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I am using this class to draw a trace, I've got 2 lines to trace, but I cannot display name of each line, how to?

class Plot2D():
 def __init__(self):
 self.traces = dict()

 #QtGui.QApplication.setGraphicsSystem('raster')
 self.app = QtGui.QApplication()
 #mw = QtGui.QMainWindow()
 #mw.resize(800,800)

 self.win = pg.GraphicsWindow(title="Detecting cluck")
 self.win.resize(1000,600)
 self.win.setWindowTitle('Detecting')
 # Enable antialiasing for prettier plots
 pg.setConfigOptions(antialias=True)

 self.canvas = self.win.addPlot(title="改装车检测")
 self.canvas.setYRange(0, 1)

 def start(self):
 if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
 QtGui.QApplication.instance().exec_()

 def trace(self,name,dataset_x,dataset_y,sColor):
 if name in self.traces:
 self.traces[name].setData(dataset_x,dataset_y)
 else:
 self.traces[name] = self.canvas.plot(
 pen=pg.mkPen(sColor, width=3), name="car")

what I got:

what I got

what I want:

You must use addLegend(), in addition to establishing a name in the plot:

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

class Plot2D():
 def __init__(self):
 self.traces = dict()

 self.app = QtGui.QApplication()

 self.win = pg.GraphicsWindow(title="Detecting")
 self.win.resize(1000,600)
 pg.setConfigOptions(antialias=True)

 self.canvas = self.win.addPlot(title="改装车检测")
 self.canvas.addLegend()
 self.canvas.setYRange(0, 1)

 def start(self):
 if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
 QtGui.QApplication.instance().exec_()

 def trace(self,name,dataset_x,dataset_y,sColor):
 if name in self.traces:
 self.traces[name].setData(dataset_x,dataset_y)
 else:
 self.traces[name] = self.canvas.plot(dataset_x, dataset_y,
 pen=pg.mkPen(sColor, width=3), name=name)

if __name__ == '__main__':
 p = Plot2D()
 p.trace("name1", range(100), 0.5 + np.random.normal(size=100, scale=0.1), 'r')
 p.trace("name2", range(100), 0.5 + np.random.normal(size=100, scale=0.1), 'w')
 p.start()

Update:

If you want to change the font size you can use HTML

self.traces[name] = self.canvas.plot(dataset_x, dataset_y,
 pen=pg.mkPen(sColor, width=3), name='''<font size="15"></font>'''.format(name))