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Update Legend.py

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add legend examples for line plot, bar graph and scatter plot.
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MingZZZZZZZZ 2018-12-21 01:47:23 -05:00 committed by GitHub
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1 changed files with 29 additions and 9 deletions
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examples/Legend.py
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@ -7,17 +7,37 @@ import initExample ## Add path to library (just for examples; you do not need th
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui
import numpy as np
plt = pg.plot()
plt.setWindowTitle('pyqtgraph example: Legend')
plt.addLegend()
#l = pg.LegendItem((100,60), offset=(70,30)) # args are (size, offset)
#l.setParentItem(plt.graphicsItem()) # Note we do NOT call plt.addItem in this case
win = pg.plot()
win.setWindowTitle('pyqtgraph example: BarGraphItem')
c1 = plt.plot([1,3,2,4], pen='r', symbol='o', symbolPen='r', symbolBrush=0.5, name='red plot')
c2 = plt.plot([2,1,4,3], pen='g', fillLevel=0, fillBrush=(255,255,255,30), name='green plot')
#l.addItem(c1, 'red plot')
#l.addItem(c2, 'green plot')
# # option1: only for .plot(), following c1,c2 for example-----------------------
# win.addLegend()
# bar graph
x = np.arange(10)
y = np.sin(x+2) * 3
bg1 = pg.BarGraphItem(x=x, height=y, width=0.3, brush='b', pen='w', name='bar')
win.addItem(bg1)
# curve
c1 = win.plot([np.random.randint(0,8) for i in range(10)], pen='r', symbol='t', symbolPen='r', symbolBrush='g', name='curve1')
c2 = win.plot([2,1,4,3,1,3,2,4,3,2], pen='g', fillLevel=0, fillBrush=(255,255,255,30), name='curve2')
# scatter plot
s1 = pg.ScatterPlotItem(size=10, pen=pg.mkPen(None), brush=pg.mkBrush(255, 255, 255, 120), name='scatter')
spots = [{'pos': [i, np.random.randint(-3, 3)], 'data': 1} for i in range(10)]
s1.addPoints(spots)
win.addItem(s1)
# # option2: generic method------------------------------------------------
legend = pg.LegendItem((80,60), offset=(70,20))
legend.setParentItem(win.graphicsItem())
legend.addItem(bg1, 'bar')
legend.addItem(c1, 'curve1')
legend.addItem(c2, 'curve2')
legend.addItem(s1, 'scatter')
## Start Qt event loop unless running in interactive mode or using pyside.