带有 Qt Designer 的 pyqtgraph：如何将 PlotItems 添加到 GraphicsLayoutWidget

Question

根据pyqtgraph's documentation，我可以将QGraphicsView 提升为GraphicsLayoutWidget。如果我没记错的话，我也可以将QGraphicsView 升级为PlotItem，即情节所在的位置。现在我的问题是，如何使用 Qt Designer 将许多 PlotItems（从 QGraphicsView 提升）添加到 GraphicsLayoutWidget（也从 QGraphicsView 提升）？

我正在使用 pyside2，如果这很重要的话。

Answer 1

PlotItem 不是一个小部件，更不用说 QGraphicsView，所以你不能推广 PlotItem（如果你能做到，如果你展示它会很棒）。 A PlotItem 是属于 QGraphicsView 处理的场景的项目，正如您所说的，它是数据。您必须做的是推广 GraphicsLayoutWidget 并使用代码添加项目。

示例：

design.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Form</class>
 <widget class="QWidget" name="Form">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>400</width>
    <height>300</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Form</string>
  </property>
  <layout class="QVBoxLayout" name="verticalLayout">
   <item>
    <widget class="GraphicsLayoutWidget" name="graphicsView"/>
   </item>
  </layout>
 </widget>
 <customwidgets>
  <customwidget>
   <class>GraphicsLayoutWidget</class>
   <extends>QGraphicsView</extends>
   <header>pyqtgraph</header>
  </customwidget>
 </customwidgets>
 <resources/>
 <connections/>
</ui>

执行：

pyside2-uic design.ui -o design.py -x

design.py

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'design.ui',
# licensing of 'design.ui' applies.
#
# Created: Mon Oct  8 23:14:34 2018
#      by: pyside2-uic  running on PySide2 5.11.2
#
# WARNING! All changes made in this file will be lost!

from PySide2 import QtCore, QtGui, QtWidgets

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(400, 300)
        self.verticalLayout = QtWidgets.QVBoxLayout(Form)
        self.verticalLayout.setObjectName("verticalLayout")
        self.graphicsView = GraphicsLayoutWidget(Form)
        self.graphicsView.setObjectName("graphicsView")
        self.verticalLayout.addWidget(self.graphicsView)

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

    def retranslateUi(self, Form):
        Form.setWindowTitle(QtWidgets.QApplication.translate("Form", "Form", None, -1))

from pyqtgraph import GraphicsLayoutWidget

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Form = QtWidgets.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    Form.show()
    sys.exit(app.exec_())

ma​​in.py

from PySide2 import QtWidgets
from design import Ui_Form
import pyqtgraph as pg
import numpy as np


class Widget(QtWidgets.QWidget, Ui_Form):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)
        self.setupUi(self)

        w1 = self.graphicsView.addPlot()
        w2 = self.graphicsView.addViewBox()
        w2.setAspectLocked(True)
        self.graphicsView.nextRow()
        w3 = self.graphicsView.addPlot()
        w4 = self.graphicsView.addPlot()

        n = 300
        s1 = pg.ScatterPlotItem(size=10, pen=pg.mkPen(None), brush=pg.mkBrush(255, 255, 255, 120))
        pos = np.random.normal(size=(2,n), scale=1e-5)
        spots = [{'pos': pos[:,i], 'data': 1} for i in range(n)] + [{'pos': [0,0], 'data': 1}]
        s1.addPoints(spots)
        w1.addItem(s1)


        s2 = pg.ScatterPlotItem(size=10, pen=pg.mkPen('w'), pxMode=True)
        pos = np.random.normal(size=(2,n), scale=1e-5)
        spots = [{'pos': pos[:,i], 'data': 1, 'brush':pg.intColor(i, n), 'symbol': i%5, 'size': 5+i/10.} for i in range(n)]
        s2.addPoints(spots)
        w2.addItem(s2)

        s3 = pg.ScatterPlotItem(pxMode=False)   ## Set pxMode=False to allow spots to transform with the view
        spots3 = []
        for i in range(10):
            for j in range(10):
                spots3.append({'pos': (1e-6*i, 1e-6*j), 'size': 1e-6, 'pen': {'color': 'w', 'width': 2}, 'brush':pg.intColor(i*10+j, 100)})
        s3.addPoints(spots3)
        w3.addItem(s3)

        s4 = pg.ScatterPlotItem(size=10, pen=pg.mkPen(None), brush=pg.mkBrush(255, 255, 255, 20))
        pos = np.random.normal(size=(2,10000), scale=1e-9)
        s4.addPoints(x=pos[0], y=pos[1])
        w4.addItem(s4)


if __name__ == '__main__':
    import sys

    app = QtWidgets.QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())

输出：