ft (wip): tracking across boundaries

evolve-die-repeat/game_manager.gd

@@ -60,10 +60,10 @@ func init_screen_size(x:float, y:float) -> void:
 
 # This can take a vector of any size (but should be 2d, other components are unused)
 func get_boundaried_position(position):
-	## clamp
+	# clamp
 	#return position.clamp(Vector2.ZERO, screen_size)
 	
-	## periodic
+	# periodic
 	position.x = wrapf(position.x, 0, screen_size.x)
 	position.y = wrapf(position.y, 0, screen_size.y)
 	return position
@@ -76,3 +76,39 @@ func get_new_flow():
 	flow_y = flow_mag * sin(flow_dir)
 	
 	
+
+func calc_distance(one, two) -> float:
+	var candidate = one.distance_to(two)
+	var onedup = one
+	# FIXME: doesnt work-- predators lose track across game boundary
+	if one.x < screen_size.x/2:
+		if one.y < screen_size.y/2:
+			# top left
+			onedup.y -= screen_size.y
+			candidate = min(candidate, onedup.distance_to(two))	
+			onedup.y += screen_size.y
+			onedup.x -= screen_size.x
+			candidate = min(candidate, onedup.distance_to(two))	
+		else:
+			# bottom left
+			onedup.y += screen_size.y
+			candidate = min(candidate, onedup.distance_to(two))	
+			onedup.y -= screen_size.y
+			onedup.x -= screen_size.x
+			candidate = min(candidate, onedup.distance_to(two))	
+	else:
+		if one.y < screen_size.y/2:
+			# top  right
+			onedup.y -= screen_size.y
+			candidate = min(candidate, onedup.distance_to(two))	
+			onedup.y += screen_size.y
+			onedup.x += screen_size.x
+			candidate = min(candidate, onedup.distance_to(two))	
+		else:
+			# botom right
+			onedup.y += screen_size.y
+			candidate = min(candidate, onedup.distance_to(two))	
+			onedup.y -= screen_size.y
+			onedup.x += screen_size.x
+			candidate = min(candidate, onedup.distance_to(two))	
+	return candidate