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# Copyright (C) 2023 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from PySide6.QtCore import Qt
from PySide6.QtGui import QImage, QVector3D
from PySide6.QtDataVisualization import (QSurface3DSeries, QSurfaceDataItem)
# Value used to encode height data as RGB value on PNG file
PACKING_FACTOR = 11983.0
class TopographicSeries(QSurface3DSeries):
def __init__(self):
super().__init__()
self._sampleCountX = 0.0
self._sampleCountZ = 0.0
self.setDrawMode(QSurface3DSeries.DrawSurface)
self.setFlatShadingEnabled(True)
self.setBaseColor(Qt.white)
def sampleCountX(self):
return self._sampleCountX
def sampleCountZ(self):
return self._sampleCountZ
def setTopographyFile(self, file, width, height):
heightMapImage = QImage(file)
bits = heightMapImage.bits()
imageHeight = heightMapImage.height()
imageWidth = heightMapImage.width()
widthBits = imageWidth * 4
stepX = width / float(imageWidth)
stepZ = height / float(imageHeight)
dataArray = []
for i in range(0, imageHeight):
p = i * widthBits
z = height - float(i) * stepZ
newRow = []
for j in range(0, imageWidth):
aa = bits[p + 0]
rr = bits[p + 1]
gg = bits[p + 2]
color = (gg << 16) + (rr << 8) + aa
y = float(color) / PACKING_FACTOR
item = QSurfaceDataItem(QVector3D(float(j) * stepX, y, z))
newRow.append(item)
p += 4
dataArray.append(newRow)
self.dataProxy().resetArray(dataArray)
self._sampleCountX = float(imageWidth)
self._sampleCountZ = float(imageHeight)
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