mirror of https://github.com/qt/qtgraphs.git
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
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// Copyright (C) 2023 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
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#include "topographicseries.h"
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//! [0]
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// Value used to encode height data as RGB value on PNG file
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const float packingFactor = 11983.f;
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//! [0]
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TopographicSeries::TopographicSeries()
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{
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setDrawMode(QSurface3DSeries::DrawSurface);
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setFlatShadingEnabled(true);
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setBaseColor(Qt::white);
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}
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TopographicSeries::~TopographicSeries() = default;
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void TopographicSeries::setTopographyFile(const QString file, float width, float height)
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{
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//! [1]
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QImage heightMapImage(file);
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uchar *bits = heightMapImage.bits();
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int imageHeight = heightMapImage.height();
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int imageWidth = heightMapImage.width();
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int widthBits = imageWidth * 4;
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float stepX = width / float(imageWidth);
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float stepZ = height / float(imageHeight);
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QSurfaceDataArray *dataArray = new QSurfaceDataArray;
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dataArray->reserve(imageHeight);
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for (int i = 0; i < imageHeight; i++) {
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int p = i * widthBits;
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float z = height - float(i) * stepZ;
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QSurfaceDataRow *newRow = new QSurfaceDataRow(imageWidth);
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for (int j = 0; j < imageWidth; j++) {
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uchar aa = bits[p + 0];
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uchar rr = bits[p + 1];
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uchar gg = bits[p + 2];
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uint color = uint((gg << 16) + (rr << 8) + aa);
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float y = float(color) / packingFactor;
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(*newRow)[j].setPosition(QVector3D(float(j) * stepX, y, z));
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p = p + 4;
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}
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*dataArray << newRow;
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}
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dataProxy()->resetArray(dataArray);
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//! [1]
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m_sampleCountX = float(imageWidth);
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m_sampleCountZ = float(imageHeight);
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}
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