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import math
import itertools
from dataclasses import dataclass, KW_ONLY, replace
from gerber_statements import *
class GraphicPrimitive:
_ : KW_ONLY
polarity_dark : bool = True
def rotate_point(x, y, angle, cx=None, cy=None):
if cx is None:
return (x, y)
else:
return (cx + (x - cx) * math.cos(angle) - (y - cy) * math.sin(angle),
cy + (x - cx) * math.sin(angle) + (y - cy) * math.cos(angle))
@dataclass
class Circle(GraphicPrimitive):
x : float
y : float
r : float # Here, we use radius as common in modern computer graphics, not diameter as gerber uses.
def bounds(self):
return ((self.x-self.r, self.y-self.r), (self.x+self.r, self.y+self.r))
@dataclass
class Obround(GraphicPrimitive):
x : float
y : float
w : float
h : float
rotation : float # radians!
def decompose(self):
''' decompose obround to two circles and one rectangle '''
cx = self.x + self.w/2
cy = self.y + self.h/2
if self.w > self.h:
x = self.x + self.h/2
yield Circle(x, cy, self.h/2)
yield Circle(x + self.w, cy, self.h/2)
yield Rectangle(x, self.y, self.w - self.h, self.h)
elif self.h > self.w:
y = self.y + self.w/2
yield Circle(cx, y, self.w/2)
yield Circle(cx, y + self.h, self.w/2)
yield Rectangle(self.x, y, self.w, self.h - self.w)
else:
yield Circle(cx, cy, self.w/2)
def bounds(self):
return ((self.x-self.w/2, self.y-self.h/2), (self.x+self.w/2, self.y+self.h/2))
@dataclass
class ArcPoly(GraphicPrimitive):
""" Polygon whose sides may be either straight lines or circular arcs """
# list of (x : float, y : float) tuples. Describes closed outline, i.e. first and last point are considered
# connected.
outline : list(tuple(float))
# list of radii of segments, must be either None (all segments are straight lines) or same length as outline.
# Straight line segments have None entry.
arc_centers : list(tuple(float))
@property
def segments(self):
return itertools.zip_longest(self.outline[:-1], self.outline[1:], self.radii or [])
def bounds(self):
for (x1, y1), (x2, y2), radius in self.segments:
return
@dataclass
class Line(GraphicPrimitive):
x1 : float
y1 : float
x2 : float
y2 : float
width : float
# FIXME bounds
@dataclass
class Arc(GraphicPrimitive):
x : float
y : float
r : float
angle1 : float # radians!
angle2 : float # radians!
width : float
# FIXME bounds
@dataclass
class Rectangle(GraphicPrimitive):
# coordinates are center coordinates
x : float
y : float
w : float
h : float
rotation : float # radians, around center!
def bounds(self):
return ((self.x, self.y), (self.x+self.w, self.y+self.h))
@prorperty
def center(self):
return self.x + self.w/2, self.y + self.h/2
class RegularPolygon(GraphicPrimitive):
x : float
y : float
r : float
n : int
rotation : float # radians!
def decompose(self):
''' convert n-sided gerber polygon to normal Region defined by outline '''
delta = 2*math.pi / self.n
yield Region([
(self.x + math.cos(self.rotation + i*delta) * self.r,
self.y + math.sin(self.rotation + i*delta) * self.r)
for i in range(self.n) ])
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