|
|
/*!
|
|
|
\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.
|
|
|
|
|
|
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
|
|
|
|
|
|
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
|
|
|
*/
|
|
|
|
