如何使用 pyqtgraph 拥有多个具有相同 alignment/position 的左 axisItems？
How can I have multiple left axisItems with the same alignment/position using pyqtgraph?
不知是否有人可以帮助我。我正在尝试转换 pyqtgraph 中的 MultiplePlotAxes.py 示例，以便所有轴都位于右侧并对齐。这是我的代码，我添加了一个额外的情节：
"""
Demonstrates a way to put multiple axes around a single plot.
(This will eventually become a built-in feature of PlotItem)
"""
#import initExample ## Add path to library (just for examples; you do not need this)
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui
import numpy as np
pg.mkQApp()
pw = pg.PlotWidget()
pw.show()
pw.setWindowTitle('pyqtgraph example: MultiplePlotAxes')
p1 = pw.plotItem
p1.setLabels(left='axis 1')
## create a new ViewBox, link the right axis to its coordinate system
p2 = pg.ViewBox()
p1.showAxis('right')
p1.scene().addItem(p2)
p1.getAxis('right').linkToView(p2)
p2.setXLink(p1)
p1.getAxis('right').setLabel('axis2', color='#0000ff')
## create third ViewBox.
## this time we need to create a new axis as well.
p3 = pg.ViewBox()
ax3 = pg.AxisItem('right')
p1.layout.addItem(ax3, 2, 3)
p1.scene().addItem(p3)
ax3.linkToView(p3)
p3.setXLink(p1)
ax3.setZValue(-10000)
ax3.setLabel('axis 3', color='#ff0000')
## create forth ViewBox.
## this time we need to create a new axis as well.
p4 = pg.ViewBox()
ax4 = pg.AxisItem('right')
p1.layout.addItem(ax4, 2, 4)
p1.scene().addItem(p4)
ax4.linkToView(p4)
p4.setXLink(p1)
ax4.setZValue(-10000)
ax4.setLabel('axis 4', color='#2EFEF7')
## Handle view resizing
def updateViews():
## view has resized; update auxiliary views to match
global p1, p2, p3, p4
p2.setGeometry(p1.vb.sceneBoundingRect())
p3.setGeometry(p1.vb.sceneBoundingRect())
p4.setGeometry(p1.vb.sceneBoundingRect())
## need to re-update linked axes since this was called
## incorrectly while views had different shapes.
## (probably this should be handled in ViewBox.resizeEvent)
p2.linkedViewChanged(p1.vb, p2.XAxis)
p3.linkedViewChanged(p1.vb, p3.XAxis)
p4.linkedViewChanged(p1.vb, p4.XAxis)
updateViews()
p1.vb.sigResized.connect(updateViews)
p1.plot([1, 2, 4, 8, 16, 32])
p2.addItem(pg.PlotCurveItem([1, 2, 4, 9, 16, 32], pen='b'))
p3.addItem(pg.PlotCurveItem([1, 2, 4, 7, 16, 32], pen='r'))
p4.addItem(pg.PlotCurveItem([1, 3, 5, 7, 17, 32], pen='c'))
## 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_()
这会产生下面的图片，我添加了一个红色箭头来显示我想要做什么。
根据我能够弄清楚的内容，我可以使用 pg.GraphicsLayout() 来完成此操作。但是，与 plotItem 直接关联的 axisItem 和创建的 axisItem 不匹配，因为附加到 plotitem 的 axisItem 较小。
这是我认为正在发生的事情的图片：
这是我的问题，因为我希望它们全部对齐。在附加的代码中，您可以将 addItem(axes,2,1) 添加到右侧，但它在左侧不起作用。有人知道我该怎么做吗？
在此先感谢您提供的任何帮助。
我遇到了同样的问题，看到了这个 post，对没有答案感到失望，但我终于设法解决了问题，所以我想我会 post 在这里。
如果你能 post 右侧轴的代码，我可以修补它，但基本上我所做的是将底部轴附加到它自己的一行。
self.main_pI = pg.PlotItem()
self.axis_bottom = self.main_pI.getAxis('bottom')
self.axis_bottom.setLabel('Time (seconds)', color='#ffffff')
self.layout.addItem(self.main_pI, row=1, col=2, rowspan=2)
self.layout.addItem(self.axis_bottom, row=3, col=2, rowspan=2)
我是 pyqtgraph 的新手，所以我确定我会废除这个术语，但我分离了 'bottom' 轴，然后将它重新附加到布局中，它位于它自己的。
希望对您有所帮助。
我想出了一些不完美但非常接近的东西。使用上面的建议并在适当的 space 底部添加一个额外的轴项目并将其消隐我想出了这个。所有线都与 y 轴对齐但并不完全对齐，但足够接近以避开它。这就是区别
原创
新的
代码如下：
from pyqtgraph.Qt import QtGui, QtCore
import pyqtgraph as pg
pg.mkQApp()
# Axis
a2 = pg.AxisItem("left")
a3 = pg.AxisItem("left")
a4 = pg.AxisItem("left")
a5 = pg.AxisItem("left")
a6 = pg.AxisItem("left")
# ViewBoxes
v2 = pg.ViewBox()
v3 = pg.ViewBox()
v4 = pg.ViewBox()
v5 = pg.ViewBox()
v6 = pg.ViewBox()
# main view
pw = pg.GraphicsView()
pw.setWindowTitle('pyqtgraph example: multiple y-axis')
pw.show()
# layout
l = pg.GraphicsLayout()
pw.setCentralWidget(l)
# add axis to layout
## watch the col parameter here for the position
l.addItem(a2, row=1, col=5, rowspan=1, colspan=1)
l.addItem(a3, row=1, col=4, rowspan=1, colspan=1)
l.addItem(a4, row=1, col=3, rowspan=1, colspan=1)
l.addItem(a5, row=1, col=2, rowspan=1, colspan=1)
l.addItem(a6, row=1, col=1, rowspan=1, colspan=1)
# Blank axis used for aligning things
ax = pg.AxisItem(orientation='bottom')
ax.setPen('#000000')
pos = (2,2)
l.addItem(ax, *pos)
# plotitem and viewbox
## at least one plotitem is used whioch holds its own viewbox and left axis
pI = pg.PlotItem()
v1 = pI.vb # reference to viewbox of the plotitem
l.addItem(pI, row=1, col=8, rowspan=2, colspan=1) # add plotitem to layout
# split off 1st axis and put to side
pI.axis_left = pI.getAxis('left')
pos = (1,7)
l.addItem(pI.axis_left, *pos)
# add viewboxes to layout
l.scene().addItem(v2)
l.scene().addItem(v3)
l.scene().addItem(v4)
l.scene().addItem(v5)
l.scene().addItem(v6)
# link axis with viewboxes
a2.linkToView(v2)
a3.linkToView(v3)
a4.linkToView(v4)
a5.linkToView(v5)
a6.linkToView(v6)
# link viewboxes
v2.setXLink(v1)
v3.setXLink(v2)
v4.setXLink(v3)
v5.setXLink(v4)
v6.setXLink(v5)
# axes labels
pI.getAxis("left").setLabel('axis 1 in ViewBox of PlotItem', color='#FFFFFF')
a2.setLabel('axis 2 in Viewbox 2', color='#2E2EFE')
a3.setLabel('axis 3 in Viewbox 3', color='#2EFEF7')
a4.setLabel('axis 4 in Viewbox 4', color='#2EFE2E')
a5.setLabel('axis 5 in Viewbox 5', color='#FFFF00')
a6.setLabel('axis 6 in Viewbox 6', color='#FE2E64')
# slot: update view when resized
def updateViews():
v2.setGeometry(v1.sceneBoundingRect())
v3.setGeometry(v1.sceneBoundingRect())
v4.setGeometry(v1.sceneBoundingRect())
v5.setGeometry(v1.sceneBoundingRect())
v6.setGeometry(v1.sceneBoundingRect())
# data
x = [1, 2, 3, 4, 5, 6]
y1 = [0, 4, 6, 8, 10, 4]
y2 = [0, 5, 7, 9, 11, 3]
y3 = [0, 1, 2, 3, 4, 12]
y4 = [0, 8, 0.3, 0.4, 2, 5]
y5 = [0, 1, 6, 4, 2, 1]
y6 = [0, 0.2, 0.3, 0.4, 0.5, 0.6]
# plot
v1.addItem(pg.PlotCurveItem(x, y1, pen='#FFFFFF'))
v2.addItem(pg.PlotCurveItem(x, y2, pen='#2E2EFE'))
v3.addItem(pg.PlotCurveItem(x, y3, pen='#2EFEF7'))
v4.addItem(pg.PlotCurveItem(x, y4, pen='#2EFE2E'))
v5.addItem(pg.PlotCurveItem(x, y5, pen='#FFFF00'))
v6.addItem(pg.PlotCurveItem(x, y6, pen='#FE2E64'))
# updates when resized
v1.sigResized.connect(updateViews)
# autorange once to fit views at start
v2.enableAutoRange(axis=pg.ViewBox.XYAxes, enable=True)
v3.enableAutoRange(axis=pg.ViewBox.XYAxes, enable=True)
v4.enableAutoRange(axis=pg.ViewBox.XYAxes, enable=True)
v5.enableAutoRange(axis=pg.ViewBox.XYAxes, enable=True)
v6.enableAutoRange(axis=pg.ViewBox.XYAxes, enable=True)
updateViews()
if __name__ == '__main__':
import sys
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
QtGui.QApplication.instance().exec_()
希望对以后遇到同样问题的人有所帮助
不知是否有人可以帮助我。我正在尝试转换 pyqtgraph 中的 MultiplePlotAxes.py 示例，以便所有轴都位于右侧并对齐。这是我的代码，我添加了一个额外的情节：
"""
Demonstrates a way to put multiple axes around a single plot.
(This will eventually become a built-in feature of PlotItem)
"""
#import initExample ## Add path to library (just for examples; you do not need this)
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui
import numpy as np
pg.mkQApp()
pw = pg.PlotWidget()
pw.show()
pw.setWindowTitle('pyqtgraph example: MultiplePlotAxes')
p1 = pw.plotItem
p1.setLabels(left='axis 1')
## create a new ViewBox, link the right axis to its coordinate system
p2 = pg.ViewBox()
p1.showAxis('right')
p1.scene().addItem(p2)
p1.getAxis('right').linkToView(p2)
p2.setXLink(p1)
p1.getAxis('right').setLabel('axis2', color='#0000ff')
## create third ViewBox.
## this time we need to create a new axis as well.
p3 = pg.ViewBox()
ax3 = pg.AxisItem('right')
p1.layout.addItem(ax3, 2, 3)
p1.scene().addItem(p3)
ax3.linkToView(p3)
p3.setXLink(p1)
ax3.setZValue(-10000)
ax3.setLabel('axis 3', color='#ff0000')
## create forth ViewBox.
## this time we need to create a new axis as well.
p4 = pg.ViewBox()
ax4 = pg.AxisItem('right')
p1.layout.addItem(ax4, 2, 4)
p1.scene().addItem(p4)
ax4.linkToView(p4)
p4.setXLink(p1)
ax4.setZValue(-10000)
ax4.setLabel('axis 4', color='#2EFEF7')
## Handle view resizing
def updateViews():
## view has resized; update auxiliary views to match
global p1, p2, p3, p4
p2.setGeometry(p1.vb.sceneBoundingRect())
p3.setGeometry(p1.vb.sceneBoundingRect())
p4.setGeometry(p1.vb.sceneBoundingRect())
## need to re-update linked axes since this was called
## incorrectly while views had different shapes.
## (probably this should be handled in ViewBox.resizeEvent)
p2.linkedViewChanged(p1.vb, p2.XAxis)
p3.linkedViewChanged(p1.vb, p3.XAxis)
p4.linkedViewChanged(p1.vb, p4.XAxis)
updateViews()
p1.vb.sigResized.connect(updateViews)
p1.plot([1, 2, 4, 8, 16, 32])
p2.addItem(pg.PlotCurveItem([1, 2, 4, 9, 16, 32], pen='b'))
p3.addItem(pg.PlotCurveItem([1, 2, 4, 7, 16, 32], pen='r'))
p4.addItem(pg.PlotCurveItem([1, 3, 5, 7, 17, 32], pen='c'))
## 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_()
这会产生下面的图片，我添加了一个红色箭头来显示我想要做什么。
根据我能够弄清楚的内容，我可以使用 pg.GraphicsLayout() 来完成此操作。但是，与 plotItem 直接关联的 axisItem 和创建的 axisItem 不匹配，因为附加到 plotitem 的 axisItem 较小。
这是我认为正在发生的事情的图片：
这是我的问题，因为我希望它们全部对齐。在附加的代码中，您可以将 addItem(axes,2,1) 添加到右侧，但它在左侧不起作用。有人知道我该怎么做吗？
在此先感谢您提供的任何帮助。
我遇到了同样的问题，看到了这个 post，对没有答案感到失望，但我终于设法解决了问题，所以我想我会 post 在这里。
如果你能 post 右侧轴的代码，我可以修补它，但基本上我所做的是将底部轴附加到它自己的一行。
self.main_pI = pg.PlotItem()
self.axis_bottom = self.main_pI.getAxis('bottom')
self.axis_bottom.setLabel('Time (seconds)', color='#ffffff')
self.layout.addItem(self.main_pI, row=1, col=2, rowspan=2)
self.layout.addItem(self.axis_bottom, row=3, col=2, rowspan=2)
我是 pyqtgraph 的新手，所以我确定我会废除这个术语，但我分离了 'bottom' 轴，然后将它重新附加到布局中，它位于它自己的。
希望对您有所帮助。
我想出了一些不完美但非常接近的东西。使用上面的建议并在适当的 space 底部添加一个额外的轴项目并将其消隐我想出了这个。所有线都与 y 轴对齐但并不完全对齐，但足够接近以避开它。这就是区别
原创
from pyqtgraph.Qt import QtGui, QtCore
import pyqtgraph as pg
pg.mkQApp()
# Axis
a2 = pg.AxisItem("left")
a3 = pg.AxisItem("left")
a4 = pg.AxisItem("left")
a5 = pg.AxisItem("left")
a6 = pg.AxisItem("left")
# ViewBoxes
v2 = pg.ViewBox()
v3 = pg.ViewBox()
v4 = pg.ViewBox()
v5 = pg.ViewBox()
v6 = pg.ViewBox()
# main view
pw = pg.GraphicsView()
pw.setWindowTitle('pyqtgraph example: multiple y-axis')
pw.show()
# layout
l = pg.GraphicsLayout()
pw.setCentralWidget(l)
# add axis to layout
## watch the col parameter here for the position
l.addItem(a2, row=1, col=5, rowspan=1, colspan=1)
l.addItem(a3, row=1, col=4, rowspan=1, colspan=1)
l.addItem(a4, row=1, col=3, rowspan=1, colspan=1)
l.addItem(a5, row=1, col=2, rowspan=1, colspan=1)
l.addItem(a6, row=1, col=1, rowspan=1, colspan=1)
# Blank axis used for aligning things
ax = pg.AxisItem(orientation='bottom')
ax.setPen('#000000')
pos = (2,2)
l.addItem(ax, *pos)
# plotitem and viewbox
## at least one plotitem is used whioch holds its own viewbox and left axis
pI = pg.PlotItem()
v1 = pI.vb # reference to viewbox of the plotitem
l.addItem(pI, row=1, col=8, rowspan=2, colspan=1) # add plotitem to layout
# split off 1st axis and put to side
pI.axis_left = pI.getAxis('left')
pos = (1,7)
l.addItem(pI.axis_left, *pos)
# add viewboxes to layout
l.scene().addItem(v2)
l.scene().addItem(v3)
l.scene().addItem(v4)
l.scene().addItem(v5)
l.scene().addItem(v6)
# link axis with viewboxes
a2.linkToView(v2)
a3.linkToView(v3)
a4.linkToView(v4)
a5.linkToView(v5)
a6.linkToView(v6)
# link viewboxes
v2.setXLink(v1)
v3.setXLink(v2)
v4.setXLink(v3)
v5.setXLink(v4)
v6.setXLink(v5)
# axes labels
pI.getAxis("left").setLabel('axis 1 in ViewBox of PlotItem', color='#FFFFFF')
a2.setLabel('axis 2 in Viewbox 2', color='#2E2EFE')
a3.setLabel('axis 3 in Viewbox 3', color='#2EFEF7')
a4.setLabel('axis 4 in Viewbox 4', color='#2EFE2E')
a5.setLabel('axis 5 in Viewbox 5', color='#FFFF00')
a6.setLabel('axis 6 in Viewbox 6', color='#FE2E64')
# slot: update view when resized
def updateViews():
v2.setGeometry(v1.sceneBoundingRect())
v3.setGeometry(v1.sceneBoundingRect())
v4.setGeometry(v1.sceneBoundingRect())
v5.setGeometry(v1.sceneBoundingRect())
v6.setGeometry(v1.sceneBoundingRect())
# data
x = [1, 2, 3, 4, 5, 6]
y1 = [0, 4, 6, 8, 10, 4]
y2 = [0, 5, 7, 9, 11, 3]
y3 = [0, 1, 2, 3, 4, 12]
y4 = [0, 8, 0.3, 0.4, 2, 5]
y5 = [0, 1, 6, 4, 2, 1]
y6 = [0, 0.2, 0.3, 0.4, 0.5, 0.6]
# plot
v1.addItem(pg.PlotCurveItem(x, y1, pen='#FFFFFF'))
v2.addItem(pg.PlotCurveItem(x, y2, pen='#2E2EFE'))
v3.addItem(pg.PlotCurveItem(x, y3, pen='#2EFEF7'))
v4.addItem(pg.PlotCurveItem(x, y4, pen='#2EFE2E'))
v5.addItem(pg.PlotCurveItem(x, y5, pen='#FFFF00'))
v6.addItem(pg.PlotCurveItem(x, y6, pen='#FE2E64'))
# updates when resized
v1.sigResized.connect(updateViews)
# autorange once to fit views at start
v2.enableAutoRange(axis=pg.ViewBox.XYAxes, enable=True)
v3.enableAutoRange(axis=pg.ViewBox.XYAxes, enable=True)
v4.enableAutoRange(axis=pg.ViewBox.XYAxes, enable=True)
v5.enableAutoRange(axis=pg.ViewBox.XYAxes, enable=True)
v6.enableAutoRange(axis=pg.ViewBox.XYAxes, enable=True)
updateViews()
if __name__ == '__main__':
import sys
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
QtGui.QApplication.instance().exec_()
希望对以后遇到同样问题的人有所帮助