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Diffstat (limited to 'src/silx/gui/plot/items/marker.py')
| -rwxr-xr-x | src/silx/gui/plot/items/marker.py | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/src/silx/gui/plot/items/marker.py b/src/silx/gui/plot/items/marker.py new file mode 100755 index 0000000..50d070c --- /dev/null +++ b/src/silx/gui/plot/items/marker.py @@ -0,0 +1,281 @@ +# coding: utf-8 +# /*########################################################################## +# +# Copyright (c) 2017-2020 European Synchrotron Radiation Facility +# +# Permission is hereby granted, free of charge, to any person obtaining a copy +# of this software and associated documentation files (the "Software"), to deal +# in the Software without restriction, including without limitation the rights +# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +# copies of the Software, and to permit persons to whom the Software is +# furnished to do so, subject to the following conditions: +# +# The above copyright notice and this permission notice shall be included in +# all copies or substantial portions of the Software. +# +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +# THE SOFTWARE. +# +# ###########################################################################*/ +"""This module provides markers item of the :class:`Plot`. +""" + +__authors__ = ["T. Vincent"] +__license__ = "MIT" +__date__ = "06/03/2017" + + +import logging + +from ....utils.proxy import docstring +from .core import (Item, DraggableMixIn, ColorMixIn, LineMixIn, SymbolMixIn, + ItemChangedType, YAxisMixIn) +from silx.gui import qt + +_logger = logging.getLogger(__name__) + + +class MarkerBase(Item, DraggableMixIn, ColorMixIn, YAxisMixIn): + """Base class for markers""" + + sigDragStarted = qt.Signal() + """Signal emitted when the marker is pressed""" + sigDragFinished = qt.Signal() + """Signal emitted when the marker is released""" + + _DEFAULT_COLOR = (0., 0., 0., 1.) + """Default color of the markers""" + + def __init__(self): + Item.__init__(self) + DraggableMixIn.__init__(self) + ColorMixIn.__init__(self) + YAxisMixIn.__init__(self) + + self._text = '' + self._x = None + self._y = None + self._constraint = self._defaultConstraint + self.__isBeingDragged = False + + def _addRendererCall(self, backend, + symbol=None, linestyle='-', linewidth=1): + """Perform the update of the backend renderer""" + return backend.addMarker( + x=self.getXPosition(), + y=self.getYPosition(), + text=self.getText(), + color=self.getColor(), + symbol=symbol, + linestyle=linestyle, + linewidth=linewidth, + constraint=self.getConstraint(), + yaxis=self.getYAxis()) + + def _addBackendRenderer(self, backend): + """Update backend renderer""" + raise NotImplementedError() + + @docstring(DraggableMixIn) + def drag(self, from_, to): + self.setPosition(to[0], to[1]) + + def isOverlay(self): + """Returns True: A marker is always rendered as an overlay. + + :rtype: bool + """ + return True + + def getText(self): + """Returns marker text. + + :rtype: str + """ + return self._text + + def setText(self, text): + """Set the text of the marker. + + :param str text: The text to use + """ + text = str(text) + if text != self._text: + self._text = text + self._updated(ItemChangedType.TEXT) + + def getXPosition(self): + """Returns the X position of the marker line in data coordinates + + :rtype: float or None + """ + return self._x + + def getYPosition(self): + """Returns the Y position of the marker line in data coordinates + + :rtype: float or None + """ + return self._y + + def getPosition(self): + """Returns the (x, y) position of the marker in data coordinates + + :rtype: 2-tuple of float or None + """ + return self._x, self._y + + def setPosition(self, x, y): + """Set marker position in data coordinates + + Constraint are applied if any. + + :param float x: X coordinates in data frame + :param float y: Y coordinates in data frame + """ + x, y = self.getConstraint()(x, y) + x, y = float(x), float(y) + if x != self._x or y != self._y: + self._x, self._y = x, y + self._updated(ItemChangedType.POSITION) + + def getConstraint(self): + """Returns the dragging constraint of this item""" + return self._constraint + + def _setConstraint(self, constraint): # TODO support update + """Set the constraint. + + This is private for now as update is not handled. + + :param callable constraint: + :param constraint: A function filtering item displacement by + dragging operations or None for no filter. + This function is called each time the item is + moved. + This is only used if isDraggable returns True. + :type constraint: None or a callable that takes the coordinates of + the current cursor position in the plot as input + and that returns the filtered coordinates. + """ + if constraint is None: + constraint = self._defaultConstraint + assert callable(constraint) + self._constraint = constraint + + @staticmethod + def _defaultConstraint(*args): + """Default constraint not doing anything""" + return args + + def _startDrag(self): + self.__isBeingDragged = True + self.sigDragStarted.emit() + + def _endDrag(self): + self.__isBeingDragged = False + self.sigDragFinished.emit() + + def isBeingDragged(self) -> bool: + """Returns whether the marker is currently dragged by the user.""" + return self.__isBeingDragged + + +class Marker(MarkerBase, SymbolMixIn): + """Description of a marker""" + + _DEFAULT_SYMBOL = '+' + """Default symbol of the marker""" + + def __init__(self): + MarkerBase.__init__(self) + SymbolMixIn.__init__(self) + + self._x = 0. + self._y = 0. + + def _addBackendRenderer(self, backend): + return self._addRendererCall(backend, symbol=self.getSymbol()) + + def _setConstraint(self, constraint): + """Set the constraint function of the marker drag. + + It also supports 'horizontal' and 'vertical' str as constraint. + + :param constraint: The constraint of the dragging of this marker + :type: constraint: callable or str + """ + if constraint == 'horizontal': + constraint = self._horizontalConstraint + elif constraint == 'vertical': + constraint = self._verticalConstraint + + super(Marker, self)._setConstraint(constraint) + + def _horizontalConstraint(self, _, y): + return self.getXPosition(), y + + def _verticalConstraint(self, x, _): + return x, self.getYPosition() + + +class _LineMarker(MarkerBase, LineMixIn): + """Base class for line markers""" + + def __init__(self): + MarkerBase.__init__(self) + LineMixIn.__init__(self) + + def _addBackendRenderer(self, backend): + return self._addRendererCall(backend, + linestyle=self.getLineStyle(), + linewidth=self.getLineWidth()) + + +class XMarker(_LineMarker): + """Description of a marker""" + + def __init__(self): + _LineMarker.__init__(self) + self._x = 0. + + def setPosition(self, x, y): + """Set marker line position in data coordinates + + Constraint are applied if any. + + :param float x: X coordinates in data frame + :param float y: Y coordinates in data frame + """ + x, _ = self.getConstraint()(x, y) + x = float(x) + if x != self._x: + self._x = x + self._updated(ItemChangedType.POSITION) + + +class YMarker(_LineMarker): + """Description of a marker""" + + def __init__(self): + _LineMarker.__init__(self) + self._y = 0. + + def setPosition(self, x, y): + """Set marker line position in data coordinates + + Constraint are applied if any. + + :param float x: X coordinates in data frame + :param float y: Y coordinates in data frame + """ + _, y = self.getConstraint()(x, y) + y = float(y) + if y != self._y: + self._y = y + self._updated(ItemChangedType.POSITION) |