Merge pull request #5 from hamiltonkibbe/cairo_support

Added basic pycairo rendering 

5 files changed, 115 insertions, 4 deletions

diff --git a/gerber/primitives.py b/gerber/primitives.py
index 670b758..b3869e1 100644
--- a/gerber/primitives.py
+++ b/gerber/primitives.py
@@ -171,6 +171,23 @@ class Obround(Primitive):
         max_y = self.upper_right[1]

         return ((min_x, max_x), (min_y, max_y))

 

+    @property

+    def subshapes(self):

+        if self.orientation == 'vertical':

+            circle1 = Circle((self.position[0], self.position[1] +

+                              (self.height-self.width) / 2.), self.width)

+            circle2 = Circle((self.position[0], self.position[1] -

+                              (self.height-self.width) / 2.), self.width)

+            rect = Rectangle(self.position, self.width,

+                            (self.height - self.width))

+        else:

+            circle1 = Circle((self.position[0] - (self.height - self.width) / 2.,

+                              self.position[1]), self.height)

+            circle2 = Circle((self.position[0] - (self.height - self.width) / 2.,

+                              self.position[1]), self.height)

+            rect = Rectangle(self.position, (self.width - self.height),

+                            self.height)

+        return {'circle1': circle1, 'circle2': circle2, 'rectangle': rect}

 

 class Polygon(Primitive):

     """

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)
diff --git a/requirements.txt b/requirements.txt
index 1605e3d..29f0717 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,10 +3,13 @@ Jinja2==2.7.3
 MarkupSafe==0.23
 Pygments==1.6
 Sphinx==1.2.3
+cairocffi==0.6
+cffi==0.8.6
 coverage==3.7.1
 docutils==0.12
 nose==1.3.4
 numpydoc==0.5
+pycparser==2.10
 pyparsing==2.0.2
 svgwrite==1.1.6
 wsgiref==0.1.2