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environment.py
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# -*- coding: utf-8 -*-
"""
This file is used to create the network environment
@author: Jan Straub
"""
# Imports
from math import pi
from grid_components import EDGE
from create_grid import create_grid_nodes, create_grid_edges
from helper import calculate_distance_between_positions
class ENVIRONMENT:
"""_summary_
Class is used to create the environment for the graph and the agents to operate upon
"""
def __init__(self, jsonNodeList,
xMin, xMax, yMin, yMax, viscosity):
"""_summary_
Create environment object
Args:
jsonNodeList (list): Json list of the original nodes
xMin (float): Minimal x value of original nodes
xMax (float): Maximum x value of original nodes
yMin (float): Minimal y value of original nodes
yMax (float): Maximum y value of original nodes
viscosity (float): Viscosity of fluid.
"""
self.environmentNodeList = []
self.environmentTerminalNodeList = []
self.environmentEdgeList = []
self.create_grid_environment(jsonNodeList,
xMin, xMax, yMin, yMax, viscosity)
def create_grid_environment(self, jsonNodeList,
xMin, xMax, yMin, yMax, viscosity):
"""_summary_
Function creates point grid
Args:
jsonNodeList (list): Json list of the original nodes
xMin (float): Minimal x value of original nodes
xMax (float): Maximum x value of original nodes
yMin (float): Minimal y value of original nodes
yMax (float): Maximum y value of original nodes
viscosity (float): Viscosity of fluid.
"""
create_grid_nodes(jsonNodeList,
xMin, xMax, yMin, yMax,
self.environmentNodeList,
self.environmentTerminalNodeList)
create_grid_edges(yMin, yMax, viscosity,
self.environmentNodeList,
self.environmentEdgeList)
self.set_node_and_edge_weight(jsonNodeList)
def set_node_and_edge_weight(self, jsonNodeList):
"""_summary_
Function sets node and edge weights
Args:
jsonNodeList (list): Json list of the original nodes
"""
enviromentEdgeListLength = len(self.environmentEdgeList)
for node in self.environmentNodeList:
nodePosition = node.position
for terminal in jsonNodeList:
node.weight += calculate_distance_between_positions(nodePosition, terminal)
for edge in self.environmentEdgeList:
edge.cost = (edge.start.weight + edge.end.weight) / enviromentEdgeListLength
def remove_edge(self, edge):
"""_summary_
Function removes edge from nodeEdgeList and edgeList,
removes one connections for edge start and end node and removes neighbors
Args:
edge (object): Edge object that is removed
"""
edgeStartNode = edge.start
edgeEndNode = edge.end
edgeStartNode.nodeEdgeList.remove(edge)
edgeEndNode.nodeEdgeList.remove(edge)
edgeStartNode.connections -= 1
edgeEndNode.connections -= 1
edgeStartNode.neighbors.remove(edgeEndNode)
edgeEndNode.neighbors.remove(edgeStartNode)
self.environmentEdgeList.remove(edge)
del edge
def create_steiner_edge(self, startNode, nextNode):
"""_summary_
Function creates steiner edge
Args:
startNode (object): Start node object of the steiner edge
nextNode (object): End node object of the steiner edge
"""
startId = startNode.nodeObjectId
nextId = nextNode.nodeObjectId
edgeId = ""
piFactor = pi ** 4
if startId < nextId:
edgeId = str(startId) + "-" + str(nextId)
else:
edgeId = str(nextId) + "-" + str(startId)
if edgeId not in self.environmentEdgeList:
edge = EDGE(edgeId, nextNode, startNode, piFactor)
# Add new edge
startNode.nodeEdgeList.append(edge)
nextNode.nodeEdgeList.append(edge)
startNode.connections += 1
nextNode.connections += 1
startNode.neighbors.append(nextNode)
nextNode.neighbors.append(startNode)
self.environmentEdgeList.append(edge)
edge.steinerEdge = True