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Presenter chart updated
Marek Rosa -
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1 1 /*!
2 2 \example examples/presenterchart
3 3 \title PresenterChart Example
4 4 \subtitle
5 5
6 6 The example shows how to create chart which presents the same set of data as line, scatter, spline and area charts.
7 7 ChartPresenter will switch between these four chart types every few seconds. Note: You can also use the
8 8 QAbstractItemModel related APIs to pass data for the different series types. See the \l {Model data example} for
9 9 more details.
10 10
11 11 \image examples_presenterchart1.png
12 12 \image examples_presenterchart2.png
13 13 \image examples_presenterchart3.png
14 14 \image examples_presenterchart4.png
15 15
16 16 We create simple ChartView class which derives form QChartView.
17 17
18 18 \snippet ../examples/presenterchart/chartview.h 1
19 19
20 20 Class will implement \c handleTimeout() slot which we are going to use to trigger switching between different chart presentations.
21 21 We are also going to provide \c handlePoitClicked() slot which will show clicked point on the chart.
22 22 Class members \c m_series and \c m_titles are going to store series and related titles. In example we are going to present data as a line chart
23 23 using QLineSeries , as scatter chart using QScatterSeries, as a spline chart using QSplineSeries and a area chart using QAreaSeries. We create needed instances in constructor of ChartView class.
24 24
25 25 \snippet ../examples/presenterchart/chartview.cpp 1
26 26
27 27 We add data to three series. Please note area chart is going to use QLineSeries as the upper line. We can use add() member function.
28 28
29 29 \snippet ../examples/presenterchart/chartview.cpp 2
30 30
31 31 In the end we store references all the created series and matching titles.
32 32
33 33 \snippet ../examples/presenterchart/chartview.cpp 3
34 34
35 In \c handleTimeout() slot we change currently displayed chart by removing previous series and adding next series from the \c m_series list. We also set proper title.
35 In \c handleTimeout() slot we change currently displayed chart by removing previous series and adding next series from the \c m_series list. We also set proper title and create the axes for the chart.
36 36
37 37 \snippet ../examples/presenterchart/chartview.cpp 4
38 38 */
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1 1 /****************************************************************************
2 2 **
3 3 ** Copyright (C) 2012 Digia Plc
4 4 ** All rights reserved.
5 5 ** For any questions to Digia, please use contact form at http://qt.digia.com
6 6 **
7 7 ** This file is part of the Qt Commercial Charts Add-on.
8 8 **
9 9 ** $QT_BEGIN_LICENSE$
10 10 ** Licensees holding valid Qt Commercial licenses may use this file in
11 11 ** accordance with the Qt Commercial License Agreement provided with the
12 12 ** Software or, alternatively, in accordance with the terms contained in
13 13 ** a written agreement between you and Digia.
14 14 **
15 15 ** If you have questions regarding the use of this file, please use
16 16 ** contact form at http://qt.digia.com
17 17 ** $QT_END_LICENSE$
18 18 **
19 19 ****************************************************************************/
20 20
21 21 #include "chartview.h"
22 22 #include <QLineSeries>
23 23 #include <QScatterSeries>
24 24 #include <QSplineSeries>
25 25 #include <QAreaSeries>
26 26 #include <QTime>
27 27
28 ChartView::ChartView(QChart* chart,QWidget* parent):QChartView(chart,parent),
29 m_index(-1),m_chart(chart)
28 ChartView::ChartView(QChart* chart,QWidget* parent):
29 QChartView(chart,parent),
30 m_index(-1),
31 m_chart(chart)
30 32 {
31 33 m_chart->setTitle("Charts presenter");
32 34 m_chart->setDropShadowEnabled(false);
33 35 QObject::connect(&m_timer,SIGNAL(timeout()),this,SLOT(handleTimeout()));
34 36 m_timer.setInterval(3000);
35 37
36 //![1]
38 //![1]
37 39 QLineSeries* series0 = new QLineSeries();
38 40 series0->setName("line");
39 41
40 42 QScatterSeries* series1 = new QScatterSeries();
41 43 series1->setName("scatter");
42 44
43 45 QSplineSeries* series2 = new QSplineSeries();
44 46 series2->setName("spline");
45 47
46 48 QAreaSeries* series3 = new QAreaSeries(series0);
47 49 series3->setName("area");
48 //![1]
50 //![1]
49 51
50 //![2]
52 //![2]
51 53 int numPoints = 10;
52 54
53 55 for (int x = 0; x <= numPoints; ++x) {
54 56 qreal y = qrand() % 100;
55 57 series0->append(x,y);
56 58 series1->append(x,y);
57 59 series2->append(x,y);
58 60 }
59 //![2]
61 //![2]
60 62
61 //![3]
63 //![3]
62 64 m_series<<series0;
63 65 m_titles<< m_chart->title()+": LineChart";
64 66 m_series<<series1;
65 67 m_titles<< m_chart->title()+": ScatterChart";
66 68 m_series<<series2;
67 69 m_titles<< m_chart->title()+": SplineChart";
68 70 m_series<<series3;
69 71 m_titles<< m_chart->title()+": AreaChart";
70 //![3]
72 //![3]
71 73
72 74 m_timer.start();
73 75 handleTimeout();
74 76 }
75 77
76 78 ChartView::~ChartView()
77 79 {
78 if(m_series.size()==0) return;
80 if(m_series.size() == 0) return;
79 81 m_chart->removeSeries(m_series.at(m_index));
80 82 m_series.removeLast(); //remove QAreaSeries instance since they will be deleted when QLineSeries instance is gone
81 83 qDeleteAll(m_series);
82 84 }
83 85
84 86 //![4]
85 87 void ChartView::handleTimeout()
86 88 {
87 if(m_series.size()==0) return;
88 if(m_index>=0)
89 m_chart->removeSeries(m_series.at(m_index));
89 if(m_series.size() == 0) return;
90 if(m_index >= 0)
91 m_chart->removeSeries(m_series.at(m_index));
90 92 m_index++;
91 m_index=m_index%m_series.size();
93 m_index = m_index % m_series.size();
92 94 m_chart->addSeries(m_series.at(m_index));
93 95 m_chart->setTitle(m_titles.at(m_index));
96 m_chart->createDefaultAxes();
94 97 }
95 98 //![4]
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