items: SceneWidget items

The following classes are items that describes the content of a SceneWidget:

• ImageData

• ImageRgba

• Scatter2D

• Scatter3D

• ScalarField3D

• ClipPlane

• Mesh

• GroupItem

2D images

ImageData

ImageData inherits from DataItem3D and also provides its API.

class ImageData(parent=None)

Description of a 2D image data.

Parameters:

parent – The View widget this item belongs to.

setData(data, copy=True)

Set the image data to display.

The data will be casted to float32.

Parameters:

• data (numpy.ndarray) – The image data

• copy (bool) – True (default) to copy the data, False to use as is (do not modify!).

getData(copy=True)

Get the image data.

Parameters:

copy (bool) – True (default) to get a copy, False to get internal representation (do not modify!).

Return type:

numpy.ndarray

Returns:

The image data

getColormap()

Return the used colormap

setColormap(colormap)

Set the colormap of this item

Parameters:

colormap (silx.gui.colors.Colormap) – colormap description

getInterpolation()

Returns the interpolation mode set by setInterpolation()

Return type:

str

setInterpolation(mode)

Set image interpolation mode

Parameters:

mode (str) – ‘nearest’ or ‘linear’

ImageRgba

ImageRgba inherits from DataItem3D and also provides its API.

class ImageRgba(parent=None)

Description of a 2D data RGB(A) image.

Parameters:

parent – The View widget this item belongs to.

setData(data, copy=True)

Set the RGB(A) image data to display.

Supported array format: float32 in [0, 1], uint8.

Parameters:

• data (numpy.ndarray) – The RGBA image data as an array of shape (H, W, Channels)

• copy (bool) – True (default) to copy the data, False to use as is (do not modify!).

getData(copy=True)

Get the image data.

Parameters:

copy (bool) – True (default) to get a copy, False to get internal representation (do not modify!).

Return type:

numpy.ndarray

Returns:

The image data

getInterpolation()

Returns the interpolation mode set by setInterpolation()

Return type:

str

setInterpolation(mode)

Set image interpolation mode

Parameters:

mode (str) – ‘nearest’ or ‘linear’

2D/3D scatter data

Scatter2D

Scatter2D inherits from DataItem3D and also provides its API.

class Scatter2D(parent=None)

2D scatter data with settable visualization mode.

Parameters:

parent – The View widget this item belongs to.

isPropertyEnabled(name, visualization=None)

Returns true if the property is used with visualization mode.

Parameters:

• name (str) – The name of the property to check, in: ‘lineWidth’, ‘symbol’, ‘symbolSize’

• visualization (str) – The visualization mode for which to get the info. By default, it is the current visualization mode.

Returns:

setHeightMap(heightMap)

Set whether to display the data has a height map or not.

When displayed as a height map, the data values are used as z coordinates.

Parameters:

heightMap (bool) – True to display a height map, False to display as 2D data with z=0

isHeightMap()

Returns True if data is displayed as a height map.

Return type:

bool

getLineWidth()

Return the curve line width in pixels (float)

setLineWidth(width)

Set the width in pixel of the curve line

See getLineWidth().

Parameters:

width (float) – Width in pixels

setData(x, y, value, copy=True)

Set the data represented by this item.

Provided arrays must have the same length.

Parameters:

• x (numpy.ndarray) – X coordinates (array-like)

• y (numpy.ndarray) – Y coordinates (array-like)

• value – Points value: array-like or single scalar

• copy (bool) – True (default) to make a copy of the data, False to avoid copy if possible (do not modify the arrays).

getData(copy=True)

Returns data as provided to setData().

Parameters:

copy (bool) – True to get a copy, False to return internal data (do not modify!)

Returns:

(x, y, value)

getXData(copy=True)

Returns X data coordinates.

Parameters:

copy (bool) – True to get a copy, False to return internal array (do not modify!)

Returns:

X coordinates

Return type:

numpy.ndarray

getYData(copy=True)

Returns Y data coordinates.

Parameters:

copy (bool) – True to get a copy, False to return internal array (do not modify!)

Returns:

Y coordinates

Return type:

numpy.ndarray

getValueData(copy=True)

Returns data values.

Parameters:

copy (bool) – True to get a copy, False to return internal array (do not modify!)

Returns:

data values

Return type:

numpy.ndarray

classmethod supportedVisualizations()

Returns the list of supported scatter visualization modes.

See setVisualization()

Return type:

List[Visualization]

getVisualization()

Returns the scatter plot visualization mode in use.

Return type:

Visualization

setVisualization(mode)

Set the scatter plot visualization mode to use.

See Visualization for all possible values, and supportedVisualizations() for supported ones.

Parameters:

mode (Union[str,Visualization]) – The visualization mode to use.

Returns:

True if value was set, False if is was already set

Return type:

bool

getColormap()

Return the used colormap

setColormap(colormap)

Set the colormap of this item

Parameters:

colormap (silx.gui.colors.Colormap) – colormap description

classmethod getSupportedSymbols()

Returns the list of supported symbol names.

Return type:

tuple of str

getSymbol()

Return the point marker type.

Marker type:

- 'o' circle
- '.' point
- ',' pixel
- '+' cross
- 'x' x-cross
- 'd' diamond
- 's' square

Return type:

str

setSymbol(symbol)

Set the marker type

See getSymbol().

Parameters:

symbol (str) – Marker type or marker name

Scatter3D

Scatter3D inherits from DataItem3D and also provides its API.

class Scatter3D(parent=None)

Description of a 3D scatter plot.

Parameters:

parent – The View widget this item belongs to.

setData(x, y, z, value, copy=True)

Set the data of the scatter plot

Parameters:

• x (numpy.ndarray) – Array of X coordinates (single value not accepted)

• y – Points Y coordinate (array-like or single value)

• z – Points Z coordinate (array-like or single value)

• value – Points values (array-like or single value)

• copy (bool) – True (default) to copy the data, False to use provided data (do not modify!)

getData(copy=True)

Returns data as provided to setData().

Parameters:

copy (bool) – True to get a copy, False to return internal data (do not modify!)

Returns:

(x, y, z, value)

getXData(copy=True)

Returns X data coordinates.

Parameters:

copy (bool) – True to get a copy, False to return internal array (do not modify!)

Returns:

X coordinates

Return type:

numpy.ndarray

getYData(copy=True)

Returns Y data coordinates.

Parameters:

copy (bool) – True to get a copy, False to return internal array (do not modify!)

Returns:

Y coordinates

Return type:

numpy.ndarray

getZData(copy=True)

Returns Z data coordinates.

Parameters:

copy (bool) – True to get a copy, False to return internal array (do not modify!)

Returns:

Z coordinates

Return type:

numpy.ndarray

getValueData(copy=True)

Returns data values.

Parameters:

copy (bool) – True to get a copy, False to return internal array (do not modify!)

Returns:

data values

Return type:

numpy.ndarray

getColormap()

Return the used colormap

setColormap(colormap)

Set the colormap of this item

Parameters:

colormap (silx.gui.colors.Colormap) – colormap description

classmethod getSupportedSymbols()

Returns the list of supported symbol names.

Return type:

tuple of str

getSymbol()

Return the point marker type.

Marker type:

- 'o' circle
- '.' point
- ',' pixel
- '+' cross
- 'x' x-cross
- 'd' diamond
- 's' square

Return type:

str

setSymbol(symbol)

Set the marker type

See getSymbol().

Parameters:

symbol (str) – Marker type or marker name

3D volume

ScalarField3D

ScalarField3D inherits from DataItem3D and also provides its API.

class ScalarField3D(parent=None)

3D scalar field on a regular grid.

Parameters:

parent – The View widget this item belongs to.

setData(data, copy=True)

Set the 3D scalar data represented by this item.

Dataset order is zyx (i.e., first dimension is z).

Parameters:

• data (3D numpy.ndarray of float32 with shape at least (2, 2, 2)) – 3D array

• copy (bool) – True (default) to make a copy, False to avoid copy (DO NOT MODIFY data afterwards)

getData(copy=True)

Return 3D dataset.

Parameters:

copy (bool) – True (default) to get a copy, False to get the internal data (DO NOT modify!)

Returns:

The data set (or None if not set)

getCutPlanes()

Return an iterable of all CutPlane of this item.

This includes hidden cut planes.

For now, there is always one cut plane.

sigIsosurfaceAdded

Signal emitted when a new iso-surface is added to the view.

The newly added iso-surface is provided by this signal

sigIsosurfaceRemoved

Signal emitted when an iso-surface is removed from the view

The removed iso-surface is provided by this signal.

addIsosurface(level, color)

Add an isosurface to this item.

Parameters:

• level (float or callable) – The value at which to build the iso-surface or a callable (e.g., a function) taking a 3D numpy.ndarray as input and returning a float. Example: numpy.mean(data) + numpy.std(data)

• color (str or array-like of 4 float in [0., 1.]) – RGBA color of the isosurface

Returns:

isosurface object

Return type:

Isosurface

getIsosurfaces()

Return an iterable of all Isosurface instance of this item

removeIsosurface(isosurface)

Remove an iso-surface from this item.

Parameters:

isosurface (Isosurface) – The isosurface object to remove

clearIsosurfaces()

Remove all Isosurface instances from this item.

The following classes allows to configure ScalarField3D visualization:

IsoSurface

IsoSurface inherits from Item3D and also provides its API.

class Isosurface(parent)

Bases: Item3D

Class representing an iso-surface in a ScalarField3D item.

Parameters:

parent – The DataItem3D this iso-surface belongs to

setParent(parent)

Override set parent to handle root item change

getData(copy=True)

Return 3D dataset.

Parameters:

copy (bool) – True (default) to get a copy, False to get the internal data (DO NOT modify!)

Returns:

The data set (or None if not set)

getLevel()

Return the level of this iso-surface (float)

setLevel(level)

Set the value at which to build the iso-surface.

Setting this value reset auto-level function

Parameters:

level (float) – The value at which to build the iso-surface

isAutoLevel()

True if iso-level is rebuild for each data set.

getAutoLevelFunction()

Return the function computing the iso-level (callable or None)

setAutoLevelFunction(autoLevel)

Set the function used to compute the iso-level.

WARNING: The function might get called in a thread.

Parameters:

autoLevel (callable) – A function taking a 3D numpy.ndarray of float32 and returning a float used as iso-level. Example: numpy.mean(data) + numpy.std(data)

getColor()

Return the color of this iso-surface (QColor)

setColor(color)

Set the color of the iso-surface

Parameters:

color (QColor, str or array-like of 4 float in [0., 1.]) – RGBA color of the isosurface

CutPlane

CutPlane inherits from Item3D and also provides its API.

class CutPlane(parent)

Class representing a cutting plane in a ScalarField3D item.

Parameters:

parent – 3D Data set in which the cut plane is applied.

getDisplayValuesBelowMin()

Return whether values <= colormap min are displayed or not.

Return type:

bool

setDisplayValuesBelowMin(display)

Set whether to display values <= colormap min.

Parameters:

display (bool) – True to show values below min, False to discard them

getColormap()

Return the used colormap

setColormap(colormap)

Set the colormap of this item

Parameters:

colormap (silx.gui.colors.Colormap) – colormap description

getInterpolation()

Returns the interpolation mode set by setInterpolation()

Return type:

str

setInterpolation(mode)

Set image interpolation mode

Parameters:

mode (str) – ‘nearest’ or ‘linear’

moveToCenter()

Move cut plane to center of data set

isValid()

Returns whether the cut plane is defined or not (bool)

getNormal()

Returns the normal of the plane (as a unit vector)

Returns:

Normal (nx, ny, nz), vector is 0 if no plane is defined

Return type:

numpy.ndarray

setNormal(normal)

Set the normal of the plane

Parameters:

normal – 3-tuple of float: nx, ny, nz

getPoint()

Returns a point on the plane

Returns:

(x, y, z)

Return type:

numpy.ndarray

setPoint(point)

Set a point contained in the plane.

Warning: The plane might not intersect the bounding box of the data.

Parameters:

point (3-tuple of float) – (x, y, z) position

getParameters()

Returns the plane equation parameters: a*x + b*y + c*z + d = 0

Returns:

Plane equation parameters: (a, b, c, d)

Return type:

numpy.ndarray

setParameters(parameters)

Set the plane equation parameters: a*x + b*y + c*z + d = 0

Warning: The plane might not intersect the bounding box of the data. The given parameters will be normalized.

Parameters:

parameters – (a, b, c, d) equation parameters

Height map

HeightMapData

HeightMapData inherits from DataItem3D and also provides its API.

class HeightMapData(parent=None)

Description of a 2D height field associated to a colormapped dataset.

Parameters:

parent – The View widget this item belongs to.

setColormappedData(data, copy=True)

Set the 2D data used to compute colors.

Parameters:

• data – 2D array of data

• copy (bool) – True (default) to copy the data, False to use as is (do not modify!).

getColormappedData(copy=True)

Returns the 2D data used to compute colors.

Parameters:

copy (bool) – True (default) to get a copy, False to get internal representation (do not modify!).

Return type:

ndarray

getData(copy=True)

Get the height field 2D data.

Parameters:

• copy (bool) – True (default) to get a copy, False to get internal representation (do not modify!).

• copy

Return type:

ndarray

setData(data, copy=True)

Set the height field data.

Parameters:

• data

• copy (bool) – True (default) to copy the data, False to use as is (do not modify!).

HeightMapRGBA

HeightMapRGBA inherits from DataItem3D and also provides its API.

class HeightMapRGBA(parent=None)

Description of a 2D height field associated to a RGB(A) image.

Parameters:

parent – The View widget this item belongs to.

setColorData(data, copy=True)

Set the RGB(A) image to use.

Supported array format: float32 in [0, 1], uint8.

Parameters:

• data – The RGBA image data as an array of shape (H, W, Channels)

• copy (bool) – True (default) to copy the data, False to use as is (do not modify!).

getColorData(copy=True)

Get the RGB(A) image data.

Parameters:

copy (bool) – True (default) to get a copy, False to get internal representation (do not modify!).

Return type:

ndarray

getData(copy=True)

Get the height field 2D data.

Parameters:

• copy (bool) – True (default) to get a copy, False to get internal representation (do not modify!).

• copy

Return type:

ndarray

setData(data, copy=True)

Set the height field data.

Parameters:

• data

• copy (bool) – True (default) to copy the data, False to use as is (do not modify!).

Clipping plane

ClipPlane

ClipPlane inherits from Item3D and also provides its API.

class ClipPlane(parent=None)

Bases: Item3D, PlaneMixIn

Represents a clipping plane that clips following items within the group.

For now only on clip plane is allowed at once in a scene.

3D mesh

Mesh

Mesh inherits from DataItem3D and also provides its API.

class Mesh(parent=None)

Bases: _MeshBase

Description of mesh.

Parameters:

parent – The View widget this item belongs to.

setData(position, color, normal=None, mode='triangles', indices=None, copy=True)

Set mesh geometry data.

Supported drawing modes are: ‘triangles’, ‘triangle_strip’, ‘fan’

Parameters:

• position (numpy.ndarray) – Position (x, y, z) of each vertex as a (N, 3) array

• color (numpy.ndarray) – Colors for each point or a single color

• normal (Union[numpy.ndarray,None]) – Normals for each point or None (default)

• mode (str) – The drawing mode.

• indices (Union[List[int],None]) – Array of vertex indices or None to use arrays directly.

• copy (bool) – True (default) to copy the data, False to use as is (do not modify!).

getData(copy=True)

Get the mesh geometry.

Parameters:

copy (bool) – True (default) to get a copy, False to get internal representation (do not modify!).

Returns:

The positions, colors, normals and mode

Return type:

tuple of numpy.ndarray

getColorData(copy=True)

Get the mesh vertex colors.

Parameters:

copy (bool) – True (default) to get a copy, False to get internal representation (do not modify!).

Returns:

The RGBA colors as a (N, 4) array or a single color

Return type:

numpy.ndarray

Item base classes

The following classes provides the base classes for other items.

Item3D

class Item3D(parent, primitive=None)

Bases: QObject

Base class representing an item in the scene.

Parameters:

• parent – The View widget this item belongs to.

• primitive – An optional primitive to use as scene primitive

sigItemChanged

Signal emitted when an item’s property has changed.

It provides a flag describing which property of the item has changed. See ItemChangedType and Item3DChangedType for flags description.

setParent(parent)

Override set parent to handle root item change

root()

Returns the root of the scene this item belongs to.

The root is the up-most Item3D in the scene tree hierarchy.

Return type:

Union[Item3D, None]

getLabel()

Returns the label associated to this item.

Return type:

str

setLabel(label)

Set the label associated to this item.

Parameters:

label (str)

isVisible()

Returns True if item is visible, else False

Return type:

bool

setVisible(visible=True)

Set the visibility of the item in the scene.

Parameters:

visible (bool) – True (default) to show the item, False to hide

DataItem3D

DataItem3D inherits from Item3D and also provides its API.

class DataItem3D(parent, group=None)

Bases: Item3D

Base class representing a data item with transform in the scene.

Parameters:

• parent – The View widget this item belongs to.

• group (Union[GroupBBox, None]) – The scene group to use for rendering

setScale(sx=1.0, sy=1.0, sz=1.0)

Set the scale of the item in the scene.

Parameters:

• sx (float) – Scale factor along the X axis

• sy (float) – Scale factor along the Y axis

• sz (float) – Scale factor along the Z axis

getScale()

Returns the scales provided by setScale().

Return type:

numpy.ndarray

setTranslation(x=0.0, y=0.0, z=0.0)

Set the translation of the origin of the item in the scene.

Parameters:

• x (float) – Offset of the data origin on the X axis

• y (float) – Offset of the data origin on the Y axis

• z (float) – Offset of the data origin on the Z axis

getTranslation()

Returns the offset set by setTranslation().

Return type:

numpy.ndarray

setRotationCenter(x=0.0, y=0.0, z=0.0)

Set the center of rotation of the item.

Position of the rotation center is either a float for an absolute position or one of the following string to define a position relative to the item’s bounding box: ‘lower’, ‘center’, ‘upper’

Parameters:

• x – rotation center position on the X axis

• y – rotation center position on the Y axis

• z – rotation center position on the Z axis

Return type:

float or str

Return type:

float or str

Return type:

float or str

getRotationCenter()

Returns the rotation center set by setRotationCenter().

Return type:

3-tuple of float or str

setRotation(angle=0.0, axis=(0.0, 0.0, 1.0))

Set the rotation of the item in the scene

Parameters:

• angle (float) – The rotation angle in degrees.

• axis – The (x, y, z) coordinates of the rotation axis.

getRotation()

Returns the rotation set by setRotation().

Returns:

(angle, axis)

Return type:

2-tuple (float, numpy.ndarray)

setMatrix(matrix=None)

Set the transform matrix

Parameters:

matrix (numpy.ndarray) – 3x3 transform matrix

getMatrix()

Returns the matrix set by setMatrix()

Returns:

3x3 matrix

Return type:

numpy.ndarray

isBoundingBoxVisible()

Returns item’s bounding box visibility.

Return type:

bool

setBoundingBoxVisible(visible)

Set item’s bounding box visibility.

Parameters:

visible (bool) – True to show the bounding box, False (default) to hide it

GroupItem

GroupItem inherits from DataItem3D and also provides its API.

class GroupItem(parent=None)

Bases: _BaseGroupItem

Group of items sharing a common transform.