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29 | |
30 | #include "topographicseries.h" |
31 | |
32 | using namespace QtDataVisualization; |
33 | |
34 | //! [0] |
35 | // Value used to encode height data as RGB value on PNG file |
36 | const float packingFactor = 11983.0f; |
37 | //! [0] |
38 | |
39 | TopographicSeries::TopographicSeries() |
40 | { |
41 | setDrawMode(QSurface3DSeries::DrawSurface); |
42 | setFlatShadingEnabled(true); |
43 | setBaseColor(Qt::white); |
44 | } |
45 | |
46 | TopographicSeries::~TopographicSeries() |
47 | { |
48 | } |
49 | |
50 | void TopographicSeries::setTopographyFile(const QString file, float width, float height) |
51 | { |
52 | //! [1] |
53 | QImage heightMapImage(file); |
54 | uchar *bits = heightMapImage.bits(); |
55 | int imageHeight = heightMapImage.height(); |
56 | int imageWidth = heightMapImage.width(); |
57 | int widthBits = imageWidth * 4; |
58 | float stepX = width / float(imageWidth); |
59 | float stepZ = height / float(imageHeight); |
60 | |
61 | QSurfaceDataArray *dataArray = new QSurfaceDataArray; |
62 | dataArray->reserve(alloc: imageHeight); |
63 | for (int i = 0; i < imageHeight; i++) { |
64 | int p = i * widthBits; |
65 | float z = height - float(i) * stepZ; |
66 | QSurfaceDataRow *newRow = new QSurfaceDataRow(imageWidth); |
67 | for (int j = 0; j < imageWidth; j++) { |
68 | uchar aa = bits[p + 0]; |
69 | uchar rr = bits[p + 1]; |
70 | uchar gg = bits[p + 2]; |
71 | uint color = uint((gg << 16) + (rr << 8) + aa); |
72 | float y = float(color) / packingFactor; |
73 | (*newRow)[j].setPosition(QVector3D(float(j) * stepX, y, z)); |
74 | p = p + 4; |
75 | } |
76 | *dataArray << newRow; |
77 | } |
78 | |
79 | dataProxy()->resetArray(newArray: dataArray); |
80 | //! [1] |
81 | |
82 | m_sampleCountX = float(imageWidth); |
83 | m_sampleCountZ = float(imageHeight); |
84 | } |
85 |