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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.
"""
Rendering
============
**Gerber (RS-274X) and Excellon file rendering**
Render Gerber and Excellon files to a variety of formats. The render module
currently supports SVG rendering using the `svgwrite` library.
"""
from ..gerber_statements import (CommentStmt, UnknownStmt, EofStmt, ParamStmt,
CoordStmt, ApertureStmt, RegionModeStmt,
QuadrantModeStmt,
)
from ..primitives import *
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
----------
units : string
Measurement units
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`.
alpha : float
Rendering opacity. Between 0.0 (transparent) and 1.0 (opaque.)
"""
def __init__(self, units='inch'):
self.units = units
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)
self.alpha = 1.0
def set_units(self, units):
""" Set context measurement units
Parameters
----------
unit : string
Measurement units. may be 'inch' or 'metric'
Raises
------
ValueError
If `unit` is not 'inch' or 'metric'
"""
if units not in ('inch', 'metric'):
raise ValueError('Units may be "inch" or "metric"')
self.units = units
def set_color(self, color):
""" Set rendering color.
Parameters
----------
color : tuple (<float>, <float>, <float>)
Color as a tuple of (red, green, blue) values. Each channel is
represented as a float value in (0, 1)
"""
self.color = color
def set_drill_color(self, color):
""" Set color used for rendering drill hits.
Parameters
----------
color : tuple (<float>, <float>, <float>)
Color as a tuple of (red, green, blue) values. Each channel is
represented as a float value in (0, 1)
"""
self.drill_color = color
def set_background_color(self, color):
""" Set rendering background color
Parameters
----------
color : tuple (<float>, <float>, <float>)
Color as a tuple of (red, green, blue) values. Each channel is
represented as a float value in (0, 1)
"""
self.background_color = color
def set_alpha(self, alpha):
""" Set layer rendering opacity
.. note::
Not all backends/rendering devices support this parameter.
Parameters
----------
alpha : float
Rendering opacity. must be between 0.0 (transparent) and 1.0 (opaque)
"""
self.alpha = alpha
def render(self, primitive):
color = (self.color if primitive.level_polarity == 'dark'
else self.background_color)
if isinstance(primitive, Line):
self._render_line(primitive, color)
elif isinstance(primitive, Arc):
self._render_arc(primitive, color)
elif isinstance(primitive, Region):
self._render_region(primitive, color)
elif isinstance(primitive, Circle):
self._render_circle(primitive, color)
elif isinstance(primitive, Rectangle):
self._render_rectangle(primitive, color)
elif isinstance(primitive, Obround):
self._render_obround(primitive, color)
elif isinstance(primitive, Polygon):
self._render_polygon(Polygon, color)
elif isinstance(primitive, Drill):
self._render_drill(primitive, self.drill_color)
else:
return
def _render_line(self, primitive, color):
pass
def _render_arc(self, primitive, color):
pass
def _render_region(self, primitive, color):
pass
def _render_circle(self, primitive, color):
pass
def _render_rectangle(self, primitive, color):
pass
def _render_obround(self, primitive, color):
pass
def _render_polygon(self, primitive, color):
pass
def _render_drill(self, primitive, color):
pass
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