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