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')
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')
p1.hideAxis('right')
p3 = pg.ViewBox()
ax3 = pg.AxisItem('right')
p1.layout.addItem(ax3,2,3)
p1.scene().addItem(p3)
ax3.hide()
p4 = pg.ViewBox()
ax4 = pg.AxisItem('right')
ax4.hide()
p1.layout.addItem(ax4, 2, 1)
p1.scene().addItem(p4)
ax3.linkToView(p3)
p3.setXLink(p1)
ax3.setZValue(-10000)
ax3.setLabel('axis 3', color='#ff0000')
ax4.linkToView(p4)
p4.setXLink(p1)
ax4.setZValue(-10000)
ax4.setLabel('axis 4', color='#ff5555')
def updateViews():
global p1, p2, p3, p4
p2.setGeometry(p1.vb.sceneBoundingRect())
p3.setGeometry(p1.vb.sceneBoundingRect())
p4.setGeometry(p1.vb.sceneBoundingRect())
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([10,20,40,80,40,20], pen='b'))
p3.addItem(pg.PlotCurveItem([3200,1600,800,400,200,100], pen='r'))
if name == 'main':
import sys
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQTVERSION'):
QtGui.QApplication.instance().exec()
提问点:
1.p2.linkedViewChanged(p1.vb, p2.XAxis):此行代码有什么作用?
2.p1.scene().addItem(p2):为什么有时候要p1.scene()才能调addItem(),有时候直接用p1调用addItem(),而上面代码如果p1.addItem(p2),p2是显示不回来的?为什么?
3.linkToView():此函数的作用
4.setXLink():此函数的作用
5.p2.addItem(pg.PlotCurveItem([10,20,40,80,40,20], pen='b')) 为什么不传x,y轴坐标,而你们绘制的曲线图传了x,y。这里直接传了个列表。