Fix a bunch of rendering bugs.

  - 'clear' polarity primitives no longer erase background
  - Added aperture macro support for polygons
  - Added aperture macro rendring support
  - Renderer now creates a new surface for each layer and merges them instead of working
    directly on a single surface
  - Updated examples accordingly

1 files changed, 5 insertions, 5 deletions

diff --git a/gerber/tests/test_excellon.py b/gerber/tests/test_excellon.py
index a9a33c7..e7c77c6 100644
--- a/gerber/tests/test_excellon.py
+++ b/gerber/tests/test_excellon.py
@@ -13,6 +13,7 @@ from .tests import *
 NCDRILL_FILE = os.path.join(os.path.dirname(__file__),
                             'resources/ncdrill.DRD')
 
+
 def test_format_detection():
     """ Test file type detection
     """
@@ -75,10 +76,11 @@ def test_conversion():
     for statement in ncdrill_inch.statements:
         statement.to_metric()
 
-    for m_tool, i_tool in zip(iter(ncdrill.tools.values()), iter(ncdrill_inch.tools.values())):
+    for m_tool, i_tool in zip(iter(ncdrill.tools.values()),
+                              iter(ncdrill_inch.tools.values())):
         assert_equal(i_tool, m_tool)
 
-    for m, i in zip(ncdrill.primitives,inch_primitives):
+    for m, i in zip(ncdrill.primitives, inch_primitives):
         assert_equal(m, i)
 
 
@@ -187,12 +189,10 @@ def test_parse_incremental_position():
     p = ExcellonParser(FileSettings(notation='incremental'))
     p._parse_line('X01Y01')
     p._parse_line('X01Y01')
-    assert_equal(p.pos, [2.,2.])
+    assert_equal(p.pos, [2., 2.])
 
 
 def test_parse_unknown():
     p = ExcellonParser(FileSettings())
     p._parse_line('Not A Valid Statement')
     assert_equal(p.statements[0].stmt, 'Not A Valid Statement')
-
-