""" GUI neutral widgets =================== Widgets that are designed to work for any of the GUI backends. All of these widgets require you to predefine a :class:`matplotlib.axes.Axes` instance and pass that as the first arg. matplotlib doesn't try to be too smart with respect to layout -- you will have to figure out how wide and tall you want your Axes to be to accommodate your widget. """ from __future__ import (absolute_import, division, print_function, unicode_literals) import copy from matplotlib.externals import six from matplotlib.externals.six.moves import zip import numpy as np from .mlab import dist from .patches import Circle, Rectangle, Ellipse from .lines import Line2D from .transforms import blended_transform_factory class LockDraw(object): """ Some widgets, like the cursor, draw onto the canvas, and this is not desirable under all circumstances, like when the toolbar is in zoom-to-rect mode and drawing a rectangle. The module level "lock" allows someone to grab the lock and prevent other widgets from drawing. Use ``matplotlib.widgets.lock(someobj)`` to prevent other widgets from drawing while you're interacting with the canvas. """ def __init__(self): self._owner = None def __call__(self, o): """reserve the lock for *o*""" if not self.available(o): raise ValueError('already locked') self._owner = o def release(self, o): """release the lock""" if not self.available(o): raise ValueError('you do not own this lock') self._owner = None def available(self, o): """drawing is available to *o*""" return not self.locked() or self.isowner(o) def isowner(self, o): """Return True if *o* owns this lock""" return self._owner is o def locked(self): """Return True if the lock is currently held by an owner""" return self._owner is not None class Widget(object): """ Abstract base class for GUI neutral widgets """ drawon = True eventson = True _active = True def set_active(self, active): """Set whether the widget is active. """ self._active = active def get_active(self): """Get whether the widget is active. """ return self._active # set_active is overriden by SelectorWidgets. active = property(get_active, lambda self, active: self.set_active(active), doc="Is the widget active?") def ignore(self, event): """Return True if event should be ignored. This method (or a version of it) should be called at the beginning of any event callback. """ return not self.active class AxesWidget(Widget): """Widget that is connected to a single :class:`~matplotlib.axes.Axes`. To guarantee that the widget remains responsive and not garbage-collected, a reference to the object should be maintained by the user. This is necessary because the callback registry maintains only weak-refs to the functions, which are member functions of the widget. If there are no references to the widget object it may be garbage collected which will disconnect the callbacks. Attributes: *ax* : :class:`~matplotlib.axes.Axes` The parent axes for the widget *canvas* : :class:`~matplotlib.backend_bases.FigureCanvasBase` subclass The parent figure canvas for the widget. *active* : bool If False, the widget does not respond to events. """ def __init__(self, ax): self.ax = ax self.canvas = ax.figure.canvas self.cids = [] def connect_event(self, event, callback): """Connect callback with an event. This should be used in lieu of `figure.canvas.mpl_connect` since this function stores callback ids for later clean up. """ cid = self.canvas.mpl_connect(event, callback) self.cids.append(cid) def disconnect_events(self): """Disconnect all events created by this widget.""" for c in self.cids: self.canvas.mpl_disconnect(c) class Button(AxesWidget): """ A GUI neutral button. For the button to remain responsive you must keep a reference to it. The following attributes are accessible *ax* The :class:`matplotlib.axes.Axes` the button renders into. *label* A :class:`matplotlib.text.Text` instance. *color* The color of the button when not hovering. *hovercolor* The color of the button when hovering. Call :meth:`on_clicked` to connect to the button """ def __init__(self, ax, label, image=None, color='0.85', hovercolor='0.95'): """ Parameters ---------- ax : matplotlib.axes.Axes The :class:`matplotlib.axes.Axes` instance the button will be placed into. label : str The button text. Accepts string. image : array, mpl image, Pillow Image The image to place in the button, if not *None*. Can be any legal arg to imshow (numpy array, matplotlib Image instance, or Pillow Image). color : color The color of the button when not activated hovercolor : color The color of the button when the mouse is over it """ AxesWidget.__init__(self, ax) if image is not None: ax.imshow(image) self.label = ax.text(0.5, 0.5, label, verticalalignment='center', horizontalalignment='center', transform=ax.transAxes) self.cnt = 0 self.observers = {} self.connect_event('button_press_event', self._click) self.connect_event('button_release_event', self._release) self.connect_event('motion_notify_event', self._motion) ax.set_navigate(False) ax.set_axis_bgcolor(color) ax.set_xticks([]) ax.set_yticks([]) self.color = color self.hovercolor = hovercolor self._lastcolor = color def _click(self, event): if self.ignore(event): return if event.inaxes != self.ax: return if not self.eventson: return if event.canvas.mouse_grabber != self.ax: event.canvas.grab_mouse(self.ax) def _release(self, event): if self.ignore(event): return if event.canvas.mouse_grabber != self.ax: return event.canvas.release_mouse(self.ax) if not self.eventson: return if event.inaxes != self.ax: return for cid, func in six.iteritems(self.observers): func(event) def _motion(self, event): if self.ignore(event): return if event.inaxes == self.ax: c = self.hovercolor else: c = self.color if c != self._lastcolor: self.ax.set_axis_bgcolor(c) self._lastcolor = c if self.drawon: self.ax.figure.canvas.draw() def on_clicked(self, func): """ When the button is clicked, call this *func* with event. A connection id is returned. It can be used to disconnect the button from its callback. """ cid = self.cnt self.observers[cid] = func self.cnt += 1 return cid def disconnect(self, cid): """remove the observer with connection id *cid*""" try: del self.observers[cid] except KeyError: pass class Slider(AxesWidget): """ A slider representing a floating point range. For the slider to remain responsive you must maintain a reference to it. The following attributes are defined *ax* : the slider :class:`matplotlib.axes.Axes` instance *val* : the current slider value *vline* : a :class:`matplotlib.lines.Line2D` instance representing the initial value of the slider *poly* : A :class:`matplotlib.patches.Polygon` instance which is the slider knob *valfmt* : the format string for formatting the slider text *label* : a :class:`matplotlib.text.Text` instance for the slider label *closedmin* : whether the slider is closed on the minimum *closedmax* : whether the slider is closed on the maximum *slidermin* : another slider - if not *None*, this slider must be greater than *slidermin* *slidermax* : another slider - if not *None*, this slider must be less than *slidermax* *dragging* : allow for mouse dragging on slider Call :meth:`on_changed` to connect to the slider event """ def __init__(self, ax, label, valmin, valmax, valinit=0.5, valfmt='%1.2f', closedmin=True, closedmax=True, slidermin=None, slidermax=None, dragging=True, **kwargs): """ Create a slider from *valmin* to *valmax* in axes *ax*. Additional kwargs are passed on to ``self.poly`` which is the :class:`matplotlib.patches.Rectangle` that draws the slider knob. See the :class:`matplotlib.patches.Rectangle` documentation for valid property names (e.g., *facecolor*, *edgecolor*, *alpha*, ...). Parameters ---------- ax : Axes The Axes to put the slider in label : str Slider label valmin : float The minimum value of the slider valmax : float The maximum value of the slider valinit : float The slider initial position label : str The slider label valfmt : str Used to format the slider value, fprint format string closedmin : bool Indicate whether the slider interval is closed on the bottom closedmax : bool Indicate whether the slider interval is closed on the top slidermin : Slider or None Do not allow the current slider to have a value less than `slidermin` slidermax : Slider or None Do not allow the current slider to have a value greater than `slidermax` dragging : bool if the slider can be dragged by the mouse """ AxesWidget.__init__(self, ax) self.valmin = valmin self.valmax = valmax self.val = valinit self.valinit = valinit self.poly = ax.axvspan(valmin, valinit, 0, 1, **kwargs) self.vline = ax.axvline(valinit, 0, 1, color='r', lw=1) self.valfmt = valfmt ax.set_yticks([]) ax.set_xlim((valmin, valmax)) ax.set_xticks([]) ax.set_navigate(False) self.connect_event('button_press_event', self._update) self.connect_event('button_release_event', self._update) if dragging: self.connect_event('motion_notify_event', self._update) self.label = ax.text(-0.02, 0.5, label, transform=ax.transAxes, verticalalignment='center', horizontalalignment='right') self.valtext = ax.text(1.02, 0.5, valfmt % valinit, transform=ax.transAxes, verticalalignment='center', horizontalalignment='left') self.cnt = 0 self.observers = {} self.closedmin = closedmin self.closedmax = closedmax self.slidermin = slidermin self.slidermax = slidermax self.drag_active = False def _update(self, event): """update the slider position""" if self.ignore(event): return if event.button != 1: return if event.name == 'button_press_event' and event.inaxes == self.ax: self.drag_active = True event.canvas.grab_mouse(self.ax) if not self.drag_active: return elif ((event.name == 'button_release_event') or (event.name == 'button_press_event' and event.inaxes != self.ax)): self.drag_active = False event.canvas.release_mouse(self.ax) return val = event.xdata if val <= self.valmin: if not self.closedmin: return val = self.valmin elif val >= self.valmax: if not self.closedmax: return val = self.valmax if self.slidermin is not None and val <= self.slidermin.val: if not self.closedmin: return val = self.slidermin.val if self.slidermax is not None and val >= self.slidermax.val: if not self.closedmax: return val = self.slidermax.val self.set_val(val) def set_val(self, val): xy = self.poly.xy xy[2] = val, 1 xy[3] = val, 0 self.poly.xy = xy self.valtext.set_text(self.valfmt % val) if self.drawon: self.ax.figure.canvas.draw_idle() self.val = val if not self.eventson: return for cid, func in six.iteritems(self.observers): func(val) def on_changed(self, func): """ When the slider value is changed, call *func* with the new slider position A connection id is returned which can be used to disconnect """ cid = self.cnt self.observers[cid] = func self.cnt += 1 return cid def disconnect(self, cid): """remove the observer with connection id *cid*""" try: del self.observers[cid] except KeyError: pass def reset(self): """reset the slider to the initial value if needed""" if (self.val != self.valinit): self.set_val(self.valinit) class CheckButtons(AxesWidget): """ A GUI neutral radio button. For the check buttons to remain responsive you must keep a reference to this object. The following attributes are exposed *ax* The :class:`matplotlib.axes.Axes` instance the buttons are located in *labels* List of :class:`matplotlib.text.Text` instances *lines* List of (line1, line2) tuples for the x's in the check boxes. These lines exist for each box, but have ``set_visible(False)`` when its box is not checked. *rectangles* List of :class:`matplotlib.patches.Rectangle` instances Connect to the CheckButtons with the :meth:`on_clicked` method """ def __init__(self, ax, labels, actives): """ Add check buttons to :class:`matplotlib.axes.Axes` instance *ax* *labels* A len(buttons) list of labels as strings *actives* A len(buttons) list of booleans indicating whether the button is active """ AxesWidget.__init__(self, ax) ax.set_xticks([]) ax.set_yticks([]) ax.set_navigate(False) if len(labels) > 1: dy = 1. / (len(labels) + 1) ys = np.linspace(1 - dy, dy, len(labels)) else: dy = 0.25 ys = [0.5] cnt = 0 axcolor = ax.get_axis_bgcolor() self.labels = [] self.lines = [] self.rectangles = [] lineparams = {'color': 'k', 'linewidth': 1.25, 'transform': ax.transAxes, 'solid_capstyle': 'butt'} for y, label in zip(ys, labels): t = ax.text(0.25, y, label, transform=ax.transAxes, horizontalalignment='left', verticalalignment='center') w, h = dy / 2., dy / 2. x, y = 0.05, y - h / 2. p = Rectangle(xy=(x, y), width=w, height=h, facecolor=axcolor, transform=ax.transAxes) l1 = Line2D([x, x + w], [y + h, y], **lineparams) l2 = Line2D([x, x + w], [y, y + h], **lineparams) l1.set_visible(actives[cnt]) l2.set_visible(actives[cnt]) self.labels.append(t) self.rectangles.append(p) self.lines.append((l1, l2)) ax.add_patch(p) ax.add_line(l1) ax.add_line(l2) cnt += 1 self.connect_event('button_press_event', self._clicked) self.cnt = 0 self.observers = {} def _clicked(self, event): if self.ignore(event): return if event.button != 1: return if event.inaxes != self.ax: return for i, (p, t) in enumerate(zip(self.rectangles, self.labels)): if (t.get_window_extent().contains(event.x, event.y) or p.get_window_extent().contains(event.x, event.y)): self.set_active(i) break else: return def set_active(self, index): """ Directly (de)activate a check button by index. *index* is an index into the original label list that this object was constructed with. Raises ValueError if *index* is invalid. Callbacks will be triggered if :attr:`eventson` is True. """ if 0 > index >= len(self.labels): raise ValueError("Invalid CheckButton index: %d" % index) l1, l2 = self.lines[index] l1.set_visible(not l1.get_visible()) l2.set_visible(not l2.get_visible()) if self.drawon: self.ax.figure.canvas.draw() if not self.eventson: return for cid, func in six.iteritems(self.observers): func(self.labels[index].get_text()) def on_clicked(self, func): """ When the button is clicked, call *func* with button label A connection id is returned which can be used to disconnect """ cid = self.cnt self.observers[cid] = func self.cnt += 1 return cid def disconnect(self, cid): """remove the observer with connection id *cid*""" try: del self.observers[cid] except KeyError: pass class RadioButtons(AxesWidget): """ A GUI neutral radio button. For the buttons to remain responsive you must keep a reference to this object. The following attributes are exposed: *ax* The :class:`matplotlib.axes.Axes` instance the buttons are in *activecolor* The color of the button when clicked *labels* A list of :class:`matplotlib.text.Text` instances *circles* A list of :class:`matplotlib.patches.Circle` instances *value_selected* A string listing the current value selected Connect to the RadioButtons with the :meth:`on_clicked` method """ def __init__(self, ax, labels, active=0, activecolor='blue'): """ Add radio buttons to :class:`matplotlib.axes.Axes` instance *ax* *labels* A len(buttons) list of labels as strings *active* The index into labels for the button that is active *activecolor* The color of the button when clicked """ AxesWidget.__init__(self, ax) self.activecolor = activecolor self.value_selected = None ax.set_xticks([]) ax.set_yticks([]) ax.set_navigate(False) dy = 1. / (len(labels) + 1) ys = np.linspace(1 - dy, dy, len(labels)) cnt = 0 axcolor = ax.get_axis_bgcolor() self.labels = [] self.circles = [] for y, label in zip(ys, labels): t = ax.text(0.25, y, label, transform=ax.transAxes, horizontalalignment='left', verticalalignment='center') if cnt == active: self.value_selected = label facecolor = activecolor else: facecolor = axcolor p = Circle(xy=(0.15, y), radius=0.05, facecolor=facecolor, transform=ax.transAxes) self.labels.append(t) self.circles.append(p) ax.add_patch(p) cnt += 1 self.connect_event('button_press_event', self._clicked) self.cnt = 0 self.observers = {} def _clicked(self, event): if self.ignore(event): return if event.button != 1: return if event.inaxes != self.ax: return xy = self.ax.transAxes.inverted().transform_point((event.x, event.y)) pclicked = np.array([xy[0], xy[1]]) def inside(p): pcirc = np.array([p.center[0], p.center[1]]) return dist(pclicked, pcirc) < p.radius for i, (p, t) in enumerate(zip(self.circles, self.labels)): if t.get_window_extent().contains(event.x, event.y) or inside(p): self.set_active(i) break else: return def set_active(self, index): """ Trigger which radio button to make active. *index* is an index into the original label list that this object was constructed with. Raise ValueError if the index is invalid. Callbacks will be triggered if :attr:`eventson` is True. """ if 0 > index >= len(self.labels): raise ValueError("Invalid RadioButton index: %d" % index) self.value_selected = self.labels[index].get_text() for i, p in enumerate(self.circles): if i == index: color = self.activecolor else: color = self.ax.get_axis_bgcolor() p.set_facecolor(color) if self.drawon: self.ax.figure.canvas.draw() if not self.eventson: return for cid, func in six.iteritems(self.observers): func(self.labels[index].get_text()) def on_clicked(self, func): """ When the button is clicked, call *func* with button label A connection id is returned which can be used to disconnect """ cid = self.cnt self.observers[cid] = func self.cnt += 1 return cid def disconnect(self, cid): """remove the observer with connection id *cid*""" try: del self.observers[cid] except KeyError: pass class SubplotTool(Widget): """ A tool to adjust the subplot params of a :class:`matplotlib.figure.Figure`. """ def __init__(self, targetfig, toolfig): """ *targetfig* The figure instance to adjust. *toolfig* The figure instance to embed the subplot tool into. If *None*, a default figure will be created. If you are using this from the GUI """ # FIXME: The docstring seems to just abruptly end without... self.targetfig = targetfig toolfig.subplots_adjust(left=0.2, right=0.9) class toolbarfmt: def __init__(self, slider): self.slider = slider def __call__(self, x, y): fmt = '%s=%s' % (self.slider.label.get_text(), self.slider.valfmt) return fmt % x self.axleft = toolfig.add_subplot(711) self.axleft.set_title('Click on slider to adjust subplot param') self.axleft.set_navigate(False) self.sliderleft = Slider(self.axleft, 'left', 0, 1, targetfig.subplotpars.left, closedmax=False) self.sliderleft.on_changed(self.funcleft) self.axbottom = toolfig.add_subplot(712) self.axbottom.set_navigate(False) self.sliderbottom = Slider(self.axbottom, 'bottom', 0, 1, targetfig.subplotpars.bottom, closedmax=False) self.sliderbottom.on_changed(self.funcbottom) self.axright = toolfig.add_subplot(713) self.axright.set_navigate(False) self.sliderright = Slider(self.axright, 'right', 0, 1, targetfig.subplotpars.right, closedmin=False) self.sliderright.on_changed(self.funcright) self.axtop = toolfig.add_subplot(714) self.axtop.set_navigate(False) self.slidertop = Slider(self.axtop, 'top', 0, 1, targetfig.subplotpars.top, closedmin=False) self.slidertop.on_changed(self.functop) self.axwspace = toolfig.add_subplot(715) self.axwspace.set_navigate(False) self.sliderwspace = Slider(self.axwspace, 'wspace', 0, 1, targetfig.subplotpars.wspace, closedmax=False) self.sliderwspace.on_changed(self.funcwspace) self.axhspace = toolfig.add_subplot(716) self.axhspace.set_navigate(False) self.sliderhspace = Slider(self.axhspace, 'hspace', 0, 1, targetfig.subplotpars.hspace, closedmax=False) self.sliderhspace.on_changed(self.funchspace) # constraints self.sliderleft.slidermax = self.sliderright self.sliderright.slidermin = self.sliderleft self.sliderbottom.slidermax = self.slidertop self.slidertop.slidermin = self.sliderbottom bax = toolfig.add_axes([0.8, 0.05, 0.15, 0.075]) self.buttonreset = Button(bax, 'Reset') sliders = (self.sliderleft, self.sliderbottom, self.sliderright, self.slidertop, self.sliderwspace, self.sliderhspace,) def func(event): thisdrawon = self.drawon self.drawon = False # store the drawon state of each slider bs = [] for slider in sliders: bs.append(slider.drawon) slider.drawon = False # reset the slider to the initial position for slider in sliders: slider.reset() # reset drawon for slider, b in zip(sliders, bs): slider.drawon = b # draw the canvas self.drawon = thisdrawon if self.drawon: toolfig.canvas.draw() self.targetfig.canvas.draw() # during reset there can be a temporary invalid state # depending on the order of the reset so we turn off # validation for the resetting validate = toolfig.subplotpars.validate toolfig.subplotpars.validate = False self.buttonreset.on_clicked(func) toolfig.subplotpars.validate = validate def funcleft(self, val): self.targetfig.subplots_adjust(left=val) if self.drawon: self.targetfig.canvas.draw() def funcright(self, val): self.targetfig.subplots_adjust(right=val) if self.drawon: self.targetfig.canvas.draw() def funcbottom(self, val): self.targetfig.subplots_adjust(bottom=val) if self.drawon: self.targetfig.canvas.draw() def functop(self, val): self.targetfig.subplots_adjust(top=val) if self.drawon: self.targetfig.canvas.draw() def funcwspace(self, val): self.targetfig.subplots_adjust(wspace=val) if self.drawon: self.targetfig.canvas.draw() def funchspace(self, val): self.targetfig.subplots_adjust(hspace=val) if self.drawon: self.targetfig.canvas.draw() class Cursor(AxesWidget): """ A horizontal and vertical line that spans the axes and moves with the pointer. You can turn off the hline or vline respectively with the following attributes: *horizOn* Controls the visibility of the horizontal line *vertOn* Controls the visibility of the horizontal line and the visibility of the cursor itself with the *visible* attribute. For the cursor to remain responsive you must keep a reference to it. """ def __init__(self, ax, horizOn=True, vertOn=True, useblit=False, **lineprops): """ Add a cursor to *ax*. If ``useblit=True``, use the backend- dependent blitting features for faster updates (GTKAgg only for now). *lineprops* is a dictionary of line properties. .. plot :: mpl_examples/widgets/cursor.py """ # TODO: Is the GTKAgg limitation still true? AxesWidget.__init__(self, ax) self.connect_event('motion_notify_event', self.onmove) self.connect_event('draw_event', self.clear) self.visible = True self.horizOn = horizOn self.vertOn = vertOn self.useblit = useblit and self.canvas.supports_blit if self.useblit: lineprops['animated'] = True self.lineh = ax.axhline(ax.get_ybound()[0], visible=False, **lineprops) self.linev = ax.axvline(ax.get_xbound()[0], visible=False, **lineprops) self.background = None self.needclear = False def clear(self, event): """clear the cursor""" if self.ignore(event): return if self.useblit: self.background = self.canvas.copy_from_bbox(self.ax.bbox) self.linev.set_visible(False) self.lineh.set_visible(False) def onmove(self, event): """on mouse motion draw the cursor if visible""" if self.ignore(event): return if not self.canvas.widgetlock.available(self): return if event.inaxes != self.ax: self.linev.set_visible(False) self.lineh.set_visible(False) if self.needclear: self.canvas.draw() self.needclear = False return self.needclear = True if not self.visible: return self.linev.set_xdata((event.xdata, event.xdata)) self.lineh.set_ydata((event.ydata, event.ydata)) self.linev.set_visible(self.visible and self.vertOn) self.lineh.set_visible(self.visible and self.horizOn) self._update() def _update(self): if self.useblit: if self.background is not None: self.canvas.restore_region(self.background) self.ax.draw_artist(self.linev) self.ax.draw_artist(self.lineh) self.canvas.blit(self.ax.bbox) else: self.canvas.draw_idle() return False class MultiCursor(Widget): """ Provide a vertical (default) and/or horizontal line cursor shared between multiple axes. For the cursor to remain responsive you must keep a reference to it. Example usage:: from matplotlib.widgets import MultiCursor from pylab import figure, show, np t = np.arange(0.0, 2.0, 0.01) s1 = np.sin(2*np.pi*t) s2 = np.sin(4*np.pi*t) fig = figure() ax1 = fig.add_subplot(211) ax1.plot(t, s1) ax2 = fig.add_subplot(212, sharex=ax1) ax2.plot(t, s2) multi = MultiCursor(fig.canvas, (ax1, ax2), color='r', lw=1, horizOn=False, vertOn=True) show() """ def __init__(self, canvas, axes, useblit=True, horizOn=False, vertOn=True, **lineprops): self.canvas = canvas self.axes = axes self.horizOn = horizOn self.vertOn = vertOn xmin, xmax = axes[-1].get_xlim() ymin, ymax = axes[-1].get_ylim() xmid = 0.5 * (xmin + xmax) ymid = 0.5 * (ymin + ymax) self.visible = True self.useblit = useblit and self.canvas.supports_blit self.background = None self.needclear = False if self.useblit: lineprops['animated'] = True if vertOn: self.vlines = [ax.axvline(xmid, visible=False, **lineprops) for ax in axes] else: self.vlines = [] if horizOn: self.hlines = [ax.axhline(ymid, visible=False, **lineprops) for ax in axes] else: self.hlines = [] self.connect() def connect(self): """connect events""" self._cidmotion = self.canvas.mpl_connect('motion_notify_event', self.onmove) self._ciddraw = self.canvas.mpl_connect('draw_event', self.clear) def disconnect(self): """disconnect events""" self.canvas.mpl_disconnect(self._cidmotion) self.canvas.mpl_disconnect(self._ciddraw) def clear(self, event): """clear the cursor""" if self.ignore(event): return if self.useblit: self.background = ( self.canvas.copy_from_bbox(self.canvas.figure.bbox)) for line in self.vlines + self.hlines: line.set_visible(False) def onmove(self, event): if self.ignore(event): return if event.inaxes is None: return if not self.canvas.widgetlock.available(self): return self.needclear = True if not self.visible: return if self.vertOn: for line in self.vlines: line.set_xdata((event.xdata, event.xdata)) line.set_visible(self.visible) if self.horizOn: for line in self.hlines: line.set_ydata((event.ydata, event.ydata)) line.set_visible(self.visible) self._update() def _update(self): if self.useblit: if self.background is not None: self.canvas.restore_region(self.background) if self.vertOn: for ax, line in zip(self.axes, self.vlines): ax.draw_artist(line) if self.horizOn: for ax, line in zip(self.axes, self.hlines): ax.draw_artist(line) self.canvas.blit(self.canvas.figure.bbox) else: self.canvas.draw_idle() class _SelectorWidget(AxesWidget): def __init__(self, ax, onselect, useblit=False, button=None, state_modifier_keys=None): AxesWidget.__init__(self, ax) self.visible = True self.onselect = onselect self.useblit = useblit and self.canvas.supports_blit self.connect_default_events() self.state_modifier_keys = dict(move=' ', clear='escape', square='shift', center='control') self.state_modifier_keys.update(state_modifier_keys or {}) self.background = None self.artists = [] if isinstance(button, int): self.validButtons = [button] else: self.validButtons = button # will save the data (position at mouseclick) self.eventpress = None # will save the data (pos. at mouserelease) self.eventrelease = None self._prev_event = None self.state = set() def set_active(self, active): AxesWidget.set_active(self, active) if active: self.update_background(None) def update_background(self, event): """force an update of the background""" # If you add a call to `ignore` here, you'll want to check edge case: # `release` can call a draw event even when `ignore` is True. if self.useblit: self.background = self.canvas.copy_from_bbox(self.ax.bbox) def connect_default_events(self): """Connect the major canvas events to methods.""" self.connect_event('motion_notify_event', self.onmove) self.connect_event('button_press_event', self.press) self.connect_event('button_release_event', self.release) self.connect_event('draw_event', self.update_background) self.connect_event('key_press_event', self.on_key_press) self.connect_event('key_release_event', self.on_key_release) self.connect_event('scroll_event', self.on_scroll) def ignore(self, event): """return *True* if *event* should be ignored""" if not self.active or not self.ax.get_visible(): return True # If canvas was locked if not self.canvas.widgetlock.available(self): return True if not hasattr(event, 'button'): event.button = None # Only do rectangle selection if event was triggered # with a desired button if self.validButtons is not None: if event.button not in self.validButtons: return True # If no button was pressed yet ignore the event if it was out # of the axes if self.eventpress is None: return event.inaxes != self.ax # If a button was pressed, check if the release-button is the # same. if event.button == self.eventpress.button: return False # If a button was pressed, check if the release-button is the # same. return (event.inaxes != self.ax or event.button != self.eventpress.button) def update(self): """draw using newfangled blit or oldfangled draw depending on useblit """ if not self.ax.get_visible(): return False if self.useblit: if self.background is not None: self.canvas.restore_region(self.background) for artist in self.artists: self.ax.draw_artist(artist) self.canvas.blit(self.ax.bbox) else: self.canvas.draw_idle() return False def _get_data(self, event): """Get the xdata and ydata for event, with limits""" if event.xdata is None: return None, None x0, x1 = self.ax.get_xbound() y0, y1 = self.ax.get_ybound() xdata = max(x0, event.xdata) xdata = min(x1, xdata) ydata = max(y0, event.ydata) ydata = min(y1, ydata) return xdata, ydata def _clean_event(self, event): """Clean up an event Use prev event if there is no xdata Limit the xdata and ydata to the axes limits Set the prev event """ if event.xdata is None: event = self._prev_event else: event = copy.copy(event) event.xdata, event.ydata = self._get_data(event) self._prev_event = event return event def press(self, event): """Button press handler and validator""" if not self.ignore(event): event = self._clean_event(event) self.eventpress = event self._prev_event = event key = event.key or '' key = key.replace('ctrl', 'control') # move state is locked in on a button press if key == self.state_modifier_keys['move']: self.state.add('move') self._press(event) return True return False def _press(self, event): """Button press handler""" pass def release(self, event): """Button release event handler and validator""" if not self.ignore(event) and self.eventpress: event = self._clean_event(event) self.eventrelease = event self._release(event) self.eventpress = None self.eventrelease = None self.state.discard('move') return True return False def _release(self, event): """Button release event handler""" pass def onmove(self, event): """Cursor move event handler and validator""" if not self.ignore(event) and self.eventpress: event = self._clean_event(event) self._onmove(event) return True return False def _onmove(self, event): """Cursor move event handler""" pass def on_scroll(self, event): """Mouse scroll event handler and validator""" if not self.ignore(event): self._on_scroll(event) def _on_scroll(self, event): """Mouse scroll event handler""" pass def on_key_press(self, event): """Key press event handler and validator for all selection widgets""" if self.active: key = event.key or '' key = key.replace('ctrl', 'control') if key == self.state_modifier_keys['clear']: for artist in self.artists: artist.set_visible(False) self.update() return for (state, modifier) in self.state_modifier_keys.items(): if modifier in key: self.state.add(state) self._on_key_press(event) def _on_key_press(self, event): """Key press event handler - use for widget-specific key press actions. """ pass def on_key_release(self, event): """Key release event handler and validator""" if self.active: key = event.key or '' for (state, modifier) in self.state_modifier_keys.items(): if modifier in key: self.state.discard(state) self._on_key_release(event) def _on_key_release(self, event): """Key release event handler""" pass def set_visible(self, visible): """ Set the visibility of our artists """ self.visible = visible for artist in self.artists: artist.set_visible(visible) class SpanSelector(_SelectorWidget): """ Select a min/max range of the x or y axes for a matplotlib Axes. For the selector to remain responsive you must keep a reference to it. Example usage:: ax = subplot(111) ax.plot(x,y) def onselect(vmin, vmax): print vmin, vmax span = SpanSelector(ax, onselect, 'horizontal') *onmove_callback* is an optional callback that is called on mouse move within the span range """ def __init__(self, ax, onselect, direction, minspan=None, useblit=False, rectprops=None, onmove_callback=None, span_stays=False, button=None): """ Create a span selector in *ax*. When a selection is made, clear the span and call *onselect* with:: onselect(vmin, vmax) and clear the span. *direction* must be 'horizontal' or 'vertical' If *minspan* is not *None*, ignore events smaller than *minspan* The span rectangle is drawn with *rectprops*; default:: rectprops = dict(facecolor='red', alpha=0.5) Set the visible attribute to *False* if you want to turn off the functionality of the span selector If *span_stays* is True, the span stays visble after making a valid selection. *button* is a list of integers indicating which mouse buttons should be used for selection. You can also specify a single integer if only a single button is desired. Default is *None*, which does not limit which button can be used. Note, typically: 1 = left mouse button 2 = center mouse button (scroll wheel) 3 = right mouse button """ _SelectorWidget.__init__(self, ax, onselect, useblit=useblit, button=button) if rectprops is None: rectprops = dict(facecolor='red', alpha=0.5) rectprops['animated'] = self.useblit if direction not in ['horizontal', 'vertical']: msg = "direction must be in [ 'horizontal' | 'vertical' ]" raise ValueError(msg) self.direction = direction self.rect = None self.pressv = None self.rectprops = rectprops self.onmove_callback = onmove_callback self.minspan = minspan self.span_stays = span_stays # Needed when dragging out of axes self.prev = (0, 0) # Reset canvas so that `new_axes` connects events. self.canvas = None self.new_axes(ax) def new_axes(self, ax): self.ax = ax if self.canvas is not ax.figure.canvas: if self.canvas is not None: self.disconnect_events() self.canvas = ax.figure.canvas self.connect_default_events() if self.direction == 'horizontal': trans = blended_transform_factory(self.ax.transData, self.ax.transAxes) w, h = 0, 1 else: trans = blended_transform_factory(self.ax.transAxes, self.ax.transData) w, h = 1, 0 self.rect = Rectangle((0, 0), w, h, transform=trans, visible=False, **self.rectprops) if self.span_stays: self.stay_rect = Rectangle((0, 0), w, h, transform=trans, visible=False, **self.rectprops) self.stay_rect.set_animated(False) self.ax.add_patch(self.stay_rect) self.ax.add_patch(self.rect) self.artists = [self.rect] def ignore(self, event): """return *True* if *event* should be ignored""" return _SelectorWidget.ignore(self, event) or not self.visible def _press(self, event): """on button press event""" self.rect.set_visible(self.visible) if self.span_stays: self.stay_rect.set_visible(False) # really force a draw so that the stay rect is not in # the blit background if self.useblit: self.canvas.draw() xdata, ydata = self._get_data(event) if self.direction == 'horizontal': self.pressv = xdata else: self.pressv = ydata return False def _release(self, event): """on button release event""" if self.pressv is None: return self.buttonDown = False self.rect.set_visible(False) if self.span_stays: self.stay_rect.set_x(self.rect.get_x()) self.stay_rect.set_y(self.rect.get_y()) self.stay_rect.set_width(self.rect.get_width()) self.stay_rect.set_height(self.rect.get_height()) self.stay_rect.set_visible(True) self.canvas.draw_idle() vmin = self.pressv xdata, ydata = self._get_data(event) if self.direction == 'horizontal': vmax = xdata or self.prev[0] else: vmax = ydata or self.prev[1] if vmin > vmax: vmin, vmax = vmax, vmin span = vmax - vmin if self.minspan is not None and span < self.minspan: return self.onselect(vmin, vmax) self.pressv = None return False def _onmove(self, event): """on motion notify event""" if self.pressv is None: return x, y = self._get_data(event) if x is None: return self.prev = x, y if self.direction == 'horizontal': v = x else: v = y minv, maxv = v, self.pressv if minv > maxv: minv, maxv = maxv, minv if self.direction == 'horizontal': self.rect.set_x(minv) self.rect.set_width(maxv - minv) else: self.rect.set_y(minv) self.rect.set_height(maxv - minv) if self.onmove_callback is not None: vmin = self.pressv xdata, ydata = self._get_data(event) if self.direction == 'horizontal': vmax = xdata or self.prev[0] else: vmax = ydata or self.prev[1] if vmin > vmax: vmin, vmax = vmax, vmin self.onmove_callback(vmin, vmax) self.update() return False class ToolHandles(object): """Control handles for canvas tools. Parameters ---------- ax : :class:`matplotlib.axes.Axes` Matplotlib axes where tool handles are displayed. x, y : 1D arrays Coordinates of control handles. marker : str Shape of marker used to display handle. See `matplotlib.pyplot.plot`. marker_props : dict Additional marker properties. See :class:`matplotlib.lines.Line2D`. """ def __init__(self, ax, x, y, marker='o', marker_props=None, useblit=True): self.ax = ax props = dict(marker=marker, markersize=7, mfc='w', ls='none', alpha=0.5, visible=False, label='_nolegend_') props.update(marker_props if marker_props is not None else {}) self._markers = Line2D(x, y, animated=useblit, **props) self.ax.add_line(self._markers) self.artist = self._markers @property def x(self): return self._markers.get_xdata() @property def y(self): return self._markers.get_ydata() def set_data(self, pts, y=None): """Set x and y positions of handles""" if y is not None: x = pts pts = np.array([x, y]) self._markers.set_data(pts) def set_visible(self, val): self._markers.set_visible(val) def set_animated(self, val): self._markers.set_animated(val) def closest(self, x, y): """Return index and pixel distance to closest index.""" pts = np.transpose((self.x, self.y)) # Transform data coordinates to pixel coordinates. pts = self.ax.transData.transform(pts) diff = pts - ((x, y)) if diff.ndim == 2: dist = np.sqrt(np.sum(diff ** 2, axis=1)) return np.argmin(dist), np.min(dist) else: return 0, np.sqrt(np.sum(diff ** 2)) class RectangleSelector(_SelectorWidget): """ Select a rectangular region of an axes. For the cursor to remain responsive you must keep a reference to it. Example usage:: from matplotlib.widgets import RectangleSelector from pylab import * def onselect(eclick, erelease): 'eclick and erelease are matplotlib events at press and release' print(' startposition : (%f, %f)' % (eclick.xdata, eclick.ydata)) print(' endposition : (%f, %f)' % (erelease.xdata, erelease.ydata)) print(' used button : ', eclick.button) def toggle_selector(event): print(' Key pressed.') if event.key in ['Q', 'q'] and toggle_selector.RS.active: print(' RectangleSelector deactivated.') toggle_selector.RS.set_active(False) if event.key in ['A', 'a'] and not toggle_selector.RS.active: print(' RectangleSelector activated.') toggle_selector.RS.set_active(True) x = arange(100)/(99.0) y = sin(x) fig = figure ax = subplot(111) ax.plot(x,y) toggle_selector.RS = RectangleSelector(ax, onselect, drawtype='line') connect('key_press_event', toggle_selector) show() """ _shape_klass = Rectangle def __init__(self, ax, onselect, drawtype='box', minspanx=None, minspany=None, useblit=False, lineprops=None, rectprops=None, spancoords='data', button=None, maxdist=10, marker_props=None, interactive=False, state_modifier_keys=None): """ Create a selector in *ax*. When a selection is made, clear the span and call onselect with:: onselect(pos_1, pos_2) and clear the drawn box/line. The ``pos_1`` and ``pos_2`` are arrays of length 2 containing the x- and y-coordinate. If *minspanx* is not *None* then events smaller than *minspanx* in x direction are ignored (it's the same for y). The rectangle is drawn with *rectprops*; default:: rectprops = dict(facecolor='red', edgecolor = 'black', alpha=0.2, fill=True) The line is drawn with *lineprops*; default:: lineprops = dict(color='black', linestyle='-', linewidth = 2, alpha=0.5) Use *drawtype* if you want the mouse to draw a line, a box or nothing between click and actual position by setting ``drawtype = 'line'``, ``drawtype='box'`` or ``drawtype = 'none'``. *spancoords* is one of 'data' or 'pixels'. If 'data', *minspanx* and *minspanx* will be interpreted in the same coordinates as the x and y axis. If 'pixels', they are in pixels. *button* is a list of integers indicating which mouse buttons should be used for rectangle selection. You can also specify a single integer if only a single button is desired. Default is *None*, which does not limit which button can be used. Note, typically: 1 = left mouse button 2 = center mouse button (scroll wheel) 3 = right mouse button *interactive* will draw a set of handles and allow you interact with the widget after it is drawn. *state_modifier_keys* are keyboard modifiers that affect the behavior of the widget. The defaults are: dict(move=' ', clear='escape', square='shift', center='ctrl') Keyboard modifiers, which: 'move': Move the existing shape. 'clear': Clear the current shape. 'square': Makes the shape square. 'center': Make the initial point the center of the shape. 'square' and 'center' can be combined. """ _SelectorWidget.__init__(self, ax, onselect, useblit=useblit, button=button, state_modifier_keys=state_modifier_keys) self.to_draw = None self.visible = True self.interactive = interactive if drawtype == 'none': drawtype = 'line' # draw a line but make it self.visible = False # invisible if drawtype == 'box': if rectprops is None: rectprops = dict(facecolor='red', edgecolor='black', alpha=0.2, fill=True) rectprops['animated'] = self.useblit self.rectprops = rectprops self.to_draw = self._shape_klass((0, 0), 0, 1, visible=False, **self.rectprops) self.ax.add_patch(self.to_draw) if drawtype == 'line': if lineprops is None: lineprops = dict(color='black', linestyle='-', linewidth=2, alpha=0.5) lineprops['animated'] = self.useblit self.lineprops = lineprops self.to_draw = Line2D([0, 0], [0, 0], visible=False, **self.lineprops) self.ax.add_line(self.to_draw) self.minspanx = minspanx self.minspany = minspany if spancoords not in ('data', 'pixels'): msg = "'spancoords' must be one of [ 'data' | 'pixels' ]" raise ValueError(msg) self.spancoords = spancoords self.drawtype = drawtype self.maxdist = maxdist if rectprops is None: props = dict(mec='r') else: props = dict(mec=rectprops.get('edgecolor', 'r')) self._corner_order = ['NW', 'NE', 'SE', 'SW'] xc, yc = self.corners self._corner_handles = ToolHandles(self.ax, xc, yc, marker_props=props, useblit=self.useblit) self._edge_order = ['W', 'N', 'E', 'S'] xe, ye = self.edge_centers self._edge_handles = ToolHandles(self.ax, xe, ye, marker='s', marker_props=props, useblit=self.useblit) xc, yc = self.center self._center_handle = ToolHandles(self.ax, [xc], [yc], marker='s', marker_props=props, useblit=self.useblit) self.active_handle = None self.artists = [self.to_draw, self._center_handle.artist, self._corner_handles.artist, self._edge_handles.artist] if not self.interactive: self.artists = [self.to_draw] self._extents_on_press = None def _press(self, event): """on button press event""" # make the drawed box/line visible get the click-coordinates, # button, ... if self.interactive and self.to_draw.get_visible(): self._set_active_handle(event) else: self.active_handle = None if self.active_handle is None or not self.interactive: # Clear previous rectangle before drawing new rectangle. self.update() self.set_visible(self.visible) def _release(self, event): """on button release event""" if not self.interactive: self.to_draw.set_visible(False) if self.spancoords == 'data': xmin, ymin = self.eventpress.xdata, self.eventpress.ydata xmax, ymax = self.eventrelease.xdata, self.eventrelease.ydata # calculate dimensions of box or line get values in the right # order elif self.spancoords == 'pixels': xmin, ymin = self.eventpress.x, self.eventpress.y xmax, ymax = self.eventrelease.x, self.eventrelease.y else: raise ValueError('spancoords must be "data" or "pixels"') if xmin > xmax: xmin, xmax = xmax, xmin if ymin > ymax: ymin, ymax = ymax, ymin spanx = xmax - xmin spany = ymax - ymin xproblems = self.minspanx is not None and spanx < self.minspanx yproblems = self.minspany is not None and spany < self.minspany if (((self.drawtype == 'box') or (self.drawtype == 'line')) and (xproblems or yproblems)): # check if drawn distance (if it exists) is not too small in # neither x nor y-direction self.extents = [0, 0, 0, 0] return # update the eventpress and eventrelease with the resulting extents x1, x2, y1, y2 = self.extents self.eventpress.xdata = x1 self.eventpress.ydata = y1 xy1 = self.ax.transData.transform_point([x1, y1]) self.eventpress.x, self.eventpress.y = xy1 self.eventrelease.xdata = x2 self.eventrelease.ydata = y2 xy2 = self.ax.transData.transform_point([x2, y2]) self.eventrelease.x, self.eventrelease.y = xy2 self.onselect(self.eventpress, self.eventrelease) # call desired function self.update() return False def _onmove(self, event): """on motion notify event if box/line is wanted""" # resize an existing shape if self.active_handle and not self.active_handle == 'C': x1, x2, y1, y2 = self._extents_on_press if self.active_handle in ['E', 'W'] + self._corner_order: x2 = event.xdata if self.active_handle in ['N', 'S'] + self._corner_order: y2 = event.ydata # move existing shape elif (('move' in self.state or self.active_handle == 'C') and self._extents_on_press is not None): x1, x2, y1, y2 = self._extents_on_press dx = event.xdata - self.eventpress.xdata dy = event.ydata - self.eventpress.ydata x1 += dx x2 += dx y1 += dy y2 += dy # new shape else: center = [self.eventpress.xdata, self.eventpress.ydata] center_pix = [self.eventpress.x, self.eventpress.y] dx = (event.xdata - center[0]) / 2. dy = (event.ydata - center[1]) / 2. # square shape if 'square' in self.state: dx_pix = abs(event.x - center_pix[0]) dy_pix = abs(event.y - center_pix[1]) if not dx_pix: return maxd = max(abs(dx_pix), abs(dy_pix)) if abs(dx_pix) < maxd: dx *= maxd / (abs(dx_pix) + 1e-6) if abs(dy_pix) < maxd: dy *= maxd / (abs(dy_pix) + 1e-6) # from center if 'center' in self.state: dx *= 2 dy *= 2 # from corner else: center[0] += dx center[1] += dy x1, x2, y1, y2 = (center[0] - dx, center[0] + dx, center[1] - dy, center[1] + dy) self.extents = x1, x2, y1, y2 @property def _rect_bbox(self): if self.drawtype == 'box': x0 = self.to_draw.get_x() y0 = self.to_draw.get_y() width = self.to_draw.get_width() height = self.to_draw.get_height() return x0, y0, width, height else: x, y = self.to_draw.get_data() x0, x1 = min(x), max(x) y0, y1 = min(y), max(y) return x0, y0, x1 - x0, y1 - y0 @property def corners(self): """Corners of rectangle from lower left, moving clockwise.""" x0, y0, width, height = self._rect_bbox xc = x0, x0 + width, x0 + width, x0 yc = y0, y0, y0 + height, y0 + height return xc, yc @property def edge_centers(self): """Midpoint of rectangle edges from left, moving clockwise.""" x0, y0, width, height = self._rect_bbox w = width / 2. h = height / 2. xe = x0, x0 + w, x0 + width, x0 + w ye = y0 + h, y0, y0 + h, y0 + height return xe, ye @property def center(self): """Center of rectangle""" x0, y0, width, height = self._rect_bbox return x0 + width / 2., y0 + height / 2. @property def extents(self): """Return (xmin, xmax, ymin, ymax).""" x0, y0, width, height = self._rect_bbox xmin, xmax = sorted([x0, x0 + width]) ymin, ymax = sorted([y0, y0 + height]) return xmin, xmax, ymin, ymax @extents.setter def extents(self, extents): # Update displayed shape self.draw_shape(extents) # Update displayed handles self._corner_handles.set_data(*self.corners) self._edge_handles.set_data(*self.edge_centers) self._center_handle.set_data(*self.center) self.set_visible(self.visible) self.update() def draw_shape(self, extents): x0, x1, y0, y1 = extents xmin, xmax = sorted([x0, x1]) ymin, ymax = sorted([y0, y1]) xlim = sorted(self.ax.get_xlim()) ylim = sorted(self.ax.get_ylim()) xmin = max(xlim[0], xmin) ymin = max(ylim[0], ymin) xmax = min(xmax, xlim[1]) ymax = min(ymax, ylim[1]) if self.drawtype == 'box': self.to_draw.set_x(xmin) self.to_draw.set_y(ymin) self.to_draw.set_width(xmax - xmin) self.to_draw.set_height(ymax - ymin) elif self.drawtype == 'line': self.to_draw.set_data([xmin, xmax], [ymin, ymax]) def _set_active_handle(self, event): """Set active handle based on the location of the mouse event""" # Note: event.xdata/ydata in data coordinates, event.x/y in pixels c_idx, c_dist = self._corner_handles.closest(event.x, event.y) e_idx, e_dist = self._edge_handles.closest(event.x, event.y) m_idx, m_dist = self._center_handle.closest(event.x, event.y) if 'move' in self.state: self.active_handle = 'C' self._extents_on_press = self.extents # Set active handle as closest handle, if mouse click is close enough. elif m_dist < self.maxdist * 2: self.active_handle = 'C' elif c_dist > self.maxdist and e_dist > self.maxdist: self.active_handle = None return elif c_dist < e_dist: self.active_handle = self._corner_order[c_idx] else: self.active_handle = self._edge_order[e_idx] # Save coordinates of rectangle at the start of handle movement. x1, x2, y1, y2 = self.extents # Switch variables so that only x2 and/or y2 are updated on move. if self.active_handle in ['W', 'SW', 'NW']: x1, x2 = x2, event.xdata if self.active_handle in ['N', 'NW', 'NE']: y1, y2 = y2, event.ydata self._extents_on_press = x1, x2, y1, y2 @property def geometry(self): if hasattr(self.to_draw, 'get_verts'): xfm = self.ax.transData.inverted() y, x = xfm.transform(self.to_draw.get_verts()).T return np.array([x, y]) else: return np.array(self.to_draw.get_data()) class EllipseSelector(RectangleSelector): """ Select an elliptical region of an axes. For the cursor to remain responsive you must keep a reference to it. Example usage:: from matplotlib.widgets import EllipseSelector from pylab import * def onselect(eclick, erelease): 'eclick and erelease are matplotlib events at press and release' print(' startposition : (%f, %f)' % (eclick.xdata, eclick.ydata)) print(' endposition : (%f, %f)' % (erelease.xdata, erelease.ydata)) print(' used button : ', eclick.button) def toggle_selector(event): print(' Key pressed.') if event.key in ['Q', 'q'] and toggle_selector.ES.active: print(' EllipseSelector deactivated.') toggle_selector.RS.set_active(False) if event.key in ['A', 'a'] and not toggle_selector.ES.active: print(' EllipseSelector activated.') toggle_selector.ES.set_active(True) x = arange(100)/(99.0) y = sin(x) fig = figure ax = subplot(111) ax.plot(x,y) toggle_selector.ES = EllipseSelector(ax, onselect, drawtype='line') connect('key_press_event', toggle_selector) show() """ _shape_klass = Ellipse def draw_shape(self, extents): x1, x2, y1, y2 = extents xmin, xmax = sorted([x1, x2]) ymin, ymax = sorted([y1, y2]) center = [x1 + (x2 - x1) / 2., y1 + (y2 - y1) / 2.] a = (xmax - xmin) / 2. b = (ymax - ymin) / 2. if self.drawtype == 'box': self.to_draw.center = center self.to_draw.width = 2 * a self.to_draw.height = 2 * b else: rad = np.arange(31) * 12 * np.pi / 180 x = a * np.cos(rad) + center[0] y = b * np.sin(rad) + center[1] self.to_draw.set_data(x, y) @property def _rect_bbox(self): if self.drawtype == 'box': x, y = self.to_draw.center width = self.to_draw.width height = self.to_draw.height return x - width / 2., y - height / 2., width, height else: x, y = self.to_draw.get_data() x0, x1 = min(x), max(x) y0, y1 = min(y), max(y) return x0, y0, x1 - x0, y1 - y0 class LassoSelector(_SelectorWidget): """Selection curve of an arbitrary shape. For the selector to remain responsive you must keep a reference to it. The selected path can be used in conjunction with :func:`~matplotlib.path.Path.contains_point` to select data points from an image. In contrast to :class:`Lasso`, `LassoSelector` is written with an interface similar to :class:`RectangleSelector` and :class:`SpanSelector` and will continue to interact with the axes until disconnected. Parameters: *ax* : :class:`~matplotlib.axes.Axes` The parent axes for the widget. *onselect* : function Whenever the lasso is released, the `onselect` function is called and passed the vertices of the selected path. Example usage:: ax = subplot(111) ax.plot(x,y) def onselect(verts): print verts lasso = LassoSelector(ax, onselect) *button* is a list of integers indicating which mouse buttons should be used for rectangle selection. You can also specify a single integer if only a single button is desired. Default is *None*, which does not limit which button can be used. Note, typically: 1 = left mouse button 2 = center mouse button (scroll wheel) 3 = right mouse button """ def __init__(self, ax, onselect=None, useblit=True, lineprops=None, button=None): _SelectorWidget.__init__(self, ax, onselect, useblit=useblit, button=button) self.verts = None if lineprops is None: lineprops = dict() if useblit: lineprops['animated'] = True self.line = Line2D([], [], **lineprops) self.line.set_visible(False) self.ax.add_line(self.line) self.artists = [self.line] def onpress(self, event): self.press(event) def _press(self, event): self.verts = [self._get_data(event)] self.line.set_visible(True) def onrelease(self, event): self.release(event) def _release(self, event): if self.verts is not None: self.verts.append(self._get_data(event)) self.onselect(self.verts) self.line.set_data([[], []]) self.line.set_visible(False) self.verts = None def _onmove(self, event): if self.verts is None: return self.verts.append(self._get_data(event)) self.line.set_data(list(zip(*self.verts))) self.update() class Lasso(AxesWidget): """Selection curve of an arbitrary shape. The selected path can be used in conjunction with :func:`~matplotlib.path.Path.contains_point` to select data points from an image. Unlike :class:`LassoSelector`, this must be initialized with a starting point `xy`, and the `Lasso` events are destroyed upon release. Parameters: *ax* : :class:`~matplotlib.axes.Axes` The parent axes for the widget. *xy* : array Coordinates of the start of the lasso. *callback* : function Whenever the lasso is released, the `callback` function is called and passed the vertices of the selected path. """ def __init__(self, ax, xy, callback=None, useblit=True): AxesWidget.__init__(self, ax) self.useblit = useblit and self.canvas.supports_blit if self.useblit: self.background = self.canvas.copy_from_bbox(self.ax.bbox) x, y = xy self.verts = [(x, y)] self.line = Line2D([x], [y], linestyle='-', color='black', lw=2) self.ax.add_line(self.line) self.callback = callback self.connect_event('button_release_event', self.onrelease) self.connect_event('motion_notify_event', self.onmove) def onrelease(self, event): if self.ignore(event): return if self.verts is not None: self.verts.append((event.xdata, event.ydata)) if len(self.verts) > 2: self.callback(self.verts) self.ax.lines.remove(self.line) self.verts = None self.disconnect_events() def onmove(self, event): if self.ignore(event): return if self.verts is None: return if event.inaxes != self.ax: return if event.button != 1: return self.verts.append((event.xdata, event.ydata)) self.line.set_data(list(zip(*self.verts))) if self.useblit: self.canvas.restore_region(self.background) self.ax.draw_artist(self.line) self.canvas.blit(self.ax.bbox) else: self.canvas.draw_idle()