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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
from operator import mul
import math
import tempfile
from .render import GerberContext
from ..primitives import *
try:
from cStringIO import StringIO
except(ImportError):
from io import StringIO
class GerberCairoContext(GerberContext):
def __init__(self, scale=300):
GerberContext.__init__(self)
self.scale = (scale, scale)
self.surface = None
self.ctx = None
self.bg = False
self.mask = None
self.mask_ctx = None
self.origin_in_pixels = None
self.size_in_pixels = None
def set_bounds(self, bounds):
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 = map(mul, size_in_inch, self.scale)
self.origin_in_pixels = tuple(map(mul, origin_in_inch, self.scale)) if self.origin_in_pixels is None else self.origin_in_pixels
self.size_in_pixels = size_in_pixels if self.size_in_pixels is None else self.size_in_pixels
if self.surface is None:
self.surface_buffer = tempfile.NamedTemporaryFile()
self.surface = cairo.SVGSurface(self.surface_buffer, size_in_pixels[0], size_in_pixels[1])
self.ctx = cairo.Context(self.surface)
self.ctx.set_fill_rule(cairo.FILL_RULE_EVEN_ODD)
self.ctx.scale(1, -1)
self.ctx.translate(-(origin_in_inch[0] * self.scale[0]), (-origin_in_inch[1]*self.scale[0]) - size_in_pixels[1])
self.mask = cairo.SVGSurface(None, size_in_pixels[0], size_in_pixels[1])
self.mask_ctx = cairo.Context(self.mask)
self.mask_ctx.set_fill_rule(cairo.FILL_RULE_EVEN_ODD)
self.mask_ctx.scale(1, -1)
self.mask_ctx.translate(-(origin_in_inch[0] * self.scale[0]), (-origin_in_inch[1]*self.scale[0]) - size_in_pixels[1])
def _render_line(self, line, color):
start = map(mul, line.start, self.scale)
end = map(mul, line.end, self.scale)
if not self.invert:
ctx = self.ctx
ctx.set_source_rgba(*color, alpha=self.alpha)
ctx.set_operator(cairo.OPERATOR_OVER if line.level_polarity == "dark" else cairo.OPERATOR_CLEAR)
else:
ctx = self.mask_ctx
ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)
ctx.set_operator(cairo.OPERATOR_CLEAR)
if isinstance(line.aperture, Circle):
width = line.aperture.diameter
ctx.set_line_width(width * self.scale[0])
ctx.set_line_cap(cairo.LINE_CAP_ROUND)
ctx.move_to(*start)
ctx.line_to(*end)
ctx.stroke()
elif isinstance(line.aperture, Rectangle):
points = [tuple(map(mul, x, self.scale)) for x in line.vertices]
ctx.set_line_width(0)
ctx.move_to(*points[0])
for point in points[1:]:
ctx.line_to(*point)
ctx.fill()
def _render_arc(self, arc, color):
center = map(mul, arc.center, self.scale)
start = map(mul, arc.start, self.scale)
end = map(mul, arc.end, self.scale)
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:
ctx = self.ctx
ctx.set_source_rgba(*color, alpha=self.alpha)
ctx.set_operator(cairo.OPERATOR_OVER if arc.level_polarity == "dark" else cairo.OPERATOR_CLEAR)
else:
ctx = self.mask_ctx
ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)
ctx.set_operator(cairo.OPERATOR_CLEAR)
ctx.set_line_width(width * self.scale[0])
ctx.set_line_cap(cairo.LINE_CAP_ROUND)
ctx.move_to(*start) # You actually have to do this...
if arc.direction == 'counterclockwise':
ctx.arc(*center, radius=radius, angle1=angle1, angle2=angle2)
else:
ctx.arc_negative(*center, radius=radius, angle1=angle1, angle2=angle2)
ctx.move_to(*end) # ...lame
def _render_region(self, region, color):
if not self.invert:
ctx = self.ctx
ctx.set_source_rgba(*color, alpha=self.alpha)
ctx.set_operator(cairo.OPERATOR_OVER if region.level_polarity == "dark" else cairo.OPERATOR_CLEAR)
else:
ctx = self.mask_ctx
ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)
ctx.set_operator(cairo.OPERATOR_CLEAR)
ctx.set_line_width(0)
ctx.set_line_cap(cairo.LINE_CAP_ROUND)
ctx.move_to(*tuple(map(mul, region.primitives[0].start, self.scale)))
for p in region.primitives:
if isinstance(p, Line):
ctx.line_to(*tuple(map(mul, p.end, self.scale)))
else:
center = map(mul, p.center, self.scale)
start = map(mul, p.start, self.scale)
end = map(mul, p.end, self.scale)
radius = self.scale[0] * p.radius
angle1 = p.start_angle
angle2 = p.end_angle
if p.direction == 'counterclockwise':
ctx.arc(*center, radius=radius, angle1=angle1, angle2=angle2)
else:
ctx.arc_negative(*center, radius=radius, angle1=angle1, angle2=angle2)
ctx.fill()
def _render_circle(self, circle, color):
center = tuple(map(mul, circle.position, self.scale))
if not self.invert:
ctx = self.ctx
ctx.set_source_rgba(*color, alpha=self.alpha)
ctx.set_operator(cairo.OPERATOR_OVER if circle.level_polarity == "dark" else cairo.OPERATOR_CLEAR)
else:
ctx = self.mask_ctx
ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)
ctx.set_operator(cairo.OPERATOR_CLEAR)
ctx.set_line_width(0)
ctx.arc(*center, radius=circle.radius * self.scale[0], angle1=0, angle2=2 * math.pi)
ctx.fill()
def _render_rectangle(self, rectangle, color):
ll = map(mul, rectangle.lower_left, self.scale)
width, height = tuple(map(mul, (rectangle.width, rectangle.height), map(abs, self.scale)))
if not self.invert:
ctx = self.ctx
ctx.set_source_rgba(*color, alpha=self.alpha)
ctx.set_operator(cairo.OPERATOR_OVER if rectangle.level_polarity == "dark" else cairo.OPERATOR_CLEAR)
else:
ctx = self.mask_ctx
ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)
ctx.set_operator(cairo.OPERATOR_CLEAR)
ctx.set_line_width(0)
ctx.rectangle(*ll, width=width, height=height)
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):
self._render_circle(circle, color)
def _render_test_record(self, primitive, color):
self.ctx.select_font_face('monospace', cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_NORMAL)
self.ctx.set_font_size(200)
self._render_circle(Circle(primitive.position, 0.01), color)
self.ctx.set_source_rgb(*color)
self.ctx.set_operator(cairo.OPERATOR_OVER if primitive.level_polarity == "dark" else cairo.OPERATOR_CLEAR)
self.ctx.move_to(*[self.scale[0] * (coord + 0.01) for coord in primitive.position])
self.ctx.scale(1, -1)
self.ctx.show_text(primitive.net_name)
self.ctx.scale(1, -1)
def _clear_mask(self):
self.mask_ctx.set_operator(cairo.OPERATOR_OVER)
self.mask_ctx.set_source_rgba(*self.color, alpha=self.alpha)
self.mask_ctx.paint()
def _render_mask(self):
self.ctx.set_operator(cairo.OPERATOR_OVER)
ptn = cairo.SurfacePattern(self.mask)
ptn.set_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]))
self.ctx.set_source(ptn)
self.ctx.paint()
def _paint_background(self):
if not self.bg:
self.bg = True
self.ctx.set_source_rgba(*self.background_color)
self.ctx.paint()
def dump(self, 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()
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