DataViewer: Widget to display any kind of data

This module defines a widget designed to display data using the most adapted view from the ones provided by silx.

class DataViewer(parent=None)

Widget to display any kind of data

The method setData() allows to set any data to the widget. Mostly numpy.array and h5py.Dataset are supported with adapted views. Other data types are displayed using a text viewer.

A default view is automatically selected when a data is set. The method setDisplayMode() allows to change the view. To have a graphical tool to select the view, prefer using the widget DataViewerFrame.

The dimension of the input data and the expected dimension of the selected view can differ. For example you can display an image (2D) from 4D data. In this case a NumpyAxesSelector is displayed to allow the user to select the axis mapping and the slicing of other axes.

import numpy
data = numpy.random.rand(500,500)
viewer = DataViewer()
viewer.setData(data)
viewer.setVisible(True)

displayedViewChanged

Emitted when the displayed view changes

dataChanged

Emitted when the data changes

selectionChanged

Emitted when the data selection changes.

It provides: - the slicing as a tuple of slice or None. - the permutation as a tuple of int or None.

currentAvailableViewsChanged

Emitted when the current available views (which support the current data) change

setGlobalHooks(hooks)

Set a data view hooks for all the views

Parameters

context (DataViewHooks) – The hooks to use

createDefaultViews(parent=None)

Create and returns available views which can be displayed by default by the data viewer. It is called internally by the widget. It can be overwriten to provide a different set of viewers.

Parameters

parent (QWidget) – QWidget parent of the views

Return type

List[silx.gui.data.DataViews.DataView]

clear()

Clear the widget

normalizeData(data)

Returns a normalized data if the embed a numpy or a dataset. Else returns the data.

setDisplayedView(view)

Set the displayed view.

Change the displayed view according to the view itself.

Parameters

view (silx.gui.data.DataViews.DataView) – The DataView to use to display the data

getViewFromModeId(modeId)

Returns the first available view which have the requested modeId. Return None if modeId does not correspond to an existing view.

Parameters

modeId (int) – Requested mode id

Return type

silx.gui.data.DataViews.DataView

setDisplayMode(modeId)

Set the displayed view using display mode.

Change the displayed view according to the requested mode.

Parameters

modeId (int) –

Display mode, one of

• DataViews.EMPTY_MODE: display nothing

• DataViews.PLOT1D_MODE: display the data as a curve

• DataViews.IMAGE_MODE: display the data as an image

• DataViews.PLOT3D_MODE: display the data as an isosurface

• DataViews.RAW_MODE: display the data as a table

• DataViews.STACK_MODE: display the data as a stack of images

• DataViews.HDF5_MODE: display the data as a table of HDF5 info

• DataViews.NXDATA_MODE: display the data as NXdata

displayedView()

Returns the current displayed view.

Return type

silx.gui.data.DataViews.DataView

addView(view)

Allow to add a view to the dataview.

If the current data support this view, it will be displayed.

Parameters

view (DataView) – A dataview

removeView(view)

Allow to remove a view which was available from the dataview.

If the view was displayed, the widget will be updated.

Parameters

view (DataView) – A dataview

getSafeViewFromAvailableViews(data, available)

Returns a view which is sure to display something without failing on rendering.

Parameters

• data (object) – data which will be displayed

• available (List[view]) – List of available views, from highest priority to lowest.

Return type

DataView

getDefaultViewFromAvailableViews(data, available)

Returns the default view which will be used according to available views.

Parameters

• data (object) – data which will be displayed

• available (List[view]) – List of available views, from highest priority to lowest.

Return type

DataView

currentAvailableViews()

Returns the list of available views for the current data

Return type

List[DataView]

getReachableViews()

Returns the list of reachable views from the registred available views.

Return type

List[DataView]

availableViews()

Returns the list of registered views

Return type

List[DataView]

setData(data)

Set the data to view.

It mostly can be a h5py.Dataset or a numpy.ndarray. Other kind of objects will be displayed as text rendering.

Parameters

data (numpy.ndarray) – The data.

data()

Returns the data

displayMode()

Returns the current display mode

replaceView(modeId, newView)

Replace one of the builtin data views with a custom view. Return True in case of success, False in case of failure.

Note

This method must be called just after instantiation, before the viewer is used.

Parameters

• modeId (int) –

  Unique mode ID identifying the DataView to be replaced. One of:

  • DataViews.EMPTY_MODE

  • DataViews.PLOT1D_MODE

  • DataViews.IMAGE_MODE

  • DataViews.PLOT2D_MODE

  • DataViews.COMPLEX_IMAGE_MODE

  • DataViews.PLOT3D_MODE

  • DataViews.RAW_MODE

  • DataViews.STACK_MODE

  • DataViews.HDF5_MODE

  • DataViews.NXDATA_MODE

  • DataViews.NXDATA_INVALID_MODE

  • DataViews.NXDATA_SCALAR_MODE

  • DataViews.NXDATA_CURVE_MODE

  • DataViews.NXDATA_XYVSCATTER_MODE

  • DataViews.NXDATA_IMAGE_MODE

  • DataViews.NXDATA_STACK_MODE

• newView (DataViews.DataView) – New data view

Returns

True if replacement was successful, else False