`items`: Plot primitives#

This package provides classes that describes PlotWidget content.

Instances of those classes are returned by PlotWidget methods that give access to its content such as PlotWidget.getCurve(), PlotWidget.getImage().

Item#

All plot primitives inherits from Item as a common ground:

class Item[source]#

Bases: QObject

Description of an item of the plot

sigItemChanged#

Signal emitted when the item has changed.

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

getPlot()[source]#

Returns the ~silx.gui.plot.PlotWidget this item belongs to.

Return type:: Union[PlotWidget,None]

getBounds()[source]#

Returns the bounding box of this item in data coordinates

Returns:: (xmin, xmax, ymin, ymax) or None
Return type:: 4-tuple of float or None

isVisible()[source]#

True if item is visible, False otherwise

Return type:: bool

setVisible(visible)[source]#

Set visibility of item.

Parameters:: visible (bool) – True to display it, False otherwise

isOverlay()[source]#

Return true if item is drawn as an overlay.

Return type:: bool

getName()[source]#

Returns the name of the item which is used as legend.

Return type:: str

setName(name)[source]#

Set the name of the item which is used as legend.

Parameters:: name (str) – New name of the item
Raises:: RuntimeError – If item belongs to a PlotWidget.

isSelectable()[source]#: Returns true if item is selectable (bool)

getZValue()[source]#: Returns the layer on which to draw this item (int)

getInfo(copy=True)[source]#

Returns the info associated to this item

Parameters:: copy (bool) – True to get a deepcopy, False otherwise.

getVisibleBounds()[source]#

Returns visible bounds of the item bounding box in the plot area.

Returns:: (xmin, xmax, ymin, ymax) in data coordinates of the visible area or None if item is not visible in the plot area.
Return type:: Union[List[float],None]

eventFilter(watched, event)[source]#: Event filter to handle PlotWidget show events

pick(x, y)[source]#

Run picking test on this item

Parameters:

x (float) – The x pixel coord where to pick.
y (float) – The y pixel coord where to pick.

Returns:

None if not picked, else the picked position information

Return type:

Union[None,PickingResult]

Curve#

class Curve[source]#

Description of a curve

getData(copy=True, displayed=False)#

Returns the x, y values of the curve points and xerror, yerror

Parameters:

copy (bool) – True (Default) to get a copy, False to use internal representation (do not modify!)
displayed (bool) – True to only get curve points that are displayed in the plot. Note: If plot has log scale, negative points are not displayed. Negative errors are set to 0.

Returns:

(x, y, xerror, yerror)

Return type:

4-tuple of numpy.ndarray

getXData(copy=True)#

Returns the x coordinates of the data points

Parameters:: copy – True (Default) to get a copy, False to use internal representation (do not modify!)
Return type:: numpy.ndarray

getYData(copy=True)#

Returns the y coordinates of the data points

Parameters:: copy – True (Default) to get a copy, False to use internal representation (do not modify!)
Return type:: numpy.ndarray

getXErrorData(copy=True)#

Returns the x error of the points

Parameters:: copy – True (Default) to get a copy, False to use internal representation (do not modify!)
Return type:: numpy.ndarray, float or None

getYErrorData(copy=True)#

Returns the y error of the points

Parameters:: copy – True (Default) to get a copy, False to use internal representation (do not modify!)
Return type:: numpy.ndarray, float or None

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

getSymbolSize()#

Return the point marker size in points.

Return type:: float

setSymbolSize(size)#

Set the point marker size in points.

See getSymbolSize().

Parameters:: symbol (str) – Marker type

getAlpha()#

Returns the opacity of the item

Return type:: float in [0, 1.]

setAlpha(alpha)#

Set the opacity of the item

Note

If the colormap already has some transparency, this alpha adds additional transparency. The alpha channel of the colormap is multiplied by this value.

Parameters:: alpha (float) – Opacity of the item, between 0 (full transparency) and 1. (full opacity)

getColor()#

Returns the RGBA color of the item

Return type:: 4-tuple of float in [0, 1] or array of colors

setColor(color, copy=True)#

Set item color

Parameters:

color (str ("#RRGGBB") or (npoints, 4) unsigned byte array or one of the predefined color names defined in colors.py) – color(s) to be used
copy (bool) – True (Default) to get a copy, False to use internal representation (do not modify!)

getYAxis()#

Returns the Y axis this curve belongs to.

Either ‘left’ or ‘right’.

Return type:: str

setYAxis(yaxis)#

Set the Y axis this curve belongs to.

Parameters:: yaxis (str) – ‘left’ or ‘right’

isFill()#

Returns whether the item is filled or not.

Return type:: bool

setFill(fill)#

Set whether to fill the item or not.

Parameters:: fill (bool)

getXLabel()#

Return the X axis label associated to this curve

Return type:: str or None

getYLabel()#

Return the Y axis label associated to this curve

Return type:: str or None

getLineWidth()#

Return the curve line width in pixels

Return type:: float

setLineWidth(width)#

Set the width in pixel of the curve line

See getLineWidth().

Parameters:: width (float)

getLineStyle()#

Return the type of the line

Type of line:

- ' '  no line
- '-'  solid line
- '--' dashed line
- '-.' dash-dot line
- ':'  dotted line
- (offset, (dash pattern))

Return type:: Union[str, Tuple[Union[float, int], None], Tuple[Union[float, int], Tuple[Union[float, int], Union[float, int]]], Tuple[Union[float, int], Tuple[Union[float, int], Union[float, int], Union[float, int], Union[float, int]]]]

setLineStyle(style)#

Set the style of the curve line.

See getLineStyle().

Parameters:: style (Union[str, Tuple[Union[float, int], None], Tuple[Union[float, int], Tuple[Union[float, int], Union[float, int]]], Tuple[Union[float, int], Tuple[Union[float, int], Union[float, int], Union[float, int], Union[float, int]]], None]) – Line style

isHighlighted()#

Returns True if curve is highlighted.

Return type:: bool

setHighlighted(highlighted)#

Set the highlight state of the curve

Parameters:: highlighted (bool)

getHighlightedStyle()#

Returns the highlighted style in use

Return type:: CurveStyle

setHighlightedStyle(style)#

Set the style to use for highlighting

Parameters:: style (CurveStyle) – New style to use

getCurrentStyle()[source]#

Returns the current curve style.

Curve style depends on curve highlighting

Return type:: CurveStyle

setData(x, y, xerror=None, yerror=None, baseline=None, copy=True)[source]#

Set the data of the curve.

Parameters:

x (numpy.ndarray) – The data corresponding to the x coordinates.
y (numpy.ndarray) – The data corresponding to the y coordinates.
xerror (A float, or a numpy.ndarray of float32. If it is an array, it can either be a 1D array of same length as the data or a 2D array with 2 rows of same length as the data: row 0 for positive errors, row 1 for negative errors.) – Values with the uncertainties on the x values
yerror (A float, or a numpy.ndarray of float32. See xerror.) – Values with the uncertainties on the y values.
baseline (Union[None,float,numpy.ndarray]) – curve baseline
copy (bool) – True make a copy of the data (default), False to use provided arrays.

class CurveStyle(color=None, linestyle=None, linewidth=None, symbol=None, symbolsize=None, gapcolor=None)[source]#

Object storing the style of a curve.

Set a value to None to use the default

Parameters:

color (Optional[Tuple[float, float, float, float]]) – Color
linestyle (Union[str, Tuple[Union[float, int], None], Tuple[Union[float, int], Tuple[Union[float, int], Union[float, int]]], Tuple[Union[float, int], Tuple[Union[float, int], Union[float, int], Union[float, int], Union[float, int]]], None]) – Style of the line
linewidth (float | None) – Width of the line
symbol (str | None) – Symbol for markers
symbolsize (float | None) – Size of the markers
gapcolor (Optional[Tuple[float, float, float, float]]) – Color of gaps of dashed line

getColor(copy=True)[source]#

Returns the color or None if not set.

Parameters:: copy (bool) – True to get a copy (default), False to get internal representation (do not modify!)
Return type:: Union[List[float],None]

getLineStyle()[source]#

Return the type of the line or None if not set.

Type of line:

- ' '  no line
- '-'  solid line
- '--' dashed line
- '-.' dash-dot line
- ':'  dotted line
- (offset, (dash pattern))

Return type:: Union[str, Tuple[Union[float, int], None], Tuple[Union[float, int], Tuple[Union[float, int], Union[float, int]]], Tuple[Union[float, int], Tuple[Union[float, int], Union[float, int], Union[float, int], Union[float, int]]], None]

getLineWidth()[source]#

Return the curve line width in pixels or None if not set.

Return type:: Union[float,None]

getSymbol()[source]#

Return the point marker type.

Marker type:

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

Return type:: Union[str,None]

getSymbolSize()[source]#

Return the point marker size in points.

Return type:: Union[float,None]

Images#

class ImageData[source]#

Description of a data image with a colormap

getRgbaImageData(copy=True)[source]#

Get the displayed RGB(A) image

Returns:: Array of uint8 of shape (height, width, 4)
Return type:: numpy.ndarray

getAlternativeImageData(copy=True)[source]#

Get the optional RGBA image that is displayed instead of the data

Parameters:: copy (bool) – True (Default) to get a copy, False to use internal representation (do not modify!)
Return type:: Union[None,numpy.ndarray]

getData(copy=True)#

Returns the image data

Parameters:: copy (bool) – True (Default) to get a copy, False to use internal representation (do not modify!)
Return type:: numpy.ndarray

getOrigin()#

Returns the offset from origin at which to display the image.

Return type:: 2-tuple of float

setOrigin(origin)#

Set the offset from origin at which to display the image.

Parameters:: origin (float or 2-tuple of float) – (ox, oy) Offset from origin

getScale()#

Returns the scale of the image in data coordinates.

Return type:: 2-tuple of float

setScale(scale)#

Set the scale of the image

Parameters:: scale (float or 2-tuple of float) – (sx, sy) Scale of the image

isDraggable()#

Returns true if image is draggable

Return type:: bool

getAlpha()#

Returns the opacity of the item

Return type:: float in [0, 1.]

setAlpha(alpha)#

Set the opacity of the item

Note

If the colormap already has some transparency, this alpha adds additional transparency. The alpha channel of the colormap is multiplied by this value.

Parameters:: alpha (float) – Opacity of the item, between 0 (full transparency) and 1. (full opacity)

getColormap()#: Return the used colormap

setColormap(colormap)#

Set the colormap of this item

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

class ImageRgba[source]#

Description of an RGB(A) image

getRgbaImageData(copy=True)[source]#

Get the displayed RGB(A) image

Returns:: numpy.ndarray of uint8 of shape (height, width, 4)

getData(copy=True)#

Returns the image data

Parameters:: copy (bool) – True (Default) to get a copy, False to use internal representation (do not modify!)
Return type:: numpy.ndarray

getOrigin()#

Returns the offset from origin at which to display the image.

Return type:: 2-tuple of float

setOrigin(origin)#

Set the offset from origin at which to display the image.

Parameters:: origin (float or 2-tuple of float) – (ox, oy) Offset from origin

getScale()#

Returns the scale of the image in data coordinates.

Return type:: 2-tuple of float

setScale(scale)#

Set the scale of the image

Parameters:: scale (float or 2-tuple of float) – (sx, sy) Scale of the image

isDraggable()#

Returns true if image is draggable

Return type:: bool

getAlpha()#

Returns the opacity of the item

Return type:: float in [0, 1.]

setAlpha(alpha)#

Set the opacity of the item

Note

If the colormap already has some transparency, this alpha adds additional transparency. The alpha channel of the colormap is multiplied by this value.

Parameters:: alpha (float) – Opacity of the item, between 0 (full transparency) and 1. (full opacity)

Scatter#

class Scatter[source]#

Description of a scatter

getValueData(copy=True)[source]#

Returns the value assigned to the scatter data points.

Parameters:: copy – True (Default) to get a copy, False to use internal representation (do not modify!)
Return type:: numpy.ndarray

getData(copy=True, displayed=False)[source]#

Returns the x, y coordinates and the value of the data points

Parameters:

copy – True (Default) to get a copy, False to use internal representation (do not modify!)
displayed (bool) – True to only get curve points that are displayed in the plot. Default: False. Note: If plot has log scale, negative points are not displayed.

Returns:

(x, y, value, xerror, yerror)

Return type:

5-tuple of numpy.ndarray

getXData(copy=True)#

Returns the x coordinates of the data points

Parameters:: copy – True (Default) to get a copy, False to use internal representation (do not modify!)
Return type:: numpy.ndarray

getYData(copy=True)#

Returns the y coordinates of the data points

Parameters:: copy – True (Default) to get a copy, False to use internal representation (do not modify!)
Return type:: numpy.ndarray

getXErrorData(copy=True)#

Returns the x error of the points

Parameters:: copy – True (Default) to get a copy, False to use internal representation (do not modify!)
Return type:: numpy.ndarray, float or None

getYErrorData(copy=True)#

Returns the y error of the points

Parameters:: copy – True (Default) to get a copy, False to use internal representation (do not modify!)
Return type:: numpy.ndarray, float or None

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

getSymbolSize()#

Return the point marker size in points.

Return type:: float

setSymbolSize(size)#

Set the point marker size in points.

See getSymbolSize().

Parameters:: symbol (str) – Marker type

getAlpha()#

Returns the opacity of the item

Return type:: float in [0, 1.]

setAlpha(alpha)#

Set the opacity of the item

Note

If the colormap already has some transparency, this alpha adds additional transparency. The alpha channel of the colormap is multiplied by this value.

Parameters:: alpha (float) – Opacity of the item, between 0 (full transparency) and 1. (full opacity)

getColormap()#: Return the used colormap

setColormap(colormap)#

Set the colormap of this item

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

setData(x, y, value, xerror=None, yerror=None, alpha=None, copy=True)[source]#

Set the data of the scatter.

Parameters:

x (numpy.ndarray) – The data corresponding to the x coordinates.
y (numpy.ndarray) – The data corresponding to the y coordinates.
value (numpy.ndarray) – The data corresponding to the value of the data points.
xerror (A float, or a numpy.ndarray of float32. If it is an array, it can either be a 1D array of same length as the data or a 2D array with 2 rows of same length as the data: row 0 for lower errors, row 1 for upper errors.) – Values with the uncertainties on the x values
yerror (A float, or a numpy.ndarray of float32. See xerror.) – Values with the uncertainties on the y values
alpha (A float, or a numpy.ndarray of float32) – Values with the transparency (between 0 and 1)
copy (bool) – True make a copy of the data (default), False to use provided arrays.

Histogram#

class Histogram[source]#

Description of an histogram

getValueData(copy=True)[source]#

The values of the histogram

Parameters:: copy – True (Default) to get a copy, False to use internal representation (do not modify!)
Returns:: The values of the histogram
Return type:: numpy.ndarray

getBinEdgesData(copy=True)[source]#

The bin edges of the histogram (number of histogram values + 1)

Parameters:: copy – True (Default) to get a copy, False to use internal representation (do not modify!)
Returns:: The bin edges of the histogram
Return type:: numpy.ndarray

getData(copy=True)[source]#

Return the histogram values, bin edges and baseline

Parameters:: copy – True (Default) to get a copy, False to use internal representation (do not modify!)
Returns:: (N histogram value, N+1 bin edges)
Return type:: 2-tuple of numpy.nadarray

getAlpha()#

Returns the opacity of the item

Return type:: float in [0, 1.]

setAlpha(alpha)#

Set the opacity of the item

Note

If the colormap already has some transparency, this alpha adds additional transparency. The alpha channel of the colormap is multiplied by this value.

Parameters:: alpha (float) – Opacity of the item, between 0 (full transparency) and 1. (full opacity)

getColor()#

Returns the RGBA color of the item

Return type:: 4-tuple of float in [0, 1] or array of colors

setColor(color, copy=True)#

Set item color

Parameters:

color (str ("#RRGGBB") or (npoints, 4) unsigned byte array or one of the predefined color names defined in colors.py) – color(s) to be used
copy (bool) – True (Default) to get a copy, False to use internal representation (do not modify!)

getYAxis()#

Returns the Y axis this curve belongs to.

Either ‘left’ or ‘right’.

Return type:: str

setYAxis(yaxis)#

Set the Y axis this curve belongs to.

Parameters:: yaxis (str) – ‘left’ or ‘right’

isFill()#

Returns whether the item is filled or not.

Return type:: bool

setFill(fill)#

Set whether to fill the item or not.

Parameters:: fill (bool)

getLineWidth()#

Return the curve line width in pixels

Return type:: float

setLineWidth(width)#

Set the width in pixel of the curve line

See getLineWidth().

Parameters:: width (float)

getLineStyle()#

Return the type of the line

Type of line:

- ' '  no line
- '-'  solid line
- '--' dashed line
- '-.' dash-dot line
- ':'  dotted line
- (offset, (dash pattern))

Return type:: Union[str, Tuple[Union[float, int], None], Tuple[Union[float, int], Tuple[Union[float, int], Union[float, int]]], Tuple[Union[float, int], Tuple[Union[float, int], Union[float, int], Union[float, int], Union[float, int]]]]

setLineStyle(style)#

Set the style of the curve line.

See getLineStyle().

Parameters:: style (Union[str, Tuple[Union[float, int], None], Tuple[Union[float, int], Tuple[Union[float, int], Union[float, int]]], Tuple[Union[float, int], Tuple[Union[float, int], Union[float, int], Union[float, int], Union[float, int]]], None]) – Line style

setData(histogram, edges, align='center', baseline=None, copy=True)[source]#

Set the histogram values and bin edges.

Parameters:

histogram (numpy.ndarray) – The values of the histogram.
edges (numpy.ndarray) – The bin edges of the histogram. If histogram and edges have the same length, the bin edges are computed according to the align parameter.
align (str) – In case histogram values and edges have the same length N, the N+1 bin edges are computed according to the alignment in: ‘center’ (default), ‘left’, ‘right’.
baseline (Union[None,float,numpy.ndarray]) – histogram baseline
copy (bool) – True make a copy of the data (default), False to use provided arrays.

Markers#

class Marker[source]#

Description of a marker

getText()#

Returns marker text.

Return type:: str

setText(text)#

Set the text of the marker.

Parameters:: text (str) – The text to use

getXPosition()#

Returns the X position of the marker line in data coordinates

Return type:: float or None

getYPosition()#

Returns the Y position of the marker line in data coordinates

Return type:: float or None

getPosition()#

Returns the (x, y) position of the marker in data coordinates

Return type:: 2-tuple of float or None

setPosition(x, y)#

Set marker position in data coordinates

Constraint are applied if any.

Parameters:

x (float) – X coordinates in data frame
y (float) – Y coordinates in data frame
x
y

getConstraint()#: Returns the dragging constraint of this item

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

getSymbolSize()#

Return the point marker size in points.

Return type:: float

setSymbolSize(size)#

Set the point marker size in points.

See getSymbolSize().

Parameters:: symbol (str) – Marker type

class XMarker[source]#

Description of a marker

getText()#

Returns marker text.

Return type:: str

setText(text)#

Set the text of the marker.

Parameters:: text (str) – The text to use

getXPosition()#

Returns the X position of the marker line in data coordinates

Return type:: float or None

getYPosition()#

Returns the Y position of the marker line in data coordinates

Return type:: float or None

getPosition()#

Returns the (x, y) position of the marker in data coordinates

Return type:: 2-tuple of float or None

setPosition(x, y)[source]#

Set marker line position in data coordinates

Constraint are applied if any.

Parameters:

x (float) – X coordinates in data frame
y (float) – Y coordinates in data frame

getConstraint()#: Returns the dragging constraint of this item

class YMarker[source]#

Description of a marker

getText()#

Returns marker text.

Return type:: str

setText(text)#

Set the text of the marker.

Parameters:: text (str) – The text to use

getXPosition()#

Returns the X position of the marker line in data coordinates

Return type:: float or None

getYPosition()#

Returns the Y position of the marker line in data coordinates

Return type:: float or None

getPosition()#

Returns the (x, y) position of the marker in data coordinates

Return type:: 2-tuple of float or None

getConstraint()#: Returns the dragging constraint of this item

setPosition(x, y)[source]#

Set marker line position in data coordinates

Constraint are applied if any.

Parameters:

x (float) – X coordinates in data frame
y (float) – Y coordinates in data frame

Shapes#

class Shape(type_)[source]#

Description of a shape item

Parameters:: type (str) – The type of shape in: ‘hline’, ‘polygon’, ‘rectangle’, ‘vline’, ‘polylines’

getType()[source]#

Returns the type of shape to draw.

One of: ‘hline’, ‘polygon’, ‘rectangle’, ‘vline’, ‘polylines’

Return type:: str

getPoints(copy=True)[source]#

Get the control points of the shape.

Parameters:: copy (bool) – True (Default) to get a copy, False to use internal representation (do not modify!)
Returns:: Array of point coordinates
Return type:: numpy.ndarray with 2 dimensions

setPoints(points, copy=True)[source]#

Set the point coordinates

Parameters:

points (numpy.ndarray) – Array of point coordinates
copy (bool) – True (Default) to get a copy, False to use internal representation (do not modify!)

Returns:

setOverlay(overlay)#

Set the overlay state of the shape

Parameters:: overlay (bool) – True to make it an overlay

getColor()#

Returns the RGBA color of the item

Return type:: 4-tuple of float in [0, 1] or array of colors

setColor(color, copy=True)#

Set item color

Parameters:

color (str ("#RRGGBB") or (npoints, 4) unsigned byte array or one of the predefined color names defined in colors.py) – color(s) to be used
copy (bool) – True (Default) to get a copy, False to use internal representation (do not modify!)

isFill()#

Returns whether the item is filled or not.

Return type:: bool

setFill(fill)#

Set whether to fill the item or not.

Parameters:: fill (bool)

Item changed signal#

Plot items emit a Item.sigItemChanged signal when their values are updated. This signal provides a flag in the following enumeration describing the modified value:

class ItemChangedType(value, names=<not given>, *values, module=None, qualname=None, type=None, start=1, boundary=None)[source]#

Type of modification provided by Item.sigItemChanged signal.

VISIBLE = 'visibleChanged'#: Item’s visibility changed flag.

ZVALUE = 'zValueChanged'#: Item’s Z value changed flag.

COLORMAP = 'colormapChanged'#

Item’s colormap changed flag.

This is emitted both when setting a new colormap and when the current colormap object is updated.

SYMBOL = 'symbolChanged'#: Item’s symbol changed flag.

SYMBOL_SIZE = 'symbolSizeChanged'#: Item’s symbol size changed flag.

LINE_WIDTH = 'lineWidthChanged'#: Item’s line width changed flag.

LINE_STYLE = 'lineStyleChanged'#: Item’s line style changed flag.

COLOR = 'colorChanged'#: Item’s color changed flag.

LINE_GAP_COLOR = 'lineGapColorChanged'#: Item’s dashed line gap color changed flag.

YAXIS = 'yAxisChanged'#: Item’s Y axis binding changed flag.

FILL = 'fillChanged'#: Item’s fill changed flag.

ALPHA = 'alphaChanged'#: Item’s transparency alpha changed flag.

DATA = 'dataChanged'#: Item’s data changed flag

MASK = 'maskChanged'#: Item’s mask changed flag

HIGHLIGHTED = 'highlightedChanged'#: Item’s highlight state changed flag.

HIGHLIGHTED_COLOR = 'highlightedColorChanged'#: Deprecated, use HIGHLIGHTED_STYLE instead.

HIGHLIGHTED_STYLE = 'highlightedStyleChanged'#: Item’s highlighted style changed flag.

SCALE = 'scaleChanged'#: Item’s scale changed flag.

TEXT = 'textChanged'#: Item’s text changed flag.

POSITION = 'positionChanged'#

Item’s position changed flag.

This is emitted when a marker position changed and when an image origin changed.

OVERLAY = 'overlayChanged'#: Item’s overlay state changed flag.

VISUALIZATION_MODE = 'visualizationModeChanged'#: Item’s visualization mode changed flag.

COMPLEX_MODE = 'complexModeChanged'#: Item’s complex data visualization mode changed flag.

NAME = 'nameChanged'#: Item’s name changed flag.

EDITABLE = 'editableChanged'#: Item’s editable state changed flags.

SELECTABLE = 'selectableChanged'#: Item’s selectable state changed flags.

FONT = 'fontChanged'#: Item’s text font changed flag.

BACKGROUND_COLOR = 'backgroundColorChanged'#: Item’s text background color changed flag.

Axis#

class Axis(plot)[source]#

This class describes and controls a plot axis.

Note: This is an abstract class.

LINEAR = 'linear'#: Constant defining a linear scale

LOGARITHMIC = 'log'#: Constant defining a logarithmic scale

sigInvertedChanged#: Signal emitted when axis orientation has changed

sigScaleChanged#: Signal emitted when axis scale has changed

sigAutoScaleChanged#: Signal emitted when axis autoscale has changed

sigLimitsChanged#: Signal emitted when axis limits have changed

getLimits()[source]#

Get the limits of this axis.

Returns:: Minimum and maximum values of this axis as tuple

setLimits(vmin, vmax)[source]#

Set this axis limits.

Parameters:

vmin (float) – minimum axis value
vmax (float) – maximum axis value

isInverted()[source]#

Return True if the axis is inverted (top to bottom for the y-axis), False otherwise. It is always False for the X axis.

Return type:: bool

setInverted(isInverted)[source]#

Set the axis orientation.

This is only available for the Y axis.

Parameters:: flag (bool) – True for Y axis going from top to bottom, False for Y axis going from bottom to top

isVisible()[source]#

Returns whether the axis is displayed or not

Return type:: bool

getLabel()[source]#

Return the current displayed label of this axis.

Parameters:: axis (str) – The Y axis for which to get the label (left or right)
Return type:: str

setLabel(label)[source]#

Set the label displayed on the plot for this axis.

The provided label can be temporarily replaced by the label of the active curve if any.

Parameters:: label (str) – The axis label

getScale()[source]#

Return the name of the scale used by this axis.

Return type:: str

setScale(scale)[source]#

Set the scale to be used by this axis.

Parameters:: scale (str) – Name of the scale (“log”, or “linear”)

getTimeZone()[source]#

Sets tzinfo that is used if this axis plots date times.

None means the datetimes are interpreted as local time.

Return type:: datetime.tzinfo of None.

setTimeZone(tz)[source]#

Sets tzinfo that is used if this axis’ tickMode is TIME_SERIES

The tz must be a descendant of the datetime.tzinfo class, “UTC” or None. Use None to let the datetimes be interpreted as local time. Use the string “UTC” to let the date datetimes be in UTC time.

Parameters:: tz – datetime.tzinfo, “UTC” or None.

getTickMode()[source]#

Determines if axis ticks are number or datetimes.

Return type:: TickMode enum.

setTickMode(tickMode)[source]#

Determines if axis ticks are number or datetimes.

Parameters:: tickMode (TickMode) – tick mode enum.

isAutoScale()[source]#

Return True if axis is automatically adjusting its limits.

Return type:: bool

setAutoScale(flag=True)[source]#

Set the axis limits adjusting behavior of resetZoom().

Parameters:: flag (bool) – True to resize limits automatically, False to disable it.

setLimitsConstraints(minPos=None, maxPos=None)[source]#

Set a constraint on the position of the axes.

Parameters:

minPos (float) – Minimum allowed axis value.
maxPos (float) – Maximum allowed axis value.

Returns:

True if the constaints was updated

Return type:

bool

setRangeConstraints(minRange=None, maxRange=None)[source]#

Set a constraint on the position of the axes.

Parameters:

minRange (float) – Minimum allowed left-to-right span across the view
maxRange (float) – Maximum allowed left-to-right span across the view

Returns:

True if the constaints was updated

Return type:

bool

`roi`: Regions of Interest#

This module provides ROI item for the PlotWidget.

Inheritance diagram of silx.gui.plot.items.roi

class ArcROI(parent=None)[source]#

Bases: HandleBasedROI, LineMixIn, InteractionModeMixIn

A ROI identifying an arc of a circle with a width.

This ROI provides - 3 handle to control the curvature - 1 handle to control the weight - 1 anchor to translate the shape.

ICON = 'add-shape-arc'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

NAME = 'arc ROI'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

SHORT_NAME = 'arc'#: Metadata for this kind of ROI

class Role(value, names=<not given>, *values, module=None, qualname=None, type=None, start=1, boundary=None)[source]#

Bases: Enum

Identify a set of roles which can be used for now to reach some positions

START = 0#: Location of the anchor at the start of the arc

STOP = 1#: Location of the anchor at the stop of the arc

MIDDLE = 2#: Location of the anchor at the middle of the arc

CENTER = 3#: Location of the center of the circle

availableInteractionModes()[source]#

Returns the list of available interaction modes

Return type:: List[RoiInteractionMode]

setFirstShapePoints(points)[source]#

Initialize the ROI using the points from the first interaction.

This interaction is constrained by the plot API and only supports few shapes.

handleDragUpdated(handle, origin, previous, current)[source]#: Called when an handle drag position changed

handleDragFinished(handle, origin, current)[source]#: Called when an handle drag finished

getGeometry()[source]#

Returns a tuple containing the geometry of this ROI

It is a symmetric function of setGeometry().

If startAngle is smaller than endAngle the rotation is clockwise, else the rotation is anticlockwise.

Return type:: Tuple[numpy.ndarray,float,float,float,float]
Raises:: ValueError – In case the ROI can’t be represented as section of a circle

getPosition(role=Role.CENTER)[source]#

Returns a position by it’s role.

By default returns the center of the circle of the arc ROI.

Parameters:: role (Role)
Return type:: Tuple[float, float]

isClosed()[source]#

Returns true if the arc is a closed shape, like a circle or a donut.

Return type:: bool

getCenter()[source]#

Returns the center of the circle used to draw arcs of this ROI.

This center is usually outside the the shape itself.

Return type:: numpy.ndarray

getStartAngle()[source]#

Returns the angle of the start of the section of this ROI (in radian).

If startAngle is smaller than endAngle the rotation is clockwise, else the rotation is anticlockwise.

Return type:: float

getEndAngle()[source]#

Returns the angle of the end of the section of this ROI (in radian).

If startAngle is smaller than endAngle the rotation is clockwise, else the rotation is anticlockwise.

Return type:: float

getInnerRadius()[source]#

Returns the radius of the smaller arc used to draw this ROI.

Return type:: float

getOuterRadius()[source]#

Returns the radius of the bigger arc used to draw this ROI.

Return type:: float

setGeometry(center, innerRadius, outerRadius, startAngle, endAngle)[source]#

Set the geometry of this arc.

Parameters:

center (numpy.ndarray) – Center of the circle.
innerRadius (float) – Radius of the smaller arc of the section.
outerRadius (float) – Weight of the bigger arc of the section. It have to be bigger than innerRadius
startAngle (float) – Location of the start of the section (in radian)
endAngle (float) – Location of the end of the section (in radian). If startAngle is smaller than endAngle the rotation is clockwise, else the rotation is anticlockwise.

contains(position)[source]#

Returns True if the position is in this ROI.

Parameters:: position (tuple[float,float]) – position to check
Returns:: True if the value / point is consider to be in the region of interest.
Return type:: bool

class BandROI(parent=None)[source]#

Bases: HandleBasedROI, LineMixIn, InteractionModeMixIn

A ROI identifying a line in a 2D plot.

This ROI provides 1 anchor for each boundary of the line, plus an center in the center to translate the full ROI.

ICON = 'add-shape-rotated-rectangle'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

NAME = 'band ROI'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

SHORT_NAME = 'band'#: Metadata for this kind of ROI

BoundedMode = <silx.gui.plot.items._roi_base.RoiInteractionMode object>#: Interaction mode for a rectangular band ROI

UnboundedMode = <silx.gui.plot.items._roi_base.RoiInteractionMode object>#: Interaction mode for unlimited band ROI

availableInteractionModes()[source]#

Returns the list of available interaction modes

Return type:: List[RoiInteractionMode]

setAvailableInteractionModes(modes)[source]#

Allows to restrict interaction modes of the ROI.

Parameters:: modes (Iterable[RoiInteractionMode]) – Subset of BandROI interaction modes: BoundedMode and UnboundedMode.
Return type:: None

setFirstShapePoints(points)[source]#

Initialize the ROI using the points from the first interaction.

This interaction is constrained by the plot API and only supports few shapes.

getGeometry()[source]#

Returns the geometric description of the ROI

Return type:: BandGeometry

setGeometry(begin, end, width=None)[source]#

Set the geometry of the ROI

Parameters:

begin (Sequence[float]) – Starting point as (x, y)
width (Optional[float]) – Width of the ROI
end (Sequence[float])

Paran end:

Closing point as (x, y)

handleDragUpdated(handle, origin, previous, current)[source]#: Called when an handle drag position changed

contains(position)[source]#

Returns True if the position is in this ROI.

Parameters:: position (tuple[float,float]) – position to check
Returns:: True if the value / point is consider to be in the region of interest.
Return type:: bool

class PointROI(parent=None)[source]#

Bases: RegionOfInterest, SymbolMixIn

A ROI identifying a point in a 2D plot.

ICON = 'add-shape-point'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

NAME = 'point markers'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

SHORT_NAME = 'point'#: Metadata for this kind of ROI

setFirstShapePoints(points)[source]#

Initialize the ROI using the points from the first interaction.

This interaction is constrained by the plot API and only supports few shapes.

getPosition()[source]#

Returns the position of this ROI

Return type:: Tuple[float, float]

setPosition(pos)[source]#

Set the position of this ROI

Parameters:: pos – 2d-coordinate of this point

contains(position)[source]#

Returns True if the position is in this ROI.

Parameters:: position (tuple[float,float]) – position to check
Returns:: True if the value / point is consider to be in the region of interest.
Return type:: bool

class CrossROI(parent=None)[source]#

Bases: HandleBasedROI, LineMixIn

A ROI identifying a point in a 2D plot and displayed as a cross

ICON = 'add-shape-cross'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

NAME = 'cross marker'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

SHORT_NAME = 'cross'#: Metadata for this kind of ROI

setFirstShapePoints(points)[source]#

Initialize the ROI using the points from the first interaction.

This interaction is constrained by the plot API and only supports few shapes.

getPosition()[source]#

Returns the position of this ROI

Return type:: Tuple[float, float]

setPosition(pos)[source]#

Set the position of this ROI

Parameters:: pos (Tuple[float, float]) – 2d-coordinate of this point

contains(position)[source]#

Returns True if the position is in this ROI.

Parameters:: position (tuple[float,float]) – position to check
Returns:: True if the value / point is consider to be in the region of interest.
Return type:: bool

class LineROI(parent=None)[source]#

Bases: HandleBasedROI, LineMixIn

A ROI identifying a line in a 2D plot.

This ROI provides 1 anchor for each boundary of the line, plus an center in the center to translate the full ROI.

ICON = 'add-shape-diagonal'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

NAME = 'line ROI'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

SHORT_NAME = 'line'#: Metadata for this kind of ROI

setFirstShapePoints(points)[source]#

Initialize the ROI using the points from the first interaction.

This interaction is constrained by the plot API and only supports few shapes.

setEndPoints(startPoint, endPoint)[source]#

Set this line location using the ending points

Parameters:

startPoint (ndarray) – Staring bounding point of the line
endPoint (ndarray) – Ending bounding point of the line
startPoint
endPoint

getEndPoints()[source]#

Returns bounding points of this ROI.

Return type:: Tuple(numpy.ndarray,numpy.ndarray)

handleDragUpdated(handle, origin, previous, current)[source]#: Called when an handle drag position changed

contains(position)[source]#

Returns True if the position is in this ROI.

Parameters:: position (tuple[float,float]) – position to check
Returns:: True if the value / point is consider to be in the region of interest.
Return type:: bool

class HorizontalLineROI(parent=None)[source]#

Bases: RegionOfInterest, LineMixIn

A ROI identifying an horizontal line in a 2D plot.

ICON = 'add-shape-horizontal'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

NAME = 'horizontal line ROI'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

SHORT_NAME = 'hline'#: Metadata for this kind of ROI

setFirstShapePoints(points)[source]#

Initialize the ROI using the points from the first interaction.

This interaction is constrained by the plot API and only supports few shapes.

getPosition()[source]#

Returns the position of this line if the horizontal axis

Return type:: float

setPosition(pos)[source]#

Set the position of this ROI

Parameters:: pos (float) – Horizontal position of this line

contains(position)[source]#

Returns True if the position is in this ROI.

Parameters:: position (tuple[float,float]) – position to check
Returns:: True if the value / point is consider to be in the region of interest.
Return type:: bool

class VerticalLineROI(parent=None)[source]#

Bases: RegionOfInterest, LineMixIn

A ROI identifying a vertical line in a 2D plot.

ICON = 'add-shape-vertical'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

NAME = 'vertical line ROI'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

SHORT_NAME = 'vline'#: Metadata for this kind of ROI

setFirstShapePoints(points)[source]#

Initialize the ROI using the points from the first interaction.

This interaction is constrained by the plot API and only supports few shapes.

getPosition()[source]#

Returns the position of this line if the horizontal axis

Return type:: float

setPosition(pos)[source]#

Set the position of this ROI

Parameters:

pos (float) – Horizontal position of this line
pos

contains(position)[source]#

Returns True if the position is in this ROI.

Parameters:: position (tuple[float,float]) – position to check
Returns:: True if the value / point is consider to be in the region of interest.
Return type:: bool

class RectangleROI(parent=None)[source]#

Bases: HandleBasedROI, LineMixIn

A ROI identifying a rectangle in a 2D plot.

This ROI provides 1 anchor for each corner, plus an anchor in the center to translate the full ROI.

ICON = 'add-shape-rectangle'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

NAME = 'rectangle ROI'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

SHORT_NAME = 'rectangle'#: Metadata for this kind of ROI

setFirstShapePoints(points)[source]#

Initialize the ROI using the points from the first interaction.

This interaction is constrained by the plot API and only supports few shapes.

getCenter()[source]#

Returns the central point of this rectangle

Return type:: numpy.ndarray([float,float])

getOrigin()[source]#

Returns the corner point with the smaller coordinates

Return type:: numpy.ndarray([float,float])

getSize()[source]#

Returns the size of this rectangle

Return type:: numpy.ndarray([float,float])

setOrigin(position)[source]#

Set the origin position of this ROI

Parameters:: position (numpy.ndarray) – Location of the smaller corner of the ROI

setSize(size)[source]#

Set the size of this ROI

Parameters:: size (numpy.ndarray) – Size of the center of the ROI

setCenter(position)[source]#

Set the size of this ROI

Parameters:: position (numpy.ndarray) – Location of the center of the ROI

setGeometry(origin=None, size=None, center=None)[source]#: Set the geometry of the ROI

contains(position)[source]#

Returns True if the position is in this ROI.

Parameters:: position (tuple[float,float]) – position to check
Returns:: True if the value / point is consider to be in the region of interest.
Return type:: bool

handleDragUpdated(handle, origin, previous, current)[source]#: Called when an handle drag position changed

class CircleROI(parent=None)[source]#

Bases: HandleBasedROI, LineMixIn

A ROI identifying a circle in a 2D plot.

This ROI provides 1 anchor at the center to translate the circle, and one anchor on the perimeter to change the radius.

ICON = 'add-shape-circle'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

NAME = 'circle ROI'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

SHORT_NAME = 'circle'#: Metadata for this kind of ROI

setFirstShapePoints(points)[source]#

Initialize the ROI using the points from the first interaction.

This interaction is constrained by the plot API and only supports few shapes.

getCenter()[source]#

Returns the central point of this rectangle

Return type:: numpy.ndarray([float,float])

getRadius()[source]#

Returns the radius of this circle

Return type:: float

setCenter(position)[source]#

Set the center point of this ROI

Parameters:: position (numpy.ndarray) – Location of the center of the circle

setRadius(radius)[source]#

Set the size of this ROI

Parameters:: size (float) – Radius of the circle

setGeometry(center, radius)[source]#: Set the geometry of the ROI

handleDragUpdated(handle, origin, previous, current)[source]#: Called when an handle drag position changed

contains(position)[source]#

Returns True if the position is in this ROI.

Parameters:: position (tuple[float,float]) – position to check
Returns:: True if the value / point is consider to be in the region of interest.
Return type:: bool

class EllipseROI(parent=None)[source]#

Bases: HandleBasedROI, LineMixIn

A ROI identifying an oriented ellipse in a 2D plot.

This ROI provides 1 anchor at the center to translate the circle, and two anchors on the perimeter to modify the major-radius and minor-radius. These two anchors also allow to change the orientation.

ICON = 'add-shape-ellipse'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

NAME = 'ellipse ROI'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

SHORT_NAME = 'ellipse'#: Metadata for this kind of ROI

setFirstShapePoints(points)[source]#

Initialize the ROI using the points from the first interaction.

This interaction is constrained by the plot API and only supports few shapes.

getCenter()[source]#

Returns the central point of this rectangle

Return type:: numpy.ndarray([float,float])

getMajorRadius()[source]#

Returns the half-diameter of the major axis.

Return type:: float

getMinorRadius()[source]#

Returns the half-diameter of the minor axis.

Return type:: float

getOrientation()[source]#

Return angle in radians between the horizontal (X) axis and the major axis of the ellipse in [0, 2*pi[

Return type:: float:

setCenter(center)[source]#

Set the center point of this ROI

Parameters:: position (numpy.ndarray) – Coordinates (X, Y) of the center of the ellipse

setMajorRadius(radius)[source]#

Set the half-diameter of the major axis of the ellipse.

Parameters:: radius (float) – Major radius of the ellipsis. Must be a positive value.

setMinorRadius(radius)[source]#

Set the half-diameter of the minor axis of the ellipse.

Parameters:: radius (float) – Minor radius of the ellipsis. Must be a positive value.

setOrientation(orientation)[source]#

Rotate the ellipse

Parameters:: orientation (float) – Angle in radians between the horizontal and the major axis.
Returns:

setGeometry(center=None, radius=None, orientation=None)[source]#

Parameters:

center – (X, Y) coordinates
majorRadius (float)
minorRadius (float)
orientation (float) – angle in radians between the major axis and the horizontal

Returns:

handleDragUpdated(handle, origin, previous, current)[source]#: Called when an handle drag position changed

contains(position)[source]#

Returns True if the position is in this ROI.

Parameters:: position (tuple[float,float]) – position to check
Returns:: True if the value / point is consider to be in the region of interest.
Return type:: bool

class PolygonROI(parent=None)[source]#

Bases: HandleBasedROI, LineMixIn

A ROI identifying a closed polygon in a 2D plot.

This ROI provides 1 anchor for each point of the polygon.

ICON = 'add-shape-polygon'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

NAME = 'polygon ROI'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

SHORT_NAME = 'polygon'#: Metadata for this kind of ROI

setFirstShapePoints(points)[source]#

Initialize the ROI using the points from the first interaction.

This interaction is constrained by the plot API and only supports few shapes.

creationStarted()[source]#: Called when the ROI creation interaction was started.

isBeingCreated()[source]#: Returns true if the ROI is in creation step

creationFinalized()[source]#: Called when the ROI creation interaction was finalized.

getPoints()[source]#

Returns the list of the points of this polygon.

Return type:: numpy.ndarray

setPoints(points)[source]#

Set the position of this ROI

Parameters:: pos (numpy.ndarray) – 2d-coordinate of this point

handleDragUpdated(handle, origin, previous, current)[source]#: Called when an handle drag position changed

handleDragFinished(handle, origin, current)[source]#: Called when an handle drag finished

contains(position)[source]#

Returns True if the position is in this ROI.

Parameters:: position (tuple[float,float]) – position to check
Returns:: True if the value / point is consider to be in the region of interest.
Return type:: bool

class HorizontalRangeROI(parent=None)[source]#

Bases: RegionOfInterest, LineMixIn

A ROI identifying an horizontal range in a 1D plot.

ICON = 'add-range-horizontal'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

NAME = 'horizontal range ROI'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

SHORT_NAME = 'hrange'#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

setFirstShapePoints(points)[source]#

Initialize the ROI using the points from the first interaction.

This interaction is constrained by the plot API and only supports few shapes.

setRange(vmin, vmax)[source]#

Set the range of this ROI.

Parameters:

vmin (float) – Staring location of the range
vmax (float) – Ending location of the range

getRange()[source]#

Returns the range of this ROI.

Return type:: Tuple[float,float]

setMin(vmin)[source]#

Set the min of this ROI.

Parameters:: vmin (float) – New min

getMin()[source]#

Returns the min value of this ROI.

Return type:: float

setMax(vmax)[source]#

Set the max of this ROI.

Parameters:: vmax (float) – New max

getMax()[source]#

Returns the max value of this ROI.

Return type:: float

setCenter(center)[source]#

Set the center of this ROI.

Parameters:: center (float) – New center

getCenter()[source]#

Returns the center location of this ROI.

Return type:: float

contains(position)[source]#

Returns True if the position is in this ROI.

Parameters:: position (tuple[float,float]) – position to check
Returns:: True if the value / point is consider to be in the region of interest.
Return type:: bool

Base class for regions of interest#

class _RegionOfInterestBase(parent=None)[source]#

Bases: QObject

Base class of 1D and 2D region of interest

Parameters:

parent (QObject) – See QObject
name (str) – The name of the ROI

sigAboutToBeRemoved#: Signal emitted just before this ROI is removed from its manager.

sigItemChanged#

Signal emitted when item has changed.

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

getName()[source]#

Returns the name of the ROI

Returns:: name of the region of interest
Return type:: str

setName(name)[source]#

Set the name of the ROI

Parameters:: name (str) – name of the region of interest

contains(position)[source]#

Returns True if the position is in this ROI.

Parameters:: position (tuple[float,float]) – position to check
Returns:: True if the value / point is consider to be in the region of interest.
Return type:: bool

class RegionOfInterest(parent=None)[source]#

Bases: _RegionOfInterestBase, HighlightedMixIn

Object describing a region of interest in a plot.

Parameters:: parent (QObject) – The RegionOfInterestManager that created this object

ICON = None#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

NAME = None#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

SHORT_NAME = None#

Metadata to describe the ROI in labels, tooltips and widgets

Should be set by inherited classes to custom the ROI manager widget.

sigRegionChanged#: Signal emitted everytime the shape or position of the ROI changes

sigEditingStarted#: Signal emitted when the user start editing the roi

sigEditingFinished#: Signal emitted when the region edition is finished. During edition sigEditionChanged will be emitted several times and sigRegionEditionFinished only at end

setParent(parent)[source]#

Set the parent of the RegionOfInterest

Parameters:: parent (Union[None,RegionOfInterestManager]) – The new parent

addItem(item)[source]#

Add an item to the set of this ROI children.

This item will be added and removed to the plot used by the ROI.

If the ROI is already part of a plot, the item will also be added to the plot.

It the item do not have a name already, a unique one is generated to avoid item collision in the plot.

Parameters:: item (silx.gui.plot.items.Item) – A plot item

removeItem(item)[source]#

Remove an item from this ROI children.

If the item is part of a plot it will be removed too.

Parameters:: item (silx.gui.plot.items.Item) – A plot item

getItems()[source]#

Returns the list of PlotWidget items of this RegionOfInterest.

Return type:: List[Item]

getColor()[source]#

Returns the color of this ROI

Return type:: QColor

setColor(color)[source]#

Set the color used for this ROI.

Parameters:: color – The color to use for ROI shape as either a color name, a QColor, a list of uint8 or float in [0, 1].

isEditable()[source]#

Returns whether the ROI is editable by the user or not.

Return type:: bool

setEditable(editable)[source]#

Set whether the ROI can be changed interactively.

Parameters:: editable (bool) – True to allow edition by the user, False to disable.

isSelectable()[source]#

Returns whether the ROI is selectable by the user or not.

Return type:: bool

setSelectable(selectable)[source]#

Set whether the ROI can be selected interactively.

Parameters:: selectable (bool) – True to allow selection by the user, False to disable.

getFocusProxy()[source]#

Returns the ROI which have to be selected when this ROI is selected, else None if no proxy specified.

Return type:: RegionOfInterest

setFocusProxy(roi)[source]#

Set the real ROI which will be selected when this ROI is selected, else None to remove the proxy already specified.

Parameters:: roi (RegionOfInterest) – A ROI

isVisible()[source]#

Returns whether the ROI is visible in the plot.

Note

This does not take into account whether or not the plot widget itself is visible (unlike QWidget.isVisible() which checks the visibility of all its parent widgets up to the window)

Return type:: bool

setVisible(visible)[source]#

Set whether the plot items associated with this ROI are visible in the plot.

Parameters:: visible (bool) – True to show the ROI in the plot, False to hide it.

getText()[source]#

Returns the currently displayed text for this ROI

Return type:: str

setText(text=None)[source]#

Set the displayed text for this ROI.

If None (the default), the ROI name is used.

Parameters:: text (Optional[str])
Return type:: None

classmethod showFirstInteractionShape()[source]#

Returns True if the shape created by the first interaction and managed by the plot have to be visible.

Return type:: bool

classmethod getFirstInteractionShape()[source]#

Returns the shape kind which will be used by the very first interaction with the plot.

This interactions are hardcoded inside the plot

Return type:: str

setFirstShapePoints(points)[source]#

Initialize the ROI using the points from the first interaction.

This interaction is constrained by the plot API and only supports few shapes.

creationStarted()[source]#: Called when the ROI creation interaction was started.

creationFinalized()[source]#: Called when the ROI creation interaction was finalized.

getCurrentStyle()[source]#

Returns the current curve style.

Curve style depends on curve highlighting

Return type:: CurveStyle

populateContextMenu(menu)[source]#

Populate a menu used as a context menu

Parameters:: menu (QMenu)

class HandleBasedROI(parent=None)[source]#

Bases: RegionOfInterest

Manage a ROI based on a set of handles

addUserHandle(item=None)[source]#

Add a new free handle to the ROI.

This handle do nothing. It have to be managed by the ROI implementing this class.

Parameters:: item (Union[None,silx.gui.plot.items.Marker]) – The new marker to add, else None to create a default marker.
Return type:: silx.gui.plot.items.Marker

addLabelHandle(item=None)[source]#

Add a new label handle to the ROI.

This handle is not draggable nor selectable.

It is displayed without symbol, but it is always visible anyway the ROI is editable, in order to display text.

Parameters:: item (Union[None,silx.gui.plot.items.Marker]) – The new marker to add, else None to create a default marker.
Return type:: silx.gui.plot.items.Marker

addTranslateHandle(item=None)[source]#

Add a new translate handle to the ROI.

Dragging translate handles affect the position position of the ROI but not the shape itself.

Parameters:: item (Union[None,silx.gui.plot.items.Marker]) – The new marker to add, else None to create a default marker.
Return type:: silx.gui.plot.items.Marker

addHandle(item=None, role='default')[source]#

Add a new handle to the ROI.

Dragging handles while affect the position or the shape of the ROI.

Parameters:: item (Union[None,silx.gui.plot.items.Marker]) – The new marker to add, else None to create a default marker.
Return type:: silx.gui.plot.items.Marker

getHandles()[source]#

Returns the list of handles of this HandleBasedROI.

Return type:: List[Marker]

isHandleBeingDragged()[source]#

Returns True if one of the handles is currently being dragged.

Return type:: bool

handleDragStarted(handle, origin)[source]#: Called when an handler drag started

handleDragUpdated(handle, origin, previous, current)[source]#: Called when an handle drag position changed

handleDragFinished(handle, origin, current)[source]#: Called when an handle drag finished

class InteractionModeMixIn[source]#

Mix in feature which can be implemented by a ROI object.

This provides user interaction to switch between different interaction mode to edit the ROI.

This ROI modes have to be described using RoiInteractionMode, and taken into account during interation with handles.

availableInteractionModes()[source]#

Returns the list of available interaction modes

Must be implemented when inherited to provide all available modes.

Return type:: List[RoiInteractionMode]

setInteractionMode(modeId)[source]#

Set the interaction mode.

Parameters:: modeId (RoiInteractionMode) – Mode to use

getInteractionMode()[source]#

Returns the interaction mode.

Must be one of the returned availableInteractionModes().

Return type:: RoiInteractionMode

createMenuForInteractionMode(parent)[source]#

Create a menu providing access to the different interaction modes

Parameters:: parent (QWidget)
Return type:: QMenu

class RoiInteractionMode(label, description=None)[source]#

Description of an interaction mode.

An interaction mode provide a specific kind of interaction for a ROI. A ROI can implement many interaction.

property label#: Short name

property description#: Longer description of the interaction mode

items: Plot primitives#

Item#

Curve#

Images#

Scatter#

Histogram#

Markers#

Shapes#

Item changed signal#

Axis#

roi: Regions of Interest#

Base class for regions of interest#

`items`: Plot primitives#

`roi`: Regions of Interest#