Python 无法在Qt应用程序内重新绘制matplot
我想调用的Python 无法在Qt应用程序内重新绘制matplot,python,qt,matplotlib,pyqt4,pyside,Python,Qt,Matplotlib,Pyqt4,Pyside,我想调用的draw()方法,该方法用于更新已更改但未自动重新绘制的图形。请注意,绘图是在QT应用程序内部生成的。以下是错误跟踪: Traceback (most recent call last): File "/usr/local/lib/python2.7/dist-packages/matplotlib/cbook/__init__.py", line 389, in process proxy(*args, **kwargs) File "/usr/local/lib/p
draw()
方法,该方法用于更新已更改但未自动重新绘制的图形。请注意,绘图是在QT应用程序内部生成的。以下是错误跟踪:
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/matplotlib/cbook/__init__.py", line 389, in process
proxy(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/matplotlib/cbook/__init__.py", line 227, in __call__
return mtd(*args, **kwargs)
File "matplotlib_qt.py", line 43, in mouseClick
self.myMplCanvas.fig.draw()
TypeError: draw_wrapper() takes at least 2 arguments (1 given)
在独立matplotlib应用程序中,可以按如下方式轻松调用draw方法:
import matplotlib.pyplot as plt
fig = plt.figure()
# plot here and change plot variables later
# now re-draw it
plt.draw()
下面是完整的QT应用程序代码:
import sys
from matplotlib.backends import qt_compat
use_pyside = qt_compat.QT_API == qt_compat.QT_API_PYSIDE
if use_pyside:
from PySide import QtGui, QtCore
else:
from PyQt4 import QtGui, QtCore
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
import matplotlib.image as mpimg
class MyMplCanvas(FigureCanvas):
def __init__(self, parent=None, width=5, height=4, dpi=100):
self.fig = Figure(figsize=(width, height), dpi=dpi)
self.axes = self.fig.add_subplot(111)
img = mpimg.imread('stinkbug.png')
lum_img = img[:, :, 0]
self.axes.imshow(lum_img)
FigureCanvas.__init__(self, self.fig)
self.setParent(parent)
FigureCanvas.setSizePolicy(self, QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)
class ApplicationWindow(QtGui.QMainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
self.setWindowTitle("application main window")
self.main_widget = QtGui.QWidget(self)
l = QtGui.QVBoxLayout(self.main_widget)
self.myMplCanvas = MyMplCanvas(self.main_widget, width=5, height=4, dpi=100)
l.addWidget(self.myMplCanvas)
self.main_widget.setFocus()
self.setCentralWidget(self.main_widget)
self.myMplCanvas.mpl_connect('button_press_event', self.mouseClick)
def mouseClick(self, event):
self.myMplCanvas.fig.draw()
qApp = QtGui.QApplication(sys.argv)
aw = ApplicationWindow()
aw.setWindowTitle("hello")
aw.show()
sys.exit(qApp.exec_())
这里怎么了?请注意,如果fig
是一个图形,则plt.draw()
与fig.draw()
不同。要绘制图形,需要提供渲染器
但是,您可能希望绘制画布而不是图形
fig.canvas.draw() # <- not recommended
# better:
fig.canvas.draw_idle()
您是想说draw()不被推荐吗。然而,我甚至不能使用它。你能提供更多的解释吗。非常感谢。您不能使用
fig.draw()
。原因是您需要提供一个渲染器(fig.draw(渲染器)
)。但是,您不希望获得渲染器,而是绘制画布fig.canvas.draw\u idle()
建议优于fig.canvas.draw()
。(有关这方面的解释,请参见第1部分。)
self.myMplCanvas.draw_idle()