Separate things into functions a bit

interactions.py

@@ -44,7 +44,11 @@ cyc_edge_adj = [
 # === interaction parameters ===
 
 frame_rate = 24
+
 inductance = 0.001
+
+therm_conduct = 0.001
+
 drain = False
 drain_rate = 0.1
 
@@ -55,6 +59,39 @@ current = 30*[0]
 
 # === main loop ===
 
+def heat_evolution():
+  for e, f in cyc_edge_adj:
+    flow = therm_conduct*(current[e] - current[f])
+    current[e] -= flow
+    current[f] += flow
+    if drain:
+      current[v] *= 1 - drain_rate
+
+def wave_evolution():
+  # use verlet integration, first updating the currents and then using the new
+  # currents to update the charges.
+  for e in range(30):
+    u, v = edges[e]
+    current[e] += inductance*(charge[u] - charge[v])
+  for e in range(30):
+    u, v = edges[e]
+    charge[u] -= current[e]
+    charge[v] += current[e]
+  if drain:
+    for v in range(12):
+      charge[v] *= 1 - drain_rate
+
+def show_data(screen):
+  energy = 0.5*(sum(q*q for q in charge) + inductance*sum(i*i for i in current))
+  text = font.render('energy', True, (255, 255, 255))
+  screen.blit(text, (20, viewsize))
+  text = font.render(str(energy), True, (255, 255, 255))
+  screen.blit(text, (120, viewsize))
+  text = font.render('charge[0]', True, (255, 255, 255))
+  screen.blit(text, (20, 30 + viewsize))
+  text = font.render(str(charge[0]), True, (255, 255, 255))
+  screen.blit(text, (120, 30 + viewsize))
+
 if __name__ == '__main__':
   # set up display and clock
   pygame.init()
@@ -73,11 +110,11 @@ if __name__ == '__main__':
     for event in pygame.event.get():
       if event.type == pygame.KEYDOWN:
         if event.key == pygame.K_j:
-          charge[0] += 10
-          charge[11] -= 10
-        elif event.key == pygame.K_k:
           charge[0] += 100
           charge[11] -= 100
+        elif event.key == pygame.K_k:
+          charge[5] += 100
+          charge[7] -= 100
         elif event.key == pygame.K_SPACE:
           drain = True
         pygame.draw.aaline(screen, (255, 255, 255), (0, 0), (viewsize, viewsize))
@@ -87,17 +124,11 @@ if __name__ == '__main__':
       elif event.type == pygame.QUIT:
         quit()
     
-    # print data
-    energy = 0.5*(sum(q*q for q in charge) + inductance*sum(i*i for i in current))
+    # clear screen
     screen.blit(background, (0, 0))
-    text = font.render('energy', True, (255, 255, 255))
-    screen.blit(text, (20, viewsize))
-    text = font.render(str(energy), True, (255, 255, 255))
-    screen.blit(text, (120, viewsize))
-    text = font.render('charge[0]', True, (255, 255, 255))
-    screen.blit(text, (20, 30 + viewsize))
-    text = font.render(str(charge[0]), True, (255, 255, 255))
-    screen.blit(text, (120, 30 + viewsize))
+    
+    # show data
+    show_data(screen)
     
     # show state
     for e in range(30):
@@ -111,19 +142,9 @@ if __name__ == '__main__':
         vertices[edges[e][1]],
       )
     
-    # evolve state. use verlet integration, first updating the currents and then
-    # using the new currents to update the charges.
-    for e in range(30):
-      u, v = edges[e]
-      ##current[e] *= 1 - resistance
-      current[e] += inductance*(charge[u] - charge[v])
-    for e in range(30):
-      u, v = edges[e]
-      charge[u] -= current[e]
-      charge[v] += current[e]
-    if drain:
-      for v in range(12):
-        charge[v] *= 1 - drain_rate
+    # evolve state
+    wave_evolution()
+    ##heat_evolution()
     
     # step
     pygame.display.flip()