demos-qmloscilloscope.qdoc
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Tero Ahola
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r1825 | /*! | ||
| \example demos/qmloscilloscope | ||||
| \title Oscilloscope | ||||
| \image demos_qmloscilloscope.png | ||||
| Oscilloscope application demonstrates how to use QtCommercial Charts QML api to implement an | ||||
| application with strict performance requirements. The application uses generated data with | ||||
| configurable characteristics to mimic a simple oscilloscope user interface. To find out the | ||||
| actual screen refresh performance of the application, you can set QML_SHOW_FRAMERATE = 1 to | ||||
| your run environment settings to get the framerate shown in the application output console. | ||||
| I.e. go to Projects - Run - Run environment in Qt Creator and select Add. Then you can | ||||
| experiment with the different configurable options of the demo application to find the | ||||
| configuration that gives you the best performance in your environment. | ||||
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Tero Ahola
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r2267 | Note: You can try if enabling OpenGL improves the performance with the following startup | ||
| parameter: | ||||
| \code | ||||
| -graphicssystem opengl | ||||
| \endcode | ||||
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Tero Ahola
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r1825 | The application window is shared by control and scope views: | ||
| \snippet ../demos/qmloscilloscope/qml/qmloscilloscope/main.qml 1 | ||||
| \snippet ../demos/qmloscilloscope/qml/qmloscilloscope/main.qml 2 | ||||
| ControlView implements the buttons used for configuring. ScopeView uses a ChartView to show | ||||
| a chart with two line series: | ||||
| \snippet ../demos/qmloscilloscope/qml/qmloscilloscope/ScopeView.qml 1 | ||||
| The data of the line series is updated with a QML timer. In a real life application the | ||||
| updating could triggered with a signal from Qt C++ code. | ||||
| \snippet ../demos/qmloscilloscope/qml/qmloscilloscope/ScopeView.qml 2 | ||||
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Tero Ahola
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r1960 | |||
| The oscilloscope also allows you to switch the type of the series used for visualizing the | ||||
| signal sources. This is implemented by dynamically destroying and creating series: | ||||
| \snippet ../demos/qmloscilloscope/qml/qmloscilloscope/ScopeView.qml 3 | ||||
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Tero Ahola
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r1825 | */ | ||