1 files changed, 76 insertions, 0 deletions
diff --git a/gerber/render/excellon_backend.py b/gerber/render/excellon_backend.py
new file mode 100644
index 0000000..bec8367
--- /dev/null
+++ b/gerber/render/excellon_backend.py
@@ -0,0 +1,76 @@
+
+from .render import GerberContext
+from ..excellon_statements import *
+
+class ExcellonContext(GerberContext):
+    
+    def __init__(self, settings):
+        GerberContext.__init__(self)
+        self.comments = []
+        self.header = []
+        self.tool_def = []
+        self.body = []
+        self.end = [EndOfProgramStmt()]
+        
+        self.handled_tools = set()
+        self.cur_tool = None
+        self.pos = (None, None)
+        
+        self.settings = settings
+
+        self._start_header(settings)
+        
+    def _start_header(self, settings):
+        pass
+        
+    @property
+    def statements(self):
+        return self.comments + self.header + self.body + self.end
+        
+    def set_bounds(self, bounds):
+        pass
+    
+    def _paint_background(self):
+        pass
+        
+    def _render_line(self, line, color):
+        raise ValueError('Invalid Excellon object')
+    def _render_arc(self, arc, color):
+        raise ValueError('Invalid Excellon object')
+
+    def _render_region(self, region, color):
+        raise ValueError('Invalid Excellon object')
+        
+    def _render_level_polarity(self, region):
+        raise ValueError('Invalid Excellon object')
+
+    def _render_circle(self, circle, color):
+        raise ValueError('Invalid Excellon object')
+
+    def _render_rectangle(self, rectangle, color):
+        raise ValueError('Invalid Excellon object')
+        
+    def _render_obround(self, obround, color):
+        raise ValueError('Invalid Excellon object')
+        
+    def _render_polygon(self, polygon, color):
+        raise ValueError('Invalid Excellon object')
+    
+    def _simplify_point(self, point):
+        return (point[0] if point[0] != self._pos[0] else None, point[1] if point[1] != self._pos[1] else None)
+
+    def _render_drill(self, drill, color):
+        
+        if not drill in self.handled_tools:
+            self.tool_def.append(drill.tool)
+    
+        if drill.tool != self.cur_tool:
+            self.body.append(ToolSelectionStmt(drill.tool.number))
+            
+        point = self._simplify_point(drill.position)
+        self._pos = drill.position
+        self.body.append(CoordinateStmt.from_point())
+
+    def _render_inverted_layer(self):
+        pass
+        
+\ No newline at end of file