pyqtgraph:为散点图添加图例项

Question

我正在使用 pyqtgraph，我想在散点图的图例中添加一个项目。

我改编了示例代码来演示:

# -*- coding: utf-8 -*-
"""
Demonstrates basic use of LegendItem

"""
import initExample ## Add path to library (just for examples; you do not need this)

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

plt = pg.plot()
plt.setWindowTitle('pyqtgraph example: Legend')
plt.addLegend()

c1 = plt.plot([1,3,2,4], pen='r', name='red plot')
c2 = plt.plot([2,1,4,3], pen='g', fillLevel=0, fillBrush=(255,255,255,30), name='green plot')
c3 = plt.plot([4,3,2,1], pen=None, symbol='o', symbolPen='y', symbolBrush='r', name="point plot")


## 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_()

我得到的结果是:

如何添加适当的图例项？

Answer 1

当前版本的 pyqtgraph 不支持此功能。但是，它在 unstable 分支中受支持。您可以从此处的不稳定分支复制 LegendItem.py:http://bazaar.launchpad.net/~luke-campagnola/pyqtgraph/inp/view/head:/pyqtgraph/graphicsItems/LegendItem.py