| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the Qt Data Visualization module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:GPL$ |
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| |
| #include "topographicseries.h" |
| |
| using namespace QtDataVisualization; |
| |
| //! [0] |
| // Value used to encode height data as RGB value on PNG file |
| const float packingFactor = 11983.0f; |
| //! [0] |
| |
| TopographicSeries::TopographicSeries() |
| { |
| setDrawMode(QSurface3DSeries::DrawSurface); |
| setFlatShadingEnabled(true); |
| setBaseColor(Qt::white); |
| } |
| |
| TopographicSeries::~TopographicSeries() |
| { |
| } |
| |
| void TopographicSeries::setTopographyFile(const QString file, float width, float height) |
| { |
| //! [1] |
| QImage heightMapImage(file); |
| uchar *bits = heightMapImage.bits(); |
| int imageHeight = heightMapImage.height(); |
| int imageWidth = heightMapImage.width(); |
| int widthBits = imageWidth * 4; |
| float stepX = width / float(imageWidth); |
| float stepZ = height / float(imageHeight); |
| |
| QSurfaceDataArray *dataArray = new QSurfaceDataArray; |
| dataArray->reserve(imageHeight); |
| for (int i = 0; i < imageHeight; i++) { |
| int p = i * widthBits; |
| float z = height - float(i) * stepZ; |
| QSurfaceDataRow *newRow = new QSurfaceDataRow(imageWidth); |
| for (int j = 0; j < imageWidth; j++) { |
| uchar aa = bits[p + 0]; |
| uchar rr = bits[p + 1]; |
| uchar gg = bits[p + 2]; |
| uint color = uint((gg << 16) + (rr << 8) + aa); |
| float y = float(color) / packingFactor; |
| (*newRow)[j].setPosition(QVector3D(float(j) * stepX, y, z)); |
| p = p + 4; |
| } |
| *dataArray << newRow; |
| } |
| |
| dataProxy()->resetArray(dataArray); |
| //! [1] |
| |
| m_sampleCountX = float(imageWidth); |
| m_sampleCountZ = float(imageHeight); |
| } |