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#! /usr/bin/env python
# -*- coding: utf-8 -*-
# copyright 2014 Hamilton Kibbe <ham@hamiltonkib.be>
# Modified from code by Paulo Henrique Silva <ph.silva@gmail.com>
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from ..gerber_statements import (CommentStmt, UnknownStmt, EofStmt, ParamStmt,
CoordStmt, ApertureStmt, RegionModeStmt,
QuadrantModeStmt,
)
class GerberContext(object):
""" Gerber rendering context base class
Provides basic functionality and API for rendering gerber files. Medium-
specific renderers should subclass GerberContext and implement the drawing
functions. Colors are stored internally as 32-bit RGB and may need to be
converted to a native format in the rendering subclass.
Attributes
----------
settings : FileSettings (dict-like)
Gerber file settings
x : float
X-coordinate of the "photoplotter" head.
y : float
Y-coordinate of the "photoplotter" head
aperture : int
The aperture that is currently in use
interpolation : str
Current interpolation mode. may be 'linear' or 'arc'
direction : string
Current arc direction. May be either 'clockwise' or 'counterclockwise'
image_polarity : string
Current image polarity setting. May be 'positive' or 'negative'
level_polarity : string
Level polarity. May be 'dark' or 'clear'. Dark polarity indicates the
existance of copper/silkscreen/etc. in the exposed area, whereas clear
polarity indicates material should be removed from the exposed area.
region_mode : string
Region mode. May be 'on' or 'off'. When region mode is set to 'on' the
following "contours" define the outline of a region. When region mode
is subsequently turned 'off', the defined area is filled.
quadrant_mode : string
Quadrant mode. May be 'single-quadrant' or 'multi-quadrant'. Defines
how arcs are specified.
color : tuple (<float>, <float>, <float>)
Color used for rendering as a tuple of normalized (red, green, blue) values.
drill_color : tuple (<float>, <float>, <float>)
Color used for rendering drill hits. Format is the same as for `color`.
background_color : tuple (<float>, <float>, <float>)
Color of the background. Used when exposing areas in 'clear' level
polarity mode. Format is the same as for `color`.
"""
def __init__(self):
self.settings = {}
self.x = 0
self.y = 0
self.aperture = 0
self.interpolation = 'linear'
self.direction = 'clockwise'
self.image_polarity = 'positive'
self.level_polarity = 'dark'
self.region_mode = 'off'
self.quadrant_mode = 'multi-quadrant'
self.color = (0.7215, 0.451, 0.200)
self.drill_color = (0.25, 0.25, 0.25)
self.background_color = (0.0, 0.0, 0.0)
def set_format(self, settings):
""" Set source file format.
Parameters
----------
settings : FileSettings instance or dict-like
Gerber file settings used in source file.
"""
self.settings = settings
def set_coord_format(self, zero_suppression, format, notation):
""" Set coordinate format used in source gerber file
Parameters
----------
zero_suppression : string
Zero suppression mode. may be 'leading' or 'trailling'
format : tuple (<int>, <int>)
decimal precision format
notation : string
notation mode. 'absolute' or 'incremental'
"""
self.settings['zero_suppression'] = zero_suppression
self.settings['format'] = format
self.settings['notation'] = notation
def set_coord_notation(self, notation):
self.settings['notation'] = notation
def set_coord_unit(self, unit):
self.settings['units'] = unit
def set_image_polarity(self, polarity):
self.image_polarity = polarity
def set_level_polarity(self, polarity):
self.level_polarity = polarity
def set_interpolation(self, interpolation):
self.interpolation = 'linear' if interpolation in ("G01", "G1") else 'arc'
def set_aperture(self, d):
self.aperture = d
def set_color(self, color):
self.color = color
def set_drill_color(self, color):
self.drill_color = color
def set_background_color(self, color):
self.background_color = color
def resolve(self, x, y):
x = x if x is not None else self.x
y = y if y is not None else self.y
return x, y
def define_aperture(self, d, shape, modifiers):
pass
def move(self, x, y, resolve=True):
if resolve:
self.x, self.y = self.resolve(x, y)
else:
self.x, self.y = x, y
def stroke(self, x, y, i, j):
pass
def line(self, x, y):
pass
def arc(self, x, y, i, j):
pass
def flash(self, x, y):
pass
def drill(self, x, y, diameter):
pass
def evaluate(self, stmt):
if isinstance(stmt, (CommentStmt, UnknownStmt, EofStmt)):
return
elif isinstance(stmt, ParamStmt):
self._evaluate_param(stmt)
elif isinstance(stmt, CoordStmt):
self._evaluate_coord(stmt)
elif isinstance(stmt, ApertureStmt):
self._evaluate_aperture(stmt)
elif isinstance(stmt, (RegionModeStmt, QuadrantModeStmt)):
self._evaluate_mode(stmt)
else:
raise Exception("Invalid statement to evaluate")
def _evaluate_mode(self, stmt):
if stmt.type == 'RegionMode':
if self.region_mode == 'on' and stmt.mode == 'off':
self._fill_region()
self.region_mode = stmt.mode
elif stmt.type == 'QuadrantMode':
self.quadrant_mode = stmt.mode
def _evaluate_param(self, stmt):
if stmt.param == "FS":
self.set_coord_format(stmt.zero_suppression, stmt.format,
stmt.notation)
self.set_coord_notation(stmt.notation)
elif stmt.param == "MO:":
self.set_coord_unit(stmt.mode)
elif stmt.param == "IP:":
self.set_image_polarity(stmt.ip)
elif stmt.param == "LP:":
self.set_level_polarity(stmt.lp)
elif stmt.param == "AD":
self.define_aperture(stmt.d, stmt.shape, stmt.modifiers)
def _evaluate_coord(self, stmt):
if stmt.function in ("G01", "G1", "G02", "G2", "G03", "G3"):
self.set_interpolation(stmt.function)
if stmt.function not in ('G01', 'G1'):
self.direction = ('clockwise' if stmt.function in ('G02', 'G2')
else 'counterclockwise')
if stmt.op == "D01":
self.stroke(stmt.x, stmt.y, stmt.i, stmt.j)
elif stmt.op == "D02":
self.move(stmt.x, stmt.y)
elif stmt.op == "D03":
self.flash(stmt.x, stmt.y)
def _evaluate_aperture(self, stmt):
self.set_aperture(stmt.d)
def _fill_region(self):
pass
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