在 pyqtgraph 中使用 AxisItem 打开网格会导致轴缩放中断

Question

我在使用 AxisItem 时遇到问题。一旦我同时打开 x 和 y 网格，x 轴就不再能够使用 zoom/pan 函数进行缩放。有什么想法吗？

from PyQt4 import QtCore, QtGui 
from pyqtgraph import Point 
import pyqtgraph as pg


pg.setConfigOption('background', 'w')
pg.setConfigOption('foreground', 'k')

class plotClass(QtGui.QMainWindow):  
    def setupUi(self, MainWindow):

        self.centralwidget = QtGui.QWidget(MainWindow)      
        MainWindow.resize(1900, 1000)

        self.viewbox = pg.GraphicsView(MainWindow, useOpenGL=None, background='default')
        self.viewbox.setGeometry(QtCore.QRect(0, 0, 1600, 1000))

        self.layout = pg.GraphicsLayout()
        self.viewbox.setCentralWidget(self.layout)
        self.viewbox.show()

        self.view = self.layout.addViewBox()

        self.axis1 = pg.AxisItem('bottom', linkView=self.view, parent=self.layout)
        self.axis2 = pg.AxisItem('right', linkView=self.view, parent=self.layout)

        self.axis1.setGrid(255)
        self.axis2.setGrid(255)

        self.layout.addItem(self.axis1, row=1, col=0)
        self.layout.addItem(self.axis2, row=0, col=1)

if __name__== "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    MainWindow = QtGui.QMainWindow()
    ui = plotClass()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

Answer 1

查看您最后的评论，考虑这个选项：

pyqtgraph 示例文件夹包含一个 "GraphItem.py" 示例，它仅通过 ViewBox 添加和显示 GraphItem 对象到 window。然而，他们不使用网格，所以如果你想使用带有 GraphItem 的网格，只需先添加一个 PlotItem（它已经有一个关联的 ViewBox ......你猜对了，......网格的 AxisItems！） ,... 然后获取 ViewBox 以添加您的 GraphItems。修改后的 GraphItem.py 看起来像这样（带有随附的 showGrid）：

import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui
import numpy as np

# Enable antialiasing for prettier plots
pg.setConfigOptions(antialias=True)

w = pg.GraphicsWindow()
w.setWindowTitle('pyqtgraph example: GraphItem')

### comment out their add of the viewbox
### since the PlotItem we're adding will have it's 
### own ViewBox

#v = w.addViewBox()


pItem1 = w.addPlot()  # this is our new PlotItem
v = pItem1.getViewBox()  # get the PlotItem's ViewBox
v.setAspectLocked()  # same as before

g = pg.GraphItem() # same as before
v.addItem(g)  # same as before

pItem1.showGrid(x=True,y=True)  # now we can turn on the grid

### remaining code is the same as their example

## Define positions of nodes
pos = np.array([
    [0,0],
    [10,0],
    [0,10],
    [10,10],
    [5,5],
    [15,5]
    ])

## Define the set of connections in the graph
adj = np.array([
    [0,1],
    [1,3],
    [3,2],
    [2,0],
    [1,5],
    [3,5],
    ])

## Define the symbol to use for each node (this is optional)
symbols = ['o','o','o','o','t','+']

## Define the line style for each connection (this is optional)
lines = np.array([
    (255,0,0,255,1),
    (255,0,255,255,2),
    (255,0,255,255,3),
    (255,255,0,255,2),
    (255,0,0,255,1),
    (255,255,255,255,4),
    ], dtype=[('red',np.ubyte),('green',np.ubyte),('blue',np.ubyte),('alpha',np.ubyte),('width',float)])

## Update the graph
g.setData(pos=pos, adj=adj, pen=lines, size=1, symbol=symbols, pxMode=False)


## Start Qt event loop unless running in interactive mode or using pyside.
if __name__ == '__main__':
    import sys
    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
        QtGui.QApplication.instance().exec_()

我对此进行了测试，scroll/zooming 在启用网格后仍然有效，所以仍然不确定为什么用另一种方法不起作用，但有时找到另一种方法是最好的答案:)

在 pyqtgraph 中使用 AxisItem 打开网格会导致轴缩放中断

turning grid on with AxisItem in pyqtgraph causes axis scaling to break

python

pyqt

pyqtgraph