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import matplotlib.pyplot as plt
from queue import Queue
class VrptwAcoFigure:
def __init__(self, nodes: list, path_queue: Queue):
"""
matplotlib绘图计算需要放在主线程，寻找路径的工作建议另外开一个线程，
当寻找路径的线程找到一个新的path的时候，将path放在path_queue中，图形绘制线程就会自动进行绘制
queue中存放的path以PathMessage（class）的形式存在
nodes中存放的结点以Node（class）的形式存在，主要使用到Node.x, Node.y 来获取到结点的坐标
:param nodes: nodes是各个结点的list，包括depot
:param path_queue: queue用来存放工作线程计算得到的path，队列中的每一个元素都是一个path，path中存放的是各个结点的id
"""
self.nodes = nodes
self.figure = plt.figure(figsize=(10, 10))
self.figure_ax = self.figure.add_subplot(1, 1, 1)
self.path_queue = path_queue
self._dot_color = 'k'
self._line_color_list = ['r', 'y', 'g', 'c', 'b', 'm']
def _draw_point(self):
# 先画出图中的点
self.figure_ax.plot(list(node.x for node in self.nodes),
list(node.y for node in self.nodes), '%s.' % self._dot_color)
self.figure.show()
plt.pause(0.5)
def run(self):
self._draw_point()
# 从队列中读取新的path，进行绘制
while True:
if not self.path_queue.empty():
info = self.path_queue.get()
while not self.path_queue.empty():
info = self.path_queue.get()
path, distance, used_vehicle_num = info.get_path_info()
if path is None:
break
self.figure_ax.clear()
self._draw_point()
self.figure.canvas.draw()
plt.pause(1)
self._draw_line(path)
plt.pause(1)
def _draw_line(self, path):
# 根据path中index进行路劲的绘制
for i in range(1, len(path)):
x_list = [self.nodes[path[i - 1]].x, self.nodes[path[i]].x]
y_list = [self.nodes[path[i - 1]].y, self.nodes[path[i]].y]
self.figure_ax.plot(x_list, y_list, '%s-' % self._line_color_list[0])
plt.pause(0.05)
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