pyqtgraph/graphicsItems/IsocurveItem.py

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from GraphicsObject import *
import pyqtgraph.functions as fn
from pyqtgraph.Qt import QtGui
class IsocurveItem(GraphicsObject):
"""
Item displaying an isocurve of a 2D array.
To align this item correctly with an ImageItem,
call isocurve.setParentItem(image)
"""
def __init__(self, data, level, pen='w'):
GraphicsObject.__init__(self)
lines = fn.isocurve(data, level)
self.path = QtGui.QPainterPath()
self.setPen(pen)
for line in lines:
self.path.moveTo(*line[0])
self.path.lineTo(*line[1])
def setPen(self, *args, **kwargs):
self.pen = fn.mkPen(*args, **kwargs)
self.update()
def boundingRect(self):
return self.path.boundingRect()
def paint(self, p, *args):
p.setPen(self.pen)
p.drawPath(self.path)