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3 | 3 | \title PresenterChart Example |
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4 | 4 | \subtitle |
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5 | 5 | |
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6 |
The example shows how to create chart which presents the same set of data as line, scatter |
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7 |
ChartPresenter will switch between these |
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6 | The example shows how to create chart which presents the same set of data as line, scatter, spline and area charts. | |
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7 | ChartPresenter will switch between these four chart types every few seconds. | |
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8 | 8 | Please note this example does not use common data model. A use of common data model is documented here.[TODO] |
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9 | 9 | |
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10 | 10 | \image presenterchart1.png |
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11 | 11 | \image presenterchart2.png |
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12 | 12 | \image presenterchart3.png |
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13 | \image presenterchart4.png | |
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13 | 14 | |
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14 | 15 | We create simple ChartView class which derives form QChartView. |
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15 | 16 | |
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16 | 17 | \snippet ../examples/presenterchart/chartview.h 1 |
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17 | 18 | |
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18 | 19 | Class will implement \c handleTimeout() slot which we are going to use to trigger switching between different chart presentations. |
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20 | We are also going to provide \c handlePoitClicked() slot which will show clicked point on the chart. | |
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19 | 21 | 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 |
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20 |
using QLineSeries , as scatter chart using QScatterSeries, a |
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22 | 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. | |
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21 | 23 | We set custom line and points colors. |
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22 | 24 | |
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23 | 25 | \snippet ../examples/presenterchart/chartview.cpp 1 |
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24 | 26 | |
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25 | We add data to all three series. We can use add() member function. If data set is large,it is wiser to use shared data model, as described here.[TODO] | |
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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. If data set is large, | |
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28 | it is wiser to use shared data model, as described here.[TODO] | |
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26 | 29 | |
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27 | 30 | \snippet ../examples/presenterchart/chartview.cpp 2 |
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28 | 31 | |
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30 | 33 | |
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31 | 34 | \snippet ../examples/presenterchart/chartview.cpp 3 |
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32 | 35 | |
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33 | 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. | |
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36 | We connect \c clicked() signals from each series with our \c handlePointClciked() slot. | |
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34 | 37 | |
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35 | 38 | \snippet ../examples/presenterchart/chartview.cpp 4 |
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36 | 39 | |
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40 | 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. | |
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41 | ||
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42 | \snippet ../examples/presenterchart/chartview.cpp 5 | |
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43 | ||
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44 | In \c handlePointClciked() slot we set the chart's title to show clicked point x and y coordinates. | |
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45 | ||
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46 | \snippet ../examples/presenterchart/chartview.cpp 6 | |
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47 | ||
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37 | 48 | */ No newline at end of file |
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64 | 64 | addSeries(series0); |
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65 | 65 | setChartTitle(m_titles.at(0)); |
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66 | 66 | |
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67 | //![4] | |
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67 | 68 | foreach (QSeries* series, m_series) { |
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68 | 69 | QObject::connect(series,SIGNAL(clicked(const QPointF&)),this,SLOT(handlePointClicked(const QPointF&))); |
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69 | 70 | } |
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71 | //![4] | |
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70 | 72 | |
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71 | 73 | m_timer.start(); |
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72 | 74 | } |
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78 | 80 | qDeleteAll(m_series); |
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79 | 81 | } |
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80 | 82 | |
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81 |
//![ |
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83 | //![5] | |
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82 | 84 | void ChartView::handleTimeout() |
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83 | 85 | { |
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84 | 86 | if(m_series.size()==0) return; |
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88 | 90 | addSeries(m_series.at(m_index)); |
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89 | 91 | setChartTitle(m_titles.at(m_index)); |
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90 | 92 | } |
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91 |
//![ |
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93 | //![5] | |
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92 | 94 | |
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95 | //![6] | |
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93 | 96 | void ChartView::handlePointClicked(const QPointF& point) |
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94 | 97 | { |
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95 | 98 | setChartTitle(m_titles.at(m_index) + QString(" x: %1 y: %2").arg(point.x()).arg(point.y())); |
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96 | 99 | } |
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100 | //![6] | |
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64 | 64 | */ |
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65 | 65 | |
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66 | 66 | /*! |
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67 | \fn void QAreaSeries::clicked(const QPointF& point) | |
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68 | \brief Signal is emitted when user clicks the \a point on area chart. | |
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69 | */ | |
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70 | ||
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71 | /*! | |
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67 | 72 | \fn void QAreaSeries::updated() |
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68 | 73 | \brief \internal |
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69 | 74 | */ |
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37 | 37 | \sa QSeries, QSeriesType |
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38 | 38 | */ |
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39 | 39 | |
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40 | /*! | |
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41 | \fn void QScatterSeries::clicked(const QPointF& point) | |
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42 | \brief Signal is emitted when user clicks the \a point on scatter chart. | |
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43 | */ | |
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44 | ||
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45 | 40 | QTCOMMERCIALCHART_BEGIN_NAMESPACE |
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46 | 41 | |
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47 | 42 | /*! |
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20 | 20 | */ |
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21 | 21 | |
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22 | 22 | /*! |
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23 | \fn void QXYSeries::clicked(const QPointF& point) | |
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24 | \brief Signal is emitted when user clicks the \a point on chart. | |
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25 | */ | |
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26 | ||
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27 | /*! | |
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23 | 28 | \fn void QXYSeries::pointReplaced(int index) |
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24 | 29 | \brief \internal \a index |
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25 | 30 | */ |
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