1 files changed, 133 insertions, 0 deletions
diff --git a/gerber/render/render.py b/gerber/render/render.py
new file mode 100644
index 0000000..e15a36f
--- /dev/null
+++ b/gerber/render/render.py
@@ -0,0 +1,133 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# copyright 2014 Hamilton Kibbe <ham@hamiltonkib.be>
+# Modified from code by Paulo Henrique Silva <ph.silva@gmail.com>
+
+# 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 ..statements import (
+    CommentStmt, UnknownStmt, EofStmt, ParamStmt, CoordStmt, ApertureStmt
+)
+
+
+class GerberContext(object):
+    settings = {}
+
+    x = 0
+    y = 0
+
+    aperture = 0
+    interpolation = 'linear'
+
+    image_polarity = 'positive'
+    level_polarity = 'dark'
+
+    def __init__(self):
+        pass 
+
+    def set_format(self, settings):
+        self.settings = settings
+    
+    def set_coord_format(self, zero_suppression, format, notation):
+        self.settings['zero_suppression'] = zero_suppression
+        self.settings['format'] = format
+        self.settings['notation'] = notation
+
+    def set_coord_notation(self, notation):
+        self.settings['notation'] = notation
+
+    def set_coord_unit(self, unit):
+        self.settings['units'] = unit
+
+    def set_image_polarity(self, polarity):
+        self.image_polarity = polarity
+        
+    def set_level_polarity(self, polarity):
+        self.level_polarity =  polarity
+
+    def set_interpolation(self, interpolation):
+        self.interpolation = 'linear' if interpolation in ("G01", "G1") else 'arc'
+
+    def set_aperture(self, d):
+        self.aperture = d
+
+    def resolve(self, x, y):
+        return  x or self.x, y or self.y
+        
+    def define_aperture(self, d, shape, modifiers):
+        pass
+
+    def move(self, x, y, resolve=True):
+        if resolve:
+            self.x, self.y = self.resolve(x, y)
+        else:
+            self.x, self.y = x, y
+
+    def stroke(self, x, y):
+        pass
+
+    def line(self, x, y):
+        pass
+
+    def arc(self, x, y):
+        pass
+
+    def flash(self, x, y):
+        pass
+
+    def drill(self, x, y, diameter):
+        pass
+
+    def evaluate(self, stmt):
+        if isinstance(stmt, (CommentStmt, UnknownStmt, EofStmt)):
+            return
+
+        elif isinstance(stmt, ParamStmt):
+            self._evaluate_param(stmt)
+
+        elif isinstance(stmt, CoordStmt):
+            self._evaluate_coord(stmt)
+
+        elif isinstance(stmt, ApertureStmt):
+            self._evaluate_aperture(stmt)
+
+        else:
+            raise Exception("Invalid statement to evaluate")
+
+    def _evaluate_param(self, stmt):
+        if stmt.param == "FS":
+            self.set_coord_format(stmt.zero_suppression, stmt.format, stmt.notation)
+            self.set_coord_notation(stmt.notation)
+        elif stmt.param == "MO:":
+            self.set_coord_unit(stmt.mode)
+        elif stmt.param == "IP:":
+            self.set_image_polarity(stmt.ip)
+        elif stmt.param == "LP:":
+            self.set_level_polarity(stmt.lp)
+        elif stmt.param == "AD":
+            self.define_aperture(stmt.d, stmt.shape, stmt.modifiers)
+
+    def _evaluate_coord(self, stmt):
+        if stmt.function in ("G01", "G1", "G02", "G2", "G03", "G3"):
+            self.set_interpolation(stmt.function)
+
+        if stmt.op == "D01":
+            self.stroke(stmt.x, stmt.y)
+        elif stmt.op == "D02":
+            self.move(stmt.x, stmt.y)
+        elif stmt.op == "D03":
+            self.flash(stmt.x, stmt.y)
+
+    def _evaluate_aperture(self, stmt):
+        self.set_aperture(stmt.d)