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#############################################################################
##
## Copyright (C) 2021 The Qt Company Ltd.
## Contact: https://www.qt.io/licensing/
##
## This file is part of the Qt for Python examples of the Qt Toolkit.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
## * Redistributions of source code must retain the above copyright
## notice, this list of conditions and the following disclaimer.
## * Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in
## the documentation and/or other materials provided with the
## distribution.
## * Neither the name of The Qt Company Ltd nor the names of its
## contributors may be used to endorse or promote products derived
## from this software without specific prior written permission.
##
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
##
## $QT_END_LICENSE$
##
#############################################################################
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.PositionSemantic, 0, QQuick3DGeometry.Attribute.F32Type
)
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