使用 NavigationToolbar 进行缩放在使用 pyqt 的 matplotlib 中不起作用
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【中文标题】使用 NavigationToolbar 进行缩放在使用 pyqt 的 matplotlib 中不起作用【英文标题】:zooming with NavigationToolbar does not work in matplotlib with pyqt 【发布时间】:2016-08-24 18:53:50 【问题描述】:我尝试使用 python 2.7、matplotlib、qt5(5.7 版)和 pyqt5 绘制数据。我举了一个例子,并根据我的需要进行了调整。我看到 NavigationToolbar 已添加到绘图窗口,但缩放不起作用。我不确定 NavigationToolbar 对象的第二个参数应该是什么?
import sys
import matplotlib
matplotlib.use("Qt5Agg")
from numpy import arange, sin, pi
from matplotlib.backends.backend_qt5agg import NavigationToolbar2QT as NavigationToolbar
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
from PyQt5.QtWidgets import QWidget, QMainWindow, QApplication, QSizePolicy, QVBoxLayout, QPushButton
from PyQt5.QtCore import *
from PyQt5.QtGui import QCursor
class MyMplCanvas(FigureCanvas):
"""Ultimately, this is a QWidget (as well as a FigureCanvasAgg, etc.)."""
def __init__(self, parent=None, width=5, height=4, dpi=100):
fig = Figure(figsize=(width, height), dpi=dpi)
self.fig = fig
self.axes = fig.add_subplot(111)
# We want the axes cleared every time plot() is called
self.axes.hold(False)
self.compute_initial_figure()
FigureCanvas.__init__(self, fig)
self.setParent(parent)
FigureCanvas.setSizePolicy(self,
QSizePolicy.Expanding,
QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)
def compute_initial_figure(self):
pass
class MyStaticMplCanvas(MyMplCanvas):
"""Simple canvas with a sine plot."""
def compute_initial_figure(self):
t = arange(0.0, 3.0, 0.01)
s = sin(2*pi*t)
self.axes.plot(t, s)
class ApplicationWindow(QWidget):
def __init__(self):
QWidget.__init__(self)
self.setAttribute(Qt.WA_DeleteOnClose)
self.main_widget = QWidget(self)
self.l = QVBoxLayout(self)
but = QPushButton("make_new", self)
but.clicked.connect(self.again)
self.l.addWidget(but)
def again(self):
sc = MyStaticMplCanvas(self, width=5, height=4, dpi=100)
self.sc = sc
win = MyMplCanvas()
win.fig = self.sc.fig
FigureCanvas.__init__(win, win.fig)
self.win = win
self.mpl_toolbar = NavigationToolbar(self.sc, self.win)
win.show()
qApp = QApplication(sys.argv)
aw = ApplicationWindow()
aw.show()
sys.exit(qApp.exec_())
【问题讨论】:
【参考方案1】:如果有人也感兴趣,我是这样解决的:
import sys
import matplotlib
matplotlib.use("Qt5Agg")
import numpy as np
from numpy import arange, sin, pi
from matplotlib.backends.backend_qt5agg import NavigationToolbar2QT as NavigationToolbar
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
from PyQt5.QtWidgets import QWidget, QMainWindow, QApplication, QSizePolicy, QVBoxLayout, QPushButton
from PyQt5.QtCore import *
from PyQt5.QtGui import QCursor
class MyMplCanvas(FigureCanvas):
#Ultimately, this is a QWidget (as well as a FigureCanvasAgg, etc.).
def __init__(self, parent=None, width=5, height=4, dpi=100):
fig = Figure(figsize=(width, height), dpi=dpi)
self.fig = fig
self.axes = fig.add_subplot(111)
# We want the axes cleared every time plot() is called
self.axes.hold(False)
self.compute_initial_figure()
FigureCanvas.__init__(self, fig)
self.setParent(parent)
FigureCanvas.setSizePolicy(self,
QSizePolicy.Expanding,
QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)
def compute_initial_figure(self):
pass
class MyStaticMplCanvas(MyMplCanvas):
#Simple canvas with a sine plot.
def compute_initial_figure(self):
t = arange(0.0, 3.0, 0.01)
s = sin(2*pi*t)
self.axes.plot(t, s)
class PlotDialog(QWidget):
def __init__(self):
QWidget.__init__(self)
self.plot_layout = QVBoxLayout(self)
self.plot_canvas = MyStaticMplCanvas(self, width=5, height=4, dpi=100)
self.navi_toolbar = NavigationToolbar(self.plot_canvas, self)
self.plot_layout.addWidget(self.plot_canvas) # the matplotlib canvas
self.plot_layout.addWidget(self.navi_toolbar)
if __name__ == "__main__":
import sys
app = QApplication(sys.argv)
dialog = PlotDialog()
dialog.show()
sys.exit(app.exec_())
【讨论】:
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