Surface Graph Gallery

Surface Graph Gallery demonstrates three different custom features with Surface3D graphs. The features have their own tabs in the application.

Download this example

datasource.py

# Copyright (C) 2023 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

from math import sin, pi

from PySide6.QtCore import QObject, QRandomGenerator, Slot
from PySide6.QtQml import QmlElement
from PySide6.QtGui import QVector3D
from PySide6.QtDataVisualization import QSurfaceDataItem, QSurface3DSeries


QML_IMPORT_NAME = "SurfaceGallery"
QML_IMPORT_MAJOR_VERSION = 1


@QmlElement
class DataSource(QObject):

    def __init__(self, parent=None):
        super().__init__(parent)
        self.m_index = -1
        self.m_resetArray = None
        self.m_data = []

    @Slot(int, int, int, float, float, float, float, float, float)
    def generateData(self, cacheCount, rowCount, columnCount,
                     xMin, xMax, yMin, yMax, zMin, zMax):
        if not cacheCount or not rowCount or not columnCount:
            return

        self.clearData()

        xRange = xMax - xMin
        yRange = yMax - yMin
        zRange = zMax - zMin
        cacheIndexStep = columnCount / cacheCount
        cacheStep = float(cacheIndexStep) * xRange / float(columnCount)

        # Populate caches
        self.m_data = []
        rand_gen = QRandomGenerator.global_()
        for i in range(0, cacheCount):
            cache = []
            cacheXAdjustment = cacheStep * i
            cacheIndexAdjustment = cacheIndexStep * i
            for j in range(0, rowCount):
                row = []
                rowMod = (float(j)) / float(rowCount)
                yRangeMod = yRange * rowMod
                zRangeMod = zRange * rowMod
                z = zRangeMod + zMin
                rowColWaveAngleMul = pi * pi * rowMod
                rowColWaveMul = yRangeMod * 0.2
                for k in range(0, columnCount):
                    colMod = (float(k)) / float(columnCount)
                    xRangeMod = xRange * colMod
                    x = xRangeMod + xMin + cacheXAdjustment
                    colWave = sin((2.0 * pi * colMod) - (1.0 / 2.0 * pi)) + 1.0
                    rand_nr = rand_gen.generateDouble() * 0.15
                    y = ((colWave * ((sin(rowColWaveAngleMul * colMod) + 1.0)))
                         * rowColWaveMul + rand_nr * yRangeMod)

                    index = k + cacheIndexAdjustment
                    if index >= columnCount:
                        # Wrap over
                        index -= columnCount
                        x -= xRange

                    row.append(QSurfaceDataItem(QVector3D(x, y, z)))
                cache.append(row)
            self.m_data.append(cache)

    @Slot(QSurface3DSeries)
    def update(self, series):
        if series and self.m_data:
            # Each iteration uses data from a different cached array
            self.m_index += 1
            if self.m_index > len(self.m_data) - 1:
                self.m_index = 0

            array = self.m_data[self.m_index]
            newRowCount = len(array)
            newColumnCount = len(array[0])

            # Copy items from our cache to the reset array
            self.m_resetArray = []
            for i in range(0, newRowCount):
                sourceRow = array[i]
                row = []
                for j in range(0, newColumnCount):
                    row.append(QSurfaceDataItem(sourceRow[j].position()))
                self.m_resetArray.append(row)

            # Notify the proxy that data has changed
            series.dataProxy().resetArray(self.m_resetArray)

    @Slot()
    def clearData(self):
        self.m_data = []

main.py

# Copyright (C) 2023 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

"""PySide6 port of the Qt DataVisualization qmlsurfacegallery example from Qt v6.x"""

import os
import sys
from pathlib import Path

from PySide6.QtCore import QCoreApplication, QUrl
from PySide6.QtGui import QGuiApplication
from PySide6.QtQuick import QQuickView
from PySide6.QtDataVisualization import qDefaultSurfaceFormat

from datasource import DataSource
import rc_qmlsurfacegallery


if __name__ == "__main__":
    os.environ["QSG_RHI_BACKEND"] = "opengl"
    app = QGuiApplication(sys.argv)

    viewer = QQuickView()

    # Enable antialiasing in direct rendering mode
    viewer.setFormat(qDefaultSurfaceFormat(True))

    viewer.engine().quit.connect(QCoreApplication.quit)

    viewer.setTitle("Surface Graph Gallery")

    qml_file = Path(__file__).resolve().parent / "qml" / "qmlsurfacegallery" / "main.qml"
    viewer.setSource(QUrl.fromLocalFile(qml_file))
    viewer.setResizeMode(QQuickView.SizeRootObjectToView)
    viewer.show()

    ex = app.exec()
    del viewer
    sys.exit(ex)

qmlsurfacegallery.qrc

<RCC>
    <qresource prefix="/">
        <file>qml/qmlsurfacegallery/heightmap.png</file>
    </qresource>
</RCC>

qml/qmlsurfacegallery/SpectrogramData.qml

// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

import QtQuick

Item {
    property alias model: dataModel

    ListModel {
        id: dataModel
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