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, 0 deletions

diff --git a/gerber/operations.py b/gerber/operations.py
index 4eb10e5..d06876e 100644
--- a/gerber/operations.py
+++ b/gerber/operations.py
@@ -22,6 +22,7 @@ CAM File Operations
 """
 import copy
 
+
 def to_inch(cam_file):
     """ Convert Gerber or Excellon file units to imperial
 
@@ -39,6 +40,7 @@ def to_inch(cam_file):
     cam_file.to_inch()
     return cam_file
 
+
 def to_metric(cam_file):
     """ Convert Gerber or Excellon file units to metric
 
@@ -56,6 +58,7 @@ def to_metric(cam_file):
     cam_file.to_metric()
     return cam_file
 
+
 def offset(cam_file, x_offset, y_offset):
     """ Offset a Cam file by a specified amount in the X and Y directions.
 
@@ -79,6 +82,7 @@ def offset(cam_file, x_offset, y_offset):
     cam_file.offset(x_offset, y_offset)
     return cam_file
 
+
 def scale(cam_file, x_scale, y_scale):
     """ Scale a Cam file by a specified amount in the X and Y directions.
 
@@ -101,6 +105,7 @@ def scale(cam_file, x_scale, y_scale):
     # TODO
     pass
 
+
 def rotate(cam_file, angle):
     """ Rotate a Cam file a specified amount about the origin.