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