134 lines
3.4 KiB
Python
134 lines
3.4 KiB
Python
# -*- coding: utf-8 -*-
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"""
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Simple example of subclassing GraphItem.
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"""
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import initExample ## Add path to library (just for examples; you do not need this)
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import pyqtgraph as pg
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from pyqtgraph.Qt import QtCore, QtGui
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import numpy as np
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# Enable antialiasing for prettier plots
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pg.setConfigOptions(antialias=True)
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w = pg.GraphicsLayoutWidget(show=True)
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w.setWindowTitle('pyqtgraph example: CustomGraphItem')
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v = w.addViewBox()
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v.setAspectLocked()
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class Graph(pg.GraphItem):
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def __init__(self):
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self.dragPoint = None
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self.dragOffset = None
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self.textItems = []
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pg.GraphItem.__init__(self)
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self.scatter.sigClicked.connect(self.clicked)
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def setData(self, **kwds):
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self.text = kwds.pop('text', [])
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self.data = kwds
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if 'pos' in self.data:
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npts = self.data['pos'].shape[0]
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self.data['data'] = np.empty(npts, dtype=[('index', int)])
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self.data['data']['index'] = np.arange(npts)
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self.setTexts(self.text)
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self.updateGraph()
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def setTexts(self, text):
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for i in self.textItems:
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i.scene().removeItem(i)
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self.textItems = []
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for t in text:
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item = pg.TextItem(t)
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self.textItems.append(item)
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item.setParentItem(self)
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def updateGraph(self):
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pg.GraphItem.setData(self, **self.data)
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for i,item in enumerate(self.textItems):
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item.setPos(*self.data['pos'][i])
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def mouseDragEvent(self, ev):
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if ev.button() != QtCore.Qt.MouseButton.LeftButton:
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ev.ignore()
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return
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if ev.isStart():
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# We are already one step into the drag.
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# Find the point(s) at the mouse cursor when the button was first
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# pressed:
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pos = ev.buttonDownPos()
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pts = self.scatter.pointsAt(pos)
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if len(pts) == 0:
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ev.ignore()
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return
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self.dragPoint = pts[0]
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ind = pts[0].data()[0]
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self.dragOffset = self.data['pos'][ind] - pos
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elif ev.isFinish():
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self.dragPoint = None
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return
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else:
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if self.dragPoint is None:
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ev.ignore()
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return
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ind = self.dragPoint.data()[0]
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self.data['pos'][ind] = ev.pos() + self.dragOffset
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self.updateGraph()
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ev.accept()
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def clicked(self, pts):
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print("clicked: %s" % pts)
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g = Graph()
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v.addItem(g)
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## Define positions of nodes
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pos = np.array([
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[0,0],
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[10,0],
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[0,10],
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[10,10],
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[5,5],
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[15,5]
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], dtype=float)
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## Define the set of connections in the graph
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adj = np.array([
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[0,1],
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[1,3],
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[3,2],
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[2,0],
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[1,5],
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[3,5],
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])
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## Define the symbol to use for each node (this is optional)
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symbols = ['o','o','o','o','t','+']
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## Define the line style for each connection (this is optional)
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lines = np.array([
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(255,0,0,255,1),
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(255,0,255,255,2),
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(255,0,255,255,3),
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(255,255,0,255,2),
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(255,0,0,255,1),
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(255,255,255,255,4),
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], dtype=[('red',np.ubyte),('green',np.ubyte),('blue',np.ubyte),('alpha',np.ubyte),('width',float)])
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## Define text to show next to each symbol
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texts = ["Point %d" % i for i in range(6)]
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## Update the graph
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g.setData(pos=pos, adj=adj, pen=lines, size=1, symbol=symbols, pxMode=False, text=texts)
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if __name__ == '__main__':
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pg.exec()
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