start_x}, {start_y}) to ({end_x}, {end_y}) (large_arc_flag: {large_arc_flag}, sweep_flag: {sweep_flag})"
)
Path.Log.debug(path_data)
else:
# Discretize other types of edges into 100 segments
vertices = edge.discretize(100)
if len(vertices) < 2:
continue
if all(vertices[0].x == v.x and vertices[0].y == v.y for v in vertices[1:]):
continue
for vertex in vertices:
path_data += f"L {format_coord(vertex.x - xmin)} {format_coord(height - (vertex.y - ymin))} "
vertices_info.append(
f"L {format_coord(vertex.x - xmin)} {format_coord(height - (vertex.y - ymin))}"
)
Path.Log.debug(f"Discretized edge with {len(vertices)} points")
path_data += "Z " # Close the path for filled edges
vertices_info.append("Z")
Path.Log.debug(f"SVG Path: {path_data.strip()}")
Path.Log.debug(f"Vertices Info: {vertices_info}")
return path_data.strip()
def calculate_bounding_box(self, sublist):
xmin, ymin, xmax, ymax = None, None, None, None
for obj in sublist:
wires = Path.Geom.wiresForPath(obj.Path)
for wire in wires:
for vertex in wire.Vertexes:
x, y = vertex.X, vertex.Y
if xmin is None or x < xmin:
xmin = x
if xmax is None or x > xmax:
xmax = x
if ymin is None or y < ymin:
ymin = y
if ymax is None or y > ymax:
ymax = y
return xmin, ymin, xmax, ymax
def get_stroke_style(self, obj):
strokewidth = 0.1
color = LAYER_COLORS["DEFAULT"]
label = None
if hasattr(obj, "ToolController"):
tc = obj.ToolController
if hasattr(tc, "Tool") and hasattr(tc.Tool, "Diameter"):
strokewidth = tc.Tool.Diameter
if hasattr(tc, "Label"):
for key in LAYER_COLORS:
if key in tc.Label:
label = key
color = LAYER_COLORS[key]
break
return {"width": strokewidth, "color": color, "label": label}
@property
def tooltip(self):
tooltip = """
This is the Ondsel SVG CAM post processor.
It will export a CAM job to an SVG file with colors and layers.
Tool Controllers determine how the svg will be created and, thus, how the
laser will behave. They must have a label containing a string from the list at the top of the post file.
(e.g. CUT, FILL, ENGRAVE). SVG Paths will be color coded similarly
Actual laser behavior will depend on how the laser controller is configured
to process the colors / layers.
Step-downs in operations will result in multiple passes.
"""
return tooltip
@property
def tooltipArgs(self):
argtooltip = """
--layers: Output will be written to different layers. Layer names are taken from the operation label
"""
return argtooltip
@property
def preferredExtension(self):
return "svg"
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