Layers are now arranged as a tree data structure.

1 files changed, 9 insertions, 4 deletions

diff --git a/ka_incoming.py b/ka_incoming.py
index 10aacff..6e22b74 100644
--- a/ka_incoming.py
+++ b/ka_incoming.py
@@ -33,7 +33,7 @@ class KandidIncoming(object):
         """
         ka_debug.info('Append protozoon')
         while len(self.incoming_protozoans) >= self.capacity:
-            self.incoming_protozoans[0:1] = []
+            del self.incoming_protozoans[0]
         self.incoming_protozoans.append(incoming_protozoon)
 
     def accept_protozoon(self, model, index):
@@ -44,7 +44,7 @@ class KandidIncoming(object):
         if index < len(self.incoming_protozoans):
             ka_debug.info('accept incoming protozoon %u' % index)
             new_at = model.replace(self.incoming_protozoans[index])
-            self.incoming_protozoans[index:1] = []
+            del self.incoming_protozoans[index]
         return new_at
 
     def decline_protozoon(self, index):
@@ -53,10 +53,10 @@ class KandidIncoming(object):
         """
         if index < len(self.incoming_protozoans):
             ka_debug.info('decline incoming protozoon %u' % index)
-            self.incoming_protozoans[index:1] = []
+            del self.incoming_protozoans[index]
 
     def draw(self, index, ctx, width, height):
-        """ Repaint all protozoon images inside incoming area.
+        """ Repaint one protozoon image inside incoming area.
         pre: 0 <= index < self.capacity
         pre: ctx is not None
         pre: width > 0
@@ -65,4 +65,9 @@ class KandidIncoming(object):
         if index < len(self.incoming_protozoans):
             # draw protozoon 
             self.incoming_protozoans[index].render(ctx, width, height)
+        else:
+            ctx.set_source_rgba(0.65, 0.65, 0.65, 0.0)
+            ctx.rectangle(0.0, 0.0, width, height)
+            ctx.fill()
+