Sick! A repeating pattern!

py/hexagram/cluster.py

@@ -1,10 +1,13 @@
 import math
 import cairo
 
-from typing import Iterable
+from typing import Iterable, List
+
+from hexagram.pattern import HexagonPattern
 
 class Gauge():
-    pass
+    def draw_bg(self, cr: cairo.Context):
+        raise NotImplementedError
 
 class Dial(Gauge):
     __slots = 'x', 'y', 'radius',
@@ -108,7 +111,7 @@ class Cluster():
     __slots__ = 'gauges',
 
     def __init__(self, rpm_redline: float, rpm_max: float):
-        self.gauges = list()
+        self.gauges: List[Gauge] = list()
 
         for x in (self.HEIGHT / 2, self.WIDTH - self.HEIGHT / 2):
             self.gauges.append(Dial(x, self.HEIGHT / 2, self.HEIGHT / 2))
@@ -119,11 +122,19 @@ class Cluster():
                                           rpm_max))
 
     def draw_bg(self, cr: cairo.Context):
-        cr.set_source_rgb(0, 0, 0)
+        surface = cairo.RecordingSurface(cairo.Content.COLOR_ALPHA,
+                                         cairo.Rectangle(0, 0, 100, 88))
+
+        surface_cr = cairo.Context(surface)
+
+        pattern = HexagonPattern()
+        pattern.draw(surface_cr)
+        surface_cr.stroke()
+
+        cr.set_source_surface(surface, 0, 0)
+        cr.get_source().set_extend(cairo.EXTEND_REPEAT)
         cr.rectangle(0, 0, self.WIDTH, self.HEIGHT)
         cr.fill()
 
-
-
         for gauge in self.gauges:
             gauge.draw_bg(cr)