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-rw-r--r--gerber/render/cairo_backend.py6
-rw-r--r--gerber/rs274x.py11
-rw-r--r--gerber/tests/test_cairo_backend.py40
3 files changed, 49 insertions, 8 deletions
diff --git a/gerber/render/cairo_backend.py b/gerber/render/cairo_backend.py
index 3d87f5c..0a5e550 100644
--- a/gerber/render/cairo_backend.py
+++ b/gerber/render/cairo_backend.py
@@ -142,7 +142,7 @@ class GerberCairoContext(GerberContext):
if is_svg:
self.surface.finish()
self.surface_buffer.flush()
- with open(filename, "w") as f:
+ with open(filename, "wb") as f:
self.surface_buffer.seek(0)
f.write(self.surface_buffer.read())
f.flush()
@@ -568,7 +568,7 @@ class GerberCairoContext(GerberContext):
def _flatten(self, color=None, alpha=None):
color = color if color is not None else self.color
alpha = alpha if alpha is not None else self.alpha
- self.output_ctx.set_source_rgba(*color, alpha=alpha)
+ self.output_ctx.set_source_rgba(color[0], color[1], color[2], alpha)
self.output_ctx.mask_surface(self.active_layer)
self.ctx = None
self.active_layer = None
@@ -579,7 +579,7 @@ class GerberCairoContext(GerberContext):
alpha = settings.alpha if settings is not None else 1.0
if not self.has_bg:
self.has_bg = True
- self.output_ctx.set_source_rgba(*color, alpha=alpha)
+ self.output_ctx.set_source_rgba(color[0], color[1], color[2], alpha)
self.output_ctx.paint()
def _clip_primitive(self, primitive):
diff --git a/gerber/rs274x.py b/gerber/rs274x.py
index 5191fb7..fee60b3 100644
--- a/gerber/rs274x.py
+++ b/gerber/rs274x.py
@@ -765,14 +765,17 @@ class GerberParser(object):
# Calculate the radius error
sqdist_start = sq_distance(start, test_center)
sqdist_end = sq_distance(end, test_center)
+ sqdist_diff = abs(sqdist_start - sqdist_end)
# Take the option with the lowest radius error from the set of
# options with a valid sweep angle
- if ((abs(sqdist_start - sqdist_end) < sqdist_diff_min)
- and (sweep_angle >= 0)
- and (sweep_angle <= math.pi / 2.0)):
+ # In some rare cases, the sweep angle is numerically (10**-14) above pi/2
+ # So it is safer to compare the angles with some tolerance
+ is_lowest_radius_error = sqdist_diff < sqdist_diff_min
+ is_valid_sweep_angle = sweep_angle >= 0 and sweep_angle <= math.pi / 2.0 + 1e-6
+ if is_lowest_radius_error and is_valid_sweep_angle:
center = test_center
- sqdist_diff_min = abs(sqdist_start - sqdist_end)
+ sqdist_diff_min = sqdist_diff
return center
else:
return (start[0] + offsets[0], start[1] + offsets[1])
diff --git a/gerber/tests/test_cairo_backend.py b/gerber/tests/test_cairo_backend.py
index 9195b93..d5ce4ed 100644
--- a/gerber/tests/test_cairo_backend.py
+++ b/gerber/tests/test_cairo_backend.py
@@ -3,7 +3,8 @@
# Author: Garret Fick <garret@ficksworkshop.com>
import os
-
+import shutil
+import tempfile
from ..render.cairo_backend import GerberCairoContext
from ..rs274x import read
@@ -136,6 +137,11 @@ def _DISABLED_test_render_am_exposure_modifier():
_test_render('resources/example_am_exposure_modifier.gbr', 'golden/example_am_exposure_modifier.png')
+def test_render_svg_simple_contour():
+ """Example of rendering to an SVG file"""
+ _test_simple_render_svg('resources/example_simple_contour.gbr')
+
+
def _resolve_path(path):
return os.path.join(os.path.dirname(__file__),
path)
@@ -187,3 +193,35 @@ def _test_render(gerber_path, png_expected_path, create_output_path = None):
assert_true(equal)
return gerber
+
+
+def _test_simple_render_svg(gerber_path):
+ """Render the gerber file as SVG
+
+ Note: verifies only the header, not the full content.
+
+ Parameters
+ ----------
+ gerber_path : string
+ Path to Gerber file to open
+ """
+
+ gerber_path = _resolve_path(gerber_path)
+ gerber = read(gerber_path)
+
+ # Create SVG image to the memory stream
+ ctx = GerberCairoContext()
+ gerber.render(ctx)
+
+ temp_dir = tempfile.mkdtemp()
+ svg_temp_path = os.path.join(temp_dir, 'output.svg')
+
+ assert_false(os.path.exists(svg_temp_path))
+ ctx.dump(svg_temp_path)
+ assert_true(os.path.exists(svg_temp_path))
+
+ with open(svg_temp_path, 'r') as expected_file:
+ expected_bytes = expected_file.read()
+ assert_equal(expected_bytes[:38], '<?xml version="1.0" encoding="UTF-8"?>')
+
+ shutil.rmtree(temp_dir)