I don't really like the PyQtGraph legend because it's inflexible. ~~ You should not have been able to change the background color etc. ~~ ↑ You pointed out in the comments. It is possible to change the background color itself by modifying the library (pyqtgraph \ graphicsItems \ LegendItem.py). See the comments section for details.
import sys
from PySide.QtCore import *
from PySide.QtGui import *
import pyqtgraph as pg
class GraphWindow(QMainWindow):
def __init__(self, parent = None):
super(GraphWindow, self).__init__(parent)
pw = pg.PlotWidget(viewBox = pg.ViewBox(border = pg.mkPen(color='#000000'),
invertX = False, invertY = False))
self.setCentralWidget(pw)
pw.setBackground("#FFFFFF00")
pw.setMinimumSize(500, 400)
pw.setMaximumSize(500, 400)
p1 = pw.plotItem
p2 = pg.ViewBox()
p3 = pg.ViewBox()
ax3 = pg.AxisItem(orientation = 'right')
self.setGraphFrameFont(p1, p2, p3, ax3)
self.setGraphMultipleAxis(p1, p2, p3, ax3)
p1.setLabels(bottom = "X Axis",
left = "Y1 Axis",
right = "Y2 Axis")
ax3.setLabel("Y3 Axis")
fontCss = {'font-family': "Times New Roman,Meiryo", 'font-size': '10.5pt', "color": "black"}
p1.getAxis('bottom').setLabel(**fontCss)
fontCss["color"] = "red"
p1.getAxis('left').setLabel(**fontCss)
fontCss["color"] = "blue"
p1.getAxis('right').setLabel(**fontCss)
fontCss["color"] = "green"
ax3.setLabel(**fontCss)
p1.setRange(xRange = (-2, 6), yRange = (-2, 6), padding = 0)
p2.setRange(yRange = (-1, 5), padding = 0)
p3.setRange(yRange = (0, 4), padding = 0)
p1.getAxis('bottom').setTickSpacing(major = 2.5, minor = 1)
p1.getAxis('left').setTickSpacing(major = 2.5, minor = 1)
p1.getAxis('right').setTickSpacing(major = 2.5, minor = 1)
ax3.setTickSpacing(major = 2.5, minor = 1)
p1.addItem(pg.PlotCurveItem(x = [0, 1, 2, 3 ,4],
y = [0, 1, 2, 3 ,4],
pen = pg.mkPen(color = "r", style = Qt.SolidLine),
name = "plot1",
antialias = True))
p2.addItem(pg.ScatterPlotItem(x = [0, 1, 2, 3 ,4],
y = [4, 3, 2, 1, 0],
symbol = "x",
pen = pg.mkPen(None),
name = "plot2",
brush = pg.mkBrush("b"),
size = 7.5,
antialias = True))
p3.addItem(pg.PlotCurveItem(x = [0, 1, 2, 3 ,4],
y = [0, 4, 0, 4, 0],
pen = pg.mkPen(color = "g", style = Qt.DashLine),
name = "plot3",
antialias = True))
##6 Set and display the legend
legend = p1.addLegend(offset = (10, 10))
fontCssLegend = '<style type="text/css"> p {font-family: Times New Roman,Meiryo; font-size: 10.5pt; color: "#000000"} </style>'
legend.addItem(pg.PlotCurveItem(pen = pg.mkPen(color = "r", style = Qt.SolidLine), antialias = True),
name = fontCssLegend + '<p>plot1 (Plot 1)</p>')
legend.addItem(pg.ScatterPlotItem(symbol = "x", pen = pg.mkPen(None), brush = pg.mkBrush("b"), size = 7.5, antialias = True),
name = fontCssLegend + '<p>plot2 (Plot 2)</p>')
legend.addItem(pg.PlotCurveItem(pen = pg.mkPen(color = "g", style = Qt.DashLine), antialias = True),
name = fontCssLegend + '<p>plot3 (Plot 3)</p>')
def setGraphFrameFont(self, p1, p2 = None, p3 = None, ax3 = None):
font = QFont("Times New Roman", 7)
p1.getAxis('bottom').setPen(pg.mkPen(color='#000000'))
p1.getAxis('left').setPen(pg.mkPen(color='#000000'))
p1.getAxis('bottom').setHeight(3.5 * 10.5)
p1.getAxis('left').setWidth(4 * 10.5)
#p1.getAxis('bottom').setLabel(**self.fontCss)
p1.getAxis('bottom').tickFont = font
#p1.getAxis('left').setLabel(**self.fontCss)
p1.getAxis('left').tickFont = font
if p2 != None:
p1.getAxis('right').setPen(pg.mkPen(color='#000000'))
p1.getAxis('right').setWidth(4 * 10.5)
#p1.getAxis('right').setLabel(**self.fontCss)
p1.getAxis('right').tickFont = font
if p3 != None and ax3 != None:
ax3.setPen(pg.mkPen(color='#000000'))
ax3.setWidth(4 * 10.5)
#ax3.setLabel(**self.fontCss)
ax3.tickFont = font
def setGraphMultipleAxis(self, p1, p2, p3 = None, ax3 = None):
p1.showAxis('right')
p1.scene().addItem(p2)
p1.getAxis('right').linkToView(p2)
p2.setXLink(p1)
p2.sigRangeChanged.connect(lambda: p2.setGeometry(p1.vb.sceneBoundingRect()))
if p3 != None and ax3 != None:
spacer = QGraphicsWidget()
spacer.setMaximumSize(15,15)
p1.layout.addItem(spacer, 2, 3)
p1.layout.addItem(ax3, 2, 4)
p1.scene().addItem(p3)
ax3.linkToView(p3)
p3.setXLink(p1)
p3.sigRangeChanged.connect(lambda: p3.setGeometry(p1.vb.sceneBoundingRect()))
if __name__ == '__main__':
#Create a Qt Application
app = QApplication(sys.argv)
#Create and display form
mainWin = GraphWindow()
mainWin.show()
#Start the main loop of Qt
sys.exit(app.exec_())
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