1 files changed, 57 insertions, 0 deletions
diff --git a/examples/graphs/3d/widgetgallery/topographicseries.py b/examples/graphs/3d/widgetgallery/topographicseries.py
new file mode 100644
index 000000000..4f286a222
--- /dev/null
+++ b/examples/graphs/3d/widgetgallery/topographicseries.py
@@ -0,0 +1,57 @@
+# 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.QtGraphs 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)