diff options
Diffstat (limited to 'gerber/render/rs274x_backend.py')
| -rw-r--r-- | gerber/render/rs274x_backend.py | 495 |
1 files changed, 495 insertions, 0 deletions
diff --git a/gerber/render/rs274x_backend.py b/gerber/render/rs274x_backend.py new file mode 100644 index 0000000..b4b4612 --- /dev/null +++ b/gerber/render/rs274x_backend.py @@ -0,0 +1,495 @@ +"""Renders an in-memory Gerber file to statements which can be written to a string +""" +from copy import deepcopy + +try: + from cStringIO import StringIO +except(ImportError): + from io import StringIO + +from .render import GerberContext +from ..am_statements import * +from ..gerber_statements import * +from ..primitives import AMGroup, Arc, Circle, Line, Obround, Outline, Polygon, Rectangle + + +class AMGroupContext(object): + '''A special renderer to generate aperature macros from an AMGroup''' + + def __init__(self): + self.statements = [] + + def render(self, amgroup, name): + + if amgroup.stmt: + # We know the statement it was generated from, so use that to create the AMParamStmt + # It will give a much better result + + stmt = deepcopy(amgroup.stmt) + stmt.name = name + + return stmt + + else: + # Clone ourselves, then offset by the psotion so that + # our render doesn't have to consider offset. Just makes things simpler + nooffset_group = deepcopy(amgroup) + nooffset_group.position = (0, 0) + + # Now draw the shapes + for primitive in nooffset_group.primitives: + if isinstance(primitive, Outline): + self._render_outline(primitive) + elif isinstance(primitive, Circle): + self._render_circle(primitive) + elif isinstance(primitive, Rectangle): + self._render_rectangle(primitive) + elif isinstance(primitive, Line): + self._render_line(primitive) + elif isinstance(primitive, Polygon): + self._render_polygon(primitive) + else: + raise ValueError('amgroup') + + statement = AMParamStmt('AM', name, self._statements_to_string()) + return statement + + def _statements_to_string(self): + macro = '' + + for statement in self.statements: + macro += statement.to_gerber() + + return macro + + def _render_circle(self, circle): + self.statements.append(AMCirclePrimitive.from_primitive(circle)) + + def _render_rectangle(self, rectangle): + self.statements.append(AMCenterLinePrimitive.from_primitive(rectangle)) + + def _render_line(self, line): + self.statements.append(AMVectorLinePrimitive.from_primitive(line)) + + def _render_outline(self, outline): + self.statements.append(AMOutlinePrimitive.from_primitive(outline)) + + def _render_polygon(self, polygon): + self.statements.append(AMPolygonPrimitive.from_primitive(polygon)) + + def _render_thermal(self, thermal): + pass + + +class Rs274xContext(GerberContext): + + def __init__(self, settings): + GerberContext.__init__(self) + self.comments = [] + self.header = [] + self.body = [] + self.end = [EofStmt()] + + # Current values so we know if we have to execute + # moves, levey changes before anything else + self._level_polarity = None + self._pos = (None, None) + self._func = None + self._quadrant_mode = None + self._dcode = None + + # Primarily for testing and comarison to files, should we write + # flashes as a single statement or a move plus flash? Set to true + # to do in a single statement. Normally this can be false + self.condensed_flash = True + + # When closing a region, force a D02 staement to close a region. + # This is normally not necessary because regions are closed with a G37 + # staement, but this will add an extra statement for doubly close + # the region + self.explicit_region_move_end = False + + self._next_dcode = 10 + self._rects = {} + self._circles = {} + self._obrounds = {} + self._polygons = {} + self._macros = {} + + self._i_none = 0 + self._j_none = 0 + + self.settings = settings + + self._start_header(settings) + + def _start_header(self, settings): + self.header.append(FSParamStmt.from_settings(settings)) + self.header.append(MOParamStmt.from_units(settings.units)) + + def _simplify_point(self, point): + return (point[0] if point[0] != self._pos[0] else None, point[1] if point[1] != self._pos[1] else None) + + def _simplify_offset(self, point, offset): + + if point[0] != offset[0]: + xoffset = point[0] - offset[0] + else: + xoffset = self._i_none + + if point[1] != offset[1]: + yoffset = point[1] - offset[1] + else: + yoffset = self._j_none + + return (xoffset, yoffset) + + @property + def statements(self): + return self.comments + self.header + self.body + self.end + + def set_bounds(self, bounds): + pass + + def _paint_background(self): + pass + + def _select_aperture(self, aperture): + + # Select the right aperture if not already selected + if aperture: + if isinstance(aperture, Circle): + aper = self._get_circle(aperture.diameter, aperture.hole_diameter) + elif isinstance(aperture, Rectangle): + aper = self._get_rectangle(aperture.width, aperture.height) + elif isinstance(aperture, Obround): + aper = self._get_obround(aperture.width, aperture.height) + elif isinstance(aperture, AMGroup): + aper = self._get_amacro(aperture) + else: + raise NotImplementedError('Line with invalid aperture type') + + if aper.d != self._dcode: + self.body.append(ApertureStmt(aper.d)) + self._dcode = aper.d + + def _pre_render_primitive(self, primitive): + + if hasattr(primitive, 'comment'): + self.body.append(CommentStmt(primitive.comment)) + + def _render_line(self, line, color): + + self._select_aperture(line.aperture) + + self._render_level_polarity(line) + + # Get the right function + if self._func != CoordStmt.FUNC_LINEAR: + func = CoordStmt.FUNC_LINEAR + else: + func = None + self._func = CoordStmt.FUNC_LINEAR + + if self._pos != line.start: + self.body.append(CoordStmt.move(func, self._simplify_point(line.start))) + self._pos = line.start + # We already set the function, so the next command doesn't require that + func = None + + point = self._simplify_point(line.end) + + # In some files, we see a lot of duplicated ponts, so omit those + if point[0] != None or point[1] != None: + self.body.append(CoordStmt.line(func, self._simplify_point(line.end))) + self._pos = line.end + elif func: + self.body.append(CoordStmt.mode(func)) + + def _render_arc(self, arc, color): + + # Optionally set the quadrant mode if it has changed: + if arc.quadrant_mode != self._quadrant_mode: + + if arc.quadrant_mode != 'multi-quadrant': + self.body.append(QuadrantModeStmt.single()) + else: + self.body.append(QuadrantModeStmt.multi()) + + self._quadrant_mode = arc.quadrant_mode + + # Select the right aperture if not already selected + self._select_aperture(arc.aperture) + + self._render_level_polarity(arc) + + # Find the right movement mode. Always set to be sure it is really right + dir = arc.direction + if dir == 'clockwise': + func = CoordStmt.FUNC_ARC_CW + self._func = CoordStmt.FUNC_ARC_CW + elif dir == 'counterclockwise': + func = CoordStmt.FUNC_ARC_CCW + self._func = CoordStmt.FUNC_ARC_CCW + else: + raise ValueError('Invalid circular interpolation mode') + + if self._pos != arc.start: + # TODO I'm not sure if this is right + self.body.append(CoordStmt.move(CoordStmt.FUNC_LINEAR, self._simplify_point(arc.start))) + self._pos = arc.start + + center = self._simplify_offset(arc.center, arc.start) + end = self._simplify_point(arc.end) + self.body.append(CoordStmt.arc(func, end, center)) + self._pos = arc.end + + def _render_region(self, region, color): + + self._render_level_polarity(region) + + self.body.append(RegionModeStmt.on()) + + for p in region.primitives: + + if isinstance(p, Line): + self._render_line(p, color) + else: + self._render_arc(p, color) + + if self.explicit_region_move_end: + self.body.append(CoordStmt.move(None, None)) + + self.body.append(RegionModeStmt.off()) + + def _render_level_polarity(self, region): + if region.level_polarity != self._level_polarity: + self._level_polarity = region.level_polarity + self.body.append(LPParamStmt.from_region(region)) + + def _render_flash(self, primitive, aperture): + + self._render_level_polarity(primitive) + + if aperture.d != self._dcode: + self.body.append(ApertureStmt(aperture.d)) + self._dcode = aperture.d + + if self.condensed_flash: + self.body.append(CoordStmt.flash(self._simplify_point(primitive.position))) + else: + self.body.append(CoordStmt.move(None, self._simplify_point(primitive.position))) + self.body.append(CoordStmt.flash(None)) + + self._pos = primitive.position + + def _get_circle(self, diameter, hole_diameter, dcode = None): + '''Define a circlar aperture''' + + aper = self._circles.get((diameter, hole_diameter), None) + + if not aper: + if not dcode: + dcode = self._next_dcode + self._next_dcode += 1 + else: + self._next_dcode = max(dcode + 1, self._next_dcode) + + aper = ADParamStmt.circle(dcode, diameter, hole_diameter) + self._circles[(diameter, hole_diameter)] = aper + self.header.append(aper) + + return aper + + def _render_circle(self, circle, color): + + aper = self._get_circle(circle.diameter, circle.hole_diameter) + self._render_flash(circle, aper) + + def _get_rectangle(self, width, height, dcode = None): + '''Get a rectanglar aperture. If it isn't defined, create it''' + + key = (width, height) + aper = self._rects.get(key, None) + + if not aper: + if not dcode: + dcode = self._next_dcode + self._next_dcode += 1 + else: + self._next_dcode = max(dcode + 1, self._next_dcode) + + aper = ADParamStmt.rect(dcode, width, height) + self._rects[(width, height)] = aper + self.header.append(aper) + + return aper + + def _render_rectangle(self, rectangle, color): + + aper = self._get_rectangle(rectangle.width, rectangle.height) + self._render_flash(rectangle, aper) + + def _get_obround(self, width, height, dcode = None): + + key = (width, height) + aper = self._obrounds.get(key, None) + + if not aper: + if not dcode: + dcode = self._next_dcode + self._next_dcode += 1 + else: + self._next_dcode = max(dcode + 1, self._next_dcode) + + aper = ADParamStmt.obround(dcode, width, height) + self._obrounds[key] = aper + self.header.append(aper) + + return aper + + def _render_obround(self, obround, color): + + aper = self._get_obround(obround.width, obround.height) + self._render_flash(obround, aper) + + def _render_polygon(self, polygon, color): + + aper = self._get_polygon(polygon.radius, polygon.sides, polygon.rotation, polygon.hole_radius) + self._render_flash(polygon, aper) + + def _get_polygon(self, radius, num_vertices, rotation, hole_radius, dcode = None): + + key = (radius, num_vertices, rotation, hole_radius) + aper = self._polygons.get(key, None) + + if not aper: + if not dcode: + dcode = self._next_dcode + self._next_dcode += 1 + else: + self._next_dcode = max(dcode + 1, self._next_dcode) + + aper = ADParamStmt.polygon(dcode, radius * 2, num_vertices, rotation, hole_radius * 2) + self._polygons[key] = aper + self.header.append(aper) + + return aper + + def _render_drill(self, drill, color): + raise ValueError('Drills are not valid in RS274X files') + + def _hash_amacro(self, amgroup): + '''Calculate a very quick hash code for deciding if we should even check AM groups for comparision''' + + # We always start with an X because this forms part of the name + # Basically, in some cases, the name might start with a C, R, etc. That can appear + # to conflict with normal aperture definitions. Technically, it shouldn't because normal + # aperture definitions should have a comma, but in some cases the commit is omitted + hash = 'X' + for primitive in amgroup.primitives: + + hash += primitive.__class__.__name__[0] + + bbox = primitive.bounding_box + hash += str((bbox[0][1] - bbox[0][0]) * 100000)[0:2] + hash += str((bbox[1][1] - bbox[1][0]) * 100000)[0:2] + + if hasattr(primitive, 'primitives'): + hash += str(len(primitive.primitives)) + + if isinstance(primitive, Rectangle): + hash += str(primitive.width * 1000000)[0:2] + hash += str(primitive.height * 1000000)[0:2] + elif isinstance(primitive, Circle): + hash += str(primitive.diameter * 1000000)[0:2] + + if len(hash) > 20: + # The hash might actually get quite complex, so stop before + # it gets too long + break + + return hash + + def _get_amacro(self, amgroup, dcode = None): + # Macros are a little special since we don't have a good way to compare them quickly + # but in most cases, this should work + + hash = self._hash_amacro(amgroup) + macro = None + macroinfo = self._macros.get(hash, None) + + if macroinfo: + + # We have a definition, but check that the groups actually are the same + for macro in macroinfo: + + # Macros should have positions, right? But if the macro is selected for non-flashes + # then it won't have a position. This is of course a bad gerber, but they do exist + if amgroup.position: + position = amgroup.position + else: + position = (0, 0) + + offset = (position[0] - macro[1].position[0], position[1] - macro[1].position[1]) + if amgroup.equivalent(macro[1], offset): + break + macro = None + + # Did we find one in the group0 + if not macro: + # This is a new macro, so define it + if not dcode: + dcode = self._next_dcode + self._next_dcode += 1 + else: + self._next_dcode = max(dcode + 1, self._next_dcode) + + # Create the statements + # TODO + amrenderer = AMGroupContext() + statement = amrenderer.render(amgroup, hash) + + self.header.append(statement) + + aperdef = ADParamStmt.macro(dcode, hash) + self.header.append(aperdef) + + # Store the dcode and the original so we can check if it really is the same + # If it didn't have a postition, set it to 0, 0 + if amgroup.position == None: + amgroup.position = (0, 0) + macro = (aperdef, amgroup) + + if macroinfo: + macroinfo.append(macro) + else: + self._macros[hash] = [macro] + + return macro[0] + + def _render_amgroup(self, amgroup, color): + + aper = self._get_amacro(amgroup) + self._render_flash(amgroup, aper) + + def _render_inverted_layer(self): + pass + + def _new_render_layer(self): + # TODO Might need to implement this + pass + + def _flatten(self): + # TODO Might need to implement this + pass + + def dump(self): + """Write the rendered file to a StringIO steam""" + statements = map(lambda stmt: stmt.to_gerber(self.settings), self.statements) + stream = StringIO() + for statement in statements: + stream.write(statement + '\n') + + return stream +
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