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Diffstat (limited to 'silx/gui/plot/backends/BackendBase.py')
| -rw-r--r-- | silx/gui/plot/backends/BackendBase.py | 474 |
1 files changed, 474 insertions, 0 deletions
diff --git a/silx/gui/plot/backends/BackendBase.py b/silx/gui/plot/backends/BackendBase.py new file mode 100644 index 0000000..74f96af --- /dev/null +++ b/silx/gui/plot/backends/BackendBase.py @@ -0,0 +1,474 @@ +# coding: utf-8 +# /*########################################################################## +# +# Copyright (c) 2004-2017 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. +# +# ############################################################################*/ +"""Base class for Plot backends. + +It documents the Plot backend API. + +This API is a simplified version of PyMca PlotBackend API. +""" + +__authors__ = ["V.A. Sole", "T. Vincent"] +__license__ = "MIT" +__date__ = "18/02/2016" + + +import weakref + + +# Names for setCursor +CURSOR_DEFAULT = 'default' +CURSOR_POINTING = 'pointing' +CURSOR_SIZE_HOR = 'size horizontal' +CURSOR_SIZE_VER = 'size vertical' +CURSOR_SIZE_ALL = 'size all' + + +class BackendBase(object): + """Class defining the API a backend of the Plot should provide.""" + + def __init__(self, plot, parent=None): + """Init. + + :param Plot plot: The Plot this backend is attached to + :param parent: The parent widget of the plot widget. + """ + self.__xLimits = 1., 100. + self.__yLimits = {'left': (1., 100.), 'right': (1., 100.)} + self.__yAxisInverted = False + self.__keepDataAspectRatio = False + # Store a weakref to get access to the plot state. + self._setPlot(plot) + + @property + def _plot(self): + """The plot this backend is attached to.""" + if self._plotRef is None: + raise RuntimeError('This backend is not attached to a Plot') + + plot = self._plotRef() + if plot is None: + raise RuntimeError('This backend is no more attached to a Plot') + return plot + + def _setPlot(self, plot): + """Allow to set plot after init. + + Use with caution, basically **immediately** after init. + """ + self._plotRef = weakref.ref(plot) + + # Add methods + + def addCurve(self, x, y, legend, + color, symbol, linewidth, linestyle, + yaxis, + xerror, yerror, z, selectable, + fill, alpha, symbolsize): + """Add a 1D curve given by x an y to the graph. + + :param numpy.ndarray x: The data corresponding to the x axis + :param numpy.ndarray y: The data corresponding to the y axis + :param str legend: The legend to be associated to the curve + :param color: color(s) to be used + :type color: string ("#RRGGBB") or (npoints, 4) unsigned byte array or + one of the predefined color names defined in Colors.py + :param str symbol: Symbol to be drawn at each (x, y) position:: + + - ' ' or '' no symbol + - 'o' circle + - '.' point + - ',' pixel + - '+' cross + - 'x' x-cross + - 'd' diamond + - 's' square + + :param float linewidth: The width of the curve in pixels + :param str linestyle: Type of line:: + + - ' ' or '' no line + - '-' solid line + - '--' dashed line + - '-.' dash-dot line + - ':' dotted line + + :param str yaxis: The Y axis this curve belongs to in: 'left', 'right' + :param xerror: Values with the uncertainties on the x values + :type xerror: numpy.ndarray or None + :param yerror: Values with the uncertainties on the y values + :type yerror: numpy.ndarray or None + :param int z: Layer on which to draw the cuve + :param bool selectable: indicate if the curve can be selected + :param bool fill: True to fill the curve, False otherwise + :param float alpha: Curve opacity, as a float in [0., 1.] + :param float symbolsize: Size of the symbol (if any) drawn + at each (x, y) position. + :returns: The handle used by the backend to univocally access the curve + """ + return legend + + def addImage(self, data, legend, + origin, scale, z, + selectable, draggable, + colormap, alpha): + """Add an image to the plot. + + :param numpy.ndarray data: (nrows, ncolumns) data or + (nrows, ncolumns, RGBA) ubyte array + :param str legend: The legend to be associated to the image + :param origin: (origin X, origin Y) of the data. + Default: (0., 0.) + :type origin: 2-tuple of float + :param scale: (scale X, scale Y) of the data. + Default: (1., 1.) + :type scale: 2-tuple of float + :param int z: Layer on which to draw the image + :param bool selectable: indicate if the image can be selected + :param bool draggable: indicate if the image can be moved + :param colormap: Dictionary describing the colormap to use. + Ignored if data is RGB(A). + :type colormap: dict or None + :param float alpha: Opacity of the image, as a float in range [0, 1]. + :returns: The handle used by the backend to univocally access the image + """ + return legend + + def addItem(self, x, y, legend, shape, color, fill, overlay, z): + """Add an item (i.e. a shape) to the plot. + + :param numpy.ndarray x: The X coords of the points of the shape + :param numpy.ndarray y: The Y coords of the points of the shape + :param str legend: The legend to be associated to the item + :param str shape: Type of item to be drawn in + hline, polygon, rectangle, vline, polylines + :param str color: Color of the item + :param bool fill: True to fill the shape + :param bool overlay: True if item is an overlay, False otherwise + :param int z: Layer on which to draw the item + :returns: The handle used by the backend to univocally access the item + """ + return legend + + def addMarker(self, x, y, legend, text, color, + selectable, draggable, + symbol, constraint, overlay): + """Add a point, vertical line or horizontal line marker to the plot. + + :param float x: Horizontal position of the marker in graph coordinates. + If None, the marker is a horizontal line. + :param float y: Vertical position of the marker in graph coordinates. + If None, the marker is a vertical line. + :param str legend: Legend associated to the marker + :param str text: Text associated to the marker (or None for no text) + :param str color: Color to be used for instance 'blue', 'b', '#FF0000' + :param bool selectable: indicate if the marker can be selected + :param bool draggable: indicate if the marker can be moved + :param str symbol: Symbol representing the marker. + Only relevant for point markers where X and Y are not None. + Value in: + + - 'o' circle + - '.' point + - ',' pixel + - '+' cross + - 'x' x-cross + - 'd' diamond + - 's' square + + :param constraint: A function filtering marker displacement by + dragging operations or None for no filter. + This function is called each time a marker is + moved. + This parameter is only used if draggable is 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. + :param bool overlay: True if marker is an overlay (Default: False). + This allows for rendering optimization if this + marker is changed often. + :return: Handle used by the backend to univocally access the marker + """ + return legend + + # Remove methods + + def remove(self, item): + """Remove an existing item from the plot. + + :param item: A backend specific item handle returned by a add* method + """ + pass + + # Interaction methods + + def setGraphCursorShape(self, cursor): + """Set the cursor shape. + + To override in interactive backends. + + :param str cursor: Name of the cursor shape or None + """ + pass + + def setGraphCursor(self, flag, color, linewidth, linestyle): + """Toggle the display of a crosshair cursor and set its attributes. + + To override in interactive backends. + + :param bool flag: Toggle the display of a crosshair cursor. + :param color: The color to use for the crosshair. + :type color: A string (either a predefined color name in Colors.py + or "#RRGGBB")) or a 4 columns unsigned byte array. + :param int linewidth: The width of the lines of the crosshair. + :param linestyle: Type of line:: + + - ' ' no line + - '-' solid line + - '--' dashed line + - '-.' dash-dot line + - ':' dotted line + + :type linestyle: None or one of the predefined styles. + """ + pass + + def pickItems(self, x, y): + """Get a list of items at a pixel position. + + :param float x: The x pixel coord where to pick. + :param float y: The y pixel coord where to pick. + :return: All picked items from back to front. + One dict per item, + with 'kind' key in 'curve', 'marker', 'image'; + 'legend' key, the item legend. + and for curves, 'xdata' and 'ydata' keys storing picked + position on the curve. + :rtype: list of dict + """ + return [] + + # Update curve + + def setCurveColor(self, curve, color): + """Set the color of a curve. + + :param curve: The curve handle + :param str color: The color to use. + """ + pass + + # Misc. + + def getWidgetHandle(self): + """Return the widget this backend is drawing to.""" + return None + + def postRedisplay(self): + """Trigger a :meth:`Plot.replot`. + + Default implementation triggers a synchronous replot if plot is dirty. + This method should be overridden by the embedding widget in order to + provide an asynchronous call to replot in order to optimize the number + replot operations. + """ + # This method can be deferred and it might happen that plot has been + # destroyed in between, especially with unittests + + plot = self._plotRef() + if plot is not None and plot._getDirtyPlot(): + plot.replot() + + def replot(self): + """Redraw the plot.""" + pass + + def saveGraph(self, fileName, fileFormat, dpi): + """Save the graph to a file (or a StringIO) + + :param fileName: Destination + :type fileName: String or StringIO or BytesIO + :param str fileFormat: String specifying the format + :param int dpi: The resolution to use or None. + """ + pass + + # Graph labels + + def setGraphTitle(self, title): + """Set the main title of the plot. + + :param str title: Title associated to the plot + """ + pass + + def setGraphXLabel(self, label): + """Set the X axis label. + + :param str label: label associated to the plot bottom X axis + """ + pass + + def setGraphYLabel(self, label, axis): + """Set the left Y axis label. + + :param str label: label associated to the plot left Y axis + :param str axis: The axis for which to get the limits: left or right + """ + pass + + # Graph limits + + def setLimits(self, xmin, xmax, ymin, ymax, y2min=None, y2max=None): + """Set the limits of the X and Y axes at once. + + :param float xmin: minimum bottom axis value + :param float xmax: maximum bottom axis value + :param float ymin: minimum left axis value + :param float ymax: maximum left axis value + :param float y2min: minimum right axis value + :param float y2max: maximum right axis value + """ + self.__xLimits = xmin, xmax + self.__yLimits['left'] = ymin, ymax + if y2min is not None and y2max is not None: + self.__yLimits['right'] = y2min, y2max + + def getGraphXLimits(self): + """Get the graph X (bottom) limits. + + :return: Minimum and maximum values of the X axis + """ + return self.__xLimits + + def setGraphXLimits(self, xmin, xmax): + """Set the limits of X axis. + + :param float xmin: minimum bottom axis value + :param float xmax: maximum bottom axis value + """ + self.__xLimits = xmin, xmax + + def getGraphYLimits(self, axis): + """Get the graph Y (left) limits. + + :param str axis: The axis for which to get the limits: left or right + :return: Minimum and maximum values of the Y axis + """ + return self.__yLimits[axis] + + def setGraphYLimits(self, ymin, ymax, axis): + """Set the limits of the Y axis. + + :param float ymin: minimum left axis value + :param float ymax: maximum left axis value + :param str axis: The axis for which to get the limits: left or right + """ + self.__yLimits[axis] = ymin, ymax + + # Graph axes + + def setXAxisLogarithmic(self, flag): + """Set the X axis scale between linear and log. + + :param bool flag: If True, the bottom axis will use a log scale + """ + pass + + def setYAxisLogarithmic(self, flag): + """Set the Y axis scale between linear and log. + + :param bool flag: If True, the left axis will use a log scale + """ + pass + + def setYAxisInverted(self, flag): + """Invert the Y axis. + + :param bool flag: If True, put the vertical axis origin on the top + """ + self.__yAxisInverted = bool(flag) + + def isYAxisInverted(self): + """Return True if left Y axis is inverted, False otherwise.""" + return self.__yAxisInverted + + def isKeepDataAspectRatio(self): + """Returns whether the plot is keeping data aspect ratio or not.""" + return self.__keepDataAspectRatio + + def setKeepDataAspectRatio(self, flag): + """Set whether to keep data aspect ratio or not. + + :param flag: True to respect data aspect ratio + :type flag: Boolean, default True + """ + self.__keepDataAspectRatio = bool(flag) + + def setGraphGrid(self, which): + """Set grid. + + :param which: None to disable grid, 'major' for major grid, + 'both' for major and minor grid + """ + pass + + # Data <-> Pixel coordinates conversion + + def dataToPixel(self, x, y, axis): + """Convert a position in data space to a position in pixels + in the widget. + + :param float x: The X coordinate in data space. + :param float y: The Y coordinate in data space. + :param str axis: The Y axis to use for the conversion + ('left' or 'right'). + :returns: The corresponding position in pixels or + None if the data position is not in the displayed area. + :rtype: A tuple of 2 floats: (xPixel, yPixel) or None. + """ + raise NotImplementedError() + + def pixelToData(self, x, y, axis, check): + """Convert a position in pixels in the widget to a position in + the data space. + + :param float x: The X coordinate in pixels. + :param float y: The Y coordinate in pixels. + :param str axis: The Y axis to use for the conversion + ('left' or 'right'). + :param bool check: True to check if the coordinates are in the + plot area. + :returns: The corresponding position in data space or + None if the pixel position is not in the plot area. + :rtype: A tuple of 2 floats: (xData, yData) or None. + """ + raise NotImplementedError() + + def getPlotBoundsInPixels(self): + """Plot area bounds in widget coordinates in pixels. + + :return: bounds as a 4-tuple of int: (left, top, width, height) + """ + raise NotImplementedError() |