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"""This module provides the :class:`Shape` item of the :class:`Plot`.
"""
__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "21/12/2018"
import logging
import numpy
from .core import (
Item,
DataItem,
AlphaMixIn,
ColorMixIn,
FillMixIn,
ItemChangedType,
LineMixIn,
LineGapColorMixIn,
YAxisMixIn,
)
from ....utils.deprecation import deprecated
_logger = logging.getLogger(__name__)
class _OverlayItem(Item):
"""Item with settable overlay"""
def __init__(self):
self.__overlay = False
Item.__init__(self)
def isOverlay(self) -> bool:
"""Return true if shape is drawn as an overlay"""
return self.__overlay
def setOverlay(self, overlay: bool):
"""Set the overlay state of the shape
:param overlay: True to make it an overlay
"""
overlay = bool(overlay)
if overlay != self.__overlay:
self.__overlay = overlay
self._updated(ItemChangedType.OVERLAY)
class _TwoColorsLineMixIn(LineMixIn, LineGapColorMixIn):
"""Mix-in class for items with a background color for dashes"""
def __init__(self):
LineMixIn.__init__(self)
LineGapColorMixIn.__init__(self)
@deprecated(replacement="getLineGapColor", since_version="2.0.0")
def getLineBgColor(self):
return self.getLineGapColor()
@deprecated(replacement="setLineGapColor", since_version="2.0.0")
def setLineBgColor(self, color, copy: bool = True):
self.setLineGapColor(color)
self._updated(ItemChangedType.LINE_BG_COLOR)
# TODO probably make one class for each kind of shape
# TODO check fill:polygon/polyline + fill = duplicated
[docs]
class Shape(_OverlayItem, ColorMixIn, FillMixIn, _TwoColorsLineMixIn):
"""Description of a shape item
:param str type_: The type of shape in:
'hline', 'polygon', 'rectangle', 'vline', 'polylines'
"""
def __init__(self, type_):
_OverlayItem.__init__(self)
ColorMixIn.__init__(self)
FillMixIn.__init__(self)
_TwoColorsLineMixIn.__init__(self)
assert type_ in ("hline", "polygon", "rectangle", "vline", "polylines")
self._type = type_
self._points = ()
self._handle = None
def _addBackendRenderer(self, backend):
"""Update backend renderer"""
points = self.getPoints(copy=False)
x, y = points.T[0], points.T[1]
return backend.addShape(
x,
y,
shape=self.getType(),
color=self.getColor(),
fill=self.isFill(),
overlay=self.isOverlay(),
linestyle=self.getLineStyle(),
linewidth=self.getLineWidth(),
gapcolor=self.getLineGapColor(),
)
[docs]
def getType(self):
"""Returns the type of shape to draw.
One of: 'hline', 'polygon', 'rectangle', 'vline', 'polylines'
:rtype: str
"""
return self._type
[docs]
def getPoints(self, copy=True):
"""Get the control points of the shape.
:param bool copy: True (Default) to get a copy,
False to use internal representation (do not modify!)
:return: Array of point coordinates
:rtype: numpy.ndarray with 2 dimensions
"""
return numpy.array(self._points, copy=copy)
[docs]
def setPoints(self, points, copy=True):
"""Set the point coordinates
:param numpy.ndarray points: Array of point coordinates
:param bool copy: True (Default) to get a copy,
False to use internal representation (do not modify!)
:return:
"""
self._points = numpy.array(points, copy=copy)
self._updated(ItemChangedType.DATA)
class BoundingRect(DataItem, YAxisMixIn):
"""An invisible shape which enforce the plot view to display the defined
space on autoscale.
This item do not display anything. But if the visible property is true,
this bounding box is used by the plot, if not, the bounding box is
ignored. That's the default behaviour for plot items.
It can be applied on the "left" or "right" axes. Not both at the same time.
"""
def __init__(self):
DataItem.__init__(self)
YAxisMixIn.__init__(self)
self.__bounds = None
def setBounds(self, rect):
"""Set the bounding box of this item in data coordinates
:param Union[None,List[float]] rect: (xmin, xmax, ymin, ymax) or None
"""
if rect is not None:
rect = float(rect[0]), float(rect[1]), float(rect[2]), float(rect[3])
assert rect[0] <= rect[1]
assert rect[2] <= rect[3]
if rect != self.__bounds:
self.__bounds = rect
self._boundsChanged()
self._updated(ItemChangedType.DATA)
def _getBounds(self):
if self.__bounds is None:
return None
plot = self.getPlot()
if plot is not None:
xPositive = plot.getXAxis()._isLogarithmic()
yPositive = plot.getYAxis()._isLogarithmic()
if xPositive or yPositive:
bounds = list(self.__bounds)
if xPositive and bounds[1] <= 0:
return None
if xPositive and bounds[0] <= 0:
bounds[0] = bounds[1]
if yPositive and bounds[3] <= 0:
return None
if yPositive and bounds[2] <= 0:
bounds[2] = bounds[3]
return tuple(bounds)
return self.__bounds
class _BaseExtent(DataItem):
"""Base class for :class:`XAxisExtent` and :class:`YAxisExtent`.
:param str axis: Either 'x' or 'y'.
"""
def __init__(self, axis="x"):
assert axis in ("x", "y")
DataItem.__init__(self)
self.__axis = axis
self.__range = 1.0, 100.0
def setRange(self, min_, max_):
"""Set the range of the extent of this item in data coordinates.
:param float min_: Lower bound of the extent
:param float max_: Upper bound of the extent
:raises ValueError: If min > max or not finite bounds
"""
range_ = float(min_), float(max_)
if not numpy.all(numpy.isfinite(range_)):
raise ValueError("min_ and max_ must be finite numbers.")
if range_[0] > range_[1]:
raise ValueError("min_ must be lesser or equal to max_")
if range_ != self.__range:
self.__range = range_
self._boundsChanged()
self._updated(ItemChangedType.DATA)
def getRange(self):
"""Returns the range (min, max) of the extent in data coordinates.
:rtype: List[float]
"""
return self.__range
def _getBounds(self):
min_, max_ = self.getRange()
plot = self.getPlot()
if plot is not None:
axis = plot.getXAxis() if self.__axis == "x" else plot.getYAxis()
if axis._isLogarithmic():
if max_ <= 0:
return None
if min_ <= 0:
min_ = max_
if self.__axis == "x":
return min_, max_, float("nan"), float("nan")
else:
return float("nan"), float("nan"), min_, max_
class XAxisExtent(_BaseExtent):
"""Invisible item with a settable horizontal data extent.
This item do not display anything, but it behaves as a data
item with a horizontal extent regarding plot data bounds, i.e.,
:meth:`PlotWidget.resetZoom` will take this horizontal extent into account.
"""
def __init__(self):
_BaseExtent.__init__(self, axis="x")
class YAxisExtent(_BaseExtent, YAxisMixIn):
"""Invisible item with a settable vertical data extent.
This item do not display anything, but it behaves as a data
item with a vertical extent regarding plot data bounds, i.e.,
:meth:`PlotWidget.resetZoom` will take this vertical extent into account.
"""
def __init__(self):
_BaseExtent.__init__(self, axis="y")
YAxisMixIn.__init__(self)
class Line(_OverlayItem, AlphaMixIn, ColorMixIn, _TwoColorsLineMixIn):
"""Description of a infinite line item as y = slope * x + interecpt
Warning: If slope is not finite, then the line is x = intercept.
"""
def __init__(self, slope: float = 0, intercept: float = 0):
assert numpy.isfinite(intercept)
_OverlayItem.__init__(self)
AlphaMixIn.__init__(self)
ColorMixIn.__init__(self)
_TwoColorsLineMixIn.__init__(self)
self.__slope = float(slope)
self.__intercept = float(intercept)
self.__coordinates = None
self._setVisibleBoundsTracking(True)
def __updatePoints(self):
if not self.isVisible():
return
plot = self.getPlot()
if plot is None or not plot.isVisible():
return
xmin, xmax = plot.getXAxis().getLimits()
ymin, ymax = plot.getYAxis().getLimits()
slope = self.getSlope()
intercept = self.getIntercept()
if not numpy.isfinite(slope):
if not xmin <= intercept <= xmax:
coordinates = None
else:
coordinates = (intercept, intercept), (ymin, ymax)
else:
ycoords = slope * xmin + intercept, slope * xmax + intercept
if min(ycoords) < ymax and max(ycoords) > ymin:
coordinates = (xmin, xmax), ycoords
else:
coordinates = None
if coordinates != self.__coordinates:
self.__coordinates = coordinates
self._updated()
def _visibleBoundsChanged(self, *args) -> None:
"""Override method to benefit from bounds tracking"""
self.__updatePoints()
return super()._visibleBoundsChanged(*args)
def setSlope(self, slope: float):
slope = float(slope)
if slope != self.__slope:
self.__slope = slope
self.__updatePoints()
self._updated(ItemChangedType.DATA)
def getSlope(self) -> float:
return self.__slope
def setIntercept(self, intercept: float):
intercept = float(intercept)
assert numpy.isfinite(intercept)
if intercept != self.__intercept:
self.__intercept = intercept
self.__updatePoints()
self._updated(ItemChangedType.DATA)
def getIntercept(self) -> float:
return self.__intercept
def setSlopeInterceptFromPoints(self, point0, point1):
"""Set slope and intercept from 2 (x, y) points"""
x0, y0 = point0
x1, y1 = point1
if x0 == x1: # Special case: vertical line
self.setSlope(float("inf"))
self.setIntercept(x0)
return
slope = (y1 - y0) / (x1 - x0)
self.setSlope(slope)
self.setIntercept(y0 - x0 * slope)
def _addBackendRenderer(self, backend):
"""Update backend renderer"""
if self.__coordinates is None:
return None
return backend.addShape(
*self.__coordinates,
shape="polylines",
color=self.getColor(),
fill=False,
overlay=self.isOverlay(),
linestyle=self.getLineStyle(),
linewidth=self.getLineWidth(),
gapcolor=self.getLineGapColor(),
)
