Question

我正在尝试在QML桌面应用程序内部使用pyqtgraph。

我正在使用python 3.7（pyqtgraph的当前dev分支）和pyside2（qt 5.11.2）。

这是我的example.qml

    import QtQuick 2.11
    import QtQuick.Controls 1.4
    import QtQuick.Layouts 1.11
    import my_pyqtgraph 1.0

    ApplicationWindow {
        visible: true
        width: 800
        height: 600

        Rectangle {
            id: plotRect
            color: "white"
            Layout.fillWidth: true
            Layout.fillHeight: true
            PyQtGraph {
                id: waveformPlot
                width: 700
                height: 500
            }
        }
    }

这是我的example.py

    import sys
    import os

    import numpy as np
    import pyqtgraph as pg

    os.environ["QT_API"] = "pyside2"

    from qtpy.QtQuick import QQuickItem
    from qtpy.QtCore import QUrl
    from qtpy.QtWidgets import QApplication, QGraphicsProxyWidget
    from qtpy.QtQml import qmlRegisterType, QQmlApplicationEngine


    class Graph(QQuickItem):

        def __init__(self, parent=None):
            super().__init__(parent)
            self.dataPlot = np.cos(np.linspace(0, 2 * np.pi, 1000))

            self.graph = pg.PlotItem()
            self.graph.plot(self.dataPlot, pen=(0, 255, 0))

            self.view = pg.GraphicsView()
            self.view.setCentralItem(self.graph)

            mproxy = QGraphicsProxyWidget(self.graph)
            mproxy.setWidget(self.view)


    if __name__ == "__main__":
        app = QApplication(sys.argv)
        engine = QQmlApplicationEngine()

        qmlRegisterType(Graph, "my_pyqtgraph", 1, 0, "PyQtGraph")

        engine.load(QUrl("fred/example.qml"))
        sys.exit(app.exec_())

我最终只有一个指定大小的空白窗口。

我碰到了这篇文章：Graph (pyqtgraph) is not getting plotted inside QML generated window但是那里的答案已经过时了。来自qt5文档：

https://doc.qt.io/qt-5/qtquick-porting-qt5.html#qdeclarativeitem-and-qdeclarativeview

移植到QQuickItem时，请注意QDeclarativeItem继承自QGraphicsItem；相比之下，QQuickItem直接从QObject继承，并且任何特定于QGraphicsItem的功能都不再可用。

任何建议将不胜感激。

在QML应用程序中显示pyqtgraph

0 个答案: