向图形添加导航工具栏（matplotlib和PyQt4）

Question

我想在我的PyQt4 GUI中创建一个导航工具栏，但是我无法使其正常工作。我必须承认，我大多数时间都是复制粘贴这段代码，我真的不理解它。如果您能告诉我如何添加NavigationToolbar并解释它是如何制作的，那将非常好。提前致谢。

顺便说一句，我看过这篇文章，但我认为它与我的情况不同，我无法弄清楚如何使用它。

from PyQt4 import QtGui
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas

from matplotlib.figure import Figure

class MplCanvas(FigureCanvas):

    def __init__( self ):
        self.fig = Figure()
        self.ax = self.fig.add_subplot( 111 )

        FigureCanvas.__init__( self, self.fig )
        FigureCanvas.setSizePolicy( self, QtGui.QSizePolicy.Expanding,QtGui.QSizePolicy.Expanding )
        FigureCanvas.updateGeometry( self )


class matplotlibWidget(QtGui.QWidget):

    def __init__( self, parent = None ):
        QtGui.QWidget.__init__( self, parent )
        self.canvas = MplCanvas()
        #self.toolbar = self.canvas.toolbar #Dunno How :(

        self.vbl = QtGui.QVBoxLayout()
        self.vbl.addWidget( self.canvas )
        self.setLayout( self.vbl )

- Zwierzak

Answer 1

我成功解决了问题，代码应该像这样:

from PyQt4 import QtGui
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.backends.backend_qt4 import NavigationToolbar2QT as NavigationToolbar
from matplotlib.figure import Figure

class MplCanvas(FigureCanvas):

    def __init__( self ):
        self.fig = Figure()
        self.ax = self.fig.add_subplot( 111 )

        FigureCanvas.__init__( self, self.fig )
        FigureCanvas.setSizePolicy( self, QtGui.QSizePolicy.Expanding,QtGui.QSizePolicy.Expanding )
        FigureCanvas.updateGeometry( self )


class matplotlibWidget(QtGui.QWidget):

    def __init__( self, parent = None ):
        QtGui.QWidget.__init__( self, parent )
        self.canvas = MplCanvas() #create canvas that will hold our plot
        self.navi_toolbar = NavigationToolbar(self.canvas, self) #createa navigation toolbar for our plot canvas

        self.vbl = QtGui.QVBoxLayout()
        self.vbl.addWidget( self.canvas )
        self.vbl.addWidget(self.navi_toolbar)
        self.setLayout( self.vbl )

- Zwierzak

---

我在想是否有一种方法可以在画布类声明中声明NavigationToolbar，而不是在小部件/用户界面中声明。通常我的UI文件是从QtDesigner自动生成的，然后我只需要在主程序中导入它们并围绕它们构建逻辑，因此理想情况下，该程序中不应出现任何像.addWidget这样的内容。 - Guimoute