问题描述
该示例使用文件'QtChart.ui'(这很重要),其中嵌入了 Pyqtgraph 的小部件(这也很重要)。
问题: 显示了该图,但是显示了从纪元开始到现在的秒数,而不是日期时间轴。
我设置了变量axis = pg.DateAxisItem(orientation='bottom')
在示例之后,应该将其添加到这样的行pw = pg.PlotWidget(viewBox=vb,axisItems={'bottom': axis})
中,但是我的代码中没有这样的行。
如何设置日期时间轴而不是从纪元开始算起的秒数?
代码:
import random
import sys
from PyQt5.QtCore import *
from PyQt5 import QtWidgets,uic
from PyQt5.QtWidgets import QMainWindow
import time
import pyqtgraph as pg
x = []
y = []
class draw_interface(QMainWindow):
def __init__(self):
super(draw_interface,self).__init__()
uic.loadUi('QtChart.ui',self)
self.timer_update_events = QTimer()
self.timer_update_events.timeout.connect(self.update_chart)
self.timer_update_events.start(1000)
axis = pg.DateAxisItem(orientation='bottom')
self.line = pg.PlotCurveItem(clear=True,pen="g")
self.widget.addItem(self.line)
self.show()
def update_chart(self):
global x,y
x.append(time.time())
y.append(random.uniform(0,1))
self.line.setData(x,y)
my_app = QtWidgets.QApplication([])
my_main_window = draw_interface()
sys.exit(my_app.exec_())
并输入代码'QtChart.ui':
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>1319</width>
<height>1091</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralwidget">
<layout class="QHBoxLayout" name="horizontalLayout">
<item>
<layout class="qgridLayout" name="gridLayout">
<property name="leftMargin">
<number>10</number>
</property>
<property name="topMargin">
<number>10</number>
</property>
<property name="rightMargin">
<number>10</number>
</property>
<property name="bottomMargin">
<number>10</number>
</property>
<item row="0" column="0">
<widget class="qframe" name="frame_2">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Expanding">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="maximumSize">
<size>
<width>200</width>
<height>16777215</height>
</size>
</property>
<property name="frameShape">
<enum>qframe::StyledPanel</enum>
</property>
<property name="frameShadow">
<enum>qframe::Raised</enum>
</property>
</widget>
</item>
<item row="0" column="1">
<widget class="PlotWidget" name="widget" native="true"/>
</item>
</layout>
</item>
</layout>
</widget>
<widget class="QMenuBar" name="menubar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>1319</width>
<height>21</height>
</rect>
</property>
</widget>
<widget class="QStatusBar" name="statusbar"/>
</widget>
<customwidgets>
<customwidget>
<class>PlotWidget</class>
<extends>QWidget</extends>
<header location="global">pyqtgraph</header>
<container>1</container>
</customwidget>
</customwidgets>
<resources/>
<connections/>
</ui>
解决方法
您必须使用setAxisItems()
方法:
# ...
axis = pg.DateAxisItem(orientation='bottom')
self.line = pg.PlotCurveItem(clear=True,pen="g")
self.widget.addItem(self.line)
self.widget.setAxisItems({"bottom": axis})
# ...