如何将 yaxis 刻度标签设置在固定位置，以便当我向左或向右滚动时，yaxis 刻度标签应该可见?

How to set yaxis tick label in a fixed position so that when i scroll left or right the yaxis tick label should be visible?(如何将 yaxis 刻度标签设置在固定位置，以便当我向左或向右滚动时，yaxis 刻度标签应该可见?)

问题描述

在我的程序中，我先绘制了图，然后将图导入到画布中.然后我将画布导入滚动区域.当我运行我的程序时，如果我向左滚动 yaxis 刻度标签会隐藏，或者我向右滚动 yaxis 刻度标签也会隐藏.我采取了两个轴.轴，轴 2.我已经设置了 axes2.yaxis.tick_right() 和 axes.yaxis.tick_right().

in my program i have taken figure first then i import figue into canvas. Then i import canvas into scroll area. when i run my program ,then if i turn left scroll the yaxis tick label goes hide or i turn right scroll the yaxis tick label goes also hide. i have taken two axis. axis,axis2. i have set axes2.yaxis.tick_right() and axes.yaxis.tick_right().

我希望 yaxis 刻度标签将保持在右侧并且别名可见，无论我向左或向右滚动.

import sys
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
import matplotlib.pyplot as plt
from matplotlib.figure import Figure
from PyQt5.QtWidgets import QMainWindow,QVBoxLayout
from PyQt5.QtWidgets import QApplication
from PyQt5 import QtCore, QtGui, QtWidgets
import datetime
from matplotlib.dates import num2date, date2num
from mpl_finance import candlestick_ochl as candlestick
import numpy as np
import matplotlib.ticker as ticker
import matplotlib.dates as mdates
import pylab as pl
class MainWindow_code_serarch(object):

    def setup_code_serarch(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(870, 680)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayoutWidget1 = QtWidgets.QWidget(self.centralwidget)
        self.verticalLayoutWidget1.setGeometry(QtCore.QRect(17, 30, 741, 13))
        self.verticalLayoutWidget1.setObjectName("verticalLayoutWidget")
        self.verticalLayout1 = QtWidgets.QVBoxLayout(self.verticalLayoutWidget1)
        self.verticalLayout1.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout1.setObjectName("verticalLayout1")
        self.verticalLayoutWidget = QtWidgets.QWidget(self.centralwidget)
        self.verticalLayoutWidget.setGeometry(QtCore.QRect(17, 10, 940, 603))
        self.verticalLayoutWidget.setObjectName("verticalLayoutWidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.verticalLayoutWidget)
        self.verticalLayout.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout.setObjectName("verticalLayout")
        self.figure = Figure(figsize=(100,7.2), dpi=80, facecolor='k')
        self.canvas = FigureCanvas(self.figure)
        self.widget = QtWidgets.QWidget()
        self.scroll_area = QtWidgets.QScrollArea(self.widget)
        self.scroll_area.setWidget(self.canvas)
        self.verticalLayout.addWidget(self.scroll_area)
        axes,axes2 = self.figure.subplots(nrows=2, sharex=True)
        data = {
            'date': ['2018/10/30', '2018/11/03', '2018/11/04', '2018/11/05', '2018/11/07', '2018/11/10', '2018/11/11'],
            'open': [8824, 8726.31, 8642.14, 8531.51, 8630.25, 8602.50, 8640.22],
            'high': [8858, 8748.60, 8551.36, 8653.16, 8476.69, 8630, 8570.56],
            'low': [8688, 8743.67, 8550.76, 8449.50, 8631.83, 8602.18, 8743.22],
            'close': [8820, 8747.17, 8550.52, 8553., 8517.10, 8628.78, 8588.52],
            'volume': [17759.56, 120000.17, 18739.52, 38599.50, 16517.10, 17723.78, 15588.52]
        }
        x = date2num([datetime.datetime.strptime(d, '%Y/%m/%d').date() for d in data['date']])
        t= np.arange(len(data['date']))
        candle_trace = zip(t, data['open'], data['high'], data['low'], data['close'], data['volume'])
        candlestick(axes, candle_trace, width=.75, colorup='g', colordown='r')
        axes2.plot(t, [1, 2, 3, 4, 7, 8, 9])
        axes.set_position([0.02, 0.37, 0.88, 0.6])
        axes2.set_position([0.02, 0.15, 0.88, 0.22])
        axes.tick_params(axis='both', color='#ffffff', labelcolor='#ffffff')
        axes.yaxis.tick_right()
        axes2.tick_params(axis='both', color='#ffffff', labelcolor='#ffffff')
        axes2.grid(color='lightgray', linewidth=.5, linestyle=':')
        axes.grid(color='lightgray', linewidth=.5, linestyle=':')
        axes2.yaxis.tick_right()
        axes.autoscale_view()
        axes2.autoscale_view()
        axes.set_facecolor('#041105')
        axes2.set_facecolor('#041105')
        # N = len(dates)
        axes.set_xticks(range(0, len((x)), 1))
        axes.set_xticklabels([mdates.num2date(d).strftime('%b-%d') for d in x])
        axes.set_xticklabels([mdates.num2date(d).strftime('%Y-%m-%d') for d in x])
        axes2.set_xticklabels([mdates.num2date(d).strftime('%Y-%m-%d') for d in x])
        self.canvas.draw()
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 246, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        # self.pushButton.clicked.connect(self.graphShowCode)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        # self.pushButton.setText(_translate("MainWindow", "OK"))
if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = MainWindow_code_serarch()
    ui.setup_code_serarch(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

输出图像:

当我向左滚动输出图像 2:

when i turn scroll left output image 2:

推荐答案

这是一种使用 PyQt QtScrollBar 滚动轴内容的方法.这是通过根据滚动条的值更改轴的限制来完成的.为此，注册了对 QtScrollBar 的 actionTriggered 方法的回调，该方法会更改坐标轴的限制.

Here is a way to scroll the content of an axes with a PyQt QtScrollBar. This is done by changing the limits of the axes depending on the scroll bar's value. To this end, a callback to the QtScrollBar's actionTriggered method is registered that changes the limits of the axes.

import sys
import matplotlib
# Make sure that we are using QT5
matplotlib.use('Qt5Agg')
import matplotlib.pyplot as plt
from PyQt5 import QtWidgets, QtCore
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.backends.backend_qt5agg import NavigationToolbar2QT as NavigationToolbar
import numpy as np

class ScrollableWindow(QtWidgets.QMainWindow):
    def __init__(self, fig, ax, step=0.1):
        plt.close("all")
        if not QtWidgets.QApplication.instance():
            self.app = QtWidgets.QApplication(sys.argv)
        else:
            self.app = QtWidgets.QApplication.instance() 

        QtWidgets.QMainWindow.__init__(self)
        self.widget = QtWidgets.QWidget()
        self.setCentralWidget(self.widget)
        self.widget.setLayout(QtWidgets.QVBoxLayout())
        self.widget.layout().setContentsMargins(0,0,0,0)
        self.widget.layout().setSpacing(0)

        self.fig = fig
        self.ax = ax
        self.canvas = FigureCanvas(self.fig)
        self.canvas.draw()
        self.scroll = QtWidgets.QScrollBar(QtCore.Qt.Horizontal)
        self.step = step
        self.setupSlider()
        self.nav = NavigationToolbar(self.canvas, self.widget)
        self.widget.layout().addWidget(self.nav)
        self.widget.layout().addWidget(self.canvas)
        self.widget.layout().addWidget(self.scroll)

        self.canvas.draw()
        self.show()
        self.app.exec_()

    def setupSlider(self):
        self.lims = np.array(self.ax.get_xlim())
        self.scroll.setPageStep(self.step*100)
        self.scroll.actionTriggered.connect(self.update)
        self.update()

    def update(self, evt=None):
        r = self.scroll.value()/((1+self.step)*100)
        l1 = self.lims[0]+r*np.diff(self.lims)
        l2 = l1 +  np.diff(self.lims)*self.step
        self.ax.set_xlim(l1,l2)
        print(self.scroll.value(), l1,l2)
        self.fig.canvas.draw_idle()


# create a figure and some subplots
fig, ax = plt.subplots()
t = np.linspace(0,3000,101)
x = np.cumsum(np.random.randn(len(t)))
ax.plot(t,x, marker="o")

# pass the figure to the custom window
a = ScrollableWindow(fig,ax)

对于图中内的滚动条，请参阅可滚动条形图matplotlib

For a Scrollbar within the figure, see Scrollable Bar graph matplotlib

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