72 lines
2.2 KiB
Python
72 lines
2.2 KiB
Python
from ..Qt import QtGui, QtCore
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from .GraphicsObject import *
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from .GraphicsWidgetAnchor import *
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from .TextItem import TextItem
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import numpy as np
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from .. import functions as fn
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from .. import getConfigOption
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from ..Point import Point
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__all__ = ['ScaleBar']
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class ScaleBar(GraphicsObject, GraphicsWidgetAnchor):
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"""
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Displays a rectangular bar to indicate the relative scale of objects on the view.
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"""
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def __init__(self, size, width=5, brush=None, pen=None, suffix='m', offset=None):
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GraphicsObject.__init__(self)
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GraphicsWidgetAnchor.__init__(self)
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self.setFlag(self.ItemHasNoContents)
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self.setAcceptedMouseButtons(QtCore.Qt.NoButton)
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if brush is None:
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brush = getConfigOption('foreground')
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self.brush = fn.mkBrush(brush)
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self.pen = fn.mkPen(pen)
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self._width = width
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self.size = size
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if offset == None:
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offset = (0,0)
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self.offset = offset
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self.bar = QtGui.QGraphicsRectItem()
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self.bar.setPen(self.pen)
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self.bar.setBrush(self.brush)
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self.bar.setParentItem(self)
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self.text = TextItem(text=fn.siFormat(size, suffix=suffix), anchor=(0.5,1))
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self.text.setParentItem(self)
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def parentChanged(self):
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view = self.parentItem()
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if view is None:
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return
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view.sigRangeChanged.connect(self.updateBar)
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self.updateBar()
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def updateBar(self):
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view = self.parentItem()
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if view is None:
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return
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p1 = view.mapFromViewToItem(self, QtCore.QPointF(0,0))
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p2 = view.mapFromViewToItem(self, QtCore.QPointF(self.size,0))
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w = (p2-p1).x()
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self.bar.setRect(QtCore.QRectF(-w, 0, w, self._width))
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self.text.setPos(-w/2., 0)
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def boundingRect(self):
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return QtCore.QRectF()
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def setParentItem(self, p):
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ret = GraphicsObject.setParentItem(self, p)
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if self.offset is not None:
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offset = Point(self.offset)
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anchorx = 1 if offset[0] <= 0 else 0
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anchory = 1 if offset[1] <= 0 else 0
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anchor = (anchorx, anchory)
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self.anchor(itemPos=anchor, parentPos=anchor, offset=offset)
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return ret
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