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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
# Copyright 2022 Jan Götte <gerbonara@jaseg.de>
import warnings
import contextlib
import math
from .expression import Expression, UnitExpression, ConstantExpression, expr
from .. import graphic_primitives as gp
def point_distance(a, b):
x1, y1 = a
x2, y2 = b
return math.sqrt((x2 - x1)**2 + (y2 - y1)**2)
def deg_to_rad(a):
return (a / 180) * math.pi
class Primitive:
def __init__(self, unit, args):
self.unit = unit
if len(args) > len(type(self).__annotations__):
raise ValueError(f'Too many arguments ({len(args)}) for aperture macro primitive {self.code} ({type(self)})')
for arg, (name, fieldtype) in zip(args, type(self).__annotations__.items()):
arg = expr(arg) # convert int/float to Expression object
if fieldtype == UnitExpression:
setattr(self, name, UnitExpression(arg, unit))
else:
setattr(self, name, arg)
for name in type(self).__annotations__:
if not hasattr(self, name):
raise ValueError(f'Too few arguments ({len(args)}) for aperture macro primitive {self.code} ({type(self)})')
def to_gerber(self, unit=None):
return f'{self.code},' + ','.join(
getattr(self, name).to_gerber(unit) for name in type(self).__annotations__)
def __str__(self):
attrs = ','.join(str(getattr(self, name)).strip('<>') for name in type(self).__annotations__)
return f'<{type(self).__name__} {attrs}>'
class Calculator:
def __init__(self, instance, variable_binding={}, unit=None):
self.instance = instance
self.variable_binding = variable_binding
self.unit = unit
def __enter__(self):
return self
def __exit__(self, _type, _value, _traceback):
pass
def __getattr__(self, name):
return getattr(self.instance, name).calculate(self.variable_binding, self.unit)
def __call__(self, expr):
return expr.calculate(self.variable_binding, self.unit)
class Circle(Primitive):
code = 1
exposure : Expression
diameter : UnitExpression
# center x/y
x : UnitExpression
y : UnitExpression
rotation : Expression = None
def __init__(self, unit, args):
super().__init__(unit, args)
if self.rotation is None:
self.rotation = ConstantExpression(0)
def to_graphic_primitives(self, offset, rotation, variable_binding={}, unit=None):
with self.Calculator(self, variable_binding, unit) as calc:
x, y = gp.rotate_point(calc.x, calc.y, deg_to_rad(calc.rotation) + rotation, 0, 0)
x, y = x+offset[0], y+offset[1]
return [ gp.Circle(x, y, calc.diameter/2, polarity_dark=bool(calc.exposure)) ]
def dilate(self, offset, unit):
self.diameter += UnitExpression(offset, unit)
class VectorLine(Primitive):
code = 20
exposure : Expression
width : UnitExpression
start_x : UnitExpression
start_y : UnitExpression
end_x : UnitExpression
end_y : UnitExpression
rotation : Expression
def to_graphic_primitives(self, offset, rotation, variable_binding={}, unit=None):
with self.Calculator(self, variable_binding, unit) as calc:
center_x = (calc.end_x + calc.start_x) / 2
center_y = (calc.end_y + calc.start_y) / 2
delta_x = calc.end_x - calc.start_x
delta_y = calc.end_y - calc.start_y
length = point_distance((calc.start_x, calc.start_y), (calc.end_x, calc.end_y))
center_x, center_y = center_x+offset[0], center_y+offset[1]
rotation += deg_to_rad(calc.rotation) + math.atan2(delta_y, delta_x)
return [ gp.Rectangle(center_x, center_y, length, calc.width, rotation=rotation,
polarity_dark=bool(calc.exposure)) ]
def dilate(self, offset, unit):
self.width += UnitExpression(2*offset, unit)
class CenterLine(Primitive):
code = 21
exposure : Expression
width : UnitExpression
height : UnitExpression
# center x/y
x : UnitExpression
y : UnitExpression
rotation : Expression
def to_graphic_primitives(self, offset, rotation, variable_binding={}, unit=None):
with self.Calculator(self, variable_binding, unit) as calc:
rotation += deg_to_rad(calc.rotation)
x, y = gp.rotate_point(calc.x, calc.y, rotation, 0, 0)
x, y = x+offset[0], y+offset[1]
w, h = calc.width, calc.height
return [ gp.Rectangle(x, y, w, h, rotation, polarity_dark=bool(calc.exposure)) ]
def dilate(self, offset, unit):
self.width += UnitExpression(2*offset, unit)
class Polygon(Primitive):
code = 5
exposure : Expression
n_vertices : Expression
# center x/y
x : UnitExpression
y : UnitExpression
diameter : UnitExpression
rotation : Expression
def to_graphic_primitives(self, offset, rotation, variable_binding={}, unit=None):
with self.Calculator(self, variable_binding, unit) as calc:
rotation += deg_to_rad(calc.rotation)
x, y = gp.rotate_point(calc.x, calc.y, rotation, 0, 0)
x, y = x+offset[0], y+offset[1]
return [ gp.RegularPolygon(calc.x, calc.y, calc.diameter/2, calc.n_vertices, rotation,
polarity_dark=bool(calc.exposure)) ]
def dilate(self, offset, unit):
self.diameter += UnitExpression(2*offset, unit)
class Thermal(Primitive):
code = 7
exposure : Expression
# center x/y
x : UnitExpression
y : UnitExpression
d_outer : UnitExpression
d_inner : UnitExpression
gap_w : UnitExpression
rotation : Expression
def to_graphic_primitives(self, offset, rotation, variable_binding={}, unit=None):
with self.Calculator(self, variable_binding, unit) as calc:
rotation += deg_to_rad(calc.rotation)
x, y = gp.rotate_point(calc.x, calc.y, rotation, 0, 0)
x, y = x+offset[0], y+offset[1]
dark = bool(calc.exposure)
return [
gp.Circle(x, y, calc.d_outer/2, polarity_dark=dark),
gp.Circle(x, y, calc.d_inner/2, polarity_dark=not dark),
gp.Rectangle(x, y, d_outer, gap_w, rotation=rotation, polarity_dark=not dark),
gp.Rectangle(x, y, gap_w, d_outer, rotation=rotation, polarity_dark=not dark),
]
def dilate(self, offset, unit):
# I'd rather print a warning and produce graphically slightly incorrect output in these few cases here than
# producing macros that may evaluate to primitives with negative values.
warnings.warn('Attempted dilation of macro aperture thermal primitive. This is not supported.')
class Outline(Primitive):
code = 4
def __init__(self, unit, args):
if len(args) < 11:
raise ValueError(f'Invalid aperture macro outline primitive, not enough parameters ({len(args)}).')
if len(args) > 5004:
raise ValueError(f'Invalid aperture macro outline primitive, too many points ({len(args)//2-2}).')
self.exposure = args[0]
# length arg must not contain variables (that would not make sense)
length_arg = args[1].calculate()
if length_arg != len(args)//2 - 2:
raise ValueError(f'Invalid aperture macro outline primitive, given size does not match length of coordinate list({len(args)}).')
if len(args) % 1 != 1:
self.rotation = args.pop()
else:
self.rotation = ConstantExpression(0.0)
if args[2] != args[-2] or args[3] != args[-1]:
raise ValueError(f'Invalid aperture macro outline primitive, polygon is not closed {args[2:4], args[-3:-1]}')
self.coords = [(UnitExpression(x, unit), UnitExpression(y, unit)) for x, y in zip(args[1::2], args[2::2])]
def to_gerber(self, unit=None):
coords = ','.join(coord.to_gerber(unit) for coord in self.coords)
return f'{self.code},{self.exposure.to_gerber()},{len(self.coords)//2-1},{coords},{self.rotation.to_gerber()}'
def to_graphic_primitives(self, offset, rotation, variable_binding={}, unit=None):
with self.Calculator(self, variable_binding, unit) as calc:
bound_coords = [ (calc(x)+offset[0], calc(y)+offset[1]) for x, y in self.coords ]
bound_radii = [None] * len(bound_coords)
rotation += deg_to_rad(calc.rotation)
bound_coords = [ gp.rotate_point(*p, rotation, 0, 0) for p in bound_coords ]
return [gp.ArcPoly(bound_coords, bound_radii, polarity_dark=calc.exposure)]
def dilate(self, offset, unit):
# we would need a whole polygon offset/clipping library here
warnings.warn('Attempted dilation of macro aperture outline primitive. This is not supported.')
class Comment:
code = 0
def __init__(self, comment):
self.comment = comment
def to_gerber(self, unit=None):
return f'0 {self.comment}'
PRIMITIVE_CLASSES = {
**{cls.code: cls for cls in [
Comment,
Circle,
VectorLine,
CenterLine,
Outline,
Polygon,
Thermal,
]},
# alternative codes
2: VectorLine,
}
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