Add PCB interface

this incorporates some of @chintal's layers.py changes
PCB.from_directory() simplifies loading of multiple gerbers
the PCB() class should be pretty helpful going forward...

the context classes could use some cleaning up, although I'd like to wait until the freecad stuff gets merged, that way we can try to refactor the context base to support more use cases

8 files changed, 1916 insertions, 355 deletions

diff --git a/examples/cairo_example.png b/examples/cairo_example.png
index fc4536a..f33cc69 100644
--- a/examples/cairo_example.png
+++ b/examples/cairo_example.png
diff --git a/examples/cairo_example.py b/examples/cairo_example.py
index f2f6723..14a7037 100644
--- a/examples/cairo_example.py
+++ b/examples/cairo_example.py
@@ -36,7 +36,6 @@ mask = read(os.path.join(GERBER_FOLDER, 'soldermask.GTS'))
 silk = read(os.path.join(GERBER_FOLDER, 'silkscreen.GTO'))
 drill = read(os.path.join(GERBER_FOLDER, 'ncdrill.DRD'))
 
-
 # Create a new drawing context
 ctx = GerberCairoContext()
 
diff --git a/examples/gerbers/bottom_copper.GBL b/examples/gerbers/bottom_copper.GBL
new file mode 100644
index 0000000..0d98da3
--- /dev/null
+++ b/examples/gerbers/bottom_copper.GBL
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diff --git a/examples/gerbers/bottom_mask.GBS b/examples/gerbers/bottom_mask.GBS
new file mode 100644
index 0000000..b06654f
--- /dev/null
+++ b/examples/gerbers/bottom_mask.GBS
@@ -0,0 +1,66 @@
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diff --git a/examples/gerbers/shld.drd b/examples/gerbers/shld.drd
deleted file mode 100644
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--- a/examples/gerbers/shld.drd
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diff --git a/examples/pcb_bottom.png b/examples/pcb_bottom.png
new file mode 100644
index 0000000..1e8c369
--- /dev/null
+++ b/examples/pcb_bottom.png
diff --git a/examples/pcb_example.py b/examples/pcb_example.py
new file mode 100644
index 0000000..5341da0
--- /dev/null
+++ b/examples/pcb_example.py
@@ -0,0 +1,39 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright 2015 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.
+
+"""
+This example demonstrates the use of pcb-tools with cairo to render composite
+images using the PCB interface
+"""
+
+import os
+from gerber import PCB
+from gerber.render import GerberCairoContext, theme
+
+GERBER_FOLDER = os.path.abspath(os.path.join(os.path.dirname(__file__), 'gerbers'))
+
+
+# Create a new drawing context
+ctx = GerberCairoContext()
+
+# Create a new PCB
+pcb = PCB.from_directory(GERBER_FOLDER)
+
+pcb.theme = theme.THEMES['OSH Park']
+ctx.render_layers(pcb.top_layers, os.path.join(os.path.dirname(__file__), 'pcb_top.png'))
+ctx.render_layers(pcb.bottom_layers, os.path.join(os.path.dirname(__file__), 'pcb_bottom.png'))
+
diff --git a/examples/pcb_top.png b/examples/pcb_top.png
new file mode 100644
index 0000000..bf1d687
--- /dev/null
+++ b/examples/pcb_top.png