Add support for polygon apertures

1 files changed, 15 insertions, 0 deletions

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)