3 files changed, 95 insertions, 4 deletions
diff --git a/gerber/render/__init__.py b/gerber/render/__init__.py
index 0d3527b..b4af4ad 100644
--- a/gerber/render/__init__.py
+++ b/gerber/render/__init__.py
@@ -25,4 +25,4 @@ SVG is the only supported format.
 
 
 from svgwrite_backend import GerberSvgContext
-
+from cairo_backend import GerberCairoContext
diff --git a/gerber/render/cairo_backend.py b/gerber/render/cairo_backend.py
new file mode 100644
index 0000000..df513bb
--- /dev/null
+++ b/gerber/render/cairo_backend.py
@@ -0,0 +1,91 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright 2014 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.
+
+from .render import GerberContext
+from operator import mul
+import cairocffi as cairo
+import math
+
+SCALE = 300.
+
+
+class GerberCairoContext(GerberContext):
+    def __init__(self, surface=None, size=(1000, 1000)):
+        GerberContext.__init__(self)
+        if surface is None:
+            self.surface = cairo.ImageSurface(cairo.FORMAT_ARGB32,
+                                              size[0], size[1])
+        else:
+            self.surface = surface
+        self.ctx = cairo.Context(self.surface)
+        self.size = size
+        self.ctx.translate(0, self.size[1])
+        self.scale = (SCALE,SCALE)
+        self.ctx.scale(1, -1)
+        self.apertures = {}
+        self.background = False
+
+    def set_bounds(self, bounds):
+        xbounds, ybounds = bounds
+        self.ctx.rectangle(SCALE * xbounds[0], SCALE * ybounds[0], SCALE * (xbounds[1]- xbounds[0]), SCALE * (ybounds[1] - ybounds[0]))
+        self.ctx.set_source_rgb(0,0,0)
+        self.ctx.fill()
+
+    def _render_line(self, line, color):
+        start = map(mul, line.start, self.scale)
+        end = map(mul, line.end, self.scale)
+        self.ctx.set_source_rgb (*color)
+        self.ctx.set_line_width(line.width * SCALE)
+        self.ctx.set_line_cap(cairo.LINE_CAP_ROUND)
+        self.ctx.move_to(*start)
+        self.ctx.line_to(*end)
+        self.ctx.stroke()
+
+    def _render_region(self, region, color):
+        points = [tuple(map(mul, point, self.scale)) for point in region.points]
+        self.ctx.set_source_rgb (*color)
+        self.ctx.set_line_width(0)
+        self.ctx.move_to(*points[0])
+        for point in points[1:]:
+            self.ctx.move_to(*point)
+        self.ctx.fill()
+
+    def _render_circle(self, circle, color):
+        center = map(mul, circle.position, self.scale)
+        self.ctx.set_source_rgb (*color)
+        self.ctx.set_line_width(0)
+        self.ctx.arc(*center, radius=circle.radius * SCALE, angle1=0, angle2=2 * math.pi)
+        self.ctx.fill()
+
+    def _render_rectangle(self, rectangle, color):
+        ll = map(mul, rectangle.lower_left, self.scale)
+        width, height = tuple(map(mul, (rectangle.width, rectangle.height), map(abs, self.scale)))
+        self.ctx.set_source_rgb (*color)
+        self.ctx.set_line_width(0)
+        self.ctx.rectangle(*ll,width=width, height=height)
+        self.ctx.fill()
+
+    def _render_obround(self, obround, color):
+        self._render_circle(obround.subshapes['circle1'], color)
+        self._render_circle(obround.subshapes['circle2'], color)
+        self._render_rectangle(obround.subshapes['rectangle'], color)
+
+    def _render_drill(self, circle, color):
+        self._render_circle(circle, color)
+
+    def dump(self, filename):
+        self.surface.write_to_png(filename)
diff --git a/gerber/render/svgwrite_backend.py b/gerber/render/svgwrite_backend.py
index d9456a5..2df87b3 100644
--- a/gerber/render/svgwrite_backend.py
+++ b/gerber/render/svgwrite_backend.py
@@ -148,8 +148,8 @@ class GerberSvgContext(GerberContext):
             self.dwg.add(c2)
             self.dwg.add(rect)
 
-    def _render_drill(self, primitive, color):
-        center = map(mul, primitive.position, self.scale)
-        hit = self.dwg.circle(center=center, r=SCALE * primitive.radius,
+    def _render_drill(self, circle, color):
+        center = map(mul, circle.position, self.scale)
+        hit = self.dwg.circle(center=center, r=SCALE * circle.radius,
                               fill=svg_color(color))
         self.dwg.add(hit)