Question

以下代码使用Button和Progressbar创建一个Widget。当按下按钮并且进度条达到100％时，将显示3个图（通过Matplotlib.pyplot）：

import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *
import matplotlib.pyplot as plt
import pandas as pd

class App(QMainWindow):

    def __init__(self):
        super(App, self).__init__()
        self.setGeometry(500, 300, 820, 350)
        self.setWindowTitle("Program")

        #Buttons
        btnposx = 30
        btnposy = 50

        self.btn4 = QPushButton('Load', self)
        self.btn4.move(btnposx,btnposy+220)       
        self.btn4.released.connect(self.thread)

        #ProgressBar
        self.pb = QProgressBar(self)
        self.pb.move(btnposx+150,btnposy+220)
        self.pb.resize(470,27)        

        self.show()

    @pyqtSlot(float)
    def load(self, val):
        self.pb.setValue(val)

    @pyqtSlot(object)
    def plot(self, pq):
        pq.plot(grid = 1)
        plt.show()

    def thread(self):
        self.thread_ = Thread()
        self.thread_.pb_signal.connect(self.load, Qt.QueuedConnection)
        self.thread_.plot_signal.connect(self.plot, Qt.QueuedConnection)
        self.thread_.start()

class Thread(QThread):
    pb_signal = pyqtSignal(float)
    plot_signal = pyqtSignal(object)

    def __init__(self, *args, **kwargs):
        QThread.__init__(self, *args, **kwargs)

    def __del__(self):
        self.wait()

    @pyqtSlot()    
    def run(self):       
        val = 0
        self.pb_signal.emit(20)
        l = range(50000000)
        for i in l:
            val += 1
        self.pb_signal.emit(60)
        self.pb_signal.emit(100)
        pq = pd.DataFrame(data = {'col1':[1,2,3,4,5,6], 'col2':[6,5,4,3,2,1]})
        self.plot_signal.emit(pq)
        self.plot_signal.emit(pq)
        self.plot_signal.emit(pq)        
        return

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    ex.show()
    sys.exit(app.exec_())

如何使用FigureCanvas完成相同的事情？我不想做一个窗口，因为3个图是嵌入的，但是3个单独的数字。关于如何以这种方式使用FigureCanvas的在线信息是非常稀缺的。

Answer 1

FigureCanvas是一个专门的QWidget，它可以包含一个matplotlib图，并且在该图中你可以制作图，所以解决方案是为每个发射创建一个，除此之外，绘图函数还有一个接收的参数它将被绘制的轴，因此您必须传递在图中创建的轴：

import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *
import pandas as pd
from matplotlib.backends.backend_qt4agg import (
        FigureCanvas, NavigationToolbar2QT as NavigationToolbar)
from matplotlib.figure import Figure

class App(QMainWindow):

    def __init__(self):
        super(App, self).__init__()
        self.setGeometry(500, 300, 820, 350)
        self.setWindowTitle("Program")

        #Buttons
        btnposx = 30
        btnposy = 50

        self.btn4 = QPushButton('Load', self)
        self.btn4.move(btnposx,btnposy+220)       
        self.btn4.released.connect(self.thread)

        #ProgressBar
        self.pb = QProgressBar(self)
        self.pb.move(btnposx+150,btnposy+220)
        self.pb.resize(470,27)        
        self.canvas = []
        self.show()

    @pyqtSlot(float)
    def load(self, val):
        self.pb.setValue(val)

    @pyqtSlot(object)
    def plot(self, pq):
        cv = FigureCanvas(Figure(figsize=(5, 3)))
        ax = cv.figure.subplots()
        pq.plot(grid = 1, ax=ax)
        cv.show()
        # avoid garbage collector
        self.canvas.append(cv)

    def thread(self):
        self.thread_ = Thread()
        self.thread_.pb_signal.connect(self.load, Qt.QueuedConnection)
        self.thread_.plot_signal.connect(self.plot, Qt.QueuedConnection)
        self.thread_.start()

class Thread(QThread):
    pb_signal = pyqtSignal(float)
    plot_signal = pyqtSignal(object)

    def __del__(self):
        self.wait()

    @pyqtSlot()    
    def run(self):       
        val = 0
        self.pb_signal.emit(20)
        l = range(50000000)
        for i in l:
            val += 1
        self.pb_signal.emit(60)
        self.pb_signal.emit(100)
        pq = pd.DataFrame(data = {'col1':[1,2,3,4,5,6], 'col2':[6,5,4,3,2,1]})
        self.plot_signal.emit(pq)
        self.plot_signal.emit(pq)
        self.plot_signal.emit(pq)        

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    ex.show()
    sys.exit(app.exec_())

注意：仅创建列表以防止垃圾收集器删除图

在PyQt4中使用FigureCanvas创建几个弹出图

1 个答案: