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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from __future__ import annotations
import random
import numpy as np
from PySide6.QtGui import QVector3D
from PySide6.QtQml import QmlElement
from PySide6.QtQuick3D import QQuick3DGeometry
QML_IMPORT_NAME = "ExamplePointGeometry"
QML_IMPORT_MAJOR_VERSION = 1
@QmlElement
class ExamplePointGeometry(QQuick3DGeometry):
def __init__(self, parent=None):
QQuick3DGeometry.__init__(self, parent)
self.updateData()
def updateData(self):
self.clear()
# We use numpy arrays to handle the vertex data,
# but still we need to consider the 'sizeof(float)'
# from C to set the Stride, and Attributes for the
# underlying Qt methods
FLOAT_SIZE = 4
NUM_POINTS = 2000
stride = 3
vertexData = np.zeros(NUM_POINTS * stride, dtype=np.float32)
p = 0
for i in range(NUM_POINTS):
vertexData[p] = random.uniform(-5.0, +5.0)
p += 1
vertexData[p] = random.uniform(-5.0, +5.0)
p += 1
vertexData[p] = 0.0
p += 1
self.setVertexData(vertexData.tobytes())
self.setStride(stride * FLOAT_SIZE)
self.setBounds(QVector3D(-5.0, -5.0, 0.0), QVector3D(+5.0, +5.0, 0.0))
self.setPrimitiveType(QQuick3DGeometry.PrimitiveType.Points)
self.addAttribute(
QQuick3DGeometry.Attribute.Semantic.PositionSemantic, 0,
QQuick3DGeometry.Attribute.ComponentType.F32Type
)
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