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#! /usr/bin/env python
# -*- coding: utf-8 -*-
# Author: Garret Fick <garret@ficksworkshop.com>
import io
import os
from ..render.cairo_backend import GerberCairoContext
from ..rs274x import read, GerberFile
from .tests import *
TWO_BOXES_FILE = os.path.join(os.path.dirname(__file__),
'resources/example_two_square_boxes.gbr')
TWO_BOXES_EXPECTED = os.path.join(os.path.dirname(__file__),
'golden/example_two_square_boxes.png')
def test_render_polygon():
_test_render(TWO_BOXES_FILE, TWO_BOXES_EXPECTED)
def _test_render(gerber_path, png_expected_path, create_output_path = None):
"""Render the gerber file and compare to the expected PNG output.
Parameters
----------
gerber_path : string
Path to Gerber file to open
png_expected_path : string
Path to the PNG file to compare to
create_output : string|None
If not None, write the generated PNG to the specified path.
This is primarily to help with
"""
gerber = read(gerber_path)
# Create PNG image to the memory stream
ctx = GerberCairoContext()
gerber.render(ctx)
actual_bytes = ctx.dump(None)
# If we want to write the file bytes, do it now. This happens
if create_output_path:
with open(create_output_path, 'wb') as out_file:
out_file.write(actual_bytes)
# Creating the output is dangerous - it could overwrite the expected result.
# So if we are creating the output, we make the test fail on purpose so you
# won't forget to disable this
assert_false(True, 'Test created the output %s. This needs to be disabled to make sure the test behaves correctly' % (create_output_path,))
# Read the expected PNG file
with open(png_expected_path, 'rb') as expected_file:
expected_bytes = expected_file.read()
assert_equal(expected_bytes, actual_bytes)
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