SO CLOSE TO PERFECTION

py/hexagram/app.pyx

@@ -12,8 +12,6 @@ from hexagram.window cimport *
 
 from hexagram.cluster import Cluster
 
-CLUSTER_WIDTH       = 1280
-CLUSTER_HEIGHT      =  480
 CLUSTER_RPM_MIN     = 1200
 CLUSTER_RPM_REDLINE = 6500
 CLUSTER_RPM_MAX     = 8000
@@ -37,6 +35,14 @@ cdef handle_xevents(hexagram_window *window,
             cluster.draw_fg(fg)
             hexagram_window_swap_buffer(window)
 
+cdef cluster_update(cluster: Cluster,
+                    fg: cairo.Context,
+                    hexagram_window *window,
+                    can_frame *frame):
+    hexagram_window_refresh_bg(window)
+    cluster.draw_fg(fg)
+    hexagram_window_swap_buffer(window)
+
 def main():
     cdef fd_set rfds, rready
     cdef can_frame frame
@@ -51,7 +57,7 @@ def main():
     if can_if is NULL:
         raise Exception("hexagram_can_if_open()")
 
-    window = hexagram_window_new_x11(NULL, CLUSTER_WIDTH, CLUSTER_HEIGHT)
+    window = hexagram_window_new_x11(NULL, Cluster.WIDTH, Cluster.HEIGHT)
 
     if window is NULL:
         raise Exception("hexagram_window_new_x11()")
@@ -99,6 +105,8 @@ def main():
         if FD_ISSET(fd, &rready):
             hexagram_can_if_read(can_if, &frame)
 
+            cluster_update(cluster, <object>fg, window, &frame)
+
     hexagram_window_destroy(window)
 
     return 0

py/hexagram/can.pxd

@@ -1,10 +1,17 @@
+from libc.stdint cimport uint8_t, uint32_t
+
 cdef extern from "sys/select.h":
     ctypedef struct fd_set:
         pass
 
 cdef extern from "linux/can.h":
-    cdef struct can_frame:
-        pass
+    cdef packed struct can_frame:
+        uint32_t can_id
+        uint8_t len
+        uint8_t __pad
+        uint8_t __res0
+        uint8_t __len8_dlc
+        uint8_t data[8]
 
 cdef extern from "hexagram/can.h":
     ctypedef struct hexagram_can_if: