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from .GraphicsObject import *
import pyqtgraph.functions as fn
from pyqtgraph.Qt import QtGui, QtCore
class IsocurveItem(GraphicsObject):
"""
**Bases:** :class:`GraphicsObject <pyqtgraph.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=None, level=0, pen='w'):
"""
Create a new isocurve item.
============= ===============================================================
**Arguments**
data A 2-dimensional ndarray. Can be initialized as None, and set
later using :func:`setData <pyqtgraph.IsocurveItem.setData>`
level The cutoff value at which to draw the isocurve.
pen The color of the curve item. Can be anything valid for
:func:`mkPen <pyqtgraph.mkPen>`
============= ===============================================================
"""
GraphicsObject.__init__(self)
self.level = level
self.data = None
self.path = None
self.setPen(pen)
self.setData(data, level)
#if data is not None and level is not None:
#self.updateLines(data, level)
def setData(self, data, level=None):
"""
Set the data/image to draw isocurves for.
============= ========================================================================
**Arguments**
data A 2-dimensional ndarray.
level The cutoff value at which to draw the curve. If level is not specified,
the previously set level is used.
============= ========================================================================
"""
if level is None:
level = self.level
self.level = level
self.data = data
self.path = None
self.prepareGeometryChange()
self.update()
def setLevel(self, level):
"""Set the level at which the isocurve is drawn."""
self.level = level
self.path = None
self.update()
def setPen(self, *args, **kwargs):
"""Set the pen used to draw the isocurve. Arguments can be any that are valid
for :func:`mkPen <pyqtgraph.mkPen>`"""
self.pen = fn.mkPen(*args, **kwargs)
self.update()
def setBrush(self, *args, **kwargs):
"""Set the brush used to draw the isocurve. Arguments can be any that are valid
for :func:`mkBrush <pyqtgraph.mkBrush>`"""
self.brush = fn.mkBrush(*args, **kwargs)
self.update()
def updateLines(self, data, level):
##print "data:", data
##print "level", level
#lines = fn.isocurve(data, level)
##print len(lines)
#self.path = QtGui.QPainterPath()
#for line in lines:
#self.path.moveTo(*line[0])
#self.path.lineTo(*line[1])
#self.update()
self.setData(data, level)
def boundingRect(self):
if self.data is None:
return QtCore.QRectF()
if self.path is None:
self.generatePath()
return self.path.boundingRect()
def generatePath(self):
if self.data is None:
self.path = None
return
lines = fn.isocurve(self.data, self.level, connected=True, extendToEdge=True)
self.path = QtGui.QPainterPath()
for line in lines:
self.path.moveTo(*line[0])
for p in line[1:]:
self.path.lineTo(*p)
def paint(self, p, *args):
if self.data is None:
return
if self.path is None:
self.generatePath()
p.setPen(self.pen)
p.drawPath(self.path)
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