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29
30 #include "rainfallgraph.h"
31 #include <QtDataVisualization/qcategory3daxis.h>
32 #include <QtDataVisualization/qvalue3daxis.h>
33 #include <QtDataVisualization/q3dscene.h>
34 #include <QtDataVisualization/q3dcamera.h>
35 #include <QtDataVisualization/qbar3dseries.h>
36 #include <QtDataVisualization/q3dtheme.h>
37 #include <QtGui/QGuiApplication>
38 #include <QtGui/QFont>
39 #include <QtCore/QDebug>
40 #include <QtCore/QTextStream>
41 #include <QtCore/QFile>
42
43 using namespace QtDataVisualization;
44
RainfallGraph(Q3DBars * rainfall)45 RainfallGraph::RainfallGraph(Q3DBars *rainfall)
46 : m_graph(rainfall)
47 {
48 // In data file the months are in numeric format, so create custom list
49 for (int i = 1; i <= 12; i++)
50 m_numericMonths << QString::number(i);
51
52 m_columnCount = m_numericMonths.size();
53
54 m_proxy = new VariantBarDataProxy;
55 QBar3DSeries *series = new QBar3DSeries(m_proxy);
56 m_graph->addSeries(series);
57
58 updateYearsList(2000, 2012);
59
60 // Set up bar specifications; make the bars as wide as they are deep,
61 // and add a small space between the bars
62 m_graph->setBarThickness(1.0f);
63 m_graph->setBarSpacing(QSizeF(1.1, 1.1));
64
65 // Set axis labels and titles
66 QStringList months;
67 months << "January" << "February" << "March" << "April" << "May" << "June" << "July" << "August" << "September" << "October" << "November" << "December";
68 m_graph->rowAxis()->setTitle("Year");
69 m_graph->columnAxis()->setTitle("Month");
70 m_graph->valueAxis()->setTitle("rainfall");
71 m_graph->valueAxis()->setLabelFormat("%d mm");
72 m_graph->valueAxis()->setSegmentCount(5);
73 m_graph->rowAxis()->setLabels(m_years);
74 m_graph->columnAxis()->setLabels(months);
75
76 // Set bar type to cylinder
77 series->setMesh(QAbstract3DSeries::MeshCylinder);
78
79 // Set shadows to medium
80 m_graph->setShadowQuality(QAbstract3DGraph::ShadowQualityMedium);
81
82 // Set selection mode to bar and column
83 m_graph->setSelectionMode(QAbstract3DGraph::SelectionItemAndColumn | QAbstract3DGraph::SelectionSlice);
84
85 // Set theme
86 m_graph->activeTheme()->setType(Q3DTheme::ThemeArmyBlue);
87
88 // Override font in theme
89 m_graph->activeTheme()->setFont(QFont("Century Gothic", 30));
90
91 // Override label background for theme
92 m_graph->activeTheme()->setLabelBackgroundEnabled(false);
93
94 // Set camera position and zoom
95 m_graph->scene()->activeCamera()->setCameraPreset(Q3DCamera::CameraPresetIsometricRightHigh);
96
97 // Set window title
98 m_graph->setTitle(QStringLiteral("Monthly rainfall in Northern Finland"));
99
100 // Set reflections on
101 m_graph->setReflection(true);
102 }
103
~RainfallGraph()104 RainfallGraph::~RainfallGraph()
105 {
106 delete m_mapping;
107 delete m_dataSet;
108 delete m_graph;
109 }
110
start()111 void RainfallGraph::start()
112 {
113 addDataSet();
114 }
115
updateYearsList(int start,int end)116 void RainfallGraph::updateYearsList(int start, int end)
117 {
118 m_years.clear();
119 for (int i = start; i <= end; i++)
120 m_years << QString::number(i);
121
122 m_rowCount = m_years.size();
123 }
124
125 //! [0]
addDataSet()126 void RainfallGraph::addDataSet()
127 {
128 // Create a new variant data set and data item list
129 m_dataSet = new VariantDataSet;
130 VariantDataItemList *itemList = new VariantDataItemList;
131
132 // Read data from a data file into the data item list
133 QTextStream stream;
134 QFile dataFile(":/data/raindata.txt");
135 if (dataFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
136 stream.setDevice(&dataFile);
137 while (!stream.atEnd()) {
138 QString line = stream.readLine();
139 if (line.startsWith("#")) // Ignore comments
140 continue;
141 QStringList strList = line.split(",", Qt::SkipEmptyParts);
142 // Each line has three data items: Year, month, and rainfall value
143 if (strList.size() < 3) {
144 qWarning() << "Invalid row read from data:" << line;
145 continue;
146 }
147 // Store year and month as strings, and rainfall value as double
148 // into a variant data item and add the item to the item list.
149 VariantDataItem *newItem = new VariantDataItem;
150 for (int i = 0; i < 2; i++)
151 newItem->append(strList.at(i).trimmed());
152 newItem->append(strList.at(2).trimmed().toDouble());
153 itemList->append(newItem);
154 }
155 } else {
156 qWarning() << "Unable to open data file:" << dataFile.fileName();
157 }
158
159 //! [1]
160 // Add items to the data set and set it to the proxy
161 m_dataSet->addItems(itemList);
162 m_proxy->setDataSet(m_dataSet);
163
164 // Create new mapping for the data and set it to the proxy
165 m_mapping = new VariantBarDataMapping(0, 1, 2, m_years, m_numericMonths);
166 m_proxy->setMapping(m_mapping);
167 //! [1]
168 }
169 //! [0]
170