我正在尝试在 PyQt5 的 pqytplot 图小部件中添加光标位置的读数。我发现这段代码可以实现我想要的功能,但是在一个独立的窗口中,所有这些都在一个程序文件中:
import pyqtgraph as pg
from pyqtgraph.Qt import QtGui, QtCore
#generate layout
app = QtGui.QApplication([])
win = pg.GraphicsWindow()
label = pg.LabelItem(justify='right')
win.addItem(label)
p1 = win.addPlot(row=1, col=0)
data1 = [n**2 for n in range(100)]
p1.plot(data1, pen="r")
#cross hair
vLine = pg.InfiniteLine(angle=90, movable=False)
hLine = pg.InfiniteLine(angle=0, movable=False)
p1.addItem(vLine, ignoreBounds=True)
p1.addItem(hLine, ignoreBounds=True)
def mouseMoved(evt):
pos = evt[0] ## using signal proxy turns original arguments into a tuple
if p1.sceneBoundingRect().contains(pos):
mousePoint = p1.vb.mapSceneToView(pos)
index = int(mousePoint.x())
if index > 0 and index < len(data1):
label.setText("<span style='font-size: 12pt'>x=%0.1f, <span style='color: red'>y1=%0.1f</span>" % (mousePoint.x(), data1[index]))
vLine.setPos(mousePoint.x())
hLine.setPos(mousePoint.y())
proxy = pg.SignalProxy(p1.scene().sigMouseMoved, rateLimit=60, slot=mouseMoved)
## Start Qt event loop unless running in interactive mode or using pyside.
if __name__ == '__main__':
import sys
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
QtGui.QApplication.instance().exec_()
我遇到的问题是弄清楚如何使用我的 GUI 实现类似的东西 - 我必须将对plotwidget 的引用传递给 mouseMoved 函数。在上面的示例中,mousemoved 函数可以访问 hline、vline 和 p1,但在我的代码中却不能 - 我需要能够传递这些内容。但我不知道该怎么做。
我尝试用尽可能少的代码来复制这个问题。首先,这是一个简单的 GUI 文件,名为 CursorLayout.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>1167</width>
<height>443</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralwidget">
<layout class="QGridLayout" name="gridLayout_2">
<item row="0" column="0">
<layout class="QVBoxLayout" name="verticalLayout_6">
<item>
<layout class="QHBoxLayout" name="horizontalLayout_16">
<property name="sizeConstraint">
<enum>QLayout::SetFixedSize</enum>
</property>
<item>
<layout class="QVBoxLayout" name="verticalLayout">
<item>
<layout class="QHBoxLayout" name="horizontalLayout_4">
<item>
<widget class="QPushButton" name="startbutton">
<property name="sizePolicy">
<sizepolicy hsizetype="Fixed" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="text">
<string>Plot</string>
</property>
</widget>
</item>
</layout>
</item>
</layout>
</item>
</layout>
</item>
<item>
<layout class="QVBoxLayout" name="verticalLayout_5">
<item>
<widget class="PlotWidget" name="plotWidget" native="true">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Preferred">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="minimumSize">
<size>
<width>0</width>
<height>300</height>
</size>
</property>
</widget>
</item>
<item>
<layout class="QHBoxLayout" name="horizontalLayout_3"/>
</item>
<item>
<layout class="QHBoxLayout" name="horizontalLayout_17">
<property name="spacing">
<number>0</number>
</property>
<item>
<widget class="QPushButton" name="exitbutton">
<property name="sizePolicy">
<sizepolicy hsizetype="Fixed" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="text">
<string>Exit</string>
</property>
</widget>
</item>
</layout>
</item>
</layout>
</item>
</layout>
</item>
</layout>
</widget>
</widget>
<customwidgets>
<customwidget>
<class>PlotWidget</class>
<extends>QWidget</extends>
<header location="global">pyqtgraph</header>
<container>1</container>
</customwidget>
</customwidgets>
<resources/>
<connections/>
</ui>
主要程序是这样的:
from PyQt5 import uic
from PyQt5.QtWidgets import QApplication, QMainWindow
from initGUI import connecttolayout, setinitialview
class UI(QMainWindow):
def __init__(self):
super(UI, self).__init__()
uic.loadUi("CursorLayout.ui", self) #load GUI layout file created with QtDesigner
connecttolayout(self) # connect code to elements in UI file
setinitialview(self) # set initial view (button/label visibility, default values, etc)
self.show()
def clickedstartButton(self): #action if start button clicked
self.plotWidget.clear()
plotx = range(100)
ploty = [number**2 for number in plotx]
thisline = self.plotWidget.plot(plotx, ploty, pen='r')
QApplication.processEvents()
def clickedexitButton(self):
self.close()
app=QApplication([])
UIWindow=UI()
app.exec()
包含用于设置 gui 的代码的文件 initGUI.py (不一定要如何执行此操作,但这是为了模仿我的较大程序的文件结构):
from PyQt5.QtWidgets import QPushButton
import pyqtgraph as pg
def connecttolayout(self): #connect GUI elements to elements in UI file
self.startButton = self.findChild(QPushButton, "startbutton")
self.exitButton = self.findChild(QPushButton, "exitbutton")
self.startButton.clicked.connect(self.clickedstartButton)
self.exitButton.clicked.connect(self.clickedexitButton)
def mouseMoved(evt):
pos = evt[0] ## using signal proxy turns original arguments into a tuple
if self.plotWidget.sceneBoundingRect().contains(pos):
mousePoint = self.plotWidget.vb.mapSceneToView(pos)
index = int(mousePoint.x())
#if index > 0 and index < len(data1):
if index > 0 and index < self.MFmax:
self.cursorlabel.setText("<span style='font-size: 12pt'>x=%0.1f, <span style='color: red'>y=%0.1f</span>" % (
mousePoint.x(), mousePoint.y()))
self.vLine.setPos(mousePoint.x())
self.hLine.setPos(mousePoint.y())
def setinitialview(self): #set initial view to pvst view and clear plot window
#set plot initial configuration
self.plotWidget.setBackground('w')
self.plotWidget.setLabels(left=('Pressure', 'Torr'))
self.plotWidget.setLabel('left',color='black',size=30)
self.plotWidget.setLabels(bottom=('Time', 's'))
self.plotWidget.setLabel('bottom',color='black',size=30)
self.plotWidget.clear()
# cross hair
self.vLine = pg.InfiniteLine(angle=90, movable=False)
self.hLine = pg.InfiniteLine(angle=0, movable=False)
self.plotWidget.addItem(self.vLine, ignoreBounds=True)
self.plotWidget.addItem(self.hLine, ignoreBounds=True)
self.cursorlabel = pg.LabelItem(justify='right')
proxy = pg.SignalProxy(self.plotWidget.scene().sigMouseMoved, rateLimit=60, slot=mouseMoved)
实际上,我很惊讶我的尝试没有导致错误 - 按绘图按钮确实创建了一个绘图,但它绝对不会在 GUI 的图形中创建光标。
如何获取传递给 mouseMoved 函数的必要信息?