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# SPDX-License-Identifier: GPL-2.0-or-later
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import bpy, math
from mathutils import Vector, Matrix
from bpy_extras.io_utils import ExportHelper
from . import internal
class SvgExport(bpy.types.Operator, ExportHelper):
bl_idname = 'export_svg_format.svg'
bl_description = bl_label = 'Curves (.svg)'
filename_ext = '.svg'
selection_only: bpy.props.BoolProperty(name='Selection only', description='instead of exporting all visible curves')
absolute_coordinates: bpy.props.BoolProperty(name='Absolute coordinates', description='instead of relative coordinates')
viewport_projection: bpy.props.BoolProperty(name='Viewport projection', description='WYSIWYG instead of an local orthographic projection')
unit_name: bpy.props.EnumProperty(name='Unit', items=internal.units, default='mm')
def serialize_point(self, position, update_ref_position=True):
if self.transform:
position = self.transform@Vector((position[0], position[1], position[2], 1.0))
position *= 0.5/position.w
ref_position = self.origin if self.absolute_coordinates else self.ref_position
command = '{:.3f},{:.3f}'.format((position[0]-ref_position[0])*self.scale[0], (position[1]-ref_position[1])*self.scale[1])
if update_ref_position:
self.ref_position = position
return command
def serialize_point_command(self, point, drawing):
if self.absolute_coordinates:
return ('L' if drawing else 'M')+self.serialize_point(point.co)
else:
return ('l' if drawing else 'm')+self.serialize_point(point.co)
def serialize_curve_command(self, prev, next):
return ('C' if self.absolute_coordinates else 'c')+self.serialize_point(prev.handle_right, False)+' '+self.serialize_point(next.handle_left, False)+' '+self.serialize_point(next.co)
def serialize_spline(self, spline):
path = ''
points = spline.bezier_points if spline.type == 'BEZIER' else spline.points
for index, next in enumerate(points):
if index == 0:
path += self.serialize_point_command(next, False)
elif spline.type == 'BEZIER' and (points[index-1].handle_right_type != 'VECTOR' or next.handle_left_type != 'VECTOR'):
path += self.serialize_curve_command(points[index-1], next)
else:
path += self.serialize_point_command(next, True)
if spline.use_cyclic_u:
if spline.type == 'BEZIER' and (points[-1].handle_right_type != 'VECTOR' or points[0].handle_left_type != 'VECTOR'):
path += self.serialize_curve_command(points[-1], points[0])
else:
self.serialize_point(points[0].co)
path += 'Z' if self.absolute_coordinates else 'z'
return path
def serialize_object(self, obj):
if self.area:
self.transform = self.area.spaces.active.region_3d.perspective_matrix@obj.matrix_world
self.origin = Vector((-0.5, 0.5, 0, 0))
else:
self.transform = None
self.origin = Vector((obj.bound_box[0][0], obj.bound_box[7][1], obj.bound_box[0][2], 0))
xml = '\t<g id="'+obj.name+'">\n'
styles = {}
for spline in obj.data.splines:
style = 'none'
if obj.data.dimensions == '2D' and spline.use_cyclic_u:
if spline.material_index < len(obj.data.materials) and obj.data.materials[spline.material_index] != None:
style = Vector(obj.data.materials[spline.material_index].diffuse_color)*255
else:
style = Vector((0.8, 0.8, 0.8))*255
style = 'rgb({},{},{})'.format(round(style[0]), round(style[1]), round(style[2]))
if style in styles:
styles[style].append(spline)
else:
styles[style] = [spline]
for style, splines in styles.items():
style = 'fill:'+style+';'
if style == 'fill:none;':
style += 'stroke:black;'
xml += '\t\t<path style="'+style+'" d="'
self.ref_position = self.origin
for spline in splines:
xml += self.serialize_spline(spline)
xml += '"/>\n'
return xml+'\t</g>\n'
def execute(self, context):
objects = bpy.context.selected_objects if self.selection_only else bpy.context.visible_objects
curves = []
for obj in objects:
if obj.type == 'CURVE':
curves.append(obj)
if len(curves) == 0:
self.report({'WARNING'}, 'Nothing to export')
return {'CANCELLED'}
self.area = None
if self.viewport_projection:
for area in bpy.context.screen.areas:
if area.type == 'VIEW_3D':
self.region = None
for region in area.regions:
if region.type == 'WINDOW':
self.region = region
if self.region == None:
continue
self.area = area
self.bounds = Vector((self.region.width, self.region.height, 0))
self.scale = Vector(self.bounds)
if self.unit_name != 'px':
self.unit_name = '-'
if self.area == None:
self.bounds = Vector((0, 0, 0))
for obj in curves:
self.bounds[0] = max(self.bounds[0], obj.bound_box[7][0]-obj.bound_box[0][0])
self.bounds[1] = max(self.bounds[1], obj.bound_box[7][1]-obj.bound_box[0][1])
self.scale = Vector((1, 1, 0))
for unit in internal.units:
if self.unit_name == unit[0]:
self.scale *= 1.0/float(unit[2])
break
self.scale *= context.scene.unit_settings.scale_length
self.bounds = Vector(a*b for a,b in zip(self.bounds, self.scale))
self.scale[1] *= -1
with open(self.filepath, 'w') as f:
svg_view = ('' if self.unit_name == '-' else 'width="{0:.3f}{2}" height="{1:.3f}{2}" ')+'viewBox="0 0 {0:.3f} {1:.3f}">\n'
f.write('''<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg xmlns="http://www.w3.org/2000/svg" '''+svg_view.format(self.bounds[0], self.bounds[1], self.unit_name))
for obj in curves:
f.write(self.serialize_object(obj))
f.write('</svg>')
return {'FINISHED'}
class GCodeExport(bpy.types.Operator, ExportHelper):
bl_idname = 'export_gcode_format.gcode'
bl_description = bl_label = 'Toolpath (.gcode)'
filename_ext = '.gcode'
speed: bpy.props.FloatProperty(name='Speed', description='Maximal speed in mm / minute', min=0, default=60)
step_angle: bpy.props.FloatProperty(name='Resolution', description='Smaller values make curves smoother by adding more vertices', unit='ROTATION', min=math.pi/128, default=math.pi/16)
local_coordinates: bpy.props.BoolProperty(name='Local coords', description='instead of global coordinates')
detect_circles: bpy.props.BoolProperty(name='Detect Circles', description='Export bezier circles and helixes as G02 and G03') # TODO: Detect polygon circles too, merge consecutive circle segments
@classmethod
def poll(cls, context):
obj = bpy.context.object
return obj != None and obj.type == 'CURVE' and len(obj.data.splines) == 1 and not obj.data.splines[0].use_cyclic_u
def execute(self, context):
self.scale = Vector((1, 1, 1))
self.scale *= context.scene.unit_settings.scale_length*1000.0
with open(self.filepath, 'w') as f:
f.write('G21\n') # Length is measured in millimeters
spline = bpy.context.object.data.splines[0]
if spline.use_cyclic_u:
return gcode
def transform(position):
result = Vector((position[0]*self.scale[0], position[1]*self.scale[1], position[2]*self.scale[2])) # , 1.0
return result if self.local_coordinates else bpy.context.object.matrix_world@result
points = spline.bezier_points if spline.type == 'BEZIER' else spline.points
prevSpeed = -1
for index, current in enumerate(points):
speed = self.speed*max(0.0, min(current.weight_softbody, 1.0))
if speed != prevSpeed and current.weight_softbody != 1.0:
f.write('F{:.3f}\n'.format(speed))
prevSpeed = speed
speed_code = 'G00' if current.weight_softbody == 1.0 else 'G01'
prev = points[index-1]
linear = spline.type != 'BEZIER' or index == 0 or (prev.handle_right_type == 'VECTOR' and current.handle_left_type == 'VECTOR')
position = transform(current.co)
if linear:
f.write(speed_code+' X{:.3f} Y{:.3f} Z{:.3f}\n'.format(position[0], position[1], position[2]))
else:
segment_points = internal.bezierSegmentPoints(prev, current)
circle = None
if self.detect_circles:
for axis in range(0, 3):
projected_points = []
for point in segment_points:
projected_point = Vector(point)
projected_point[axis] = 0.0
projected_points.append(projected_point)
circle = internal.circleOfBezier(projected_points)
if circle:
normal = circle.orientation.col[2]
center = transform(circle.center-prev.co)
f.write('G{} G0{} I{:.3f} J{:.3f} K{:.3f} X{:.3f} Y{:.3f} Z{:.3f}\n'.format(19-axis, 3 if normal[axis] > 0.0 else 2, center[0], center[1], center[2], position[0], position[1], position[2]))
break
if circle == None:
bezier_samples = 128
prev_tangent = internal.bezierTangentAt(segment_points, 0).normalized()
for t in range(1, bezier_samples+1):
t /= bezier_samples
tangent = internal.bezierTangentAt(segment_points, t).normalized()
if t == 1 or math.acos(min(max(-1, prev_tangent@tangent), 1)) >= self.step_angle:
position = transform(internal.bezierPointAt(segment_points, t))
prev_tangent = tangent
f.write(speed_code+' X{:.3f} Y{:.3f} Z{:.3f}\n'.format(position[0], position[1], position[2]))
return {'FINISHED'}
def register():
for cls in classes:
bpy.utils.register_class(operators)
def unregister():
for cls in classes:
bpy.utils.unregister_class(operators)
if __name__ == "__main__":
register()
operators = [SvgExport, GCodeExport]