summaryrefslogtreecommitdiffstats
path: root/examples/datavisualization/texturesurface/topographicseries.cpp
blob: 7331e211130160d722fc156d373af97824898604 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd
** All rights reserved.
** For any questions to The Qt Company, please use contact form at http://qt.io
**
** This file is part of the Qt Data Visualization module.
**
** Licensees holding valid commercial license for Qt may use this file in
** accordance with the Qt License Agreement provided with the Software
** or, alternatively, in accordance with the terms contained in a written
** agreement between you and The Qt Company.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.io
**
****************************************************************************/

#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);
}