105 lines
3.2 KiB
Python
105 lines
3.2 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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__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'):
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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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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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#class ScaleBar(UIGraphicsItem):
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#"""
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#Displays a rectangular bar with 10 divisions to indicate the relative scale of objects on the view.
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#"""
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#def __init__(self, size, width=5, color=(100, 100, 255)):
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#UIGraphicsItem.__init__(self)
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#self.setAcceptedMouseButtons(QtCore.Qt.NoButton)
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#self.brush = fn.mkBrush(color)
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#self.pen = fn.mkPen((0,0,0))
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#self._width = width
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#self.size = size
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#def paint(self, p, opt, widget):
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#UIGraphicsItem.paint(self, p, opt, widget)
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#rect = self.boundingRect()
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#unit = self.pixelSize()
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#y = rect.top() + (rect.bottom()-rect.top()) * 0.02
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#y1 = y + unit[1]*self._width
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#x = rect.right() + (rect.left()-rect.right()) * 0.02
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#x1 = x - self.size
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#p.setPen(self.pen)
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#p.setBrush(self.brush)
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#rect = QtCore.QRectF(
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#QtCore.QPointF(x1, y1),
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#QtCore.QPointF(x, y)
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#)
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#p.translate(x1, y1)
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#p.scale(rect.width(), rect.height())
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#p.drawRect(0, 0, 1, 1)
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#alpha = np.clip(((self.size/unit[0]) - 40.) * 255. / 80., 0, 255)
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#p.setPen(QtGui.QPen(QtGui.QColor(0, 0, 0, alpha)))
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#for i in range(1, 10):
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##x2 = x + (x1-x) * 0.1 * i
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#x2 = 0.1 * i
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#p.drawLine(QtCore.QPointF(x2, 0), QtCore.QPointF(x2, 1))
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#def setSize(self, s):
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#self.size = s
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