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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
import numpy as np
from PySide6.QtCore import Property, Signal
from PySide6.QtGui import QVector3D
from PySide6.QtQml import QmlElement
from PySide6.QtQuick3D import QQuick3DGeometry
QML_IMPORT_NAME = "ExampleTriangleGeometry"
QML_IMPORT_MAJOR_VERSION = 1
@QmlElement
class ExampleTriangleGeometry(QQuick3DGeometry):
normalsChanged = Signal()
normalXYChanged = Signal()
uvChanged = Signal()
uvAdjustChanged = Signal()
def __init__(self, parent=None):
QQuick3DGeometry.__init__(self, parent)
self._hasNormals = False
self._normalXY = 0.0
self._hasUV = False
self._uvAdjust = 0.0
self.updateData()
@Property(bool, notify=normalsChanged)
def normals(self):
return self._hasNormals
@normals.setter
def normals(self, enable):
if self._hasNormals == enable:
return
self._hasNormals = enable
self.normalsChanged.emit()
self.updateData()
self.update()
@Property(float, notify=normalXYChanged)
def normalXY(self):
return self._normalXY
@normalXY.setter
def normalXY(self, xy):
if self._normalXY == xy:
return
self._normalXY = xy
self.normalXYChanged.emit()
self.updateData()
self.update()
@Property(bool, notify=uvChanged)
def uv(self):
return self._hasUV
@uv.setter
def uv(self, enable):
if self._hasUV == enable:
return
self._hasUV = enable
self.uvChanged.emit()
self.updateData()
self.update()
@Property(float, notify=uvAdjustChanged)
def uvAdjust(self):
return self._uvAdjust
@uvAdjust.setter
def uvAdjust(self, f):
if self._uvAdjust == f:
return
self._uvAdjust = f
self.uvAdjustChanged.emit()
self.updateData()
self.update()
def updateData(self):
self.clear()
stride = 3
if self._hasNormals:
stride += 3
if self._hasUV:
stride += 2
# 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
vertexData = np.zeros(3 * stride, dtype=np.float32)
# a triangle, front face = counter-clockwise
p = 0
vertexData[p] = -1.0
p += 1
vertexData[p] = -1.0
p += 1
vertexData[p] = 0.0
p += 1
if self._hasNormals:
vertexData[p] = self._normalXY
p += 1
vertexData[p] = self._normalXY
p += 1
vertexData[p] = 1.0
p += 1
if self._hasUV:
vertexData[p] = 0.0 + self._uvAdjust
p += 1
vertexData[p] = 0.0 + self._uvAdjust
p += 1
vertexData[p] = 1.0
p += 1
vertexData[p] = -1.0
p += 1
vertexData[p] = 0.0
p += 1
if self._hasNormals:
vertexData[p] = self._normalXY
p += 1
vertexData[p] = self._normalXY
p += 1
vertexData[p] = 1.0
p += 1
if self._hasUV:
vertexData[p] = 1.0 - self._uvAdjust
p += 1
vertexData[p] = 0.0 + self._uvAdjust
p += 1
vertexData[p] = 0.0
p += 1
vertexData[p] = 1.0
p += 1
vertexData[p] = 0.0
p += 1
if self._hasNormals:
vertexData[p] = self._normalXY
p += 1
vertexData[p] = self._normalXY
p += 1
vertexData[p] = 1.0
p += 1
if self._hasUV:
vertexData[p] = 1.0 - self._uvAdjust
p += 1
vertexData[p] = 1.0 - self._uvAdjust
p += 1
self.setVertexData(vertexData.tobytes())
self.setStride(stride * FLOAT_SIZE)
self.setBounds(QVector3D(-1.0, -1.0, 0.0), QVector3D(+1.0, +1.0, 0.0))
self.setPrimitiveType(QQuick3DGeometry.PrimitiveType.Triangles)
self.addAttribute(
QQuick3DGeometry.Attribute.PositionSemantic, 0, QQuick3DGeometry.Attribute.F32Type
)
if self._hasNormals:
self.addAttribute(
QQuick3DGeometry.Attribute.NormalSemantic,
3 * FLOAT_SIZE,
QQuick3DGeometry.Attribute.F32Type,
)
if self._hasUV:
self.addAttribute(
QQuick3DGeometry.Attribute.TexCoordSemantic,
6 * FLOAT_SIZE if self._hasNormals else 3 * FLOAT_SIZE,
QQuick3DGeometry.Attribute.F32Type,
)
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