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authorjaseg <git@jaseg.de>2023-04-04 14:05:54 +0200
committerjaseg <git@jaseg.de>2023-04-04 14:05:54 +0200
commita8772612568a81d204705cb8b4a43bf5868cee40 (patch)
tree821fe1f048f5c3ed91f4fdb373aeaca345309994 /gerbonara/cad
parentdb2bacebc74fedc7a60cf2621f8448f1f4b7f10a (diff)
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cad: Add trace corner rounding function
Diffstat (limited to 'gerbonara/cad')
-rw-r--r--gerbonara/cad/primitives.py158
1 files changed, 137 insertions, 21 deletions
diff --git a/gerbonara/cad/primitives.py b/gerbonara/cad/primitives.py
index d232d20..65080d8 100644
--- a/gerbonara/cad/primitives.py
+++ b/gerbonara/cad/primitives.py
@@ -4,7 +4,7 @@ from copy import copy
from itertools import zip_longest
from dataclasses import dataclass, field, KW_ONLY
-from ..utils import LengthUnit, MM, rotate_point
+from ..utils import LengthUnit, MM, rotate_point, svg_arc
from ..layers import LayerStack
from ..graphic_objects import Line, Arc, Flash
from ..apertures import Aperture, CircleAperture, RectangleAperture, ExcellonTool
@@ -151,7 +151,6 @@ class Trace:
if self.style == 'direct' or \
math.isclose(x1, x2, abs_tol=1e-6) or math.isclose(y1, y2, abs_tol=1e-6) or \
(self.style == 'oblique' and math.isclose(dx, dy, abs_tol=1e-6)):
- yield p2
return
p = (abs(dy) > abs(dx)) == ((dx >= 0) == (dy >= 0))
@@ -166,6 +165,7 @@ class Trace:
yield (dx, sgn(dy)*abs(dx))
else:
yield (sgn(dx)*abs(dy), dy)
+
else: # self.style == 'ortho'
if p == (orientation == 'cw'):
if abs(dy) > abs(dx):
@@ -178,9 +178,100 @@ class Trace:
else:
yield (0, dy)
- yield p2
+ @classmethod
+ def _midpoint(kls, p1, p2):
+ x1, y1 = p1
+ x2, y2 = p2
+ dx = x2 - x1
+ dy = y2 - y1
+ xm = x1 + dx / 2
+ ym = y1 + dy / 2
+ return (xm, ym)
+
+ @classmethod
+ def _point_on_line(kls, p1, p2, dist_from_p1):
+ x1, y1 = p1
+ x2, y2 = p2
+ dx = x2 - x1
+ dy = y2 - y1
+ dist = math.dist(p1, p2)
+ if math.isclose(dist, 0, abs_tol=1e-6):
+ return p2
+ xm = x1 + dx / dist * dist_from_p1
+ ym = y1 + dy / dist * dist_from_p1
+ return (xm, ym)
+
+ @classmethod
+ def _angle_between(kls, p1, p2, p3):
+ x1, y1 = p1
+ x2, y2 = p2
+ x3, y3 = p3
+ x1, y1 = x1 - x2, y1 - y2
+ x3, y3 = x3 - x2, y3 - y2
+ dot_product = x1*x3 + y1*y3
+ l1 = math.hypot(x1, y1)
+ l2 = math.hypot(x3, y3)
+ norm = dot_product / l1 / l2
+ return math.acos(min(1, max(-1, norm)))
+
+ def _round_over(self, points, aperture):
+ if math.isclose(self.roundover, 0, abs_tol=1e-6) or len(points) <= 2:
+ for p1, p2 in zip(points[:-1], points[1:]):
+ yield Line(*p1, *p2, aperture=aperture, unit=self.unit)
+ return
+ # here: len(points) >= 3
+
+ line_b = Line(*points[0], *self._midpoint(points[0], points[1]), aperture=aperture, unit=self.unit)
+
+ for p1, p2, p3 in zip(points[:-2], points[1:-1], points[2:]):
+ x1, y1 = p1
+ x2, y2 = p2
+ x3, y3 = p3
+ xa, ya = pa = self._midpoint(p1, p2)
+ xb, yb = pb = self._midpoint(p2, p3)
+ la = math.dist(pa, p2)
+ lb = math.dist(p2, pb)
+
+ alpha = self._angle_between(p1, p2, p3)
+ tr = self.roundover/math.tan(alpha/2)
+ t = min(la, lb, tr)
+ r = t*math.tan(alpha/2)
+
+ xs, ys = ps = self._point_on_line(p2, pa, t)
+ xe, ye = pe = self._point_on_line(p2, pb, t)
+
+ if math.isclose(t, la, abs_tol=1e-6):
+ if not math.isclose(line_b.curve_length(), 0, abs_tol=1e-6):
+ yield line_b
+ xs, ys = ps = pa
+ else:
+ yield Line(line_b.x1, line_b.y1, xs, ys, aperture=aperture, unit=self.unit)
+
+ if math.isclose(t, lb, abs_tol=1e-6):
+ xe, ye = pe = pb
+ line_b = Line(*pe, *pb, aperture=aperture, unit=self.unit)
+
+ if math.isclose(r, 0, abs_tol=1e-6):
+ continue
+
+ xc = -(y2 - ys) / t * r
+ yc = +(x2 - xs) / t * r
+
+ xsr = xs - x2
+ ysr = ys - y2
+ xer = xe - x2
+ yer = ye - y2
+ cross_product_z = xsr * yer - ysr * xer
+
+ clockwise = cross_product_z > 0
+ if clockwise:
+ xc, yc = -xc, -yc
+
+ yield Arc(*ps, *pe, xc, yc, clockwise, aperture=aperture, unit=self.unit)
+
+ yield Line(line_b.x1, line_b.y1, x3, y3, aperture=aperture, unit=self.unit)
- def to_layer_stack(self, layer_stack, x, y, rotation):
+ def _to_graphic_objects(self):
start, end = self.start, self.end
if not isinstance(start, tuple):
@@ -188,27 +279,42 @@ class Trace:
if not isinstance(end, tuple):
end = end.abs_pos
- points = [start, *self.waypoints, end]
aperture = CircleAperture(diameter=self.width, unit=self.unit)
- for p1, p2, orientation in zip_longest(points[:-1], points[1:], self.orientation):
- layer_stack[self.side, 'copper'].extend(self._route(p1, p2, orientation, aperture))
+ points_in = [start, *self.waypoints, end]
+
+ points = []
+ for p1, p2, orientation in zip_longest(points_in[:-1], points_in[1:], self.orientation):
+ points.extend(self._route(p1, p2, orientation))
+ points.append(p2)
+
+ return self._round_over(points, aperture)
+
+ def to_layer_stack(self, layer_stack, x, y, rotation):
+ layer_stack[self.side, 'copper'].objects.extend(self._to_graphic_objects())
if __name__ == '__main__':
from ..utils import setup_svg, Tag
from ..newstroke import Newstroke
+ def pd_obj(objs):
+ objs = list(objs)
+ yield f'M {objs[0].x1}, {objs[0].y1}'
+ for obj in objs:
+ if isinstance(obj, Line):
+ yield f'L {obj.x2}, {obj.y2}'
+ else:
+ assert isinstance(obj, Arc)
+ yield svg_arc(obj.p1, obj.p2, obj.center_relative, obj.clockwise)
+
+ pd = lambda points: f'M {points[0][0]}, {points[0][1]} ' + ' '.join(f'L {x}, {y}' for x, y in points[1:])
+
font = Newstroke()
tags = []
for n in range(0, 8*6):
theta = 2*math.pi / (8*6) * n
dx, dy = math.cos(theta), math.sin(theta)
- tr = Trace(0.1, style='oblique')
- points_cw = list(tr._route((0, 0), (dx, dy), 'cw'))
- points_ccw = list(tr._route((0, 0), (dx, dy), 'ccw'))
-
- pd = lambda points: f'M {points[0][0]}, {points[0][1]} ' + ' '.join(f'L {x}, {y}' for x, y in points[1:])
strokes = list(font.render(f'α={n/(8*6)*360}', size=0.2))
xs = [x for st in strokes for x, _y in st]
@@ -219,21 +325,31 @@ if __name__ == '__main__':
txf = f'{xf} translate(0 -1.2) translate({-(max_x-min_x)/2} {-max_y})'
tags.append(Tag('circle', cx='0', cy='0', r='1',
- fill='none', stroke='black', opacity='0.5', stroke_width='0.05',
+ fill='none', stroke='black', opacity='0.5', stroke_width='0.01',
transform=xf))
tags.append(Tag('path',
fill='none',
- stroke='red', opacity='0.5', stroke_width='0.05', stroke_linecap='round',
- transform=xf, d=pd(points_cw)))
- tags.append(Tag('path',
- fill='none',
- stroke='blue', opacity='0.5', stroke_width='0.05', stroke_linecap='round',
- transform=xf, d=pd(points_ccw)))
- tags.append(Tag('path',
- fill='none',
stroke='black', opacity='0.5', stroke_width='0.02', stroke_linejoin='round', stroke_linecap='round',
transform=txf, d=' '.join(pd(points) for points in strokes)))
+ for r in [0.0, 0.1, 0.2, 0.3]:
+ tr = Trace(0.1, style='ortho', roundover=r, start=(0, 0), end=(dx, dy))
+ #points_cw = list(tr._route((0, 0), (dx, dy), 'cw')) + [(dx, dy)]
+ #points_ccw = list(tr._route((0, 0), (dx, dy), 'ccw')) + [(dx, dy)]
+ tr.orientation = ['cw']
+ objs_cw = tr._to_graphic_objects()
+ tr.orientation = ['ccw']
+ objs_ccw = tr._to_graphic_objects()
+
+ tags.append(Tag('path',
+ fill='none',
+ stroke='red', stroke_width='0.01', stroke_linecap='round',
+ transform=xf, d=' '.join(pd_obj(objs_cw))))
+ tags.append(Tag('path',
+ fill='none',
+ stroke='blue', stroke_width='0.01', stroke_linecap='round',
+ transform=xf, d=' '.join(pd_obj(objs_ccw))))
+
print(setup_svg([Tag('g', tags, transform='scale(20 20)')], [(0, 0), (20*10*1.1 + 0.1, 20*10*1.3 + 0.1)]))