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#! /usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 2014 Hamilton Kibbe <ham@hamiltonkib.be>
# 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.
import cairocffi as cairo
import tempfile
import copy
from .render import GerberContext, RenderSettings
from .theme import THEMES
from ..primitives import *
try:
from cStringIO import StringIO
except(ImportError):
from io import StringIO
class GerberCairoContext(GerberContext):
def __init__(self, scale=300):
super(GerberCairoContext, self).__init__()
self.scale = (scale, scale)
self.surface = None
self.ctx = None
self.active_layer = None
self.active_matrix = None
self.output_ctx = None
self.bg = False
self.mask = None
self.mask_ctx = None
self.origin_in_inch = None
self.size_in_inch = None
self._xform_matrix = None
@property
def origin_in_pixels(self):
return (self.scale_point(self.origin_in_inch)
if self.origin_in_inch is not None else (0.0, 0.0))
@property
def size_in_pixels(self):
return (self.scale_point(self.size_in_inch)
if self.size_in_inch is not None else (0.0, 0.0))
def set_bounds(self, bounds, new_surface=False):
origin_in_inch = (bounds[0][0], bounds[1][0])
size_in_inch = (abs(bounds[0][1] - bounds[0][0]),
abs(bounds[1][1] - bounds[1][0]))
size_in_pixels = self.scale_point(size_in_inch)
self.origin_in_inch = origin_in_inch if self.origin_in_inch is None else self.origin_in_inch
self.size_in_inch = size_in_inch if self.size_in_inch is None else self.size_in_inch
if (self.surface is None) or new_surface:
self.surface_buffer = tempfile.NamedTemporaryFile()
self.surface = cairo.SVGSurface(
self.surface_buffer, size_in_pixels[0], size_in_pixels[1])
self.output_ctx = cairo.Context(self.surface)
self.output_ctx.set_fill_rule(cairo.FILL_RULE_EVEN_ODD)
self.output_ctx.scale(1, -1)
self.output_ctx.translate(-(origin_in_inch[0] * self.scale[0]),
(-origin_in_inch[1] * self.scale[0]) - size_in_pixels[1])
self._xform_matrix = cairo.Matrix(xx=1.0, yy=-1.0,
x0=-self.origin_in_pixels[0],
y0=self.size_in_pixels[1] + self.origin_in_pixels[1])
def render_layers(self, layers, filename, theme=THEMES['default']):
""" Render a set of layers
"""
self.set_bounds(layers[0].bounds, True)
self._paint_background(True)
for layer in layers:
self._render_layer(layer, theme)
self.dump(filename)
def dump(self, filename):
""" Save image as `filename`
"""
is_svg = filename.lower().endswith(".svg")
if is_svg:
self.surface.finish()
self.surface_buffer.flush()
with open(filename, "w") as f:
self.surface_buffer.seek(0)
f.write(self.surface_buffer.read())
f.flush()
else:
self.surface.write_to_png(filename)
def dump_str(self):
""" Return a string containing the rendered image.
"""
fobj = StringIO()
self.surface.write_to_png(fobj)
return fobj.getvalue()
def dump_svg_str(self):
""" Return a string containg the rendered SVG.
"""
self.surface.finish()
self.surface_buffer.flush()
return self.surface_buffer.read()
def _render_layer(self, layer, theme=THEMES['default']):
settings = theme.get(layer.layer_class, RenderSettings())
self.color = settings.color
self.alpha = settings.alpha
self.invert = settings.invert
# Get a new clean layer to render on
self._new_render_layer(mirror=settings.mirror)
for prim in layer.primitives:
self.render(prim)
# Add layer to image
self._flatten()
def _render_line(self, line, color):
start = [pos * scale for pos, scale in zip(line.start, self.scale)]
end = [pos * scale for pos, scale in zip(line.end, self.scale)]
if not self.invert:
self.ctx.set_source_rgba(*color, alpha=self.alpha)
self.ctx.set_operator(cairo.OPERATOR_OVER
if line.level_polarity == 'dark'
else cairo.OPERATOR_CLEAR)
else:
self.ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)
self.ctx.set_operator(cairo.OPERATOR_CLEAR)
if isinstance(line.aperture, Circle):
width = line.aperture.diameter
self.ctx.set_line_width(width * self.scale[0])
self.ctx.set_line_cap(cairo.LINE_CAP_ROUND)
self.ctx.move_to(*start)
self.ctx.line_to(*end)
self.ctx.stroke()
elif isinstance(line.aperture, Rectangle):
points = [self.scale_point(x) for x in line.vertices]
self.ctx.set_line_width(0)
self.ctx.move_to(*points[0])
for point in points[1:]:
self.ctx.line_to(*point)
self.ctx.fill()
def _render_arc(self, arc, color):
center = self.scale_point(arc.center)
start = self.scale_point(arc.start)
end = self.scale_point(arc.end)
radius = self.scale[0] * arc.radius
angle1 = arc.start_angle
angle2 = arc.end_angle
width = arc.aperture.diameter if arc.aperture.diameter != 0 else 0.001
if not self.invert:
self.ctx.set_source_rgba(*color, alpha=self.alpha)
self.ctx.set_operator(cairo.OPERATOR_OVER
if arc.level_polarity == 'dark'
else cairo.OPERATOR_CLEAR)
else:
self.ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)
self.ctx.set_operator(cairo.OPERATOR_CLEAR)
self.ctx.set_line_width(width * self.scale[0])
self.ctx.set_line_cap(cairo.LINE_CAP_ROUND)
self.ctx.move_to(*start) # You actually have to do this...
if arc.direction == 'counterclockwise':
self.ctx.arc(*center, radius=radius, angle1=angle1, angle2=angle2)
else:
self.ctx.arc_negative(*center, radius=radius,
angle1=angle1, angle2=angle2)
self.ctx.move_to(*end) # ...lame
def _render_region(self, region, color):
if not self.invert:
self.ctx.set_source_rgba(*color, alpha=self.alpha)
self.ctx.set_operator(cairo.OPERATOR_OVER
if region.level_polarity == 'dark'
else cairo.OPERATOR_CLEAR)
else:
self.ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)
self.ctx.set_operator(cairo.OPERATOR_CLEAR)
self.ctx.set_line_width(0)
self.ctx.set_line_cap(cairo.LINE_CAP_ROUND)
self.ctx.move_to(*self.scale_point(region.primitives[0].start))
for prim in region.primitives:
if isinstance(prim, Line):
self.ctx.line_to(*self.scale_point(prim.end))
else:
center = self.scale_point(prim.center)
radius = self.scale[0] * prim.radius
angle1 = prim.start_angle
angle2 = prim.end_angle
if prim.direction == 'counterclockwise':
self.ctx.arc(*center, radius=radius,
angle1=angle1, angle2=angle2)
else:
self.ctx.arc_negative(*center, radius=radius,
angle1=angle1, angle2=angle2)
self.ctx.fill()
def _render_circle(self, circle, color):
center = self.scale_point(circle.position)
if not self.invert:
self.ctx.set_source_rgba(*color, alpha=self.alpha)
self.ctx.set_operator(
cairo.OPERATOR_OVER if circle.level_polarity == 'dark' else cairo.OPERATOR_CLEAR)
else:
self.ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)
self.ctx.set_operator(cairo.OPERATOR_CLEAR)
self.ctx.set_line_width(0)
self.ctx.arc(*center, radius=circle.radius *
self.scale[0], angle1=0, angle2=2 * math.pi)
self.ctx.fill()
def _render_rectangle(self, rectangle, color):
lower_left = self.scale_point(rectangle.lower_left)
width, height = tuple([abs(coord) for coord in self.scale_point((rectangle.width, rectangle.height))])
if not self.invert:
self.ctx.set_source_rgba(*color, alpha=self.alpha)
self.ctx.set_operator(
cairo.OPERATOR_OVER if rectangle.level_polarity == 'dark' else cairo.OPERATOR_CLEAR)
else:
self.ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)
self.ctx.set_operator(cairo.OPERATOR_CLEAR)
self.ctx.set_line_width(0)
self.ctx.rectangle(*lower_left, width=width, height=height)
self.ctx.fill()
def _render_obround(self, obround, color):
self._render_circle(obround.subshapes['circle1'], color)
self._render_circle(obround.subshapes['circle2'], color)
self._render_rectangle(obround.subshapes['rectangle'], color)
def _render_drill(self, circle, color=None):
color = color if color is not None else self.drill_color
self._render_circle(circle, color)
def _render_test_record(self, primitive, color):
position = [pos + origin for pos, origin in zip(primitive.position, self.origin_in_inch)]
self.ctx.set_operator(cairo.OPERATOR_OVER)
self.ctx.select_font_face(
'monospace', cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_BOLD)
self.ctx.set_font_size(13)
self._render_circle(Circle(position, 0.015), color)
self.ctx.set_source_rgba(*color, alpha=self.alpha)
self.ctx.set_operator(
cairo.OPERATOR_OVER if primitive.level_polarity == 'dark' else cairo.OPERATOR_CLEAR)
self.ctx.move_to(*[self.scale[0] * (coord + 0.015)
for coord in position])
self.ctx.scale(1, -1)
self.ctx.show_text(primitive.net_name)
self.ctx.scale(1, -1)
def _new_render_layer(self, color=None, mirror=False):
size_in_pixels = self.scale_point(self.size_in_inch)
layer = cairo.SVGSurface(None, size_in_pixels[0], size_in_pixels[1])
ctx = cairo.Context(layer)
ctx.set_fill_rule(cairo.FILL_RULE_EVEN_ODD)
ctx.scale(1, -1)
ctx.translate(-(self.origin_in_inch[0] * self.scale[0]),
(-self.origin_in_inch[1] * self.scale[0]) - size_in_pixels[1])
if self.invert:
ctx.set_operator(cairo.OPERATOR_OVER)
ctx.set_source_rgba(*self.color, alpha=self.alpha)
ctx.paint()
matrix = copy.copy(self._xform_matrix)
if mirror:
matrix.xx = -1.0
matrix.x0 = self.origin_in_pixels[0] + self.size_in_pixels[0]
self.ctx = ctx
self.active_layer = layer
self.active_matrix = matrix
def _flatten(self):
self.output_ctx.set_operator(cairo.OPERATOR_OVER)
ptn = cairo.SurfacePattern(self.active_layer)
ptn.set_matrix(self.active_matrix)
self.output_ctx.set_source(ptn)
self.output_ctx.paint()
self.ctx = None
self.active_layer = None
self.active_matrix = None
def _paint_background(self, force=False):
if (not self.bg) or force:
self.bg = True
self.output_ctx.set_operator(cairo.OPERATOR_OVER)
self.output_ctx.set_source_rgba(*self.background_color, alpha=1.0)
self.output_ctx.paint()
def scale_point(self, point):
return tuple([coord * scale for coord, scale in zip(point, self.scale)])
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