examples-presenterchart.qdoc
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r482 | /*! | |
Tero Ahola
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r500 | \example examples/presenterchart | |
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r482 | \title PresenterChart Example | |
\subtitle | |||
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r574 | The example shows how to create chart which presents the same set of data as line, scatter, spline and area charts. | |
ChartPresenter will switch between these four chart types every few seconds. | |||
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r482 | Please note this example does not use common data model. A use of common data model is documented here.[TODO] | |
\image presenterchart1.png | |||
\image presenterchart2.png | |||
\image presenterchart3.png | |||
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r574 | \image presenterchart4.png | |
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r482 | ||
We create simple ChartView class which derives form QChartView. | |||
sauimone
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r496 | \snippet ../examples/presenterchart/chartview.h 1 | |
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r482 | ||
Class will implement \c handleTimeout() slot which we are going to use to trigger switching between different chart presentations. | |||
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r574 | We are also going to provide \c handlePoitClicked() slot which will show clicked point on the chart. | |
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r482 | 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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r574 | 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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r482 | We set custom line and points colors. | |
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r496 | \snippet ../examples/presenterchart/chartview.cpp 1 | |
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r482 | ||
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r574 | 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, | |
it is wiser to use shared data model, as described here.[TODO] | |||
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sauimone
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r496 | \snippet ../examples/presenterchart/chartview.cpp 2 | |
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In the end we store references all the created series and matching titles. | |||
sauimone
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r496 | \snippet ../examples/presenterchart/chartview.cpp 3 | |
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r574 | We connect \c clicked() signals from each series with our \c handlePointClciked() slot. | |
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sauimone
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r496 | \snippet ../examples/presenterchart/chartview.cpp 4 | |
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r482 | ||
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r574 | 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. | |
\snippet ../examples/presenterchart/chartview.cpp 5 | |||
In \c handlePointClciked() slot we set the chart's title to show clicked point x and y coordinates. | |||
\snippet ../examples/presenterchart/chartview.cpp 6 | |||
Michal Klocek
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r482 | */ |