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# Sample Code

All sample codes can be downloaded as a zip file: silx_examples.zip.

## `silx.gui` sample code

### `silx.gui.icons`

Source | Screenshot | Description
--- | --- | ---
`icons.py` |  | Display icons and animated icons provided by silx.

### `silx.gui.data` and `silx.gui.hdf5`

Source | Screenshot | Description
--- | --- | ---
`customHdf5TreeModel.py` |  | Qt Hdf5 widget examples
`customDataView.py` |  | Qt data view example
`hdf5widget.py` |  | Qt Hdf5 widget examples

### `silx.gui.dialog`

Source | Screenshot | Description
--- | --- | ---
`fileDialog.py` |  | Example for the use of the ImageFileDialog.
`colormapDialog.py` |  | This script shows the features of a `ColormapDialog`.

### `silx.gui.widgets`

Source | Screenshot | Description
--- | --- | ---
`periodicTable.py` |  | This script is a simple example of how to use the periodic table widgets, select elements and connect signals.

`simplewidget.py`

This script shows a gallery of simple widgets provided by silx.

It shows the following widgets:

- `WaitingPushButton`: A button with a progress-like waiting animated icon.

## `silx.gui.plot` sample code

### Widgets

Source | Screenshot | Description
--- | --- | ---
`imageview.py` |  | Example to show the use of `ImageView` widget. It can be used to open an EDF or TIFF file from the shell command line. To view an image file with the current installed silx library: `python examples/imageview.py <file to open>` To get help: `python examples/imageview.py -h`
`stackView.py` |  | This script is a simple example to illustrate how to use the `StackView` widget.
`scatterview.py` |  | Example to show the use of `ScatterView` widget

`compareImages.py`

usage: compareImages.py [-h] [–debug] [–testdata] [–use-opengl-plot]

  [files [files …]]

Example demonstrating the use of the widget CompareImages

positional arguments:
  files Image data to compare (HDF5 file with path, EDF files,

    JPEG/PNG image files). Data from HDF5 files can be accessed using dataset path and slicing as an URL: silx:../my_file.h5?path=/entry/data&slice=10 EDF file frames also can can be accessed using URL: fabio:../my_file.edf?slice=10 Using URL in command like usually have to be quoted: “URL”.

optional arguments:
  `-h, --help`

    show this help message and exit

  `--debug`

    Set logging system in debug mode

  `--testdata`

    Use synthetic images to test the application

  `--use-opengl-plot`

    Use OpenGL for plots (instead of matplotlib)

`imageStack.py` |  | Simple example for using the ImageStack. In this example we want to display images from different source: .h5, .edf and .npy files. To do so we simple reimplement the thread managing the loading of data.

### `silx.gui.plot.actions.PlotAction`

Sample code that adds buttons to the toolbar of a silx plot widget.

Source | Screenshot | Description
--- | --- | ---
`plotClearAction.py` |  | This script shows how to create a minimalistic `PlotAction` that clear the plot. This illustrates how to add more buttons in a plot widget toolbar.
`shiftPlotAction.py` |  | This script is a simple (trivial) example of how to create a `PlotWindow`, create a custom `PlotAction` and add it to the toolbar. The action simply shifts the selected curve up by 1 unit by adding 1 to each value of y.

`fftPlotAction.py`, `fft.png`

This script is a simple example of how to create a `PlotWindow` with a custom `PlotAction` added to the toolbar.

The action computes the FFT of all curves and plots their amplitude spectrum. It also performs the reverse transform.

This example illustrates:

  - how to create a checkable action

  - how to store user info with a curve in a PlotWindow

  - how to modify the graph title and axes labels

  - how to add your own icon as a PNG file

See shiftPlotAction.py for a simpler example with more basic comments.

### Add features to `PlotWidget`

Sample code that adds specific tools or functions to `PlotWidget`.

Source | Screenshot | Description
--- | --- | ---

`plotWidget.py`

This script shows how to create a custom window around a PlotWidget.

It subclasses `QMainWindow`, uses a `PlotWidget` as its central widget and adds toolbars and a colorbar by using pluggable widgets:

- `PlotWidget` from `silx.gui.plot`

- QToolBar from `silx.gui.plot.tools`

- QAction from `silx.gui.plot.actions`

- QToolButton from `silx.gui.plot.PlotToolButtons`

- `silx.gui.plot.ColorBar.ColorBarWidget`

`plotItemsSelector.py` |  | This example illustrates how to use a `ItemsSelectionDialog` widget associated with a `PlotWidget`
`plotInteractiveImageROI.py` |  | This script illustrates image ROI selection in a `PlotWidget` It uses `RegionOfInterestManager` and `RegionOfInterestTableWidget` to handle the interactive selection and to display the list of selected ROIs.
`printPreview.py` |  | This script illustrates how to add a print preview tool button to any plot widget inheriting `PlotWidget`. Three plot widgets are instantiated. One of them uses a standalone `PrintPreviewToolButton`, while the other two use a `SingletonPrintPreviewToolButton` which allows them to send their content to the same print preview page.
`scatterMask.py` |  | This example demonstrates how to use ScatterMaskToolsWidget and NamedScatterAlphaSlider with a PlotWidget.
`plotCurveLegendWidget.py` |  | This example illustrates the use of `CurveLegendsWidget`. `CurveLegendsWidget` display curves style and legend currently visible in a `PlotWidget`

`plotStats.py`

This script is a simple example of how to add your own statistic to a `StatsWidget` from customs `Stats` and display it.

On this example we will:

> - show sum of values for each type

> - compute curve integrals (only for ‘curve’).

> - compute center of mass for all possible items

Note

for now the possible types manged by the Stats are (‘curve’, ‘image’, ‘scatter’ and ‘histogram’)

`plotROIStats.py` |  | This script is a simple example of how to display statistics on a specific region of interest. An example on how to define your own statistic is given in the ‘plotStats.py’ script.
`plotProfile.py` |  | Example illustrating the different profile tools.

### `PlotWidget` features

Sample code that illustrates some functionalities of `PlotWidget`.

Source | Screenshot | Description
--- | --- | ---

`plotContextMenu.py`

This script illustrates the addition of a context menu to a `PlotWidget`.

This is done by adding a custom context menu to the plot area of PlotWidget: - set the context menu policy of the plot area to Qt.CustomContextMenu. - connect to the plot area customContextMenuRequested signal.

The same method works with `PlotWindow`, `Plot1D` and `Plot2D` widgets as they inherit from `PlotWidget`.

For more information on context menus, see Qt documentation.

`plotLimits.py` |  | This script is an example to illustrate how to use axis synchronization tool.

`plotUpdateCurveFromThread.py`

This script illustrates the update of a `silx.gui.plot` widget from a thread.

The problem is that plot and GUI methods should be called from the main thread. To safely update the plot from another thread, one need to execute the update asynchronously in the main thread. In this example, this is achieved with `submitToQtMainThread()`.

In this example a thread calls submitToQtMainThread to update the curve of a plot.

`plotUpdateImageFromGevent.py` |  | This script illustrates the update of a `Plot2D` widget from a gevent coroutine.

`plotUpdateImageFromThread.py`

This script illustrates the update of a `silx.gui.plot` widget from a thread.

The problem is that plot and GUI methods should be called from the main thread. To safely update the plot from another thread, one need to execute the update asynchronously in the main thread. In this example, this is achieved with `submitToQtMainThread()`.

In this example a thread calls submitToQtMainThread to update the curve of a plot.

`syncaxis.py` |  | This script is an example to illustrate how to use axis synchronization tool.
`dropZones.py` |  | Example of drop zone supporting application/x-silx-uri. This example illustrates the support of drag&drop of silx URLs. It provides 2 URLs (corresponding to 2 datasets) that can be dragged to either a `PlotWidget` or a QLable displaying the URL information.
`exampleBaseline.py` |  | This example illustrates some usage possible with the baseline parameter
`syncPlotLocation.py` |  | This script is an example to illustrate how to use axis synchronization tool.
`compareBackends.py` |  | This script compares the rendering of PlotWidget’s matplotlib and OpenGL backends.

## `silx.gui.plot3d` sample code

Source | Screenshot | Description
--- | --- | ---

`plot3dSceneWindow.py`

This script displays the different items of `SceneWindow`.

It shows the different visualizations of `SceneWindow` and `SceneWidget`. It illustrates the API to set those items.

It features:

- 2D images: data and RGBA images

- 2D scatter data, displayed either as markers, wireframe or surface.

- 3D scatter plot

- 3D scalar field with iso-surface and cutting plane.

- A clipping plane.

`plot3dUpdateScatterFromThread.py`

This script illustrates the update of a `SceneWindow` widget from a thread.

The problem is that GUI methods should be called from the main thread. To safely update the scene from another thread, one need to execute the update asynchronously in the main thread. In this example, this is achieved with `submitToQtMainThread()`.

In this example a thread calls submitToQtMainThread to append data to a 3D scatter.

`plot3dContextMenu.py`

This script adds a context menu to a `silx.gui.plot3d.ScalarFieldView`.

This is done by adding a custom context menu to the `Plot3DWidget`:

- set the context menu policy to Qt.CustomContextMenu.

- connect to the customContextMenuRequested signal.

For more information on context menus, see Qt documentation.

`viewer3DVolume.py` |  | This script illustrates the use of `silx.gui.plot3d.ScalarFieldView`. It loads a 3D scalar data set from a file and displays iso-surfaces and an interactive cutting plane. It can also be started without providing a file.

## `silx.gui.widgets` sample code

Source | Screenshot | Description
--- | --- | ---
`floatedit.py` |  | This script illustrates the use of `silx.gui.widgets.FloatEdit.FloatEdit`.
`stackedprogressbar.py` |  | This script illustrates the use of `silx.gui.widgets.StackedProgressBar.StackedProgressBar`.
`waiterOverlay.py` |  | Demonstration window that displays a wait icon until the plot is updated.

## `silx.io` sample code

Source | Screenshot | Description
--- | --- | ---
`writetoh5.py` |  | This script is an example of how to use the `silx.io.convert` module. See the following tutorial for more information: Converting various data files to HDF5

## `silx.image` sample code

Source | Screenshot | Description
--- | --- | ---
`findContours.py` |  | Find contours examples Note This module has an optional dependency with sci-kit image library. You might need to install it if you don’t already have it.

## `silx.app` sample code

Source | Screenshot | Description
--- | --- | ---
`customSilxView.py` |  | Sample code illustrating how to custom silx view into another application.