在wxPython面板中，我想使用matplotlib's Lasso小部件。在我的实现中，Lasso用于三种不同的功能。然而，为了实现这些功能，我必须将键事件与鼠标按钮事件组合在一起。
默认情况下，按下鼠标左键可以使用初始Lasso功能。所以，对于我的第一个功能，我按下鼠标左键，选择一个感兴趣的区域，并对所包含的点做一些事情。对于第二个功能，我想选择另一个感兴趣的区域并使用这些点做其他事情。我正在尝试按shift + LMB。最后，在我的第三个功能中，我想通过按Ctrl + LMB对所选点进行其他操作。
示意图，我想做以下事情：
if left mouse button is pressed:
use Lasso and with the included points do the 1st functionality
if shift is press and left mouse button is pressed:
use Lasso and with the included points do the 2nd functionality
if ctrl is press and lmb is also pressed :
call Lasso and with the included points do the 3rd functionality
不幸的是，我无法实现目标，并收到以下错误：if self.shift_is_held == True:
AttributeError: object has no attribute 'shift_is_held'。它似乎无法识别按钮事件，而在其他情况下，widgetlock命令似乎不会使轴可用。
以下是我的代码的一部分：
def scatter(self,data):
#create scatter plot
fig = self._view_frame.figure
fig.clf()
Data = []
self.lmans = []
self.points_colors = []
Data2 = []
self.lmans_2 = []
Data3 = []
self.lmans_2 = []
ax = fig.add_subplot('111')
datum = []
datum_2 = []
datum_3 = []
for x,y in zip(self.data[:,0],self.data[:,1]):
datum.append(Datum(x,y))
datum_2.append(Datum2(x,y))
datum_3.append(Datum3(x,y))
ax.scatter(self.data[:, 0], self.data[:, 1], s=150, marker='d')
ax.set_xlim((min(self.data[:,0]), max(self.data[:,0])))
ax.set_ylim((min(self.data[:,1]), max(self.data[:,1])))
ax.set_aspect('auto')
Data.append(datum)
Data2.append(datum_2)
Data3.append(datum_3)
lman = self.LassoManager(ax, datum, Data)
lman_2 = self.LassoManager2(ax, datum_2, Data2)
lman_3 = self.LassoManager3(ax, datum_3, Data3)
fig.canvas.draw()
self.lmans.append(lman)
self.lmans_2.append(lman_2)
self.lmans_3.append(lman_3)
fig.canvas.mpl_connect('axes_enter_event', self.enter_axes)
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()
def enter_axes(self, event):
self.idfig = event.inaxes.colNum
self._view_frame.figure.canvas.mpl_connect('button_press_event', self.onpress_2)
self._view_frame.figure.canvas.mpl_connect('key_press_event', self.onkey_press_2)
self._view_frame.figure.canvas.mpl_connect('key_release_event', self.onkey_release_2)
self._view_frame.figure.canvas.mpl_connect('button_press_event', self.onpress_3)
self._view_frame.figure.canvas.mpl_connect('key_press_event', self.onkey_press_3)
self._view_frame.figure.canvas.mpl_connect('key_release_event', self.onkey_release_3)
def LassoManager(self, ax, data, Data):
self.axes = ax
self.canvas = ax.figure.canvas
self.data = data
self.Data = Data
self.Nxy = len(data)
# self.facecolors = [d.color for d in data]
self.xys = [(d.x, d.y) for d in data]
fig = ax.figure
#self.cid = self.canvas.mpl_connect('button_press_event', self.onpress)
def callback(self, verts):
#facecolors = self.facecolors#collection.get_facecolors()
#colorin = colorConverter.to_rgba('red')
#colorout = colorConverter.to_rgba('blue')
p = path.Path(verts)
self.ind = p.contains_points([(d.x, d.y) for d in self.Data[self.where.colNum]])
self._view_frame.figure.canvas.mpl_connect('button_press_event', self.onpress)
#Functionality 1
self.canvas.draw_idle()
self.canvas.widgetlock.release(self.lasso)
del self.lasso
def onpress(self,event):
if self.canvas.widgetlock.locked(): return
if event.inaxes is None: return
self.lasso = Lasso(event.inaxes, (event.xdata, event.ydata), self.callback)
self.where = event.inaxes
# acquire a lock on the widget drawing
self.canvas.widgetlock(self.lasso)
def onkey_press_2(self,event):
if event.key =='shift':
self.merge_is_held = True
def onkey_press_3(self,event):
if event.key == 'control':
self.split_is_held = True
def onkey_release_2(self, event):
if event.key == 'shift':
self.merge_is_held = False
def onkey_release_3(self, event):
if event.key == 'control':
self.split_is_held = False
def LassoManagerMerge(self, ax, data2, Data2):
self.axes = ax
self.canvas = ax.figure.canvas
self.data2 = data2
self.Data2 = Data2
self.Nxy = len(dataMerge)
self.facecolors_2 = [d.color for d in data2]
# print "facecolors",self.facecolors
self.xys = [(d.x, d.y) for d in data2]
# print "xys",self.xys
fig = ax.figure
self.collection_2 = RegularPolyCollection(
fig.dpi, 6, sizes=(0,),
facecolors=self.facecolors_2,
offsets = self.xys,
transOffset = ax.transData)
ax.add_collection(self.collection_2)
def callback_2(self, verts):
self.facecolors_2 = self.collection_2.get_facecolors()
#colorin = colorConverter.to_rgba('red')
#colorout = colorConverter.to_rgba('blue')
p = path.Path(verts)
self.ind = p.contains_points([(d.x, d.y) for d in self.Data2[self.where.colNum]])
#Functionality 2
self.canvas.draw_idle()
self.canvas.widgetlock.release(self.lasso_2)
del self.lasso_2
def onpress_2(self, event):
if self.canvas.widgetlock.locked(): return
if event.inaxes is None: return
if event.button == 1:
if self.shift_is_held == True:
print "Shift pressed"
self.lasso_2 = Lasso(event.inaxes, (event.xdata, event.ydata), self.callback_2)
print "Shift pressed"
self.where = event.inaxes
self.canvas.widgetlock(self.lasso_2)
def LassoManager3(self, ax, data3, Data3):
self.axes = ax
self.canvas = ax.figure.canvas
self.data3 = data3
self.Data3 = Data3
self.Nxy = len(data3)
self.facecolors_3= [d.color for d in data3]
# print "facecolors",self.facecolors
self.xys = [(d.x, d.y) for d in data3]
# print "xys",self.xys
fig = ax.figure
self.collection_3 = RegularPolyCollection(
fig.dpi, 6, sizes=(0,),
facecolors=self.facecolors_3,
offsets = self.xys,
transOffset = ax.transData)
ax.add_collection(self.collection_3)
def callback_3(self, verts):
self.facecolors_3 = self.collection_3.get_facecolors()
#colorin = colorConverter.to_rgba('red')
#colorout = colorConverter.to_rgba('blue')
p = path.Path(verts)
self.ind = p.contains_points([(d.x, d.y) for d in self.Data3[self.where.colNum]])
#Functionality 3
self.canvas.draw_idle()
self.canvas.widgetlock.release(self.lasso_3)
del self.lasso_3
def onpress_3(self, event):
if self.canvas.widgetlock.locked(): return
if event.inaxes is None: return
if event.button == 1:
if self.split_is_held == True:
print " Split pressed"
self.lasso_3 = Lasso(event.inaxes, (event.xdata, event.ydata), self.callback_3)
print "Split pressed"
self.where = event.inaxes
# acquire a lock on the widget drawing
self.canvas.widgetlock(self.lasso_3)
有什么建议吗？
答案 0 :(得分：2)
我不完全确定你做错了什么，因为你的代码看起来不完整。我认为你的一般想法是正确的，但你似乎混淆了类并试图从错误的类或其他东西访问属性shift_is_held。
我使用matplotlib示例中的lasso_example.py代码编写了这个简单的示例。尝试使用 control 键时遇到了一些并发症。当我尝试使用控制键拖动鼠标时，Lasso管理器变得无响应（包括来自matplotlib的原始代码）。我无法弄清楚为什么，所以我使用 shift 和 alt 键作为当前代码中的修饰符。
您将看到在LassoManager.callback()
import logging
import matplotlib
from matplotlib.widgets import Lasso
from matplotlib.colors import colorConverter
from matplotlib.collections import RegularPolyCollection
from matplotlib import path
import matplotlib.pyplot as plt
from numpy.random import rand
logger = logging.getLogger()
logger.setLevel(logging.DEBUG)
class Datum(object):
colorin = colorConverter.to_rgba('red')
colorShift = colorConverter.to_rgba('cyan')
colorCtrl = colorConverter.to_rgba('pink')
colorout = colorConverter.to_rgba('blue')
def __init__(self, x, y, include=False):
self.x = x
self.y = y
if include:
self.color = self.colorin
else:
self.color = self.colorout
class LassoManager(object):
def __init__(self, ax, data):
self.axes = ax
self.canvas = ax.figure.canvas
self.data = data
self.Nxy = len(data)
facecolors = [d.color for d in data]
self.xys = [(d.x, d.y) for d in data]
fig = ax.figure
self.collection = RegularPolyCollection(
fig.dpi, 6, sizes=(100,),
facecolors=facecolors,
offsets = self.xys,
transOffset = ax.transData)
ax.add_collection(self.collection)
self.cid = self.canvas.mpl_connect('button_press_event', self.onpress)
self.keyPress = self.canvas.mpl_connect('key_press_event', self.onKeyPress)
self.keyRelease = self.canvas.mpl_connect('key_release_event', self.onKeyRelease)
self.lasso = None
self.shiftKey = False
self.ctrlKey = False
def callback(self, verts):
logging.debug('in LassoManager.callback(). Shift: %s, Ctrl: %s' % (self.shiftKey, self.ctrlKey))
facecolors = self.collection.get_facecolors()
p = path.Path(verts)
ind = p.contains_points(self.xys)
for i in range(len(self.xys)):
if ind[i]:
if self.shiftKey:
facecolors[i] = Datum.colorShift
elif self.ctrlKey:
facecolors[i] = Datum.colorCtrl
else:
facecolors[i] = Datum.colorin
else:
facecolors[i] = Datum.colorout
self.canvas.draw_idle()
self.canvas.widgetlock.release(self.lasso)
del self.lasso
def onpress(self, event):
if self.canvas.widgetlock.locked():
return
if event.inaxes is None:
return
self.lasso = Lasso(event.inaxes, (event.xdata, event.ydata), self.callback)
# acquire a lock on the widget drawing
self.canvas.widgetlock(self.lasso)
def onKeyPress(self, event):
logging.debug('in LassoManager.onKeyPress(). Event received: %s (key: %s)' % (event, event.key))
if event.key == 'alt+alt':
self.ctrlKey = True
if event.key == 'shift':
self.shiftKey = True
def onKeyRelease(self, event):
logging.debug('in LassoManager.onKeyRelease(). Event received: %s (key: %s)' % (event, event.key))
if event.key == 'alt':
self.ctrlKey = False
if event.key == 'shift':
self.shiftKey = False
if __name__ == '__main__':
data = [Datum(*xy) for xy in rand(100, 2)]
ax = plt.axes(xlim=(0,1), ylim=(0,1), autoscale_on=False)
lman = LassoManager(ax, data)
plt.show()