/usr/lib/python2.7/dist-packages/pyqtgraph/examples/CustomGraphItem.py is in python-pyqtgraph 0.9.10-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 | # -*- coding: utf-8 -*-
"""
Simple example of subclassing GraphItem.
"""
import initExample ## Add path to library (just for examples; you do not need this)
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui
import numpy as np
# Enable antialiasing for prettier plots
pg.setConfigOptions(antialias=True)
w = pg.GraphicsWindow()
w.setWindowTitle('pyqtgraph example: CustomGraphItem')
v = w.addViewBox()
v.setAspectLocked()
class Graph(pg.GraphItem):
def __init__(self):
self.dragPoint = None
self.dragOffset = None
self.textItems = []
pg.GraphItem.__init__(self)
self.scatter.sigClicked.connect(self.clicked)
def setData(self, **kwds):
self.text = kwds.pop('text', [])
self.data = kwds
if 'pos' in self.data:
npts = self.data['pos'].shape[0]
self.data['data'] = np.empty(npts, dtype=[('index', int)])
self.data['data']['index'] = np.arange(npts)
self.setTexts(self.text)
self.updateGraph()
def setTexts(self, text):
for i in self.textItems:
i.scene().removeItem(i)
self.textItems = []
for t in text:
item = pg.TextItem(t)
self.textItems.append(item)
item.setParentItem(self)
def updateGraph(self):
pg.GraphItem.setData(self, **self.data)
for i,item in enumerate(self.textItems):
item.setPos(*self.data['pos'][i])
def mouseDragEvent(self, ev):
if ev.button() != QtCore.Qt.LeftButton:
ev.ignore()
return
if ev.isStart():
# We are already one step into the drag.
# Find the point(s) at the mouse cursor when the button was first
# pressed:
pos = ev.buttonDownPos()
pts = self.scatter.pointsAt(pos)
if len(pts) == 0:
ev.ignore()
return
self.dragPoint = pts[0]
ind = pts[0].data()[0]
self.dragOffset = self.data['pos'][ind] - pos
elif ev.isFinish():
self.dragPoint = None
return
else:
if self.dragPoint is None:
ev.ignore()
return
ind = self.dragPoint.data()[0]
self.data['pos'][ind] = ev.pos() + self.dragOffset
self.updateGraph()
ev.accept()
def clicked(self, pts):
print("clicked: %s" % pts)
g = Graph()
v.addItem(g)
## Define positions of nodes
pos = np.array([
[0,0],
[10,0],
[0,10],
[10,10],
[5,5],
[15,5]
], dtype=float)
## Define the set of connections in the graph
adj = np.array([
[0,1],
[1,3],
[3,2],
[2,0],
[1,5],
[3,5],
])
## Define the symbol to use for each node (this is optional)
symbols = ['o','o','o','o','t','+']
## Define the line style for each connection (this is optional)
lines = np.array([
(255,0,0,255,1),
(255,0,255,255,2),
(255,0,255,255,3),
(255,255,0,255,2),
(255,0,0,255,1),
(255,255,255,255,4),
], dtype=[('red',np.ubyte),('green',np.ubyte),('blue',np.ubyte),('alpha',np.ubyte),('width',float)])
## Define text to show next to each symbol
texts = ["Point %d" % i for i in range(6)]
## Update the graph
g.setData(pos=pos, adj=adj, pen=lines, size=1, symbol=symbols, pxMode=False, text=texts)
## 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_()
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