1 files changed, 382 insertions, 0 deletions
diff --git a/gerbonara/graphic_objects.py b/gerbonara/graphic_objects.py
new file mode 100644
index 0000000..1f475a6
--- /dev/null
+++ b/gerbonara/graphic_objects.py
@@ -0,0 +1,382 @@
+
+import math
+from dataclasses import dataclass, KW_ONLY, astuple, replace, field, fields
+
+from .utils import MM, InterpMode
+from . import graphic_primitives as gp
+
+
+def convert(value, src, dst):
+        if src == dst or src is None or dst is None or value is None:
+            return value
+        elif dst == MM:
+            return value * 25.4
+        else:
+            return value / 25.4
+
+class Length:
+    def __init__(self, obj_type):
+        self.type = obj_type
+
+@dataclass
+class GerberObject:
+    _ : KW_ONLY
+    polarity_dark : bool = True
+    unit : str = None
+    attrs : dict = field(default_factory=dict)
+
+    def converted(self, unit):
+        return replace(self, 
+                **{ f.name: self.unit.convert_to(unit, getattr(self, f.name))
+                    for f in fields(self) if type(f.type) is Length })
+
+    def with_offset(self, dx, dy, unit=MM):
+        dx, dy = self.unit(dx, unit), self.unit(dy, unit)
+        return self._with_offset(dx, dy)
+
+    def rotate(self, rotation, cx=0, cy=0, unit=MM):
+        cx, cy = self.unit(cx, unit), self.unit(cy, unit)
+        self._rotate(rotation, cx, cy)
+
+    def bounding_box(self, unit=None):
+        bboxes = [ p.bounding_box() for p in self.to_primitives(unit) ]
+        min_x = min(min_x for (min_x, _min_y), _ in bboxes)
+        min_y = min(min_y for (_min_x, min_y), _ in bboxes)
+        max_x = max(max_x for _, (max_x, _max_y) in bboxes)
+        max_y = max(max_y for _, (_max_x, max_y) in bboxes)
+        return ((min_x, min_y), (max_x, max_y))
+
+    def to_primitives(self, unit=None):
+        raise NotImplementedError()
+
+@dataclass
+class Flash(GerberObject):
+    x : Length(float)
+    y : Length(float)
+    aperture : object
+
+    @property
+    def tool(self):
+        return self.aperture
+
+    @tool.setter
+    def tool(self, value):
+        self.aperture = value
+
+    @property
+    def plated(self):
+        return self.tool.plated
+
+    def _with_offset(self, dx, dy):
+        return replace(self, x=self.x+dx, y=self.y+dy)
+
+    def _rotate(self, rotation, cx=0, cy=0):
+        self.x, self.y = gp.rotate_point(self.x, self.y, rotation, cx, cy)
+
+    def to_primitives(self, unit=None):
+        conv = self.converted(unit)
+        yield from self.aperture.flash(conv.x, conv.y, unit, self.polarity_dark)
+
+    def to_statements(self, gs):
+        yield from gs.set_polarity(self.polarity_dark)
+        yield from gs.set_aperture(self.aperture)
+
+        x = gs.file_settings.write_gerber_value(self.x, self.unit)
+        y = gs.file_settings.write_gerber_value(self.y, self.unit)
+        yield f'X{x}Y{y}D03*'
+
+        gs.update_point(self.x, self.y, unit=self.unit)
+
+    def to_xnc(self, ctx):
+        yield from ctx.select_tool(self.tool)
+        yield from ctx.drill_mode()
+
+        x = ctx.settings.write_excellon_value(self.x, self.unit)
+        y = ctx.settings.write_excellon_value(self.y, self.unit)
+        yield f'X{x}Y{y}'
+
+        ctx.set_current_point(self.unit, self.x, self.y)
+
+    def curve_length(self, unit=MM):
+        return 0
+
+
+class Region(GerberObject):
+    def __init__(self, outline=None, arc_centers=None, *, unit, polarity_dark):
+        super().__init__(unit=unit, polarity_dark=polarity_dark)
+        outline = [] if outline is None else outline
+        arc_centers = [] if arc_centers is None else arc_centers
+        self.poly = gp.ArcPoly(outline, arc_centers)
+
+    def __len__(self):
+        return len(self.poly)
+
+    def __bool__(self):
+        return bool(self.poly)
+
+    def _with_offset(self, dx, dy):
+        return Region([ (x+dx, y+dy) for x, y in self.poly.outline ],
+                self.poly.arc_centers,
+                polarity_dark=self.polarity_dark,
+                unit=self.unit)
+
+    def _rotate(self, angle, cx=0, cy=0):
+        self.poly.outline = [ gp.rotate_point(x, y, angle, cx, cy) for x, y in self.poly.outline ]
+        self.poly.arc_centers = [
+                (arc[0], gp.rotate_point(*arc[1], angle, cx-p[0], cy-p[1])) if arc else None
+                for p, arc in zip(self.poly.outline, self.poly.arc_centers) ]
+
+    def append(self, obj):
+        if obj.unit != self.unit:
+            raise ValueError('Cannot append Polyline with "{obj.unit}" coords to Region with "{self.unit}" coords.')
+        if not self.poly.outline:
+            self.poly.outline.append(obj.p1)
+        self.poly.outline.append(obj.p2)
+
+        if isinstance(obj, Arc):
+            self.poly.arc_centers.append((obj.clockwise, obj.center_relative))
+        else:
+            self.poly.arc_centers.append(None)
+
+    def to_primitives(self, unit=None):
+        self.poly.polarity_dark = self.polarity_dark # FIXME: is this the right spot to do this?
+        if unit == self.unit:
+            yield self.poly
+
+        else:
+            to = lambda value: self.unit.convert_to(unit, value)
+            conv_outline = [ (to(x), to(y)) for x, y in self.poly.outline ]
+            convert_entry = lambda entry: (entry[0], (to(entry[1][0]), to(entry[1][1])))
+            conv_arc = [ None if entry is None else convert_entry(entry) for entry in self.poly.arc_centers ]
+
+            yield gp.ArcPoly(conv_outline, conv_arc, polarity_dark=self.polarity_dark)
+
+    def to_statements(self, gs):
+        yield from gs.set_polarity(self.polarity_dark)
+        yield 'G36*'
+        # Repeat interpolation mode at start of region statement to work around gerbv bug. Without this, gerbv will
+        # not display a region consisting of only a single arc.
+        # TODO report gerbv issue upstream
+        yield gs.interpolation_mode_statement() + '*'
+
+        yield from gs.set_current_point(self.poly.outline[0], unit=self.unit)
+
+        for point, arc_center in zip(self.poly.outline[1:], self.poly.arc_centers):
+            if arc_center is None:
+                yield from gs.set_interpolation_mode(InterpMode.LINEAR)
+
+                x = gs.file_settings.write_gerber_value(point[0], self.unit)
+                y = gs.file_settings.write_gerber_value(point[1], self.unit)
+                yield f'X{x}Y{y}D01*'
+
+                gs.update_point(*point, unit=self.unit)
+
+            else:
+                clockwise, (cx, cy) = arc_center
+                x2, y2 = point
+                yield from gs.set_interpolation_mode(InterpMode.CIRCULAR_CW if clockwise else InterpMode.CIRCULAR_CCW)
+
+                x = gs.file_settings.write_gerber_value(x2, self.unit)
+                y = gs.file_settings.write_gerber_value(y2, self.unit)
+                # TODO are these coordinates absolute or relative now?!
+                i = gs.file_settings.write_gerber_value(cx, self.unit)
+                j = gs.file_settings.write_gerber_value(cy, self.unit)
+                yield f'X{x}Y{y}I{i}J{j}D01*'
+
+                gs.update_point(x2, y2, unit=self.unit)
+
+        yield 'G37*'
+
+@dataclass
+class Line(GerberObject):
+    # Line with *round* end caps.
+
+    x1 : Length(float)
+    y1 : Length(float)
+    x2 : Length(float)
+    y2 : Length(float)
+    aperture : object
+
+    def _with_offset(self, dx, dy):
+        return replace(self, x1=self.x1+dx, y1=self.y1+dy, x2=self.x2+dx, y2=self.y2+dy)
+
+    def _rotate(self, rotation, cx=0, cy=0):
+        self.x1, self.y1 = gp.rotate_point(self.x1, self.y1, rotation, cx, cy)
+        self.x2, self.y2 = gp.rotate_point(self.x2, self.y2, rotation, cx, cy)
+
+    @property
+    def p1(self):
+        return self.x1, self.y1
+
+    @property
+    def p2(self):
+        return self.x2, self.y2
+
+    @property
+    def end_point(self):
+        return self.p2
+
+    @property
+    def tool(self):
+        return self.aperture
+
+    @tool.setter
+    def tool(self, value):
+        self.aperture = value
+
+    @property
+    def plated(self):
+        return self.tool.plated
+
+    def to_primitives(self, unit=None):
+        conv = self.converted(unit)
+        w = self.aperture.equivalent_width(unit) if self.aperture else 0.1 # for debugging
+        yield gp.Line(*conv.p1, *conv.p2, w, polarity_dark=self.polarity_dark)
+
+    def to_statements(self, gs):
+        yield from gs.set_polarity(self.polarity_dark)
+        yield from gs.set_aperture(self.aperture)
+        yield from gs.set_interpolation_mode(InterpMode.LINEAR)
+        yield from gs.set_current_point(self.p1, unit=self.unit)
+
+        x = gs.file_settings.write_gerber_value(self.x2, self.unit)
+        y = gs.file_settings.write_gerber_value(self.y2, self.unit)
+        yield f'X{x}Y{y}D01*'
+
+        gs.update_point(*self.p2, unit=self.unit)
+
+    def to_xnc(self, ctx):
+        yield from ctx.select_tool(self.tool)
+        yield from ctx.route_mode(self.unit, *self.p1)
+
+        x = ctx.settings.write_excellon_value(self.x2, self.unit)
+        y = ctx.settings.write_excellon_value(self.y2, self.unit)
+        yield f'G01X{x}Y{y}'
+
+        ctx.set_current_point(self.unit, *self.p2)
+
+    def curve_length(self, unit=MM):
+        return self.unit.convert_to(unit, math.dist(self.p1, self.p2))
+
+
+@dataclass
+class Arc(GerberObject):
+    x1 : Length(float)
+    y1 : Length(float)
+    x2 : Length(float)
+    y2 : Length(float)
+    # relative to (x1, x2)
+    cx : Length(float)
+    cy : Length(float)
+    clockwise : bool
+    aperture : object
+    
+    def _with_offset(self, dx, dy):
+        return replace(self, x1=self.x1+dx, y1=self.y1+dy, x2=self.x2+dx, y2=self.y2+dy)
+
+    def numeric_error(self, unit=None):
+        conv = self.converted(unit)
+        cx, cy = conv.cx + conv.x1, conv.cy + conv.y1
+        r1 = math.dist((cx, cy), conv.p1)
+        r2 = math.dist((cx, cy), conv.p2)
+        return abs(r1 - r2)
+
+    def sweep_angle(self):
+        cx, cy = self.cx + self.x1, self.cy + self.y1
+        x1, y1 = self.x1 - cx, self.y1 - cy
+        x2, y2 = self.x2 - cx, self.y2 - cy
+
+        a1, a2 = math.atan2(y1, x1), math.atan2(y2, x2)
+        f = abs(a2 - a1)
+        if not self.clockwise:
+            if a2 > a1:
+                return a2 - a1
+            else:
+                return 2*math.pi - abs(a2 - a1)
+        else:
+            if a1 > a2:
+                return a1 - a2
+            else:
+                return 2*math.pi - abs(a1 - a2)
+
+    @property
+    def p1(self):
+        return self.x1, self.y1
+
+    @property
+    def p2(self):
+        return self.x2, self.y2
+
+    @property
+    def center(self):
+        return self.cx + self.x1, self.cy + self.y1
+
+    @property
+    def center_relative(self):
+        return self.cx, self.cy
+
+    @property
+    def end_point(self):
+        return self.p2
+
+    @property
+    def tool(self):
+        return self.aperture
+
+    @tool.setter
+    def tool(self, value):
+        self.aperture = value
+
+    @property
+    def plated(self):
+        return self.tool.plated
+
+    def _rotate(self, rotation, cx=0, cy=0):
+        # rotate center first since we need old x1, y1 here
+        new_cx, new_cy = gp.rotate_point(*self.center, rotation, cx, cy)
+        self.x1, self.y1 = gp.rotate_point(self.x1, self.y1, rotation, cx, cy)
+        self.x2, self.y2 = gp.rotate_point(self.x2, self.y2, rotation, cx, cy)
+        self.cx, self.cy = new_cx - self.x1, new_cy - self.y1
+
+    def to_primitives(self, unit=None):
+        conv = self.converted(unit)
+        w = self.aperture.equivalent_width(unit) if self.aperture else 0.1 # for debugging
+        yield gp.Arc(x1=conv.x1, y1=conv.y1,
+                x2=conv.x2, y2=conv.y2,
+                cx=conv.cx, cy=conv.cy,
+                clockwise=self.clockwise,
+                width=w,
+                polarity_dark=self.polarity_dark)
+
+    def to_statements(self, gs):
+        yield from gs.set_polarity(self.polarity_dark)
+        yield from gs.set_aperture(self.aperture)
+        # TODO is the following line correct?
+        yield from gs.set_interpolation_mode(InterpMode.CIRCULAR_CW if self.clockwise else InterpMode.CIRCULAR_CCW)
+        yield from gs.set_current_point(self.p1, unit=self.unit)
+
+        x = gs.file_settings.write_gerber_value(self.x2, self.unit)
+        y = gs.file_settings.write_gerber_value(self.y2, self.unit)
+        i = gs.file_settings.write_gerber_value(self.cx, self.unit)
+        j = gs.file_settings.write_gerber_value(self.cy, self.unit)
+        yield f'X{x}Y{y}I{i}J{j}D01*'
+
+        gs.update_point(*self.p2, unit=self.unit)
+
+    def to_xnc(self, ctx):
+        yield from ctx.select_tool(self.tool)
+        yield from ctx.route_mode(self.unit, self.x1, self.y1)
+        code = 'G02' if self.clockwise else 'G03'
+
+        x = ctx.settings.write_excellon_value(self.x2, self.unit)
+        y = ctx.settings.write_excellon_value(self.y2, self.unit)
+        i = ctx.settings.write_excellon_value(self.cx, self.unit)
+        j = ctx.settings.write_excellon_value(self.cy, self.unit)
+        yield f'{code}X{x}Y{y}I{i}J{j}'
+
+        ctx.set_current_point(self.unit, self.x2, self.y2)
+
+    def curve_length(self, unit=MM):
+        return self.unit.convert_to(unit, math.hypot(self.cx, self.cy) * self.sweep_angle)
+
+