Source code for silx.gui.plot.items.shape

# coding: utf-8
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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
import six

from ... import colors
from .core import Item, ColorMixIn, FillMixIn, ItemChangedType, LineMixIn, YAxisMixIn


_logger = logging.getLogger(__name__)


# TODO probably make one class for each kind of shape
# TODO check fill:polygon/polyline + fill = duplicated
[docs]class Shape(Item, ColorMixIn, FillMixIn, LineMixIn): """Description of a shape item :param str type_: The type of shape in: 'hline', 'polygon', 'rectangle', 'vline', 'polylines' """ def __init__(self, type_): Item.__init__(self) ColorMixIn.__init__(self) FillMixIn.__init__(self) LineMixIn.__init__(self) self._overlay = False assert type_ in ('hline', 'polygon', 'rectangle', 'vline', 'polylines') self._type = type_ self._points = () self._lineBgColor = None 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.addItem(x, y, shape=self.getType(), color=self.getColor(), fill=self.isFill(), overlay=self.isOverlay(), z=self.getZValue(), linestyle=self.getLineStyle(), linewidth=self.getLineWidth(), linebgcolor=self.getLineBgColor()) def isOverlay(self): """Return true if shape is drawn as an overlay :rtype: bool """ return self._overlay
[docs] def setOverlay(self, overlay): """Set the overlay state of the shape :param bool overlay: True to make it an overlay """ overlay = bool(overlay) if overlay != self._overlay: self._overlay = overlay self._updated(ItemChangedType.OVERLAY)
[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)
def getLineBgColor(self): """Returns the RGBA color of the item :rtype: 4-tuple of float in [0, 1] or array of colors """ return self._lineBgColor def setLineBgColor(self, color, copy=True): """Set item color :param color: color(s) to be used :type color: str ("#RRGGBB") or (npoints, 4) unsigned byte array or one of the predefined color names defined in colors.py :param bool copy: True (Default) to get a copy, False to use internal representation (do not modify!) """ if color is not None: if isinstance(color, six.string_types): color = colors.rgba(color) else: color = numpy.array(color, copy=copy) # TODO more checks + improve color array support if color.ndim == 1: # Single RGBA color color = colors.rgba(color) else: # Array of colors assert color.ndim == 2 self._lineBgColor = color self._updated(ItemChangedType.LINE_BG_COLOR)
class BoundingRect(Item, 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): Item.__init__(self) YAxisMixIn.__init__(self) self.__bounds = None def _updated(self, event=None, checkVisibility=True): if event in (ItemChangedType.YAXIS, ItemChangedType.VISIBLE, ItemChangedType.DATA): # TODO hackish data range implementation plot = self.getPlot() if plot is not None: plot._invalidateDataRange() super(BoundingRect, self)._updated(event, checkVisibility) 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._updated(ItemChangedType.DATA) def _getBounds(self): 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