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pcb-tools-extension/gerberex/dxf.py
Hiroshi Murayama fc3f1a23b8 improve DXF file handling functions: 
- DM_LINE mode support to generate Excellon routing sequence
- DM_MOUSE_BITES mode support to generate mouse bites along all path also,  not only line object
2019-09-28 17:40:09 +09:00

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
import io, sys
from math import pi, cos, sin, tan, atan, atan2, acos, asin, sqrt
import dxfgrabber
from gerber.cam import CamFile, FileSettings
from gerber.utils import inch, metric, write_gerber_value, rotate_point
from gerber.gerber_statements import ADParamStmt
from gerber.excellon_statements import ExcellonTool
from gerber.excellon_statements import CoordinateStmt
from gerberex.utility import is_equal_point, is_equal_value
from gerberex.dxf_path import generate_paths
from gerberex.excellon import write_excellon_header
from gerberex.rs274x import write_gerber_header
ACCEPTABLE_ERROR = 0.001
class DxfStatement(object):
def __init__(self, entity):
self.entity = entity
self.start = None
self.end = None
self.is_closed = False
def to_inch(self):
pass
def to_metric(self):
pass
def is_equal_to(self, target, error_range=0):
return False
def reverse(self):
raise Exception('Not implemented')
def offset(self, offset_x, offset_y):
raise Exception('Not supported')
def rotate(self, angle, center=(0, 0)):
raise Exception('Not supported')
class DxfLineStatement(DxfStatement):
@classmethod
def from_entity(cls, entity):
start = (entity.start[0], entity.start[1])
end = (entity.end[0], entity.end[1])
return cls(entity, start, end)
def __init__(self, entity, start, end):
super(DxfLineStatement, self).__init__(entity)
self.start = start
self.end = end
def to_inch(self):
self.start = (
inch(self.start[0]), inch(self.start[1]))
self.end = (
inch(self.end[0]), inch(self.end[1]))
def to_metric(self):
self.start = (
metric(self.start[0]), metric(self.start[1]))
self.end = (
metric(self.end[0]), metric(self.end[1]))
def is_equal_to(self, target, error_range=0):
if not isinstance(target, DxfLineStatement):
return False
return (is_equal_point(self.start, target.start, error_range) and \
is_equal_point(self.end, target.end, error_range)) or \
(is_equal_point(self.start, target.end, error_range) and \
is_equal_point(self.end, target.start, error_range))
def reverse(self):
pt = self.start
self.start = self.end
self.end = pt
def dots(self, pitch, width, offset=0):
x0, y0 = self.start
x1, y1 = self.end
y1 = self.end[1]
xp = x1 - x0
yp = y1 - y0
l = sqrt(xp * xp + yp * yp)
xd = xp * pitch / l
yd = yp * pitch / l
x0 += xp * offset / l
y0 += yp * offset / l
if offset > l + width / 2:
return (None, offset - l)
else:
d = offset;
while d < l + width / 2:
yield ((x0, y0), d - l)
x0 += xd
y0 += yd
d += pitch
def offset(self, offset_x, offset_y):
self.start = (self.start[0] + offset_x, self.start[1] + offset_y)
self.end = (self.end[0] + offset_x, self.end[1] + offset_y)
def rotate(self, angle, center=(0, 0)):
self.start = rotate_point(self.start, angle, center)
self.end = rotate_point(self.end, angle, center)
class DxfArcStatement(DxfStatement):
def __init__(self, entity):
super(DxfArcStatement, self).__init__(entity)
if entity.dxftype == 'CIRCLE':
self.radius = self.entity.radius
self.center = (self.entity.center[0], self.entity.center[1])
self.start = (self.center[0] + self.radius, self.center[1])
self.end = self.start
self.start_angle = 0
self.end_angle = -360
self.is_closed = True
elif entity.dxftype == 'ARC':
self.start_angle = self.entity.start_angle
self.end_angle = self.entity.end_angle
self.radius = self.entity.radius
self.center = (self.entity.center[0], self.entity.center[1])
self.start = (
self.center[0] + self.radius * cos(self.start_angle / 180. * pi),
self.center[1] + self.radius * sin(self.start_angle / 180. * pi),
)
self.end = (
self.center[0] + self.radius * cos(self.end_angle / 180. * pi),
self.center[1] + self.radius * sin(self.end_angle / 180. * pi),
)
angle = self.end_angle - self.start_angle
self.is_closed = angle >= 360 or angle <= -360
else:
raise Exception('invalid DXF type was specified')
def to_inch(self):
self.radius = inch(self.radius)
self.center = (inch(self.center[0]), inch(self.center[1]))
self.start = (inch(self.start[0]), inch(self.start[1]))
self.end = (inch(self.end[0]), inch(self.end[1]))
def to_metric(self):
self.radius = metric(self.radius)
self.center = (metric(self.center[0]), metric(self.center[1]))
self.start = (metric(self.start[0]), metric(self.start[1]))
self.end = (metric(self.end[0]), metric(self.end[1]))
def is_equal_to(self, target, error_range=0):
if not isinstance(target, DxfArcStatement):
return False
aerror_range = error_range / pi * self.radius * 180
return is_equal_point(self.center, target.center, error_range) and \
is_equal_value(self.radius, target.radius, error_range) and \
((is_equal_value(self.start_angle, target.start_angle, aerror_range) and
is_equal_value(self.end_angle, target.end_angle, aerror_range)) or
(is_equal_value(self.start_angle, target.end_angle, aerror_range) and
is_equal_value(self.end_angle, target.end_angle, aerror_range)))
def reverse(self):
tmp = self.start_angle
self.start_angle = self.end_angle
self.end_angle = tmp
tmp = self.start
self.start = self.end
self.end = tmp
def dots(self, pitch, width, offset=0):
angle = self.end_angle - self.start_angle
afactor = 1 if angle > 0 else -1
aangle = angle * afactor
L = 2 * pi * self.radius
l = L * aangle / 360
pangle = pitch / L * 360
wangle = width / L * 360
oangle = offset / L * 360
if offset > l + width / 2:
yield (None, offset - l)
else:
da = oangle
while da < aangle + wangle / 2:
cangle = self.start_angle + da * afactor
x = self.radius * cos(cangle / 180 * pi) + self.center[0]
y = self.radius * sin(cangle / 180 * pi) + self.center[1]
remain = (da - aangle) / 360 * L
yield((x, y), remain)
da += pangle
def offset(self, offset_x, offset_y):
self.center = (self.center[0] + offset_x, self.center[1] + offset_y)
self.start = (self.start[0] + offset_x, self.start[1] + offset_y)
self.end = (self.end[0] + offset_x, self.end[1] + offset_y)
def rotate(self, angle, center=(0, 0)):
self.start_angle += angle
self.end_angle += angle
self.center = rotate_point(self.center, angle, center)
self.start = rotate_point(self.start, angle, center)
self.end = rotate_point(self.end, angle, center)
class DxfPolylineStatement(DxfStatement):
def __init__(self, entity):
super(DxfPolylineStatement, self).__init__(entity)
self.start = (self.entity.points[0][0], self.entity.points[0][1])
self.is_closed = self.entity.is_closed
if self.is_closed:
self.end = self.start
else:
self.end = (self.entity.points[-1][0], self.entity.points[-1][1])
def disassemble(self):
class Item:
pass
def ptseq():
for i in range(1, len(self.entity.points)):
yield i
if self.entity.is_closed:
yield 0
x0 = self.entity.points[0][0]
y0 = self.entity.points[0][1]
b = self.entity.bulge[0]
for idx in ptseq():
pt = self.entity.points[idx]
x1 = pt[0]
y1 = pt[1]
if b == 0:
item = Item()
item.dxftype = 'LINE'
item.start = (x0, y0)
item.end = (x1, y1)
item.is_closed = False
yield DxfLineStatement.from_entity(item)
else:
ang = 4 * atan(b)
xm = x0 + x1
ym = y0 + y1
t = 1 / tan(ang / 2)
xc = (xm - t * (y1 - y0)) / 2
yc = (ym + t * (x1 - x0)) / 2
r = sqrt((x0 - xc)*(x0 - xc) + (y0 - yc)*(y0 - yc))
rx0 = x0 - xc
ry0 = y0 - yc
rc = max(min(rx0 / r, 1.0), -1.0)
start_angle = acos(rc) if ry0 > 0 else 2 * pi - acos(rc)
start_angle *= 180 / pi
end_angle = start_angle + ang * 180 / pi
item = Item()
item.dxftype = 'ARC'
item.start = (x0, y0)
item.end = (x1, y1)
item.start_angle = start_angle
item.end_angle = end_angle
item.radius = r
item.center = (xc, yc)
item.is_closed = end_angle - start_angle >= 360
yield DxfArcStatement(item)
x0 = x1
y0 = y1
b = self.entity.bulge[idx]
def to_inch(self):
self.start = (inch(self.start[0]), inch(self.start[1]))
self.end = (inch(self.end[0]), inch(self.end[1]))
for idx in range(0, len(self.entity.points)):
self.entity.points[idx] = (
inch(self.entity.points[idx][0]), inch(self.entity.points[idx][1]))
def to_metric(self):
self.start = (metric(self.start[0]), metric(self.start[1]))
self.end = (metric(self.end[0]), metric(self.end[1]))
for idx in range(0, len(self.entity.points)):
self.entity.points[idx] = (
metric(self.entity.points[idx][0]), metric(self.entity.points[idx][1]))
def offset(self, offset_x, offset_y):
for idx in range(len(self.entity.points)):
self.entity.points[idx] = (
self.entity.points[idx][0] + offset_x, self.entity.points[idx][1] + offset_y)
def rotate(self, angle, center=(0, 0)):
for idx in range(len(self.entity.points)):
self.entity.points[idx] = rotate_point(self.entity.points[idx], angle, center)
class DxfStatements(object):
def __init__(self, statements, units, dcode=10, draw_mode=None):
if draw_mode == None:
draw_mode = DxfFile.DM_LINE
self._units = units
self.dcode = dcode
self.draw_mode = draw_mode
self.pitch = inch(1) if self._units == 'inch' else 1
self.width = 0
self.error_range = inch(ACCEPTABLE_ERROR) if self._units == 'inch' else ACCEPTABLE_ERROR
self.statements = statements
self.close_paths, self.open_paths = generate_paths(self.statements, self.error_range)
@property
def units(self):
return _units
def to_gerber(self, settings=FileSettings()):
def gerbers():
yield 'G75*'
yield '%LPD*%'
yield 'D{0}*'.format(self.dcode)
if self.draw_mode == DxfFile.DM_FILL:
yield 'G36*'
for path in self.close_paths:
yield path.to_gerber(settings)
yield 'G37*'
else:
pitch = self.pitch if self.draw_mode == DxfFile.DM_MOUSE_BITES else 0
for path in self.open_paths:
yield path.to_gerber(settings, pitch=pitch, width=self.width)
for path in self.close_paths:
yield path.to_gerber(settings, pitch=pitch, width=self.width)
return '\n'.join(gerbers())
def to_excellon(self, settings=FileSettings()):
if self.draw_mode == DxfFile.DM_FILL:
return
def drills():
pitch = self.pitch if self.draw_mode == DxfFile.DM_MOUSE_BITES else 0
for path in self.open_paths:
yield path.to_excellon(settings, pitch=pitch, width=self.width)
for path in self.close_paths:
yield path.to_excellon(settings, pitch=pitch, width=self.width)
return '\n'.join(drills())
def to_inch(self):
if self._units == 'metric':
self._units = 'inch'
self.pitch = inch(self.pitch)
self.width = inch(self.width)
self.error_range = inch(self.error_range)
for path in self.open_paths:
path.to_inch()
for path in self.close_paths:
path.to_inch()
def to_metric(self):
if self._units == 'inch':
self._units = 'metric'
self.pitch = metric(self.pitch)
self.width = metric(self.width)
self.error_range = metric(self.error_range)
for path in self.open_paths:
path.to_metric()
for path in self.close_paths:
path.to_metric()
def offset(self, offset_x, offset_y):
for path in self.open_paths:
path.offset(offset_x, offset_y)
for path in self.close_paths:
path.offset(offset_x, offset_y)
def rotate(self, angle, center=(0, 0)):
for path in self.open_paths:
path.rotate(angle, center)
for path in self.close_paths:
path.rotate(angle, center)
class DxfFile(CamFile):
DM_LINE = 0
DM_FILL = 1
DM_MOUSE_BITES = 2
FT_RX274X = 0
FT_EXCELLON = 1
@classmethod
def from_dxf(cls, dxf, settings=None, draw_mode=None, filename=None):
fsettings = settings if settings else \
FileSettings(zero_suppression='leading')
if dxf.header['$INSUNITS'] == 1:
fsettings.units = 'inch'
if not settings:
fsettings.format = (2, 5)
else:
fsettings.units = 'metric'
if not settings:
fsettings.format = (3, 4)
statements = []
for entity in dxf.entities:
if entity.dxftype == 'LWPOLYLINE':
statements.append(DxfPolylineStatement(entity))
elif entity.dxftype == 'LINE':
statements.append(DxfLineStatement.from_entity(entity))
elif entity.dxftype == 'CIRCLE':
statements.append(DxfArcStatement(entity))
elif entity.dxftype == 'ARC':
statements.append(DxfArcStatement(entity))
return cls(statements, fsettings, draw_mode, filename)
@classmethod
def rectangle(cls, width, height, left=0, bottom=0, units='metric', draw_mode=None, filename=None):
if units == 'metric':
settings = FileSettings(units=units, zero_suppression='leading', format=(3,4))
else:
settings = FileSettings(units=units, zero_suppression='leading', format=(2,5))
statements = [
DxfLineStatement(None, (left, bottom), (left + width, bottom)),
DxfLineStatement(None, (left + width, bottom), (left + width, bottom + height)),
DxfLineStatement(None, (left + width, bottom + height), (left, bottom + height)),
DxfLineStatement(None, (left, bottom + height), (left, bottom)),
]
return cls(statements, settings, draw_mode, filename)
def __init__(self, statements, settings=None, draw_mode=None, filename=None):
if not settings:
settings = FileSettings(units='metric', format=(3,4), zero_suppression='leading')
if draw_mode == None:
draw_mode = self.DM_LINE
super(DxfFile, self).__init__(settings=settings, filename=filename)
self._draw_mode = draw_mode
self.aperture = ADParamStmt.circle(dcode=10, diameter=0.0)
if settings.units == 'inch':
self.aperture.to_inch()
else:
self.aperture.to_metric()
self.statements = DxfStatements(
statements, self.units, dcode=self.aperture.d, draw_mode=self.draw_mode)
@property
def dcode(self):
return self.aperture.dcode
@dcode.setter
def dcode(self, value):
self.aperture.d = value
self.statements.dcode = value
@property
def width(self):
return self.aperture.modifiers[0][0]
@width.setter
def width(self, value):
self.aperture.modifiers = ([float(value),],)
self.statements.width = value
@property
def draw_mode(self):
return self._draw_mode
@draw_mode.setter
def draw_mode(self, value):
self._draw_mode = value
self.statements.draw_mode = value
@property
def pitch(self):
return self.statements.pitch
@pitch.setter
def pitch(self, value):
self.statements.pitch = value
def write(self, filename=None, filetype=FT_RX274X):
if self.settings.notation != 'absolute':
raise Exception('DXF file\'s notation must be absolute ')
filename = filename if filename is not None else self.filename
with open(filename, 'w') as f:
if filetype == self.FT_RX274X:
write_gerber_header(f, self.settings)
f.write(self.aperture.to_gerber(self.settings) + '\n')
f.write(self.statements.to_gerber(self.settings) + '\n')
f.write('M02*\n')
else:
tools = [ExcellonTool(self.settings, number=1, diameter=self.width)]
write_excellon_header(f, self.settings, tools)
f.write('T01\n')
f.write(self.statements.to_excellon(self.settings) + '\n')
f.write('M30\n')
def to_inch(self):
if self.units == 'metric':
self.aperture.to_inch()
self.statements.to_inch()
self.pitch = inch(self.pitch)
self.units = 'inch'
def to_metric(self):
if self.units == 'inch':
self.aperture.to_metric()
self.statements.to_metric()
self.pitch = metric(self.pitch)
self.units = 'metric'
def offset(self, offset_x, offset_y):
self.statements.offset(offset_x, offset_y)
def rotate(self, angle, center=(0, 0)):
self.statements.rotate(angle, center)
def loads(data, filename=None):
if sys.version_info.major == 2:
data = unicode(data)
stream = io.StringIO(data)
dxf = dxfgrabber.read(stream)
return DxfFile.from_dxf(dxf)
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