From ccb6eb7a766bd6edf314978f3ec4fc0dcd61652d Mon Sep 17 00:00:00 2001
From: Garret Fick <garret@ficksworkshop.com>
Date: Sat, 25 Jun 2016 16:46:44 +0800
Subject: Add support for polygon apertures

---
 gerber/render/cairo_backend.py  | 15 +++++++++++++++
 gerber/render/rs274x_backend.py | 26 ++++++++++++++++++++++----
 2 files changed, 37 insertions(+), 4 deletions(-)

(limited to 'gerber/render')

diff --git a/gerber/render/cairo_backend.py b/gerber/render/cairo_backend.py
index c1bd60c..2b7c2ff 100644
--- a/gerber/render/cairo_backend.py
+++ b/gerber/render/cairo_backend.py
@@ -159,6 +159,9 @@ class GerberCairoContext(GerberContext):
         self._render_rectangle(obround.subshapes['rectangle'], color)
         
     def _render_polygon(self, polygon, color):
+        if polygon.hole_radius > 0:
+            self.ctx.push_group()
+        
         vertices = polygon.vertices 
         
         self.ctx.set_source_rgba(color[0], color[1], color[2], self.alpha)
@@ -172,6 +175,18 @@ class GerberCairoContext(GerberContext):
             self.ctx.line_to(*map(mul, v, self.scale))
 
         self.ctx.fill()
+        
+        if polygon.hole_radius > 0:
+            # Render the center clear
+            center = tuple(map(mul, polygon.position, self.scale))
+            self.ctx.set_source_rgba(color[0], color[1], color[2], self.alpha)
+            self.ctx.set_operator(cairo.OPERATOR_CLEAR)        
+            self.ctx.set_line_width(0)
+            self.ctx.arc(center[0], center[1], polygon.hole_radius * self.scale[0], 0, 2 * math.pi)
+            self.ctx.fill()
+            
+            self.ctx.pop_group_to_source()
+            self.ctx.paint_with_alpha(1)
 
     def _render_drill(self, circle, color):
         self._render_circle(circle, color)
diff --git a/gerber/render/rs274x_backend.py b/gerber/render/rs274x_backend.py
index bb784b1..c37529e 100644
--- a/gerber/render/rs274x_backend.py
+++ b/gerber/render/rs274x_backend.py
@@ -310,7 +310,7 @@ class Rs274xContext(GerberContext):
                 self._next_dcode = max(dcode + 1, self._next_dcode)
             
             aper = ADParamStmt.obround(dcode, width, height)
-            self._obrounds[(width, height)] = aper
+            self._obrounds[key] = aper
             self.header.append(aper)
     
         return aper
@@ -320,10 +320,28 @@ class Rs274xContext(GerberContext):
         aper = self._get_obround(obround.width, obround.height)
         self._render_flash(obround, aper)
         
-        pass
-        
     def _render_polygon(self, polygon, color):
-        raise ValueError('Polygons can only exist in the context of aperture macro')
+        
+        aper = self._get_polygon(polygon.radius, polygon.sides, polygon.rotation, polygon.hole_radius)
+        self._render_flash(polygon, aper)
+        
+    def _get_polygon(self, radius, num_vertices, rotation, hole_radius, dcode = None):
+        
+        key = (radius, num_vertices, rotation, hole_radius)
+        aper = self._polygons.get(key, None)
+        
+        if not aper:
+            if not dcode:
+                dcode = self._next_dcode
+                self._next_dcode += 1
+            else:
+                self._next_dcode = max(dcode + 1, self._next_dcode)
+                
+            aper = ADParamStmt.polygon(dcode, radius * 2, num_vertices, rotation, hole_radius * 2)
+            self._polygons[key] = aper
+            self.header.append(aper)
+            
+        return aper
         
     def _render_drill(self, drill, color):
         raise ValueError('Drills are not valid in RS274X files')
-- 
cgit