按键图像切片上的pyQt5 matplotlib

Question

Matplotlib 嵌入 PyQt5 时不响应按键。我已经验证按键可以与 Tkinter 一起使用。这是我第一次体验 PyQt5。我不确定我在这里做错了什么。我试图通过这样做将重点放在 canvas 上。所有这些都是为了显示 3D 体积数据，您可以将其视为一堆图像。它们一起描述了一个 3D 结构。例如，磁共振成像 (MRI)

self.canvas.setFocusPolicy( QtCore.Qt.ClickFocus )
self.canvas.setFocus()

然而 returns 一个错误：

self.canvas.setFocusPolicy(QtCore.Qt.ClickFocus)
AttributeError: 'InputCanvas' object has no attribute 'canvas'

这是我的代码：

import sys
from PyQt5 import QtCore
from skimage import io
from PyQt5.QtWidgets import QMainWindow, QSizePolicy
from matplotlib.figure import Figure
import matplotlib.pyplot as plt
from PyQt5.QtWidgets import QApplication
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as 
FigureCanvas


class App(QMainWindow):

def __init__(self):
    super().__init__()
    self.left = 10
    self.top = 10
    self.title = 'PYQT'
    self.width = 600
    self.height = 400
    self.initialize_ui()

def initialize_ui(self):
    self.setWindowTitle(self.title)
    self.setGeometry(self.left, self.top, self.width, self.height)
    m = InputCanvas(self, width=3, height=3)
    m.move(200, 20)
    self.show()


class InputCanvas(FigureCanvas):

    def __init__(self, parent=None, width=5, height=4, dpi=100):
        fig = Figure(figsize=(width, height), dpi=dpi)

        FigureCanvas.__init__(self, fig)
        self.setParent(parent)
        FigureCanvas.setSizePolicy(self, QSizePolicy.Expanding, QSizePolicy.Expanding)
        FigureCanvas.updateGeometry(self)
        self.canvas.setFocusPolicy(QtCore.Qt.ClickFocus)
        self.canvas.setFocus()
        fig.canvas.mpl_connect('key_press_event', self.process_key)
        self.input_plot()

    def input_plot(self):
        volume = io.imread("14.mha", plugin='simpleitk')
        ax = self.figure.add_subplot(111)
        ax.volume = volume
        ax.index = volume.shape[0] // 2
        ax.set_title('Ground Truth Image')
        plt.set_cmap("gray")
        plt.axis('off')
        ax.imshow(volume[ax.index])
        self.draw()

    def process_key(self, event):
        fig = event.canvas.figure
        ax = fig.axes[0]
        if event.key == 'j':
            self.previous_slice(ax)
        elif event.key == 'k':
            self.ext_slice(ax)
        self.draw()

    def previous_slice(self, ax):
        volume = ax.volume
        ax.index = (ax.index - 1) % volume.shape[0]  # wrap around using %
        ax.images[0].set_array(volume[ax.index])

    def next_slice(self, ax):
        volume = ax.volume
        ax.index = (ax.index + 1) % volume.shape[0]
        ax.images[0].set_array(volume[ax.index])


if __name__ == '__main__':
   app = QApplication(sys.argv)
   ex = App()
   sys.exit(app.exec_())

Answer 1

您忘记告诉 canvas 它应该在按下某个键时执行某些操作。你可以使用 matplotlib 来做到这一点，

self.cid = self.mpl_connect("key_press_event", self.process_key)

要消除错误，请考虑错误消息。 "canvas" has no attribute canvas 告诉你 canvas 没有自己作为属性。因此

self.setFocusPolicy(QtCore.Qt.ClickFocus)
self.setFocus()

按键图像切片上的pyQt5 matplotlib

pyQt5 matplotlib on key press image slices

python

matplotlib

keyevent

python-3.x