如何解决更新嵌入在 PyQt5 Matplotlib 中的 Networkx 图
我创建了一个 GUI,用户可以在其中使用按钮打开选项卡。当他这样做时,它会添加以下选项卡:
class data_tab(QtWidgets.QWidget,data_tab_lib.Ui_data_tab):
#=========================================================================================
# Constructor
#=========================================================================================
def __init__(self,parent,title):
QtWidgets.QWidget.__init__(self,parent)
self.setupUi(self)
# initialize save data button icon
icon = _createIcon("dataname_save")
self.dataname_save.setIcon(icon)
self.canvas = Canvas(data_tab)
self.axe = self.canvas.figure.add_subplot(111)
self.canvas.figure.subplots_adjust(left=0.025,top=0.965,bottom=0.040,right=0.975)
# add the tab to the parent
parent.addTab(self,"")
# set text name
parent.setTabText(parent.indexOf(self),title)
父母是
self.core_tab = QtWidgets.QTabWidget(self.main_widget)
在主窗口中。
“画布”定义如下:
from matplotlib.backends.backend_qt5agg import figureCanvasQTAgg as figureCanvas
import matplotlib.pyplot as plt
class Canvas(figureCanvas):
def __init__(self,parent=None):
self.figure = plt.figure()
figureCanvas.__init__(self,self.figure)
self.setParent(parent)
点击初始按钮时,会发生这种情况:
new_data_tab = data_tab(self.core_tab,dataname)
# associated data to the variable
associated_data = self._getDataAssociatedToVariable(dataname)
#1. draw Graph
self._drawDataGraph(dataname,associated_data,new_data_tab)
dataname 是上面定义的字符串。 _drawDataGraph 定义如下:
def _drawDataGraph(self,dataname,associatedData,dataWidget):
# 1. draw graph
drawing_dictionary = self._getAllAssociatedVariablesTobedrawn(dataname,associatedData)
producer = drawing_dictionary.get(dataname).get("producer")
consumers = drawing_dictionary.get(dataname).get("consumers")
color_map = []
DG = nx.DiGraph()
DG.add_node(producer)
for cons in consumers:
DG.add_node(cons)
edges_bunch = [(producer,cons,1) for cons in consumers]
DG.add_weighted_edges_from(edges_bunch)
for node in drawing_dictionary.keys():
if node != dataname:
DG.add_node(drawing_dictionary.get(node).get("producer"))
for node_cons in drawing_dictionary.get(node).get("consumers"):
DG.add_node(node_cons)
other_edges_bunch = [(drawing_dictionary.get(node).get("producer"),node_cons,1) for node_cons in
drawing_dictionary.get(node).get("consumers")]
DG.add_weighted_edges_from(other_edges_bunch)
for i in range(len(DG.nodes())):
if i < 1 + len(consumers):
color_map.append("#DCE46F")
else:
color_map.append("#6FA2E4")
#pos = nx.spring_layout(DG,k=0.4,iterations=20)
nx.draw_circular(DG,node_color=color_map,with_labels=True,font_size=8,node_size=1000,node_shape='o')
dataWidget.canvas.draw()
我不会通过函数 _getAllAssociatedVariablesTobedrawn 因为它只是返回带有提供列表的键的字典,这里不是问题。
因此,在创建时(在最初单击按钮时),一切正常,显示了一个精美的 Networkx 图。
def refreshFlowsDiagramFromDataTabs(self):
# loop through all pages
for tab_index in range(self.core_tab.count()):
data_tab_widget = self.core_tab.widget(tab_index)
data_tab_widget.axe.cla()
# associated data to the variable
data_name = self.core_tab.tabText(tab_index)
associated_data = self._getDataAssociatedToVariable(data_name)
# 1. draw graph
self._drawDataGraph(data_name,data_tab_widget)
遗憾的是,当按钮被点击时,只有最后一个图(所以第 n 个选项卡中的一个)被刷新,之前的都是空白的(因为它们已经通过 data_tab_widget.axe.cla 清除了) ())
我试图评论 data_tab_widget.axe.cla() 以观察会发生什么:在这种情况下,显然第 1 到第 (n-1) 个图没有被清除,而是最后一个一个是用前面所有的图做的,即第n个图显示在最后一个。
我绝不是 matplotlib 或 networkx 的专家,所以我不明白我做错了什么,这可能是一件非常简单的事情,但我很乐意在该主题上使用一些帮助。
希望我提供的代码足够了,应该是。
编辑
请在下面找到一个完全可复制的代码:添加标签然后刷新它们以观察错误。
import sys
from PyQt5 import QtCore,QtGui,QtWidgets
from matplotlib.backends.backend_qt5agg import figureCanvasQTAgg as figureCanvas
import matplotlib.pyplot as plt
import networkx as nx
class Canvas(figureCanvas):
def __init__(self,self.figure)
self.setParent(parent)
class data_tab(QtWidgets.QWidget):
#=========================================================================================
# Constructor
#=========================================================================================
def __init__(self,title):
QtWidgets.QWidget.__init__(self,parent)
self.data_tab_glayout = QtWidgets.qgridLayout(self)
self.data_tab_glayout.setobjectName("data_tab_glayout")
self.canvas = Canvas(self)
self.canvas.setobjectName("canvas")
self.canvas_vlayout = QtWidgets.QVBoxLayout(self.canvas)
self.canvas_vlayout.setobjectName("canvas_vlayout")
self.data_tab_glayout.addWidget(self.canvas,2,1)
self.axe = self.canvas.figure.add_subplot(111)
self.canvas.figure.subplots_adjust(left=0.025,right=0.975)
# add the tab to the parent
parent.addTab(self,"")
# set text name
parent.setTabText(parent.indexOf(self),title)
class spec_writer(QtWidgets.QMainWindow):
#=========================================================================================
# Constructor
#=========================================================================================
def __init__(self,parent=None):
QtWidgets.QMainWindow.__init__(self,parent)
self.showMaximized()
self.centralwidget = QtWidgets.QWidget(self)
self.centralwidget.setobjectName("centralwidget")
self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
self.core_tab = QtWidgets.QTabWidget(self.centralwidget)
self.verticalLayout.addWidget(self.core_tab)
self.add_tab_btn = QtWidgets.QPushButton(self.centralwidget)
self.verticalLayout.addWidget(self.add_tab_btn)
self.refresh_tab_btn = QtWidgets.QPushButton(self.centralwidget)
self.verticalLayout.addWidget(self.refresh_tab_btn)
self.setCentralWidget(self.centralwidget)
self.add_tab_btn.setText("Add Tab")
self.refresh_tab_btn.setText("Refresh Tabs")
self.core_tab.setEnabled(True)
self.core_tab.setTabShape(QtWidgets.QTabWidget.Rounded)
self.core_tab.setElideMode(QtCore.Qt.ElideNone)
self.core_tab.setDocumentMode(False)
self.core_tab.setTabsClosable(True)
self.core_tab.setMovable(True)
self.core_tab.setTabBarautoHide(False)
self.tab_counter = 0
self.random_tabs = [("a",["b","c"]),("d",["e","f","g"]),("h",["i","j","k","l"]),("m",["n"]),("o",["p","q"]),("r",["s","t","u","v","w","x","y","z"])]
self.add_tab_btn.clicked.connect(self.openRandomTab)
self.refresh_tab_btn.clicked.connect(self.refreshAllTabs)
def openRandomTab(self):
tab = data_tab(self.core_tab,"test " + str(self.tab_counter))
self._drawDataGraph(self.tab_counter % len(self.random_tabs),tab)
self.tab_counter += 1
self.core_tab.setCurrentIndex(self.core_tab.indexOf(tab))
def _drawDataGraph(self,tabNb,dataWidget):
# 1. draw graph
producer = self.random_tabs[tabNb][0]
consumers = self.random_tabs[tabNb][1]
color_map = []
DG = nx.DiGraph()
DG.add_node(producer)
for cons in consumers:
DG.add_node(cons)
edges_bunch = [(producer,1) for cons in consumers]
DG.add_weighted_edges_from(edges_bunch)
for i in range(len(DG.nodes())):
if i < 1 + len(consumers):
color_map.append("#DCE46F")
else:
color_map.append("#6FA2E4")
#pos = nx.spring_layout(DG,iterations=20)
nx.draw_circular(DG,node_shape='o')
dataWidget.canvas.draw_idle()
def refreshAllTabs(self):
# loop through all pages and associated to get
for tab_index in range(self.core_tab.count()):
data_tab_widget = self.core_tab.widget(tab_index)
data_tab_widget.axe.cla()
# draw graph
self._drawDataGraph(tab_index % len(self.random_tabs),data_tab_widget)
sys.argv = ['']
app = QtWidgets.QApplication(sys.argv)
cbtc_spec_writer = spec_writer()
cbtc_spec_writer.show()
app.exec_()
解决方法
如果您打算使用后端,则不应使用 pyplot,因为 pyplot 默认仅在当前画布上工作,并且默认情况下它是最后一个。
例如,以下代码(已重新排序和清理)显示了如何实现它:
from PyQt5 import QtCore,QtWidgets
from matplotlib.backends.backend_qt5agg import FigureCanvas
from matplotlib.figure import Figure
import networkx as nx
class DataTab(QtWidgets.QWidget):
def __init__(self,parent=None):
QtWidgets.QWidget.__init__(self,parent)
self.canvas = FigureCanvas(Figure(figsize=(5,3)))
self.axes = self.canvas.figure.add_subplot(111)
self.canvas.figure.subplots_adjust(
left=0.025,top=0.965,bottom=0.040,right=0.975
)
data_tab_glayout = QtWidgets.QGridLayout(self)
data_tab_glayout.addWidget(self.canvas)
class Spec_Writer(QtWidgets.QMainWindow):
def __init__(self,parent=None):
QtWidgets.QMainWindow.__init__(self,parent)
self.showMaximized()
self.core_tab = QtWidgets.QTabWidget(
tabShape=QtWidgets.QTabWidget.Rounded,elideMode=QtCore.Qt.ElideNone,documentMode=False,tabsClosable=True,movable=True,tabBarAutoHide=False,)
self.add_tab_btn = QtWidgets.QPushButton("Add Tab")
self.refresh_tab_btn = QtWidgets.QPushButton("Refresh Tabs")
self.centralwidget = QtWidgets.QWidget()
self.setCentralWidget(self.centralwidget)
self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
self.verticalLayout.addWidget(self.core_tab)
self.verticalLayout.addWidget(self.add_tab_btn)
self.verticalLayout.addWidget(self.refresh_tab_btn)
self.tab_counter = 0
self.random_data = [
("a",["b","c"]),("d",["e","f","g"]),("h",["i","j","k","l"]),("m",["n"]),("o",["p","q"]),("r",["s","t","u","v","w","x","y","z"]),]
self.add_tab_btn.clicked.connect(self.open_random_tab)
self.refresh_tab_btn.clicked.connect(self.refresh_all_tabs)
def open_random_tab(self):
tab = DataTab()
index = self.core_tab.addTab(tab,"test {}".format(self.tab_counter))
self.core_tab.setCurrentIndex(index)
self.tab_counter += 1
self._draw_graph(self.tab_counter % len(self.random_data),tab)
def _draw_graph(self,index,tab):
tab.axes.cla()
producer,consumers = self.random_data[index]
color_map = []
DG = nx.DiGraph()
DG.add_node(producer)
for cons in consumers:
DG.add_node(cons)
edges_bunch = [(producer,cons,1) for cons in consumers]
DG.add_weighted_edges_from(edges_bunch)
for i in range(len(DG.nodes())):
if i < 1 + len(consumers):
color_map.append("#DCE46F")
else:
color_map.append("#6FA2E4")
# pos = nx.spring_layout(DG,k=0.4,iterations=20)
nx.draw_circular(
DG,node_color=color_map,with_labels=True,font_size=8,node_size=1000,node_shape="o",ax=tab.axes,)
tab.canvas.draw()
def refresh_all_tabs(self):
for tab_index in range(self.core_tab.count()):
data_tab_widget = self.core_tab.widget(tab_index)
self._draw_graph(tab_index % len(self.random_data),data_tab_widget)
def main():
app = QtWidgets.QApplication([])
cbtc_spec_writer = Spec_Writer()
cbtc_spec_writer.show()
app.exec_()
if __name__ == "__main__":
main()
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