For code/output blocks: Use ``` (aka backtick or grave accent) in a single line before and after the block. See: http://commonmark.org/help/
MultiCursor horizontal and vertical lines invisible
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In the matplotlib's multicursor example:
import numpy as np import matplotlib.pyplot as plt from matplotlib.widgets import MultiCursor t = np.arange(0.0, 2.0, 0.01) s1 = np.sin(2*np.pi*t) s2 = np.sin(4*np.pi*t) fig, (ax1, ax2) = plt.subplots(2, sharex=True) ax1.plot(t, s1) ax2.plot(t, s2) multi = MultiCursor(fig.canvas, (ax1, ax2), color='r', lw=1) plt.show()The horizontal and vertical lines is visible. Why in the backtrader situation, the are disappeared?
I checked the MultiCursor source code in backtrader,
class MultiCursor(Widget): """ Provide a vertical (default) and/or horizontal line cursor shared between multiple axes. For the cursor to remain responsive you much 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, horizMulti=False, vertMulti=True, horizShared=True, vertShared=False, **lineprops): self.canvas = canvas self.axes = axes self.horizOn = horizOn self.vertOn = vertOn self.horizMulti = horizMulti self.vertMulti = vertMulti self.visible = True self.useblit = useblit and self.canvas.supports_blit self.background = None self.needclear = False if self.useblit: lineprops['animated'] = True self.vlines = [] if vertOn: xmin, xmax = axes[-1].get_xlim() xmid = 0.5 * (xmin + xmax) for ax in axes: if not horizShared: xmin, xmax = ax.get_xlim() xmid = 0.5 * (xmin + xmax) vline = ax.axvline(xmid, visible=False, **lineprops) self.vlines.append(vline) self.hlines = [] if horizOn: ymin, ymax = axes[-1].get_ylim() ymid = 0.5 * (ymin + ymax) for ax in axes: if not vertShared: ymin, ymax = ax.get_ylim() ymid = 0.5 * (ymin + ymax) hline = ax.axhline(ymid, visible=False, **lineprops) self.hlines.append(hline) 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: visible = self.visible if not self.vertMulti: visible = visible and line.axes == event.inaxes if visible: line.set_xdata((event.xdata, event.xdata)) line.set_visible(visible) if self.horizOn: for line in self.hlines: visible = self.visible if not self.horizMulti: visible = visible and line.axes == event.inaxes if visible: line.set_ydata((event.ydata, event.ydata)) line.set_visible(self.visible) self._update(event) def _update(self, event): 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): if self.vertMulti or event.inaxes == line.axes: ax.draw_artist(line) if self.horizOn: for ax, line in zip(self.axes, self.hlines): if self.horizMulti or event.inaxes == line.axes: ax.draw_artist(line) self.canvas.blit(self.canvas.figure.bbox) else: self.canvas.draw_idle()and compared it to the one in matplotlib:
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 import matplotlib.pyplot as plt import numpy as np fig, (ax1, ax2) = plt.subplots(nrows=2, sharex=True) t = np.arange(0.0, 2.0, 0.01) ax1.plot(t, np.sin(2*np.pi*t)) ax2.plot(t, np.sin(4*np.pi*t)) multi = MultiCursor(fig.canvas, (ax1, ax2), color='r', lw=1, horizOn=False, vertOn=True) plt.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()Nothing is wrong. What's the problem? Any suggestions?
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Problem solved. Simply modify block=True in plot.py:
def show(self): self.mpyplot.show(block=True)
