pyqtgraph/graphicsItems/GraphItem.py

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from .. import functions as fn
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from .GraphicsObject import GraphicsObject
from .ScatterPlotItem import ScatterPlotItem
import pyqtgraph as pg
import numpy as np
__all__ = ['GraphItem']
class GraphItem(GraphicsObject):
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"""A GraphItem displays graph information as
a set of nodes connected by lines (as in 'graph theory', not 'graphics').
Useful for drawing networks, trees, etc.
"""
def __init__(self, **kwds):
GraphicsObject.__init__(self)
self.scatter = ScatterPlotItem()
self.scatter.setParentItem(self)
self.adjacency = None
self.pos = None
self.picture = None
self.pen = 'default'
self.setData(**kwds)
def setData(self, **kwds):
"""
Change the data displayed by the graph.
============ =========================================================
Arguments
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pos (N,2) array of the positions of each node in the graph.
adj (M,2) array of connection data. Each row contains indexes
of two nodes that are connected.
pen The pen to use when drawing lines between connected
nodes. May be one of:
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* QPen
* a single argument to pass to pg.mkPen
* a record array of length M
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with fields (red, green, blue, alpha, width). Note
that using this option may have a significant performance
cost.
* None (to disable connection drawing)
* 'default' to use the default foreground color.
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symbolPen The pen used for drawing nodes.
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``**opts`` All other keyword arguments are given to
:func:`ScatterPlotItem.setData() <pyqtgraph.ScatterPlotItem.setData>`
to affect the appearance of nodes (symbol, size, brush,
etc.)
============ =========================================================
"""
if 'adj' in kwds:
self.adjacency = kwds.pop('adj')
assert self.adjacency.dtype.kind in 'iu'
self.picture = None
if 'pos' in kwds:
self.pos = kwds['pos']
self.picture = None
if 'pen' in kwds:
self.setPen(kwds.pop('pen'))
self.picture = None
if 'symbolPen' in kwds:
kwds['pen'] = kwds.pop('symbolPen')
self.scatter.setData(**kwds)
self.informViewBoundsChanged()
def setPen(self, pen):
self.pen = pen
self.picture = None
def generatePicture(self):
self.picture = pg.QtGui.QPicture()
if self.pen is None or self.pos is None or self.adjacency is None:
return
p = pg.QtGui.QPainter(self.picture)
try:
pts = self.pos[self.adjacency]
pen = self.pen
if isinstance(pen, np.ndarray):
lastPen = None
for i in range(pts.shape[0]):
pen = self.pen[i]
if np.any(pen != lastPen):
lastPen = pen
if pen.dtype.fields is None:
p.setPen(pg.mkPen(color=(pen[0], pen[1], pen[2], pen[3]), width=1))
else:
p.setPen(pg.mkPen(color=(pen['red'], pen['green'], pen['blue'], pen['alpha']), width=pen['width']))
p.drawLine(pg.QtCore.QPointF(*pts[i][0]), pg.QtCore.QPointF(*pts[i][1]))
else:
if pen == 'default':
pen = pg.getConfigOption('foreground')
p.setPen(pg.mkPen(pen))
pts = pts.reshape((pts.shape[0]*pts.shape[1], pts.shape[2]))
path = fn.arrayToQPath(x=pts[:,0], y=pts[:,1], connect='pairs')
p.drawPath(path)
finally:
p.end()
def paint(self, p, *args):
if self.picture == None:
self.generatePicture()
self.picture.play(p)
def boundingRect(self):
return self.scatter.boundingRect()