plotpy.label

The labels module provides plot items related to labels and legends:
  • plotpy.shapes.LabelItem
  • plotpy.shapes.LegendBoxItem
  • plotpy.shapes.SelectedLegendBoxItem
  • plotpy.shapes.RangeComputation
  • plotpy.shapes.RangeComputation2d
  • plotpy.shapes.DataInfoLabel

A label or a legend is a plot item (derived from QwtPlotItem) that may be displayed on a 2D plotting widget like plotpy.curve.CurvePlot or plotpy.image.ImagePlot.

Reference

class plotpy.label.LabelItem(text=None, labelparam=None)[source]
serialize(writer)[source]

Serialize object to HDF5 writer

deserialize(reader)[source]

Deserialize object from HDF5 reader

attach(plot)

Attach the item to a plot.

This method will attach a QwtPlotItem to the QwtPlot argument. It will first detach the QwtPlotItem from any plot from a previous call to attach (if necessary). If a None argument is passed, it will detach from any QwtPlot it was attached to.

Parameters:plot (qwt.plot.QwtPlot) – Plot widget

See also

detach()

boundingRect()
Returns:An invalid bounding rect: QRectF(1.0, 1.0, -2.0, -2.0)

Note

A width or height < 0.0 is ignored by the autoscaler

defaultIcon(brush, size)

Return a default icon from a brush

The default icon is a filled rectangle used in several derived classes as legendIcon().

Parameters:
  • brush (QBrush) – Fill brush
  • size (QSizeF) – Icon size
Returns:

A filled rectangle
detach()

Detach the item from a plot.

This method detaches a QwtPlotItem from any QwtPlot it has been associated with.

See also

attach()

getCanvasMarginHint(xMap, yMap, canvasRect)

Calculate a hint for the canvas margin

When the QwtPlotItem::Margins flag is enabled the plot item indicates, that it needs some margins at the borders of the canvas. This is f.e. used by bar charts to reserve space for displaying the bars.

The margins are in target device coordinates ( pixels on screen )

Parameters:
  • xMap (qwt.scale_map.QwtScaleMap) – Maps x-values into pixel coordinates.
  • yMap (qwt.scale_map.QwtScaleMap) – Maps y-values into pixel coordinates.
  • canvasRect (QRectF) – Contents rectangle of the canvas in painter coordinates

See also

QwtPlot.getCanvasMarginsHint(), QwtPlot.updateCanvasMargins(),

hide()

Hide the item

isVisible()
Returns:True if visible

See also

setVisible(), show(), hide()

is_private()

Return True if object is private

is_readonly()

Return object readonly state

itemChanged()

Update the legend and call QwtPlot.autoRefresh() for the parent plot.

See also

QwtPlot.legendChanged(), QwtPlot.autoRefresh()

legendChanged()

Update the legend of the parent plot.

See also

QwtPlot.updateLegend(), itemChanged()

legendData()

Return all information, that is needed to represent the item on the legend

QwtLegendData is basically a list of QVariants that makes it possible to overload and reimplement legendData() to return almost any type of information, that is understood by the receiver that acts as the legend.

The default implementation returns one entry with the title() of the item and the legendIcon().

Returns:Data, that is needed to represent the item on the legend

See also

title(), legendIcon(), qwt.legend.QwtLegend

legendIcon(index, size)
Parameters:
  • index (int) – Index of the legend entry (usually there is only one)
  • size (QSizeF) – Icon size
Returns:

Icon representing the item on the legend

The default implementation returns an invalid icon

See also

setLegendIconSize(), legendData()

legendIconSize()
Returns:Legend icon size

See also

setLegendIconSize(), legendIcon()

move_local_point_to(handle, pos, ctrl=None)

Move a handle as returned by hit_test to the new position pos ctrl: True if <Ctrl> button is being pressed, False otherwise

move_local_shape(old_pos, new_pos)

Translate the shape such that old_pos becomes new_pos in canvas coordinates

move_with_selection(delta_x, delta_y)

Translate the shape together with other selected items delta_x, delta_y: translation in plot coordinates

paintRect(xMap, yMap)

Calculate the bounding paint rectangle of 2 maps

Parameters:
  • xMap (qwt.scale_map.QwtScaleMap) – Maps x-values into pixel coordinates.
  • yMap (qwt.scale_map.QwtScaleMap) – Maps y-values into pixel coordinates.
Returns:

Bounding paint rectangle of the scale maps, not normalized
plot()
Returns:attached plot
rtti()

Return rtti for the specific class represented. QwtPlotItem is simply a virtual interface class, and base classes will implement this method with specific rtti values so a user can differentiate them.

Returns:rtti value
scaleRect(xMap, yMap)

Calculate the bounding scale rectangle of 2 maps

Parameters:
  • xMap (qwt.scale_map.QwtScaleMap) – Maps x-values into pixel coordinates.
  • yMap (qwt.scale_map.QwtScaleMap) – Maps y-values into pixel coordinates.
Returns:

Bounding scale rect of the scale maps, not normalized
select()

Select item

setAxes(xAxis, yAxis)

Set X and Y axis

The item will painted according to the coordinates of its Axes.

Parameters:
  • xAxis (int) – X Axis (QwtPlot.xBottom or QwtPlot.xTop)
  • yAxis (int) – Y Axis (QwtPlot.yLeft or QwtPlot.yRight)

See also

setXAxis(), setYAxis(), xAxis(), yAxis()

setAxis(xAxis, yAxis)

Set X and Y axis

Warning

setAxis has been removed in Qwt6: please use setAxes() instead

setItemAttribute(attribute, on=True)

Toggle an item attribute

Parameters:
  • attribute (int) – Attribute type
  • on (bool) – True/False

See also

testItemAttribute()

setItemInterest(interest, on=True)

Toggle an item interest

Parameters:
  • attribute (int) – Interest type
  • on (bool) – True/False

See also

testItemInterest()

setLegendIconSize(size)

Set the size of the legend icon

The default setting is 8x8 pixels

Parameters:size (QSize) – Size

See also

legendIconSize(), legendIcon()

setRenderHint(hint, on=True)

Toggle a render hint

Parameters:
  • hint (int) – Render hint
  • on (bool) – True/False

See also

testRenderHint()

setTitle(title)

Set a new title

Parameters:title (qwt.text.QwtText or str) – Title

See also

title()

setVisible(on)

Show/Hide the item

Parameters:on (bool) – Show if True, otherwise hide

See also

isVisible(), show(), hide()

setXAxis(axis)

Set the X axis

The item will painted according to the coordinates its Axes.

Parameters:axis (int) – X Axis (QwtPlot.xBottom or QwtPlot.xTop)

See also

setAxes(), setYAxis(), xAxis(), yAxis()

setYAxis(axis)

Set the Y axis

The item will painted according to the coordinates its Axes.

Parameters:axis (int) – Y Axis (QwtPlot.yLeft or QwtPlot.yRight)

See also

setAxes(), setXAxis(), xAxis(), yAxis()

setZ(z)

Set the z value

Plot items are painted in increasing z-order.

Parameters:z (float) – Z-value

See also

z(), QwtPlotDict.itemList()

set_movable(state)

Set item movable state

set_private(state)

Set object as private

set_readonly(state)

Set object readonly state

set_resizable(state)

Set item resizable state (or any action triggered when moving an handle, e.g. rotation)

set_rotatable(state)

Set item rotatable state

set_selectable(state)

Set item selectable state

show()

Show the item

testItemAttribute(attribute)

Test an item attribute

Parameters:attribute (int) – Attribute type
Returns:True/False

See also

setItemAttribute()

testItemInterest(interest)

Test an item interest

Parameters:attribute (int) – Interest type
Returns:True/False

See also

setItemInterest()

testRenderHint(hint)

Test a render hint

Parameters:attribute (int) – Render hint
Returns:True/False

See also

setRenderHint()

title()
Returns:Title of the item

See also

setTitle()

unselect()

Unselect item

updateLegend(item, data)

Update the item to changes of the legend info

Plot items that want to display a legend ( not those, that want to be displayed on a legend ! ) will have to implement updateLegend().

updateLegend() is only called when the LegendInterest interest is enabled. The default implementation does nothing.

Parameters:
  • item (qwt.plot.QwtPlotItem) – Plot item to be displayed on a legend
  • data (list) – Attributes how to display item on the legend

Note

Plot items, that want to be displayed on a legend need to enable the QwtPlotItem.Legend flag and to implement legendData() and legendIcon()

xAxis()
Returns:xAxis
yAxis()
Returns:yAxis
z()

Plot items are painted in increasing z-order.

Returns:item z order

See also

setZ(), QwtPlotDict.itemList()

class plotpy.label.LegendBoxItem(labelparam=None)[source]
attach(plot)

Attach the item to a plot.

This method will attach a QwtPlotItem to the QwtPlot argument. It will first detach the QwtPlotItem from any plot from a previous call to attach (if necessary). If a None argument is passed, it will detach from any QwtPlot it was attached to.

Parameters:plot (qwt.plot.QwtPlot) – Plot widget

See also

detach()

boundingRect()
Returns:An invalid bounding rect: QRectF(1.0, 1.0, -2.0, -2.0)

Note

A width or height < 0.0 is ignored by the autoscaler

defaultIcon(brush, size)

Return a default icon from a brush

The default icon is a filled rectangle used in several derived classes as legendIcon().

Parameters:
  • brush (QBrush) – Fill brush
  • size (QSizeF) – Icon size
Returns:

A filled rectangle
deserialize(reader)

Deserialize object from HDF5 reader

detach()

Detach the item from a plot.

This method detaches a QwtPlotItem from any QwtPlot it has been associated with.

See also

attach()

getCanvasMarginHint(xMap, yMap, canvasRect)

Calculate a hint for the canvas margin

When the QwtPlotItem::Margins flag is enabled the plot item indicates, that it needs some margins at the borders of the canvas. This is f.e. used by bar charts to reserve space for displaying the bars.

The margins are in target device coordinates ( pixels on screen )

Parameters:
  • xMap (qwt.scale_map.QwtScaleMap) – Maps x-values into pixel coordinates.
  • yMap (qwt.scale_map.QwtScaleMap) – Maps y-values into pixel coordinates.
  • canvasRect (QRectF) – Contents rectangle of the canvas in painter coordinates

See also

QwtPlot.getCanvasMarginsHint(), QwtPlot.updateCanvasMargins(),

hide()

Hide the item

isVisible()
Returns:True if visible

See also

setVisible(), show(), hide()

is_private()

Return True if object is private

is_readonly()

Return object readonly state

itemChanged()

Update the legend and call QwtPlot.autoRefresh() for the parent plot.

See also

QwtPlot.legendChanged(), QwtPlot.autoRefresh()

legendChanged()

Update the legend of the parent plot.

See also

QwtPlot.updateLegend(), itemChanged()

legendData()

Return all information, that is needed to represent the item on the legend

QwtLegendData is basically a list of QVariants that makes it possible to overload and reimplement legendData() to return almost any type of information, that is understood by the receiver that acts as the legend.

The default implementation returns one entry with the title() of the item and the legendIcon().

Returns:Data, that is needed to represent the item on the legend

See also

title(), legendIcon(), qwt.legend.QwtLegend

legendIcon(index, size)
Parameters:
  • index (int) – Index of the legend entry (usually there is only one)
  • size (QSizeF) – Icon size
Returns:

Icon representing the item on the legend

The default implementation returns an invalid icon

See also

setLegendIconSize(), legendData()

legendIconSize()
Returns:Legend icon size

See also

setLegendIconSize(), legendIcon()

move_local_point_to(handle, pos, ctrl=None)

Move a handle as returned by hit_test to the new position pos ctrl: True if <Ctrl> button is being pressed, False otherwise

move_local_shape(old_pos, new_pos)

Translate the shape such that old_pos becomes new_pos in canvas coordinates

move_with_selection(delta_x, delta_y)

Translate the shape together with other selected items delta_x, delta_y: translation in plot coordinates

paintRect(xMap, yMap)

Calculate the bounding paint rectangle of 2 maps

Parameters:
  • xMap (qwt.scale_map.QwtScaleMap) – Maps x-values into pixel coordinates.
  • yMap (qwt.scale_map.QwtScaleMap) – Maps y-values into pixel coordinates.
Returns:

Bounding paint rectangle of the scale maps, not normalized
plot()
Returns:attached plot
rtti()

Return rtti for the specific class represented. QwtPlotItem is simply a virtual interface class, and base classes will implement this method with specific rtti values so a user can differentiate them.

Returns:rtti value
scaleRect(xMap, yMap)

Calculate the bounding scale rectangle of 2 maps

Parameters:
  • xMap (qwt.scale_map.QwtScaleMap) – Maps x-values into pixel coordinates.
  • yMap (qwt.scale_map.QwtScaleMap) – Maps y-values into pixel coordinates.
Returns:

Bounding scale rect of the scale maps, not normalized
select()

Select item

serialize(writer)

Serialize object to HDF5 writer

setAxes(xAxis, yAxis)

Set X and Y axis

The item will painted according to the coordinates of its Axes.

Parameters:
  • xAxis (int) – X Axis (QwtPlot.xBottom or QwtPlot.xTop)
  • yAxis (int) – Y Axis (QwtPlot.yLeft or QwtPlot.yRight)

See also

setXAxis(), setYAxis(), xAxis(), yAxis()

setAxis(xAxis, yAxis)

Set X and Y axis

Warning

setAxis has been removed in Qwt6: please use setAxes() instead

setItemAttribute(attribute, on=True)

Toggle an item attribute

Parameters:
  • attribute (int) – Attribute type
  • on (bool) – True/False

See also

testItemAttribute()

setItemInterest(interest, on=True)

Toggle an item interest

Parameters:
  • attribute (int) – Interest type
  • on (bool) – True/False

See also

testItemInterest()

setLegendIconSize(size)

Set the size of the legend icon

The default setting is 8x8 pixels

Parameters:size (QSize) – Size

See also

legendIconSize(), legendIcon()

setRenderHint(hint, on=True)

Toggle a render hint

Parameters:
  • hint (int) – Render hint
  • on (bool) – True/False

See also

testRenderHint()

setTitle(title)

Set a new title

Parameters:title (qwt.text.QwtText or str) – Title

See also

title()

setVisible(on)

Show/Hide the item

Parameters:on (bool) – Show if True, otherwise hide

See also

isVisible(), show(), hide()

setXAxis(axis)

Set the X axis

The item will painted according to the coordinates its Axes.

Parameters:axis (int) – X Axis (QwtPlot.xBottom or QwtPlot.xTop)

See also

setAxes(), setYAxis(), xAxis(), yAxis()

setYAxis(axis)

Set the Y axis

The item will painted according to the coordinates its Axes.

Parameters:axis (int) – Y Axis (QwtPlot.yLeft or QwtPlot.yRight)

See also

setAxes(), setXAxis(), xAxis(), yAxis()

setZ(z)

Set the z value

Plot items are painted in increasing z-order.

Parameters:z (float) – Z-value

See also

z(), QwtPlotDict.itemList()

set_movable(state)

Set item movable state

set_private(state)

Set object as private

set_readonly(state)

Set object readonly state

set_resizable(state)

Set item resizable state (or any action triggered when moving an handle, e.g. rotation)

set_rotatable(state)

Set item rotatable state

set_selectable(state)

Set item selectable state

show()

Show the item

testItemAttribute(attribute)

Test an item attribute

Parameters:attribute (int) – Attribute type
Returns:True/False

See also

setItemAttribute()

testItemInterest(interest)

Test an item interest

Parameters:attribute (int) – Interest type
Returns:True/False

See also

setItemInterest()

testRenderHint(hint)

Test a render hint

Parameters:attribute (int) – Render hint
Returns:True/False

See also

setRenderHint()

title()
Returns:Title of the item

See also

setTitle()

unselect()

Unselect item

updateLegend(item, data)

Update the item to changes of the legend info

Plot items that want to display a legend ( not those, that want to be displayed on a legend ! ) will have to implement updateLegend().

updateLegend() is only called when the LegendInterest interest is enabled. The default implementation does nothing.

Parameters:
  • item (qwt.plot.QwtPlotItem) – Plot item to be displayed on a legend
  • data (list) – Attributes how to display item on the legend

Note

Plot items, that want to be displayed on a legend need to enable the QwtPlotItem.Legend flag and to implement legendData() and legendIcon()

xAxis()
Returns:xAxis
yAxis()
Returns:yAxis
z()

Plot items are painted in increasing z-order.

Returns:item z order

See also

setZ(), QwtPlotDict.itemList()

class plotpy.label.SelectedLegendBoxItem(dataset=None, itemlist=None)[source]
attach(plot)

Attach the item to a plot.

This method will attach a QwtPlotItem to the QwtPlot argument. It will first detach the QwtPlotItem from any plot from a previous call to attach (if necessary). If a None argument is passed, it will detach from any QwtPlot it was attached to.

Parameters:plot (qwt.plot.QwtPlot) – Plot widget

See also

detach()

boundingRect()
Returns:An invalid bounding rect: QRectF(1.0, 1.0, -2.0, -2.0)

Note

A width or height < 0.0 is ignored by the autoscaler

defaultIcon(brush, size)

Return a default icon from a brush

The default icon is a filled rectangle used in several derived classes as legendIcon().

Parameters:
  • brush (QBrush) – Fill brush
  • size (QSizeF) – Icon size
Returns:

A filled rectangle
deserialize(reader)

Deserialize object from HDF5 reader

detach()

Detach the item from a plot.

This method detaches a QwtPlotItem from any QwtPlot it has been associated with.

See also

attach()

getCanvasMarginHint(xMap, yMap, canvasRect)

Calculate a hint for the canvas margin

When the QwtPlotItem::Margins flag is enabled the plot item indicates, that it needs some margins at the borders of the canvas. This is f.e. used by bar charts to reserve space for displaying the bars.

The margins are in target device coordinates ( pixels on screen )

Parameters:
  • xMap (qwt.scale_map.QwtScaleMap) – Maps x-values into pixel coordinates.
  • yMap (qwt.scale_map.QwtScaleMap) – Maps y-values into pixel coordinates.
  • canvasRect (QRectF) – Contents rectangle of the canvas in painter coordinates

See also

QwtPlot.getCanvasMarginsHint(), QwtPlot.updateCanvasMargins(),

hide()

Hide the item

isVisible()
Returns:True if visible

See also

setVisible(), show(), hide()

is_private()

Return True if object is private

is_readonly()

Return object readonly state

itemChanged()

Update the legend and call QwtPlot.autoRefresh() for the parent plot.

See also

QwtPlot.legendChanged(), QwtPlot.autoRefresh()

legendChanged()

Update the legend of the parent plot.

See also

QwtPlot.updateLegend(), itemChanged()

legendData()

Return all information, that is needed to represent the item on the legend

QwtLegendData is basically a list of QVariants that makes it possible to overload and reimplement legendData() to return almost any type of information, that is understood by the receiver that acts as the legend.

The default implementation returns one entry with the title() of the item and the legendIcon().

Returns:Data, that is needed to represent the item on the legend

See also

title(), legendIcon(), qwt.legend.QwtLegend

legendIcon(index, size)
Parameters:
  • index (int) – Index of the legend entry (usually there is only one)
  • size (QSizeF) – Icon size
Returns:

Icon representing the item on the legend

The default implementation returns an invalid icon

See also

setLegendIconSize(), legendData()

legendIconSize()
Returns:Legend icon size

See also

setLegendIconSize(), legendIcon()

move_local_point_to(handle, pos, ctrl=None)

Move a handle as returned by hit_test to the new position pos ctrl: True if <Ctrl> button is being pressed, False otherwise

move_local_shape(old_pos, new_pos)

Translate the shape such that old_pos becomes new_pos in canvas coordinates

move_with_selection(delta_x, delta_y)

Translate the shape together with other selected items delta_x, delta_y: translation in plot coordinates

paintRect(xMap, yMap)

Calculate the bounding paint rectangle of 2 maps

Parameters:
  • xMap (qwt.scale_map.QwtScaleMap) – Maps x-values into pixel coordinates.
  • yMap (qwt.scale_map.QwtScaleMap) – Maps y-values into pixel coordinates.
Returns:

Bounding paint rectangle of the scale maps, not normalized
plot()
Returns:attached plot
rtti()

Return rtti for the specific class represented. QwtPlotItem is simply a virtual interface class, and base classes will implement this method with specific rtti values so a user can differentiate them.

Returns:rtti value
scaleRect(xMap, yMap)

Calculate the bounding scale rectangle of 2 maps

Parameters:
  • xMap (qwt.scale_map.QwtScaleMap) – Maps x-values into pixel coordinates.
  • yMap (qwt.scale_map.QwtScaleMap) – Maps y-values into pixel coordinates.
Returns:

Bounding scale rect of the scale maps, not normalized
select()

Select item

serialize(writer)

Serialize object to HDF5 writer

setAxes(xAxis, yAxis)

Set X and Y axis

The item will painted according to the coordinates of its Axes.

Parameters:
  • xAxis (int) – X Axis (QwtPlot.xBottom or QwtPlot.xTop)
  • yAxis (int) – Y Axis (QwtPlot.yLeft or QwtPlot.yRight)

See also

setXAxis(), setYAxis(), xAxis(), yAxis()

setAxis(xAxis, yAxis)

Set X and Y axis

Warning

setAxis has been removed in Qwt6: please use setAxes() instead

setItemAttribute(attribute, on=True)

Toggle an item attribute

Parameters:
  • attribute (int) – Attribute type
  • on (bool) – True/False

See also

testItemAttribute()

setItemInterest(interest, on=True)

Toggle an item interest

Parameters:
  • attribute (int) – Interest type
  • on (bool) – True/False

See also

testItemInterest()

setLegendIconSize(size)

Set the size of the legend icon

The default setting is 8x8 pixels

Parameters:size (QSize) – Size

See also

legendIconSize(), legendIcon()

setRenderHint(hint, on=True)

Toggle a render hint

Parameters:
  • hint (int) – Render hint
  • on (bool) – True/False

See also

testRenderHint()

setTitle(title)

Set a new title

Parameters:title (qwt.text.QwtText or str) – Title

See also

title()

setVisible(on)

Show/Hide the item

Parameters:on (bool) – Show if True, otherwise hide

See also

isVisible(), show(), hide()

setXAxis(axis)

Set the X axis

The item will painted according to the coordinates its Axes.

Parameters:axis (int) – X Axis (QwtPlot.xBottom or QwtPlot.xTop)

See also

setAxes(), setYAxis(), xAxis(), yAxis()

setYAxis(axis)

Set the Y axis

The item will painted according to the coordinates its Axes.

Parameters:axis (int) – Y Axis (QwtPlot.yLeft or QwtPlot.yRight)

See also

setAxes(), setXAxis(), xAxis(), yAxis()

setZ(z)

Set the z value

Plot items are painted in increasing z-order.

Parameters:z (float) – Z-value

See also

z(), QwtPlotDict.itemList()

set_movable(state)

Set item movable state

set_private(state)

Set object as private

set_readonly(state)

Set object readonly state

set_resizable(state)

Set item resizable state (or any action triggered when moving an handle, e.g. rotation)

set_rotatable(state)

Set item rotatable state

set_selectable(state)

Set item selectable state

show()

Show the item

testItemAttribute(attribute)

Test an item attribute

Parameters:attribute (int) – Attribute type
Returns:True/False

See also

setItemAttribute()

testItemInterest(interest)

Test an item interest

Parameters:attribute (int) – Interest type
Returns:True/False

See also

setItemInterest()

testRenderHint(hint)

Test a render hint

Parameters:attribute (int) – Render hint
Returns:True/False

See also

setRenderHint()

title()
Returns:Title of the item

See also

setTitle()

unselect()

Unselect item

updateLegend(item, data)

Update the item to changes of the legend info

Plot items that want to display a legend ( not those, that want to be displayed on a legend ! ) will have to implement updateLegend().

updateLegend() is only called when the LegendInterest interest is enabled. The default implementation does nothing.

Parameters:
  • item (qwt.plot.QwtPlotItem) – Plot item to be displayed on a legend
  • data (list) – Attributes how to display item on the legend

Note

Plot items, that want to be displayed on a legend need to enable the QwtPlotItem.Legend flag and to implement legendData() and legendIcon()

xAxis()
Returns:xAxis
yAxis()
Returns:yAxis
z()

Plot items are painted in increasing z-order.

Returns:item z order

See also

setZ(), QwtPlotDict.itemList()

class plotpy.label.RangeComputation(label, curve, xrangeselection, function=None)[source]

ObjectInfo showing curve computations relative to a XRangeSelection shape.

label: formatted string curve: CurveItem object xrangeselection: XRangeSelection object function: input arguments are x, y arrays (extraction of arrays corresponding to the xrangeselection X-axis range)

class plotpy.label.RangeComputation2d(label, image, rect, function)[source]
class plotpy.label.DataInfoLabel(labelparam=None, infos=None)[source]
attach(plot)

Attach the item to a plot.

This method will attach a QwtPlotItem to the QwtPlot argument. It will first detach the QwtPlotItem from any plot from a previous call to attach (if necessary). If a None argument is passed, it will detach from any QwtPlot it was attached to.

Parameters:plot (qwt.plot.QwtPlot) – Plot widget

See also

detach()

boundingRect()
Returns:An invalid bounding rect: QRectF(1.0, 1.0, -2.0, -2.0)

Note

A width or height < 0.0 is ignored by the autoscaler

defaultIcon(brush, size)

Return a default icon from a brush

The default icon is a filled rectangle used in several derived classes as legendIcon().

Parameters:
  • brush (QBrush) – Fill brush
  • size (QSizeF) – Icon size
Returns:

A filled rectangle
deserialize(reader)

Deserialize object from HDF5 reader

detach()

Detach the item from a plot.

This method detaches a QwtPlotItem from any QwtPlot it has been associated with.

See also

attach()

getCanvasMarginHint(xMap, yMap, canvasRect)

Calculate a hint for the canvas margin

When the QwtPlotItem::Margins flag is enabled the plot item indicates, that it needs some margins at the borders of the canvas. This is f.e. used by bar charts to reserve space for displaying the bars.

The margins are in target device coordinates ( pixels on screen )

Parameters:
  • xMap (qwt.scale_map.QwtScaleMap) – Maps x-values into pixel coordinates.
  • yMap (qwt.scale_map.QwtScaleMap) – Maps y-values into pixel coordinates.
  • canvasRect (QRectF) – Contents rectangle of the canvas in painter coordinates

See also

QwtPlot.getCanvasMarginsHint(), QwtPlot.updateCanvasMargins(),

hide()

Hide the item

isVisible()
Returns:True if visible

See also

setVisible(), show(), hide()

is_private()

Return True if object is private

is_readonly()

Return object readonly state

itemChanged()

Update the legend and call QwtPlot.autoRefresh() for the parent plot.

See also

QwtPlot.legendChanged(), QwtPlot.autoRefresh()

legendChanged()

Update the legend of the parent plot.

See also

QwtPlot.updateLegend(), itemChanged()

legendData()

Return all information, that is needed to represent the item on the legend

QwtLegendData is basically a list of QVariants that makes it possible to overload and reimplement legendData() to return almost any type of information, that is understood by the receiver that acts as the legend.

The default implementation returns one entry with the title() of the item and the legendIcon().

Returns:Data, that is needed to represent the item on the legend

See also

title(), legendIcon(), qwt.legend.QwtLegend

legendIcon(index, size)
Parameters:
  • index (int) – Index of the legend entry (usually there is only one)
  • size (QSizeF) – Icon size
Returns:

Icon representing the item on the legend

The default implementation returns an invalid icon

See also

setLegendIconSize(), legendData()

legendIconSize()
Returns:Legend icon size

See also

setLegendIconSize(), legendIcon()

move_local_point_to(handle, pos, ctrl=None)

Move a handle as returned by hit_test to the new position pos ctrl: True if <Ctrl> button is being pressed, False otherwise

move_local_shape(old_pos, new_pos)

Translate the shape such that old_pos becomes new_pos in canvas coordinates

move_with_selection(delta_x, delta_y)

Translate the shape together with other selected items delta_x, delta_y: translation in plot coordinates

paintRect(xMap, yMap)

Calculate the bounding paint rectangle of 2 maps

Parameters:
  • xMap (qwt.scale_map.QwtScaleMap) – Maps x-values into pixel coordinates.
  • yMap (qwt.scale_map.QwtScaleMap) – Maps y-values into pixel coordinates.
Returns:

Bounding paint rectangle of the scale maps, not normalized
plot()
Returns:attached plot
rtti()

Return rtti for the specific class represented. QwtPlotItem is simply a virtual interface class, and base classes will implement this method with specific rtti values so a user can differentiate them.

Returns:rtti value
scaleRect(xMap, yMap)

Calculate the bounding scale rectangle of 2 maps

Parameters:
  • xMap (qwt.scale_map.QwtScaleMap) – Maps x-values into pixel coordinates.
  • yMap (qwt.scale_map.QwtScaleMap) – Maps y-values into pixel coordinates.
Returns:

Bounding scale rect of the scale maps, not normalized
select()

Select item

serialize(writer)

Serialize object to HDF5 writer

setAxes(xAxis, yAxis)

Set X and Y axis

The item will painted according to the coordinates of its Axes.

Parameters:
  • xAxis (int) – X Axis (QwtPlot.xBottom or QwtPlot.xTop)
  • yAxis (int) – Y Axis (QwtPlot.yLeft or QwtPlot.yRight)

See also

setXAxis(), setYAxis(), xAxis(), yAxis()

setAxis(xAxis, yAxis)

Set X and Y axis

Warning

setAxis has been removed in Qwt6: please use setAxes() instead

setItemAttribute(attribute, on=True)

Toggle an item attribute

Parameters:
  • attribute (int) – Attribute type
  • on (bool) – True/False

See also

testItemAttribute()

setItemInterest(interest, on=True)

Toggle an item interest

Parameters:
  • attribute (int) – Interest type
  • on (bool) – True/False

See also

testItemInterest()

setLegendIconSize(size)

Set the size of the legend icon

The default setting is 8x8 pixels

Parameters:size (QSize) – Size

See also

legendIconSize(), legendIcon()

setRenderHint(hint, on=True)

Toggle a render hint

Parameters:
  • hint (int) – Render hint
  • on (bool) – True/False

See also

testRenderHint()

setTitle(title)

Set a new title

Parameters:title (qwt.text.QwtText or str) – Title

See also

title()

setVisible(on)

Show/Hide the item

Parameters:on (bool) – Show if True, otherwise hide

See also

isVisible(), show(), hide()

setXAxis(axis)

Set the X axis

The item will painted according to the coordinates its Axes.

Parameters:axis (int) – X Axis (QwtPlot.xBottom or QwtPlot.xTop)

See also

setAxes(), setYAxis(), xAxis(), yAxis()

setYAxis(axis)

Set the Y axis

The item will painted according to the coordinates its Axes.

Parameters:axis (int) – Y Axis (QwtPlot.yLeft or QwtPlot.yRight)

See also

setAxes(), setXAxis(), xAxis(), yAxis()

setZ(z)

Set the z value

Plot items are painted in increasing z-order.

Parameters:z (float) – Z-value

See also

z(), QwtPlotDict.itemList()

set_movable(state)

Set item movable state

set_private(state)

Set object as private

set_readonly(state)

Set object readonly state

set_resizable(state)

Set item resizable state (or any action triggered when moving an handle, e.g. rotation)

set_rotatable(state)

Set item rotatable state

set_selectable(state)

Set item selectable state

show()

Show the item

testItemAttribute(attribute)

Test an item attribute

Parameters:attribute (int) – Attribute type
Returns:True/False

See also

setItemAttribute()

testItemInterest(interest)

Test an item interest

Parameters:attribute (int) – Interest type
Returns:True/False

See also

setItemInterest()

testRenderHint(hint)

Test a render hint

Parameters:attribute (int) – Render hint
Returns:True/False

See also

setRenderHint()

title()
Returns:Title of the item

See also

setTitle()

unselect()

Unselect item

updateLegend(item, data)

Update the item to changes of the legend info

Plot items that want to display a legend ( not those, that want to be displayed on a legend ! ) will have to implement updateLegend().

updateLegend() is only called when the LegendInterest interest is enabled. The default implementation does nothing.

Parameters:
  • item (qwt.plot.QwtPlotItem) – Plot item to be displayed on a legend
  • data (list) – Attributes how to display item on the legend

Note

Plot items, that want to be displayed on a legend need to enable the QwtPlotItem.Legend flag and to implement legendData() and legendIcon()

xAxis()
Returns:xAxis
yAxis()
Returns:yAxis
z()

Plot items are painted in increasing z-order.

Returns:item z order

See also

setZ(), QwtPlotDict.itemList()