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Diffstat (limited to 'silx/gui/plot/tools/PositionInfo.py')
| -rw-r--r-- | silx/gui/plot/tools/PositionInfo.py | 347 |
1 files changed, 347 insertions, 0 deletions
diff --git a/silx/gui/plot/tools/PositionInfo.py b/silx/gui/plot/tools/PositionInfo.py new file mode 100644 index 0000000..83b61bd --- /dev/null +++ b/silx/gui/plot/tools/PositionInfo.py @@ -0,0 +1,347 @@ +# coding: utf-8 +# /*########################################################################## +# +# Copyright (c) 2016-2018 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 a widget displaying mouse coordinates in a PlotWidget. + +It can be configured to provide more information. +""" + +from __future__ import division + +__authors__ = ["V.A. Sole", "T. Vincent"] +__license__ = "MIT" +__date__ = "16/10/2017" + + +import logging +import numbers +import traceback +import weakref + +import numpy + +from ....utils.deprecation import deprecated +from ... import qt +from .. import items + + +_logger = logging.getLogger(__name__) + + +# PositionInfo ################################################################ + +class PositionInfo(qt.QWidget): + """QWidget displaying coords converted from data coords of the mouse. + + Provide this widget with a list of couple: + + - A name to display before the data + - A function that takes (x, y) as arguments and returns something that + gets converted to a string. + If the result is a float it is converted with '%.7g' format. + + To run the following sample code, a QApplication must be initialized. + First, create a PlotWindow and add a QToolBar where to place the + PositionInfo widget. + + >>> from silx.gui.plot import PlotWindow + >>> from silx.gui import qt + + >>> plot = PlotWindow() # Create a PlotWindow to add the widget to + >>> toolBar = qt.QToolBar() # Create a toolbar to place the widget in + >>> plot.addToolBar(qt.Qt.BottomToolBarArea, toolBar) # Add it to plot + + Then, create the PositionInfo widget and add it to the toolbar. + The PositionInfo widget is created with a list of converters, here + to display polar coordinates of the mouse position. + + >>> import numpy + >>> from silx.gui.plot.tools import PositionInfo + + >>> position = PositionInfo(plot=plot, converters=[ + ... ('Radius', lambda x, y: numpy.sqrt(x*x + y*y)), + ... ('Angle', lambda x, y: numpy.degrees(numpy.arctan2(y, x)))]) + >>> toolBar.addWidget(position) # Add the widget to the toolbar + <...> + >>> plot.show() # To display the PlotWindow with the position widget + + :param plot: The PlotWidget this widget is displaying data coords from. + :param converters: + List of 2-tuple: name to display and conversion function from (x, y) + in data coords to displayed value. + If None, the default, it displays X and Y. + :param parent: Parent widget + """ + + SNAP_THRESHOLD_DIST = 5 + + def __init__(self, parent=None, plot=None, converters=None): + assert plot is not None + self._plotRef = weakref.ref(plot) + self._snappingMode = self.SNAPPING_DISABLED + + super(PositionInfo, self).__init__(parent) + + if converters is None: + converters = (('X', lambda x, y: x), ('Y', lambda x, y: y)) + + self._fields = [] # To store (QLineEdit, name, function (x, y)->v) + + # Create a new layout with new widgets + layout = qt.QHBoxLayout() + layout.setContentsMargins(0, 0, 0, 0) + # layout.setSpacing(0) + + # Create all QLabel and store them with the corresponding converter + for name, func in converters: + layout.addWidget(qt.QLabel('<b>' + name + ':</b>')) + + contentWidget = qt.QLabel() + contentWidget.setText('------') + contentWidget.setTextInteractionFlags(qt.Qt.TextSelectableByMouse) + contentWidget.setFixedWidth( + contentWidget.fontMetrics().width('##############')) + layout.addWidget(contentWidget) + self._fields.append((contentWidget, name, func)) + + layout.addStretch(1) + self.setLayout(layout) + + # Connect to Plot events + plot.sigPlotSignal.connect(self._plotEvent) + + def getPlotWidget(self): + """Returns the PlotWidget this widget is attached to or None. + + :rtype: Union[~silx.gui.plot.PlotWidget,None] + """ + return self._plotRef() + + @property + @deprecated(replacement='getPlotWidget', since_version='0.8.0') + def plot(self): + return self.getPlotWidget() + + def getConverters(self): + """Return the list of converters as 2-tuple (name, function).""" + return [(name, func) for _label, name, func in self._fields] + + def _plotEvent(self, event): + """Handle events from the Plot. + + :param dict event: Plot event + """ + if event['event'] == 'mouseMoved': + x, y = event['x'], event['y'] + xPixel, yPixel = event['xpixel'], event['ypixel'] + self._updateStatusBar(x, y, xPixel, yPixel) + + def updateInfo(self): + """Update displayed information""" + plot = self.getPlotWidget() + if plot is None: + _logger.error("Trying to update PositionInfo " + "while PlotWidget no longer exists") + return + + widget = plot.getWidgetHandle() + position = widget.mapFromGlobal(qt.QCursor.pos()) + xPixel, yPixel = position.x(), position.y() + dataPos = plot.pixelToData(xPixel, yPixel, check=True) + if dataPos is not None: # Inside plot area + x, y = dataPos + self._updateStatusBar(x, y, xPixel, yPixel) + + def _updateStatusBar(self, x, y, xPixel, yPixel): + """Update information from the status bar using the definitions. + + :param float x: Position-x in data + :param float y: Position-y in data + :param float xPixel: Position-x in pixels + :param float yPixel: Position-y in pixels + """ + plot = self.getPlotWidget() + if plot is None: + return + + styleSheet = "color: rgb(0, 0, 0);" # Default style + xData, yData = x, y + + snappingMode = self.getSnappingMode() + + # Snapping when crosshair either not requested or active + if (snappingMode & (self.SNAPPING_CURVE | self.SNAPPING_SCATTER) and + (not (snappingMode & self.SNAPPING_CROSSHAIR) or + plot.getGraphCursor())): + styleSheet = "color: rgb(255, 0, 0);" # Style far from item + + if snappingMode & self.SNAPPING_ACTIVE_ONLY: + selectedItems = [] + + if snappingMode & self.SNAPPING_CURVE: + activeCurve = plot.getActiveCurve() + if activeCurve: + selectedItems.append(activeCurve) + + if snappingMode & self.SNAPPING_SCATTER: + activeScatter = plot._getActiveItem(kind='scatter') + if activeScatter: + selectedItems.append(activeScatter) + + else: + kinds = [] + if snappingMode & self.SNAPPING_CURVE: + kinds.append('curve') + if snappingMode & self.SNAPPING_SCATTER: + kinds.append('scatter') + selectedItems = plot._getItems(kind=kinds) + + # Compute distance threshold + if qt.BINDING in ('PyQt5', 'PySide2'): + window = plot.window() + windowHandle = window.windowHandle() + if windowHandle is not None: + ratio = windowHandle.devicePixelRatio() + else: + ratio = qt.QGuiApplication.primaryScreen().devicePixelRatio() + else: + ratio = 1. + + # Baseline squared distance threshold + distInPixels = (self.SNAP_THRESHOLD_DIST * ratio)**2 + + for item in selectedItems: + if (snappingMode & self.SNAPPING_SYMBOLS_ONLY and + not item.getSymbol()): + # Only handled if item symbols are visible + continue + + xArray = item.getXData(copy=False) + yArray = item.getYData(copy=False) + closestIndex = numpy.argmin( + pow(xArray - x, 2) + pow(yArray - y, 2)) + + xClosest = xArray[closestIndex] + yClosest = yArray[closestIndex] + + if isinstance(item, items.YAxisMixIn): + axis = item.getYAxis() + else: + axis = 'left' + + closestInPixels = plot.dataToPixel( + xClosest, yClosest, axis=axis) + if closestInPixels is not None: + curveDistInPixels = ( + (closestInPixels[0] - xPixel)**2 + + (closestInPixels[1] - yPixel)**2) + + if curveDistInPixels <= distInPixels: + # Update label style sheet + styleSheet = "color: rgb(0, 0, 0);" + + # if close enough, snap to data point coord + xData, yData = xClosest, yClosest + distInPixels = curveDistInPixels + + for label, name, func in self._fields: + label.setStyleSheet(styleSheet) + + try: + value = func(xData, yData) + text = self.valueToString(value) + label.setText(text) + except: + label.setText('Error') + _logger.error( + "Error while converting coordinates (%f, %f)" + "with converter '%s'" % (xPixel, yPixel, name)) + _logger.error(traceback.format_exc()) + + def valueToString(self, value): + if isinstance(value, (tuple, list)): + value = [self.valueToString(v) for v in value] + return ", ".join(value) + elif isinstance(value, numbers.Real): + # Use this for floats and int + return '%.7g' % value + else: + # Fallback for other types + return str(value) + + # Snapping mode + + SNAPPING_DISABLED = 0 + """No snapping occurs""" + + SNAPPING_CROSSHAIR = 1 << 0 + """Snapping only enabled when crosshair cursor is enabled""" + + SNAPPING_ACTIVE_ONLY = 1 << 1 + """Snapping only enabled for active item""" + + SNAPPING_SYMBOLS_ONLY = 1 << 2 + """Snapping only when symbols are visible""" + + SNAPPING_CURVE = 1 << 3 + """Snapping on curves""" + + SNAPPING_SCATTER = 1 << 4 + """Snapping on scatter""" + + def setSnappingMode(self, mode): + """Set the snapping mode. + + The mode is a mask. + + :param int mode: The mode to use + """ + if mode != self._snappingMode: + self._snappingMode = mode + self.updateInfo() + + def getSnappingMode(self): + """Returns the snapping mode as a mask + + :rtype: int + """ + return self._snappingMode + + _SNAPPING_LEGACY = (SNAPPING_CROSSHAIR | + SNAPPING_ACTIVE_ONLY | + SNAPPING_SYMBOLS_ONLY | + SNAPPING_CURVE | + SNAPPING_SCATTER) + """Legacy snapping mode""" + + @property + @deprecated(replacement="getSnappingMode", since_version="0.8") + def autoSnapToActiveCurve(self): + return self.getSnappingMode() == self._SNAPPING_LEGACY + + @autoSnapToActiveCurve.setter + @deprecated(replacement="setSnappingMode", since_version="0.8") + def autoSnapToActiveCurve(self, flag): + self.setSnappingMode( + self._SNAPPING_LEGACY if flag else self.SNAPPING_DISABLED) |